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115results about How to "Exclude external interference" patented technology
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Method for measuring coal bunker material level based on laser and binocular vision and device thereof
InactiveCN101949721AHigh precisionImprove robustnessImage enhancementImage analysisCamera lensLight spot
The invention relates to a method for measuring coal bunker material level based on laser and binocular vision and a device thereof, belonging to the field of machine vision. The device comprises two CCD cameras with the same parameters, two lenses with consistent parameters, one or a plurality of lasers, a light source, a processing element and an explosion-proof case provided with a window. A rotating mechanism is also included when one laser is used. The method includes that the laser emits variable size laser beams, so as to form a light spot on coal surface, image parallax of the light spot between the two cameras is utilized to measure material level, and an image pair is acquired by the two cameras; corrosion expansion pre-treatment is carried out on the obtained images by utilizing an improved algorithm; for the two images after being pretreated, a new rapid stereoscopic vision algorithm is utilized to calculate a depth map; depth is obtained according to the depth map, and finally high efficiency, real time and accurate coal bunker material level measurement is realized. The device has two measuring modes, namely real-time detection mode and sensor detection mode.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
On site programmable gate array single particle effect test method
InactiveCN101458299ATest accurateEliminate external interferenceContactless circuit testingTest roomGate array
The invention provides a test method for field programmable gate array single particle effect, relating to an integrated circuit technology. The invention comprises the following steps: 1) the package of FPGA is removed, and FPGA is arranged on a test circuit board; 2) FPGA is configured, and then SRAM data are read back and recorded; 3) the test circuit board is arranged in a test room and a particle source emits single particles to bombard FPGA; 4) SRAM data are read back and recorded; 5) data of steps 2) and 4) are compared, and reversed digits of SRAM are determined; 6) when the reversal times reach a preset value or after the period of time without reversal reaches a preset time value, the particle source is changed, FPGA is electrified again, the FPGA is confirmed to return to the initial state, and then steps 3) and 5) are repeated; 7) the data are processed: the reversal section of the LET value is calculated and a reversal curve is generated. The method can precisely test the impact of the single particle effect and eliminate external interferences, thus ensuring the correction and reliability of the test results.
Owner:CHENGDU SINO MICROELECTRONICS TECH CO LTD
Non-contact photoelectric measurement method and device for bunker coal position
InactiveCN102023045ANo accumulationAccurate measurement dataMachines/enginesLevel indicatorsLaser transmitterMeasurement device
The invention provides a non-contact photoelectric measurement method and device, which obtains the depth value of materials in a bunker on the basis of the number of pixels between a laser facula imaging spot and an image center spot in an image, belonging to the technical field of material position measurement. The invention is especially suitable for measuring the depth of the bunker coal position. In the device of the invention, a digital camera and a laser emitter are fixed on the top of the principal axis of a barrel-shaped bunker, so that the light path of the camera is vertical to the surface of material. The laser emitter is arranged on the position at the angle theta with the horizontal direction so as to ensure that the imaging zone of the laser facula can be projected on the material surface within the field range of the camera. The camera focuses by N-gear segment so as to satisfy the situation that clear images can be shot on all different coal positions of the bunker. DSP (Digital Signal Processor) serves as the inner core of a processor. The number of pixels between the laser facula imaging spot and the image center spot is calculated, and a depth table which is calibrated in advance and corresponds to different pixel number mean values is inquired to finish depth detection. The measurement device is composed of the digital camera, the laser emitter, the image processor and a real-time display module.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Method and device for detecting leakage of shell type heat exchanger
InactiveCN101408466AImprove detection accuracyImprove detection efficiencyFluid-tightness measurement using fluid/vacuumPlate heat exchangerShell and tube heat exchanger
The invention relates to a detection method and a device thereof, in particular to a leak detection method for a shell-and-tube heat exchanger and a device thereof. The detection device comprises a helium mass spectrometer leak detector and a vacuum pump, and is characterized in that an air inlet tube is arranged on an air intake hood which is hermetically connected with one end of the shell-and-tube heat exchanger, an exhaust hood is hermetically arranged on the other end of the shell-and-tube heat exchanger and is equipped with an exhaust tube on the exhaust hood, a vacuum pump clearance tube is arranged on the outer shell of the shell-and-tube heat exchanger, and an air inlet of the helium mass spectrometer leak detector is communicated with the outlet of the vacuum pump. The detection device can lock the leak situations of all the detected shells and tubes in the air intake hood and the exhaust hood which are respectively arranged on the shell-and-tube heat exchanger at one time, and can accurately determine the leaking shells and tubes by replacing hoods of different specifications, thus greatly enhancing the detection efficiency and lightening the labor intensity. Meanwhile, the helium mass spectrometer leak detector is used, thus enhancing the detection precision of the device and eliminates the external interference.
