89results about How to "Does not affect measurement results" patented technology

A chemical and biological transducer is prepared by setting two long period fibre gratings, fibre covering and fibre core on one piece of fibre to form a MZ interferometer and then plating a metal film on fibre covering surface to form SPR transducer of fibre MZ interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer formed as above, fibre spectrograph and computer as said transducer is set in gas or solution of chemical composition or biological molecule to be tested.

The invention relates to a real time measuring device and a method thereof for the orientation of a fast axis of a quarter wave plate. The device consists of a collimated light source, a polarizer, a standard quarter wave plate, a diffraction light splitting element, a focusing lens, a polaroid analyzer array, a photodetector array, an amplifying circuit and a signal processing system. The measuring method includes as follows: the parallel light beams exited by the collimated light source after passing through the polarizer and the standard quarter wave plate form a circularly polarized light; the circularly polarized light after passing through the quarter wave plate to be detected is split by the diffraction light splitting element; a plurality of sub-light beams with equal intensity are focused on the polaroid analyzer array by the focusing lens to respectively generate polarization interference for forming interference light intensities with a certain displacement in turn which are received by the photodetector array; a telecommunication signal outputted by the photodetector array after passing through the amplifying circuit is processed by the signal processing system, thus being capable of obtaining the orientation angle of the fast axis of the quarter wave plate to be detected in real time.

The invention discloses a sensing device for finger detection. An inflatable ring and a circular rubber wrapping sleeve are installed in a shell. The two ends of the inflatable ring are respectively connected with the opening of the shell and the circular rubber wrapping sleeve. A proximal knuckle is sleeved in the inflatable ring, and a far-end knuckle and a middle-end knuckle are sleeved in the circular rubber wrapping sleeve. The outer periphery of the circular rubber wrapping sleeve is supported on the shell inner wall through an elastic supporting net. An air port of the inflatable ring is connected with a gas pressure sensor fixed in the shell. An inflation inlet and a gas vent of the inflatable ring are connected with a pressure-regulating device through an air pipe. A first photoelectric sensor and a second photoelectric sensor are respectively installed on the opening of the side surface of the circular rubber wrapping sleeve corresponds to the far-end knuckle and the middle-end knuckle. The sensing device for the finger detection integrates various finger detection in one sensing device so as to be used conveniently, reduces the discomfort and pain of users due to the fact that the inflatable ring replaces the traditional finger cuff, and can tightly fit for the finger so as to improve the measuring precision on the premise that comfortableness is ensured.

The invention relates to error compensation of an on-line in situ measurement system in machining operation, provides a method or a device which can avoid the influence of the turntable indexing error of a machine tool and the radial and axial movement errors of a rotating shaft so as to carry out error compensation. In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the device for compensating the indexing error of the machine tool is structurally characterized in that N master balls are arranged on a round master ball disc; the N master balls are arranged on the same height of the master ball disc, and are uniformly distributed on the excircle concentric periphery of the master ball disc; and the master ball disc is arranged on a turntable of the machine tool, and the excircle of the master ball disc and the rotating shaft of the turntable of the machine tool are concentric. The method and device provided by the invention are mainly applied to mechanical quantity processing measurement.

A system used for measuring size of article is featured as distributing the first and the second confocal microscopic measurement device at end surfaces of the first and the second sides on direction of article size to be measured and setting the first objectives of two confocal microscopic measurement devices to face separately to two end surfaces of article to be measured then carrying and setting the first objective of the second confocal microscopic measurement device on displacement unit for getting near to or far from measured article end surface being faced by said objective in following with axial movement of said displacement unit.

