78results about How to "Low test environment requirements" patented technology

The invention discloses an underwater acoustic measurement method for scattering properties of a ship target broadband radar, which is characterized by comprising the following steps of: firstly, inversely arranging a scaled model of a measured ship target in an anechoic tank, regulating basic conditions of a measurement device and a modeling test, simulating irregular sea waves at an interface between the scaled model of the ship target and water, amplifying a linear frequency demodulation signal generated by a signal source and radiating the amplified frequency demodulation signal in a sonic signal manner, amplifying and filtering an echo output signal reflected by the scaled model and then storing, then acquiring a plurality of groups of echo signal data on each rotating angle and then storing; and finally, processing the echo signals of the scaled model of the measured ship target on different rotating angles by adopting a pulse compression technology to obtain one-dimensional distance image data of the measured ship target. The invention overcomes the defects of rigorous requirements on measurement equipment and environment and incapability of measuring sea-surface target characteristics in the prior art, and has the advantages of flexibility in the measurement method, low cost, easiness in realization and the like.

The invention relates to a method for monitoring safety performances of batteries and capacitors on line, belongs to the field of energy security correlation, and aims at effectively monitoring macro-deformation of batteries and capacitors caused by micro strain on line, effectively managing the safety performances such as heat effect and gas inflation in real time, early warning the accident, eliminating the potential safety hazards such as detonation, and analyzing the accident causes on line. According to the technical scheme, a nondestructive strain detection method is adopted, strain gages are distributed on the surfaces of the batteries and capacitors, the strain change in the operating process is monitored in real time, a to-be-failed assembly is subjected to early warning and is processed, the effective safety management of a power supply and in-situ analysis of the failure process and causes can be promoted, and the accident is eliminated in a forming state. The nondestructive method for monitoring the deformation safety performances of batteries and capacitors on line is simple, rapid, accurate and high in operability and is suitable for long-term reliable safety pre-warning and accident analysis of energy devices.

The embodiment of the invention discloses a mobile end page testing method, a device and a system. According to the embodiment of the invention, a development client is adopted for monitoring a local file, when a sending change of the file is determined, a file updating request carried with a file content after the change and a first login state identifier is sent to a server, the server generates an experience page according to the file content after the change, a mapping relationship between the first login state identifier and the experience page is built, a page access request carried with a second login state identifier sent by a mobile terminal is received, the second login state identifier and the first login state identifier are compared, the corresponding experience page is acquired according to the mapping relationship when the two are determined to be consistent, the mobile end page in the mobile terminal is refreshed, and the purpose of automatically testing the mobile end page can be realized. The test has low requirements on the testing environment, the operation is simpler, and the testing efficiency is high.

The invention discloses a method for determining a rock crack stress threshold value based on full-field strain measurement. The method comprises the following steps: manufacturing a rock sample; performing speckle treatment on the surface of the rock sample; carrying out test loading and collecting an image of a speckle surface of the rock sample in the test loading process; calculating the full-field displacement of the speckle surface of the rock sample; calculating the full-field strain of the speckle surface of the rock sample; calculating a volume strain, an elastic volume strain and a crack volume strain of the rock sample; acquiring a rock sample volume strain-axial strain curve, a crack volume strain-axial strain curve and an axial stress-axial strain curve, and drawing the curvesin the same subgraph; and determining changing rules of the volume strain of the rock sample and the crack volume strain and determining threshold values of the four crack stresses including the crack closing stress, the crack initiation stress, the crack damage stress and the peak stress of the rock sample. The method has the advantages of low requirement on test environment, more convenience inapplication, high result reliability, and higher representativeness and universality.

The invention discloses a fatigue crack growth rate measurement method based on infrared thermal imaging technology, including the following steps: spraying a black flat lacquer on a sample satisfyinga required geometric size and surface roughness to improve the surface emissivity of the sample; installing the sample, setting up an infrared thermal imager, determining an observation area, and calibrating the spatial resolution of an infrared image; setting fatigue loading parameters and infrared thermal imager sampling parameters, starting the fatigue test, and recording the temperature fieldevolution process in a fatigue crack tip region in real time; acquiring a corresponding heat source field through temperature field calculation with a two-dimensional heat transfer model, and automatically identifying the fatigue crack tip position in the heat source field; according to the change of the fatigue crack tip position, determining a crack propagation path, acquiring the fatigue cracklength at each moment, and calculating to obtain the fatigue crack growth rate. The method can be used to obtain accurate and reliable measuring results, has low requirements on test environment, iseasy to operate, and can realize non-contact measurement, full field measurement and automatic measurement.