Owner:宁夏电力科技教育工程院
SCARA robot trajectory tracking control method based on prediction indirect iterative learning
ActiveCN105773623AOvercoming repetitive unknown interferenceIterative convergence is fastProgramme-controlled manipulatorClosed loop feedbackClosed loop
The invention discloses an SCARA robot trajectory tracking control method based on prediction indirect iterative learning. Aiming at the problem that users are not allowed to compensate torque signals output by a servo drive of an alternating-current motor under most conditions in actual engineering, the SCARA robot trajectory tracking control method based on prediction indirect iterative learning is proposed. Firstly, a double-closed loop feedback controller directly acted on a robot body is designed, and includes a P type position closed loop and a PI type speed closed loop; and then, a prediction iterative learning controller (A-ILC) with a feedforward effect is designed, and a control effect at the sampling time t in next operation is adjusted by using error output information at the sampling time t+delta in previous operation batches. Compared with a proportional differential iterative learning controller (PD-ILC), the A-ILC is faster in iterative convergence speed and higher in tracking precision; and compared with an A-ILC without the feedforward effect, the A-ILC with the feedforward effect can eliminate external disturbance more quickly and effectively.
Owner:湖州度信科技有限公司
Fully optical fiber probe scan type near-field optical microscope
InactiveCN1587980AReduce noiseHigh sensitivitySurface/boundary effectMaterial analysis by optical meansFeedback controlNear field optical microscope
A complete optical probe scanning near field optical microscope is disclosed, comprising laser lighting system, monitoring system, sample support, light fiber probe scanning mechanism, three-dimensional rack and pinion adjustment, feedback control and data collecting system. Its basic idea that light fiber probe is fixed on tuning fork, through three -dimensional scanner, light fiber probe is made to scan on the surface of sample nearby, when light fiber probe is approaching the surface of sample, it will be influenced by effect of atom shearing force which will change concussion of tuning fork so that the information of distance between light fiber probe and sample can be obtained. The information is feedback to Z direction control system to make light fiber probe keep a distance to a constant value with surface of sample, whose appearance will be reflected by the information feedback, and light intensity collected by light fiber probe provides permeability of sample. The invention has the advantages of large scanning range, no limitation of sample, high modularization, convenient combination and change.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Connector
InactiveUS6905366B2Avoid mutual interferenceSimple structureTwo-part coupling devicesCoupling protective earth/shielding arrangementsElectrical and Electronics engineeringInsertion element
A connector includes a plastic core having upper and lower receiving slots, upper and lower rows of terminal slots, and isolating plate slots provided at a central portion, two slide ways provided at two lateral inner sides, and a connecting head provided at a front end thereof; a plurality of terminals located in the terminal slots; a plurality of isolating plates located in the isolating plate slots; two first conductive plates located in the upper and lower receiving slots; an insertion element having two lateral ends slidably engaged with the slide ways on the plastic core, and having a central receiving slot for receiving a second conductive plate therein; and two outer covers enclosing the insertion element in the plastic core, and having two third conductive plates received in receiving recesses provided thereon to contact with the first conductive plates.