The invention provides a device for hydrophobicity detection and aging evaluation of a composite insulator based on ultraviolet optical characteristics of liquid drop discharge. On the premise of guaranteeing safe operation of electric transmission and transformation equipment, the ultraviolet optical characteristics of discharge of liquid drops on the surface of the composite insulator are obtained effectively and used for reflecting the existing state and distribution of the liquid drops on the surface of the composite insulator and the aging conditions of the composite insulator, and corresponding aging evaluation criteria are provided. By means of the device, hydrophobicity reducing factors causing external insulation flashover accidents can be subjected to early detection and diagnosis, the resolution and accuracy of surface hydrophobicity detection of the composite insulator are improved, and continuity and reliability of power supply and distribution of an electric power system are effectively guaranteed.

The invention relates to a double refraction realtime measuring device and method. The device is characterized by comprising an alignment light source, a circular polarizer, a spectroscope, a first Wollaston prism, a second Wollaston prism, a first double quadrant detector, a second double quadrant detector and a signal processing unit. According to the device and the method, double refraction of a sample can be measured in real time, and the measurement result is not affected by light-intensity variation.

The invention provides a method for hydrophobicity detection and aging evaluation of a composite insulator based on the ultraviolet optical characteristics of liquid drop electric discharge. According to the method, on the premise that safe operation of electric transmission and transformation equipment is guaranteed, the ultraviolet optical characteristics of liquid drop electric discharge on the surface of the composite insulator are effectively obtained and are used for reflecting the existing state and the distribution of the surface liquid drop of the composite insulator and the aging condition of the composite insulator, a corresponding aging evaluation basis is provided, hydrophobicity lowering factors causing an external insulation flashover accident can be detected and judged early, the definition and the accuracy of the surface hydrophobicity detection of the composite insulator are improved, and the continuity and the reliability of power supply and distribution of a power system are effectively guaranteed.

A chemical and biological transducer is prepared by setting long period fibre grating, reflecting film on fibre section, fibre covering, fibre core and metal film on fibre covering surface on one piece of fibre to SPR transducer of fibre Michelson interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer prepared as above, wide band coupler, fibre spectrograph and computer.

The invention discloses a method for measuring fineness of raw silks in real time and a device of the method. The device comprises a parallel optical field, a microspur imaging system, a photoelectric sensor and an image processing system. During measurement, standard sample silks and raw silks to be measured are placed in the same parallel optical field, after reflecting light of the standard sample silks and the raw silks is in Fourier transform, the photoelectric sensor obtains a frame of image signals of the standard sample silks and the raw silks to be measured, and measurement results of the fineness of the raw silks to be measured are obtained via data processing. As the reflecting light of the raw silks is acquired during measurement, saturation of photosensitive elements of a CCD (charge coupled device) is avoided effectively, and distortion due to microscopy imaging is avoided by the aid of microspur imaging. Simultaneously, as the raw silks to be measured and the standard sample silks are located in the same optical field, measurement precision cannot be affected by environment factors, and accuracy and stability of measured values are effectively improved. The method and the device are applicable to measuring fineness of raw silks, wool, textile fibers and the like, and the device is an effective tool for realizing non-contact real-time dynamic fiber fineness detection.

A DC potential difference meter with four measuring plates is composed of four measuring plates of 20*8omega, 10*0.88omega, 9*0.76omega and 10*0.176omega .It features that all measuring resistances are directly connected by wires to exclude variation and contact resistance of measuring-stepping switch from measuring result and minimum resolution ratio of said meter can be one muV.

The invention relates to a distance-measuring method and a device for an optical fiber, which comprises a wavelength-scanning light source (1), fiber-optical couplers (2, 2', 2''), fiber-optical gratings (3, 3'), a fiber-optical collimating device (4), a surface of an object for measuring (5), light-sensitive detectors ( 6, 6'), an A / D convertor (7) and a computer (8). Outlet light of the wavelength-scanning light source is separated to two paths through the fiber-optical couplers, one light path enters into the two fiber-optical gratings whose central wave length are different, reflected light of the fiber-optical gratings are detected by the light-sensitive detectors, the other path which enters into the fiber-optical collimating device is partially reflected by the end surface portion of the collimating device, the reflected light is partially reflected return to the fiber-optical collimating device by the surface of the object for measuring, two beams of the reflected light are detected by the light-sensitive detectors after being interfered. Output signal of the light-sensitive detectors is input into the computer through the A / D convertor, an distance between the end surface of the fiber-optical collimating device and the surface of an object for measuring is calculated through fourier transform white light interferometric phase demodulation method.