The invention provides a Bus-Off fault testing system and testing method and belongs to the field of CAN bus fault detection. The testing system includes a power switch, more than 1 CAN nodes, a CAN bus message monitoring device, a CAN bus interferometer, a signal reflection prevention module and an upper computer, wherein the power switch is connected with the output terminal of a power source; the CAN node, the CAN bus message monitoring device and the CAN bus interferometer are connected to a twisted-pair in parallel. The upper computer includes an upper computer CANoe connected with the CAN bus message monitoring device and an upper computer CANStress connected with the CAN bus interferometer. The signal reflection prevention module includes two signal reflection prevention units having identical structures and arranged on two sides of the twisted-pair respectively. The system provided by the invention is simple in circuit construction, high in stability and can test a series of problems caused by Bus-Off faults effectively.

The invention discloses a static balance test method applied to a gyroscope position marker spindle. A horizontal axis angular position rotary table is used for mounting and clamping a gyroscope position marker to be tested, any one axis to be tested of the gyroscope position marker is parallel to the horizontal axis of the rotary table by adjusting direction of a mounting fixture, a measurement and control system drives the tested axis to complete sine small angle vibration at each locking angular position of the rotary table, value of a static unbalance can be solved by virtue of integration on measured quantities in a driving current period of the tested axis, and position of the static unbalance can be obtained by observing the driving current and an angular position signal and combining a corner of the horizontal rotary table. The concrete test process comprises the following steps of: step one, measuring torque constant of the tested axis; step two, carrying out static balance test on the gyroscope position marker spindle; and step three, selecting the rest test axes of the gyroscope position marker and carrying out test, after the tested axis is determined, repeating the step one and the step two, and finally completing test on three tested axes, namely an outer annular axis, a middle annular axis and an inner annular axis, thus the test method disclosed by the invention is finished.

The invention designs a random vibration drive ring-down cavity calibration-free gas concentration measurement system and method. The system comprises a narrow linewidth laser light source, a light modulation module, an optical ring-down cavity and a signal acquisition and processing module. The method comprises the steps: measuring the response delay time of the optical modulation module to a driving signal; adjusting the central wavelengths of the two narrow-linewidth lasers to be located at the same or adjacent absorption peaks, and collecting a light intensity attenuation curve of light emitted by a ring-down cavity filled with gas to be detected; selecting a moment when the incident light is completely blocked as a starting point of a fitting ring-down signal to fit the data to obtainexponential attenuation coefficients corresponding to the dual wavelengths respectively; and finally, obtaining the molar fraction of the gas component by utilizing the relationship between the difference of the dual-wavelength attenuation coefficients and the gas concentration. The dual-wavelength time-sharing frequency-selecting function of the ring-down cavity is achieved through random vibration; the structure is simple, the cost is low, the adaptability to the measurement environment is high, and the dual-wavelength time-sharing frequency-selecting ring-down cavity has a higher use valueand good application prospects in the field of gas detection.

The invention discloses a linear acceleration sensor for a bionic-ear stone implement structure, and the acceleration sensor comprises a rigid housing, a flexible elastic body, a plurality of parallel piezoelectric fibers comprising metal cores, a rigid element pasted at the top of the flexible elastic body, and an elastic element connected with the rigid element and the external rigid housing, wherein the piezoelectric fibers are fixed at the bottom of the grid housing. The symmetric electrodes of the piezoelectric fibers are led out through two wires, and the two wires are respectively connected to the positive and negative electrodes of an input end of a charge amplifier. The whole sensor is fixed on a vibration exciter. When the vibration exciter vibrates up and down, the elastic element stretches and withdraws and drives the rigid element. At this moment, the flexible elastic body will deform, and the piezoelectric fibers will also deform elastically. Moreover, the piezoelectric fibers in the flexible elastic body will obtain an impact signal. Because of the piezoelectric effect, surface electrodes on a piezoelectric material will generate charges. Because the positions of electrodes are different, the charges generated on the electrodes or the voltages are different. Therefore, the acceleration information can be obtained through the collection of the charge signals on the electrodes and the data processing and analysis.

The invention relates to a method for measuring the cohesiveness of cement-based building mortar, belonging to the field of cement mortar performance detection. The method is suitable for detection of the building mortar, particularly the building mortar prepared by various types of machine-made sand. The method comprises the following steps of A, preparing the mortar; B, measuring the water use amount of the mortar; and C, measuring the expansion degree of the mortar. According to the measurement method, the target thickness meeting the requirement of actual production is firstly determined by virtue of measurement on the water use amount of the mortar; then the aim of estimating and controlling the cohesiveness of the building mortar is fulfilled by measuring the expansion degree of the mortar, so that a standard support for supplying mortar suitable for building site construction can be achieved in actual production; meanwhile, the operability of directly and objectively estimating the cohesiveness of the mortar can be improved.