Owner:ALL BEST ELECTRONICS
Method for in-situ synchronous acquisition of two-dimensional distribution of active phosphor and dissolved oxygen in water, soil or sediment
Owner:NANJING INST OF GEOGRAPHY & LIMNOLOGY
Automatic-tracking double paraboloids light-concentrating, power-generating and heating system
InactiveCN102082195AReduce external distractionsReduce manual maintenance workloadPhotovoltaic supportsMirrorsParaboloidHeating system
The invention discloses an automatic-tracking double paraboloids light-concentrating, power-generating and heating system, which comprises a big parabolic reflecting surface and a small parabolic reflecting surface. The concave surfaces of the two paraboloids are opposite to each other, and the normal axes are on a same straight line with focal points or focal lines superposed with each other. An infrared filter plate is arranged on or adjacent to the focal points of the two paraboloids; a photovoltaic electroplate is fixed on the bottom of the concave surface of the big parabolic reflecting surface; the photovoltaic electroplate is connected with a metal heat-conductive sheet; a cooling metal slim tube is attached to the metal heat-conductive sheet; the photovoltaic electroplate is connected with the rotating shafts of transverse direction and longitudinal direction via a mechanical supporting mechanism. A look-down detector is arranged in front of the small parabolic reflecting surface, and the spherical axis of the detector is parallel to the axis of the paraboloid; the look-down detector is connected with a controller which is connected with an actuating motor for controlling the rotation of transverse rotating shaft and the longitudinal rotating shaft. The system is reasonable in structure, solves the problems of much interference, low precision and poor stability of the existing sunlight tracking system, reduces detection error and improves tracking precision and stability.
Owner:NANTONG UNIVERSITY
RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages
ActiveCN102928511AEliminate external distractionsRealize accurate diagnosis and localizationAnalysing solids using sonic/ultrasonic/infrasonic wavesSensor arrayMechanical construction
The invention discloses an RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages. An RAPID chromatography algorithm based on partial imaging is established by providing a new sensor array form and taking the new sensor array form as a basis, the interference among different damages and the influence of an external interference source of a detected area are eliminated through data truncation and partial reconstruction in sub areas in the nondestructive identification of the mechanical structure damage, therefore, not only is the external interference eliminated, but also the accurate diagnosis and location of multiple damages or single damage are effectively achieved.
Owner:XI AN JIAOTONG UNIV
Image registration method based on feature points
PendingCN112150520AImprove matching accuracyExclude external interferenceImage enhancementImage analysisCosine similarityReference image
The invention discloses an image registration method based on feature points, and relates to the technical field of image registration. The method comprises the following steps: a, preprocessing a reference image and an image to be registered by adopting a wavelet transform threshold denoising method; b, extracting feature points by an SIFT algorithm; c, describing the feature points by adopting adeformation dimension reduction method; d, performing rough matching on the feature points according to cosine similarity; and e, eliminating part of mismatching by adopting an improved RANSAC algorithm to obtain a matching point pair with relatively high matching precision. Images are preprocessed by using a wavelet transform threshold denoising method before feature points are extracted, part of noise in the image is eliminated, so that the purity of the feature points is improved, a deformation dimension reduction method is provided for describing the extracted feature points when the feature points are described, SIFT descriptor dimensions are reduced, the algorithm operation time is shortened. The matched feature point pairs are optimized by adopting a method of combining rough matching and fine matching, so that the matching accuracy of the algorithm is improved.
Owner:徐州华讯科技有限公司
Method for detecting interference in long-term evolution system and equipment
ActiveCN102355681APrecise positioningNormal working conditionWireless communicationTime domainPower intensity
The invention discloses a method for detecting interference in a long-term evolution (LTE) system and equipment. The method comprises the following steps that: if a current community is in an uplink time slot, no user has accesses into the community and signals can be stilled received, the power of each RE in the packet receive buffers (PRBs) of a plurality of continuous uplink sub-frames is detected, wherein one PRB comprises a plurality of symbols in a time domain, and each symbol comprises a plurality of REs in a frequency domain; and if the power intensity of the REs is higher than the set intensity periodically on one symbol, the interference of the current community by downlink transmission signals of an adjacent community is determined. Consequently, according to the invention, the sources and the causes of the outside interference an be quickly and accurately positioned when a base station is interfered by the outside environment, so that the interference detection efficiency is improved.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Apparatus for simple detection of infrared imaging system performance parameter
InactiveCN101504317AThe detection environment and detection space requirements are reducedGuaranteed temperature stabilityRadiation pyrometryOptical pathTesting equipment
The invention relates to a device for simply and conveniently detecting performance parameters of an infrared imaging system, which comprises an infrared lens, a hollowed metal target, a temperature control chip, a temperature sensor and a shell, and is characterized in that the shell is a heat-insulated metal sleeve; the temperature control chip is positioned at one end of the heat-insulated metal sleeve, and the infrared lens is positioned at the other end of the heat-insulated metal sleeve; the hollowed metal target is arranged near the focal surface of the infrared lens in the heat-insulated metal sleeve through a target supporting device; the temperature sensor is arranged on the hollowed metal target; and a hollowed part of the hollowed metal target is positioned on a light path between the temperature control chip and the infrared lens. The device utilizes the imaging principle to simulate a distant target, meets the requirement of the operating distance of a thermal infrared imager, guarantees the temperature stability due to the shell with good heat-insulating property, reduces the environmental requirements under the condition of detection, effectively eliminates external interferences such as air circulation, heat conduction, heat radiation and the like, and reduces the space size of the thermal imager under the condition of detection. Moreover, the whole detection device has small volume and is convenient to operate and quick to detect.