The invention discloses a non-contact type instantaneous rotating speed sensing method. A random image on the rotating object end face or the vortex flow field is imaged to an optical space filter pair through an optical imaging system, the optical space filter pair outputs two sets of original signals, the center frequencies of the signals are obtained according to a center frequency extraction method after the original signals are processed, the position where the rotating center imaging point is located is obtained through the change relation of the center frequencies, and then the instantaneous rotating speed is obtained by calculation on the center frequencies according to the position where the rotating center is located. According to the method, any measuring benchmark or index plate does not need to be installed on a measured rotating object, the advantages of no contact, high anti-interference performance, few error sources, low cost and the like are achieved, the pure rotating speed of the rotating object or the vortex flow filed can be measured in a remote distance, and the method can also be used for measurement of parameters such as angular displacement and accelerated speed.

The invention relates to a complete common-path type microchip laser feedback interferometer which comprises a microchip laser, wherein a first spectroscope is arranged on an axis at an emitting end of the microchip laser; a first holophote is arranged on a reflected light path of the first spectroscope; a second holophote is arranged on the reflected light path of the first holophote; a first acousto-optic frequency shifter, a second acousto-optic frequency shifter and a second spectroscope are arranged on the reflected light path of the second holophote in turn; the second spectroscope is arranged on a transmission light path of the first spectroscope; a photoelectric detector is arranged on the transmission light path of the second spectroscope; a circular light path is formed by the first spectroscope, the first holophote, the second holophote, the first acousto-optic frequency shifter, the second acousto-optic frequency shifter and the second spectroscope; the laser emitted by the microchip laser once returns to a resonant cavity of the microchip laser through the circular light path, thereby modulating an output power of the laser and forming the reference feedback light; and the laser once passing by a circular path is reflected by a to-be-detected object and returns to the resonant cavity of the microchip laser through the circular light path again, thereby modulating the output power of the laser and forming the measuring feedback light. The complete common-path type microchip laser feedback interferometer can be widely applied to the unmatched target non-contact type accurate displacement measurement.

The invention discloses an online gas monitoring control system for gas insulation equipment based on a photoelectric sensing principle. The online gas monitoring control system comprises an online integrated gas monitoring mechanism, and a control analysis mechanism interconnected with the online integrated gas monitoring mechanism, wherein the online integrated gas monitoring mechanism comprisesan automatic valve opening / closing device, a filter, a first four-way joint, an infrared gas purity detection module, a laser gas detection module, an infrared gas accurate measurement module and a second four-way joint; the automatic valve opening / closing device, the filter and the first four-way joint are communicated in sequence by virtue of pipelines; the infrared gas purity detection module,the laser gas detection module and the infrared gas accurate measurement module are connected in parallel between the first four-way joint and the second four-way joint by virtue of pipelines. The system disclosed by the invention combines a non-dispersed infrared spectrum absorption technology and an adjustable semiconductor laser gas detection technology to analyze and detect gas components, and has the advantages of being high in testing accuracy, small in air intake amount, fast response and long service life.

The invention discloses a device and method for measuring a refractive index of an intermediate infrared multi-wavelength material. The device comprises a laser diode, a beam shaping device, an input mirror, a laser crystal, a spherical surface high reflection mirror, a prism pair, a slit, an output coupling mirror, a Faraday isolator, a half-transparent and half-reflecting mirror, an adjustable diaphragm, a precise rotating platform, a spectrograph and a dual-channel power meter. The invention realizes direct measurement of refractive indexes of a material to be measured in a wide-spectrum range under different intermediate infrared wavelengths, solves the problem of difficulty in measurement of the refractive index of the material with intermediate infrared wavelength, and is simple andeasy in a measurement process, thus the measurement process of the refractive index is greatly simplified and the measurement cost is reduced.