Owner:NAVAL UNIV OF ENG PLA
Connector
ActiveUS20050095912A1Avoid electromagnetic interferenceAvoid mutual interferenceTwo-part coupling devicesCoupling protective earth/shielding arrangementsEngineeringElectrical and Electronics engineering
A connector includes a plastic core having upper and lower receiving slots, upper and lower rows of terminal slots, and isolating plate slots provided at a central portion, two slide ways provided at two lateral inner sides, and a connecting head provided at a front end thereof; a plurality of terminals located in the terminal slots; a plurality of isolating plates located in the isolating plate slots; two first conductive plates located in the upper and lower receiving slots; an insertion element having two lateral ends slidably engaged with the slide ways on the plastic core, and having a central receiving slot for receiving a second conductive plate therein; and two outer covers enclosing the insertion element in the plastic core, and having two third conductive plates received in receiving recesses provided thereon to contact with the first conductive plates.
Owner:ALL BEST ELECTRONICS
Method and device for melt spinning and cooling a multifilament thread
InactiveCN101313090AIdentify and stop earlyAccurately Obtain Cooling CharacteristicsArtificial thread manufacturing machinesFilament/thread formingEngineeringPolymer melt
The invention relates to a method for melt spinning and cooling a multifilament thread and to a device for carrying out said method. According to said method, a plurality of filaments is extruded from a polymer melt, said filaments being guided in a filament bundle and cooled by a cooling air stream that passes transversally across the filament bundle, the temperature of the cooling air that is evacuated during the cooling of the filaments being measured and monitored. To detect the cooled state of the filaments and the characteristics of the thread derived from said state, the temperature of the cooling air is measured at least at one measuring point inside the filament bundle. To achieve this, a temperature sensor is located inside the filament bundle between the spinneret and a thread guide that is allocated to the latter.
Owner:OERLIKON TEXTILE GMBH & CO KG
Road traffic signal light control system based on GSM network
InactiveCN104933875AExclude external interferenceControlling traffic signalsControl systemRelease time
The invention relates to a road traffic signal light control system based on a GSM network. A laser correlation apparatus which is installed on each lane outflux of a crossroad measures the number of vehicles which pass through the lane outflux at green light. According to traffic data of the front crossroad, release time is calculated, simultaneously a distance between the vehicles during the release time is measured and a release traffic congestion condition is determined. The strong GSM network is used and communication among the crossroads is realized through a mode of sending short messages to each other.
Owner:张金木
Triboelectrification and electrostatic dissipation detection analysis device for space environment
ActiveCN108872726AReal-time acquisition of triboelectricityReal-time access to friction performanceElectrical measurementsElectricitySpace environment
The invention relates to the technical field of triboelectrification, and especially relates to a triboelectrification and electrostatic dissipation detection analysis device for a space environment.The device comprises a vacuum system, a cosmic ray radiation system, an alternating temperature system, a sliding friction and contact separation friction integrated drive unit, and an electrostatic detection system. The device can achieve the observation and analysis of the triboelectrification and electrostatic discharge parameters of a material in the space environment in real time, and has a higher application value for the selection and design of the triboelectrification and electrostatic discharge and electrostatic resistant materials of a spacecraft.
Owner:LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
Cleaning robot
PendingCN111466835APlay a protective effectSafe and stable jobAutomatic obstacle detectionTravelling automatic controlEngineeringComputer science
Owner:SHENZHEN SILVER STAR INTELLIGENT TECH CO LTD
Chip performance test method, device and system
ActiveCN107153158AImprove accuracyReduced cost of testingElectronic circuit testingClosed loopEngineering
The invention discloses a chip performance test method, device and system. The method comprises that when a test instruction to test a test chip is received, a signal generating unit generates a test signal of the specified type according to the test instruction and outputs the test signal, and a signal connection unit forms a closed loop of a signal receiving and processing unit to which the test signal is input by the opening and closing state of a switch assembly according to test content, and when the signal receiving and processing unit receives the test signal inputted from the closed loop, the test signal is processed to obtain result data, and the result data are compared with preset decision data to obtain a test result corresponding to the test content. The chip performance test can be achieved inside the chip to be tested, the accuracy of the test result is improved, and the test cost is lowered.
Owner:SHENZHEN GOODIX TECH CO LTD
Dynamic force sensor sensitivity calibration method and device
InactiveCN106595952AEliminate outside distractionsAchieve installation consistencyForce/torque/work measurement apparatus calibration/testingVoltageMeasurement precision
The invention discloses a dynamic force sensor sensitivity calibration method and device. The method comprises steps that silicone grease is filled between a calibration force sensor and a standard acceleration sensor fixing surface; M mass blocks are respectively arranged on a standard acceleration sensor for measurement, and the M is not smaller than 2, a vibrator is driven to generate vibration, output voltage signals of a standard acceleration gauge and a to-be-calibrated force sensor and acceleration detected by the standard acceleration gauge are acquired, and sensitivity of the to-be-calibrated force sensor is calculated according to the acquired signals. According to the method and the device, a fixing method of the to-be-calibrated force sensor and the standard acceleration sensor is realized, a specific dynamic calibration precision expression of the force sensor is acquired through derivation, no-suspension mounting requirement is proposed for the standard mass blocks, operation difficulty is reduced, and measurement precision and reliability are easily guaranteed.
Owner:HUBEI SANJIANG AEROSPACE HONGFENG CONTROL
Gamma radioactive source augmented reality method and system
ActiveCN107862747APrecise positioningReal-time processingDetails involving processing stepsX-ray spectral distribution measurementDose rateRadioactive waste
The invention discloses a gamma radioactive source augmented reality method and system, and mainly solves the problems existing in the prior art that accurate locating and tracking of the moving unknown radioactive source and real-time display of the radioactive source cannot be realized. The system comprises at least four scintillator detectors which are discretely distributed and configured in atwo-dimensional or three-dimensional space; a camera which is arranged at the edge of the space area and used for performing video image photographing of the space; an industrial control computer which is connected with the scintillator detectors and the camera and used for acquiring the counting rate and the energy spectrum detected by the scintillator detectors to realize nuclide identification, locating and surface dose rate calculation of the radioactive source; and a terminal machine which is connected with the industrial control computer and used for transformation of the three-dimensional locating coordinates and the two-dimensional video image coordinates, fusion of the radioactive source icon and the video image and storage and display of the video image and the radioactive source parameters. The gamma radioactive source augmented reality method and system have the advantages of accurate locating of the radioactive source, nuclide identification, surface dose rate calculation, continuous tracking and visual real-time image display.
Owner:MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
System and method for eliminating external interference based on omnidirectional UHF (Ultra High Frequency) noise sensor
InactiveCN106291279AExclude external interferenceTesting using acoustic measurementsOmni directionalRadome
The present invention provides a system and method for eliminating external interference based on an omnidirectional UHF (Ultra High Frequency) noise sensor. The system includes the omnidirectional UHF noise sensor which is used for receiving GIS external signals in an omni-directional manner, a signal sensor which is used for receiving the partial discharge signals of a GIS internal insulation defect, a partial discharge acquisition unit which is used for amplifying and converting the partial discharge signals and the GIS external signals, a host computer which judges the attribute of the GIS external signals according to judgment principles and performs processing when the GIS external signals are interference signals so as to eliminate the GIS external signals; and the omnidirectional UHF noise sensor comprises a conical helical antenna plate unit which is composed of a conical helical antenna and a bottom plate and is used for receiving the GIS external signals in an omni-directional manner, a fixture unit which is composed of an epoxy radome and a bottom encapsulating portion and is used for encapsulating the conical helical antenna plate unit, and an N-type connector which is located at the center of the bottom of the fixture unit and is used for transmitting the received GIS external signals to the partial discharge acquisition unit.