The invention discloses a compensation method for space relative pose errors of a horizontal automatic aircraft panel boring and riveting machine. The compensation method comprises the specific steps that a cooperative work space of two locating devices in the horizontal automatic aircraft panel boring and riveting machine is analyzed, and reasonable grid division is carried out; a laser tracker establishes a space relative pose error grid through tracking and measuring the practical relative pose errors of the two locating devices, and calculates error values of arbitrary points in the cooperative work space grid through interpolations; and a strategy that the space relative pose errors of the two cooperative devices are compensated through a driven locating device according to the master-slave relation of the two locating devices, and error compensation is achieved. According to the compensation method, the cooperative working precision of the multiple devices is quickly and effectively improved, the quality of hole processing in aircraft assembly is improved, and the assembly quality and assembly efficiency of integral aircraft parts are improved.

The invention discloses a soil pressure meter embedding device. The soil pressure meter embedding device comprises a grout pipe of a high pressure jet grouting machine, a soil pressure meter, a reaction frame and a centering guide, wherein the soil pressure meter is fastened on the reaction frame through a bolt; the reaction frame is loosely connected with the centering guide through a left-hand thread, and is positioned with a positioning pin; the centering guide is connected with a filling pipe and the grout pipe through right-hand threads; and an electric wire on the soil pressure meter and an iron wire fixedly connected to the positioning pin pass through the centering guide and the group pipe, and pass through the ground. A soil pressure meter embedding method comprises the followingsteps of: putting sand aggregate into a drill hole, measuring the altitude (lower than the embedding altitude of the soil pressure meter) and connecting the grout pipe with the soil pressure embedding device; putting the assembled soil pressure meter embedding device on a designed altitude; putting water-washed and air-dried coarse sand into the drill hole while knocking the grout pipe; compactlyfilling coarse sand into the peripheral space of the soil pressure meter; pulling an iron wire on the orifice ground; pulling the positioning pin onto the ground; turning the grout pipe rightwards onan orifice to separate the group pipe from the device; and filling the sand aggregate back into the drill hole till the designed altitude is reached. According to the invention, after a cut-off wall is built, the soil pressure meter has an accurate measured result of soil pressure change caused by the load change of a wall body, and reliable basis is provided for stress analysis and comprehensiveevaluation.

The invention discloses a digital display high-sensitivity conductivity and high-resistance resistivity measuring circuit which comprises a measuring circuit body, a precise amplifying and convertingcircuit and a digital A / D converting and displaying circuit in sequential connection. The measuring circuit body sends voltage signals of a measured resistor to the precise amplifying and converting circuit, and the voltage signals are adjusted to voltages for ratio method resistivity measurement after being subjected to impedance conversion and resistivity partial pressure by the precise amplifying and converting circuit. The precise amplifying and converting circuit sends adjusted reference voltages and adjusted measurement signal voltages to the digital A / D converting and displaying circuit, and the reference voltages and the signal voltages are converted into corresponding display values by the digital A / D converting and displaying circuit to be displayed. The invention further provides a digital display high-sensitivity conductivity and high-resistance resistivity measuring method. When the to-be-measured Rx changes according to the coefficient k, the measurement signal voltages / reference voltages can change in inversion proportion according to the same change coefficient k, and therefore conductivity measurement is realized, calculation errors in the prior art can be eliminated, and the measurement precision is high.