Owner:CHINA ELECTRIC POWER RES INST +3
Method capable of increasing PID (proportion integration differentiation) control speed and precision
InactiveCN104950666AAvoid stayingQuick responseElectric controllersLower limitProportion integration differentiation
The invention relates to the field of automatic control, particularly to a method capable of increasing the PID (proportion integration differentiation) control speed and precision, and aims to provide a method which is high in response speed, small in overshoot and capable of increasing the PID (proportion integration differentiation) control speed and precision. The method comprises steps as follows: A, when a PID controller begins to work, the proportional gain coefficient of the PID controller is adjusted once every 1,100 milliseconds; B, during adjustment of the proportional gain coefficient, the proportional gain coefficient is adjusted as per the law that the coefficient is decreased progressively; C, the upper output limit value and the lower output limit value are adjusted respectively while the proportional gain coefficient is adjusted; D, during adjustment of the upper output limit value and the lower output limit value, the difference between the upper output limit value and the lower output limit value is decreased progressively. The method has the advantages as follows: the control precision is increased while the control response speed is increased, and the overshoot is reduced; the dynamic response of a system is improved, and shocks caused by frequent actions are eliminated.
Owner:SOUTHWEST PETROLEUM UNIV
ECG (electroglottograph) measuring method and device for vocal cords
InactiveCN102824164AExclude external interferenceNon-invasiveDiagnostic recording/measuringSensorsBandpass filteringMeasurement device
The invention relates to ECG (electroglottograph) measuring method and device for vocal cords. The method includes the steps of firstly, coating the surface of an electrode plate to obtain a contact layer; secondly, tightly attaching the electrode plate to a vocal cord position on a neck; thirdly, fixing the electrode plate, allowing a testee to make voice, and outputting vocal cord signals from an audio output end after being processed by the electrode plate and the ECG measuring device. 2MHz signals are applied to thyroid cartilage to apply high frequency excitation to a throat so as to eliminate external interference from myoelectricity, a microphone and the like. The signals of the electrode are measured and are subjected to bandpass filtering, a detecting circuit and bandpass filtering to obtain corresponding impedance changes. Vocal cord vibration is reflected by contacting the electrode with throat and measuring electrical characteristic changes of a volume conductor at the throat. The modes of the vocal cord vibrations can be measured objectively, quantitatively and directly without invasion.
Owner:CHANGZHOU QIANJING REHABILITATION CO LTD
Crossroad traffic signal lamp time variable control system
InactiveCN105046989AExclude external interferenceFixed position adjustableControlling traffic signalsTraffic signalControl system
The invention relates to a crossroad traffic signal lamp time variable control system. According to the invention, laser correlation devices mounted at lane outlets of a crossroad are used to identify vehicles waiting for release at the lane outlets and calculate the number of vehicles which reach to a current crossroad after being released at a last crossroad, so that the traffic light timing plan is determined timely.
Owner:张金木
Method and device for testing quality factor of transmission coil in high-frequency wireless power transmission system
ActiveCN108872753AThe result is accurateExclude external interferenceElectrical testingQ factorResonant capacitor
Technical scheme of the invention provides a method and device for testing the quality factor of a transmission coil in a high-frequency wireless power transmission system. Aiming at a condition thatthe stray capacitance of a transmission coil cannot be neglected, the method and device employs a feed coil and an additional high-frequency resonant capacitor for indirect testing, accurately test the internal resistance of the transmission coil under the high-frequency condition, and determines the quality factor of the transmission coil according to the internal resistance. Through the testingof the self-inductance and mutual inductance of the coil under a low-frequency condition, the method and device eliminate the impact from a parasitic parameter of the coil, employ an external tuning capacitor as a compensation capacitor to adjust the self-resonant frequency of the transmission coil, facilitate the testing of the coil at the working frequency, indirectly testing the internal resistance and quality factor when the coil works at the working frequency through the coupling effect of the feed coil and the transmission coil, and eliminates the external interference.
Owner:CHINA ELECTRIC POWER RES INST +2
Field direct-current partial discharge test system and method for converter transformer
InactiveCN109581168AExclude external interferenceImprove accuracyTesting using acoustic measurementsCorona dischargePartial discharge
The invention discloses a field direct-current partial discharge test system and method for a converter transformer. The system comprises a direct-current high-voltage generator, a voltage regulator,a control device and a partial discharge instrument; the control device is connected with the direct-current high-voltage generator; the voltage regulator is connected with an input unit sleeve in thedirect-current high-voltage generator; the direct-current high-voltage generator is connected with a valve side winding of the converter transformer through a voltage-sharing ring and an anti-coronawire; and the partial discharge instrument is connected with the valve side winding of the converter transformer. By adopting the system, the field direct-current partial discharge test of the valve side winding of the converter transformer is realized; the direct-current high-voltage generator is connected with the valve side winding of the converter transformer through the voltage-sharing ring and the anti-corona wire so as to eliminate field corona discharge interference or magnetic suspension discharge interference; and by adopting the multi-channel partial discharge instrument, whether the polarity of direct-current voltages in a plurality of channels is consistent with the polarity of a voltage provided by the direct-current high-voltage generator or not is recognized to judge, recognize and eliminate external interference pulses, so that the field test accuracy is improved.
Owner:云南电力技术有限责任公司
Method and device for detecting leakage of shell type heat exchanger
InactiveCN101408466BImprove detection accuracyImprove detection efficiencyFluid-tightness measurement using fluid/vacuumPlate heat exchangerShell and tube heat exchanger
Owner:宁夏电力科技教育工程院
Dust material quantity detection device for dust collection device of sewing machine
ActiveCN106757867AReduce speedReduce energy consumptionSewing-machine control devicesControl signalElectric machinery
The invention provides a dust material quantity detection device for a dust collection device of a sewing machine. The dust material quantity detection device at least comprises a processor (5), an ultrasonic detection unit (6) and an alarming unit (7), the processor (5) controls air suction action of an air suction motor (4) and detection action of the ultrasonic detection unit (6) according to a speed control signal, and the ultrasonic detection unit (6)is controlled by the processor (5) to detect dust material quantity in a dust collection bucket (2) by transmitting ultrasonic waves into the dust collection bucket (2). Dust collection work and detection work are done at different times according to the speed control signal of a pedal speed controller, and the rotating speed of the air suction motor is stopped or lowered when the sewing machine does not work, so that energy sources can be effectively saved, energy consumption can be lowered, automatic stopping and alarming can be realized after the dust material quantity reaches an extreme limit, and the motor can be protected effectively. Multiple working frequency points are introduced, working frequency is changed according to actual circumstances, outside interference is eliminated, and reliability is guaranteed.
Owner:ZHEJIANG ZOBOW MECHANICAL & ELECTRICAL TECH
Small-size vibration-free quick temperature change test device
InactiveCN102169066AEasy to excludeExclude external interferenceCooling/ventilation/heating modificationsStrength propertiesTemperature controlMiniaturization
The invention discloses a small-size vibration-free quick temperature change test device. The small-size vibration-free quick temperature change test device comprises a lower box body, an upper box body and a test cavity, wherein the lower box body comprises a lower heat insulation baffle plate, a lower semiconductor refrigerator fixing sleeve, a lower water-cooling boss, a lower supporting stud, a lower high-power semiconductor refrigerator, a lower double-stage semiconductor refrigerator, a lower heat insulation particle layer and a lower water pipe opening; and the upper box body comprises an upper heat insulation baffle plate, an upper semiconductor refrigerator fixing sleeve, an upper water-cooling boss, an upper supporting stud, an upper high-power semiconductor refrigerator, an upper double-stage semiconductor refrigerator, an upper heat insulation particle layer and an upper water pipe opening. The small-size vibration-free quick temperature change test device has good temperature control effect and is free from mechanical vibration; the heat insulation baffle plates are adopted between the box body and the cavity and used for sealing, and heat insulation material particles are filled between the box body and the cavity, so the small-size vibration-free quick temperature change test device can be used for heating and refrigerating; the temperature change rate is 30 DEG C per minute; the small-size vibration-free quick temperature change test device can be applied to the field of optical coherence detection, in particular high-precision temperature stress optical coherence detection systems for separating vibration interferences.
Owner:ZHEJIANG UNIV
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