The invention relates to a novel intervertebral measurement device. The intervertebral measurement device includes length measurement shafts, angel measurement shafts, a length dial, an expansion device, angle dials, screws and vertebral fitting surfaces. The length dial is provided with scale lines and jags; the expansion device includes an expansion device body and a clamping port; the first angle measurement shafts on the left and right sides are connected with the expansion device through the corresponding screws; the angle dials are arranged at the upper portions of the first length measurement shafts on the left and right sides respectively; the tail ends of a second length measurement apparatus and second angle measurement apparatus on the left and right sides are connected to the vertebral fitting surfaces through the corresponding screws. The intervertebral measurement device has the advantages that the length and angle between two adjacent vertebrae can be precisely and quickly measured, titanium meshes fitting the vertebrae are conveniently clipped, and therefore connection and fixation of the vertebrae are achieved; the surgery quality is improved, the surgery time is saved at the same time, the occurrence probability of complications is reduced, patients' pain is relieved, and the recovery speed of the patients after surgery is increased.

The invention discloses an intelligent thermally-insulating pipe provided with an alarm device. The intelligent thermally-insulating pipe comprises a thermally-insulating pipe body composed of a steel pipe, a thermally-insulating layer and an outer protective pipe and further comprises a test wire, an alarm wire, an outgoing joint, an outgoing line and inspection equipment. The test wire and the alarm wire are parallel with the axis of the steel pipe and pre-buried in the thermally-insulating layer, wherein a set distance is maintained between the test wire and the alarm wire and the outer side face of the steel pipe. The outgoing joint is fixed to the position, located at a preset monitoring point of the thermally-insulating pipe, of the outer protective pipe. Two outgoing heads are arranged on the outgoing joint, wherein the two outgoing heads are insulated to each other and connected with the steel pipe and the test wire or the alarm wire correspondingly. The outgoing line is connected between the outgoing joint and the inspection equipment. A plug matched with the outgoing joint is arranged at one end of the outgoing line, and a joint which is connected with the inspection equipment in a matched manner is arranged at the other end of the outgaining line. The intelligent thermally-insulating pipe provided with the alarm device is reasonable in structure and convenient to operate; the leakage problem of the thermally-insulating pipe can be found quickly; the thermally-insulating pipe can be repaired in time conveniently; and the situation that the thermally-insulating layer is eroded and carbonized due to leakage of a high-temperature medium in the pipe is avoided.

The invention discloses a measurement device based on laser distance measurement and a measurement method thereof. The measurement device comprises a camera, a base for placing the camera, a laser base and a laser head. The length and the height value of an object to be measured can be calculated by locking an animal or a building at a distance through laser, leaving laser spots on a picture, calculating the ratio of the distance between practical laser heads to the distance between corresponding laser spots on the picture and obtaining the proportion of a real object to the object in the picture. According to the device and the method disclosed by the invention, the structure is simple; the method is not influenced by the size and the distance of the object to be measured; the calculation process is convenient; in particular, the method is convenient and rapid for a movable and large-area object to be measured; and the working efficiency is greatly increased.

The invention discloses a device and a method for measuring pulse wave velocity in a small range based on a light reflection method. The method comprises: using three measuring points A, B, and C which are respectively on vertexes of an arbitrary triangle to detect pulse wave signals, after photovoltaic conversion and blocking amplification are performed on the three paths of signals, through an ADC, acquiring data and storing the data; after certain data size is acquired, performing zero phase-shift digital filtering on the acquired data strings; after zero phase-shift digital filtering processing, finding out moments corresponding to peak values of three paths of main wave crests, and meanwhile determining time difference of two wave crests; and combined with a geometric correction error method, calculating a pulse wave. The method can measure pulse wave velocity in a small area rang of a human body surface, and prevents discomfort of a tested person caused by a pressure sensor. A digital filtering method is used to overcome defects that an analog filter would cause phase shift error on the pulse wave. The device and the method are advantaged by high precision, simple operation, and real-time property, and the method provides convenience for portable and wearable design of a device.

The invention relates to a contact type linear stress sensor based on a mini-ring structure and a stress detection method thereof. The contact type linear stress sensor comprises a broadband light source, a mini-ring resonant cavity and a spectrum analyzer which are sequentially connected, wherein the mini-ring resonant cavity sequentially comprises a substrate, a lower limiting layer, a channel straight waveguide, a mini-ring waveguide and an upper limiting layer from bottom to top; the area where the channel straight waveguide and the mini-ring waveguide are located is a refractive-index sensitive area; after signal light is input from a left port of the channel straight waveguide, coupling occurs when the signal light is close to the mini-ring resonant cavity, part of light power inputfrom a channel is continuously coupled to enter the mini-ring resonant cavity, and meanwhile, part of light power in the mini-ring resonant cavity is also continuously coupled to enter the channel straight waveguide and then is output from a right port of the channel straight waveguide. The sensitive wave splitting character of the mini-ring waveguide to wavelengths is ingeniously utilized, afteroutput from the right end of the channel straight waveguide, different effective refractive indexes of a mini-ring waveguide core layer correspond to different central wavelengths, and thus the stressdetection function of the device is achieved.

The invention relates to a relative laser thickness gauge. The relative laser thickness gauge comprises a workbench, wherein the workbench is provided with a measuring piece placing area used for containing a measuring piece, and the measuring piece placing area is provided with a notch. The relative laser thickness gauge further comprises two white light confocal displacement sensors, each whitelight confocal displacement sensor comprises a laser measuring head, and the two laser measuring heads of the two white light confocal displacement sensors are opposite to each other and are vertically arranged on the two sides of the notch respectively. Thickness measurement of a part is not based on the surface of workbench, and the measuring result is not affected by the uneven surface of workbench or warping of the surface of the part. The relative laser thickness gauge can greatly improve the thickness measuring precision.

The invention discloses a high precision inclinometer and an intelligent temperature compensation system, and relates to the field of inclination angle measurement or inclination angle monitoring. The inclinometer comprises an inclination angle measuring chip and the intelligent temperature compensation system, and the intelligent temperature compensation system comprises a microcontroller, a heating sheet and a refrigeration sheet when a temperature measuring device is integrated in the inclination angle measuring chip; and when no temperature measuring device is integrated in the inclination angle measuring chip, the intelligent temperature compensation system comprises the microcontroller, the heating sheet, the refrigeration sheet and a temperature sensor, and the temperature sensor is arranged at the lateral edge of the inclination angle measuring chip. The microcontroller controls starting / stopping of the heating sheet and the refrigeration sheet and grading loading / unloading of power to obtain a temperature drift array; and when the inclinometer is used, the microcontroller automatically completes temperature compensation. The temperature compensation precision is effectively improved, the temperature compensation workload is reduced, and the working efficiency is improved.

The invention discloses an SPWM adaptive frequency conversion point based storage battery impedance measuring method. According to the measuring method, a measuring result is not influenced no mattera charger works or not, the problem that a measuring loop is interfered by the charger or load equipment can be solved effectively, the method also has advantages that a measuring result is high in precision and repeatability, and the method has high practical values.

The present invention relates to a non-contact length measuring device and belongs to the length measurement technical field. The non-contact length measuring device comprises at least one non-contact length measuring sensor; the non-contact length measuring sensor comprises a housing as well as an imaging module, an image processing module and an interface control module which are arranged in the housing; the imaging module comprises a laser light source, a focusing lens, a magnifying lens and a light sensing element; a laser beam generated by the laser light source is projected onto a measured object through the focusing lens; after being reflected by the measured object, the laser beam passes through the magnifying lens, and then the laser beam is imaged on the light sensing element; the light sensing element sends image data to the image processing module at a high frequency; the image processing module converts the image data into displacement quantity data; and the interface control module converts the displacement quantity data into pulse signals or digital signals and outputs the pulse signals or digital signals. The non-contact length measuring device has the advantages of high measurement accuracy and high speed.