The invention discloses a sleep snore monitoring method and system based on the bass ratio. The method includes the following steps of recording sleep snores of a patient at the whole night, extracting each sleep snore signal in the record, conducting octave frequency band filtering on each sleep snore signal, obtaining multiple levels of octave frequency band sound pressure or multiple sound pressure level values of each sleep snore signal so as to obtain the bass ratio of each sleep snore, and monitoring the sleep snores at the whole night according to the bass ratio of each sleep snore. According to the method and the system, by calculating the bass ratio of the sleep snores of the patient, whether the snores of the patient are normal snores or abnormal snores is judged, the serious degree of the obstructive sleep apnea-hypopnea syndrome (OSAHS) is judged, and the primary diagnosis is provided for the patient; meanwhile, the selectable method is provided for the subjective evaluation on the post-operation effect.

The invention relates to a nondestructive testing method and a nondestructive testing device for a crack of a metal part. The nondestructive testing method for the crack of the metal part comprises the following steps of (1), connecting the two ends of a to-be-tested part with a direct-current power supply, and enabling an infrared lens of an infrared thermal imager to face the to-be-tested part; (2), selecting the time and the size that the to-be-tested part is subjected to the direct-current power according to the dimension and the material property of the to-be-tested part and a position where the crack damage exists, and electrifying the to-be-tested part; (3), after the electrification of the to-be-tested part is completed, observing and imaging the electrified to-be-tested part through the infrared thermal imager, showing that the crack does not exist in the to-be-tested part if an imaged image is in a same color, and showing that the crack exists in the to-be-tested part if the imaged image is in different colors. As a circumferential motion effect and a Joule heating effect are adopted for the nondestructive testing method and the nondestructive testing device for the crack of the metal part, higher temperature rises can be automatically generated at the position of a crack tip by both the circumferential motion effect and the Joule heating effect, and the position of the crack damage of the part is easily and accurately determined. In view of reasons above, the nondestructive testing method and the nondestructive testing device for the crack of the metal part can be widely used for the field of the nondestructive testing of metal cracks.

The invention discloses a portable bearing rotating precision comprehensive detection platform which can quickly identify bearing key indexes. The portable bearing rotating precision comprehensive detection platform comprises bearing clamping diameter-adjustable structure units which are arranged to be in longitudinal symmetry, a dynamic gap removing unit, a gap removing component and a portable measuring clamping accessory. Each bearing clamping diameter-adjustable structure unit comprises a disk, three radial adjusting rails with the same value, a bearing supporting plate and a limiting rod unit. The portable bearing rotating precision comprehensive detection platform can achieve three-point centering type clamping, enables the gap between the inner diameter part and the outer diameter part to be removed, and is high in testing precision, accurate, fast, low in requirement for a testing environment and convenient to popularize. The portable bearing rotating precision comprehensive detection platform is not rusted and free of maintaining, small in size and easy to carry, and the weight of the platform is about 1kg. Further, the radial adjusting rails and the limiting rod units adjust in a sliding mode, and quick measuring of various specifications of bearing rotating precision indexes to be measured in the rotating gap-removing state can be achieved. The portable bearing rotating precision comprehensive detection platform is small in manufacturing cost, low in operation difficulty, and capable of greatly shortening the detection period, lowering cost, and meeting the regular demands for timeliness and small cost of enterprises.

The invention discloses a device and a method for quantitatively detecting defects of a self-compacting concrete filling layer of a ballastless track. The device comprises a base plate, a metal grating, filling particles, a sampling paper and a counting device. The detecting method comprises the following steps: covering the sampling paper on a pit position on the surface of a measuring area, calibrating and imitating an outline of the pit; covering the sampling paper on the surface of the metal grating; filling the filling particles into the metal grating in the imitated pit outline area on the sampling paper; collecting the filling particles filled in the metal grating and calculating the area of the defect outline. The device is capable of acquiring the defect rate of the self-compacting concrete filling layer through quantitative test analysis, so as to objectively evaluate the filling quality of the self-compacting concrete filling layer. The method disclosed by the invention hasthe characteristics of simple operation, convenience in use, being scientific and reasonable, and the like, is wide in application range and is especially suitable for the test evaluation for concreteconstruction quality of the filling layer of plate-type ballastless track or similar structures.

The invention discloses an automatic testing device of a direct detection type radiometer. The automatic testing device comprises a program control direct current power source (4) and a temperature sensor (7). A display control device (1) comprises a human-machine interaction module (1-1), a control module (1-2), an attenuation control card (1-4) and a data collecting card (1-3). A noise source (2) outputs noise and is output after passing through a numerical control attenuator (6) and a three-decibel electrical bridge (5). The display control device (1) outputs different noise temperatures serving as the temperature sensitivity measuring basis by controlling the attenuation values of the numerical control attenuator (6). A microwave signal source (3) outputs signals with different frequencies and powers. The data collecting card (1-3) finishes collecting of data output by the radiometer. Temperature sensitivity, bandwidth and integral time testing processes and data processing are finished through the display control device (1). A method has the advantages that a noise source is controlled easily, the requirement for the test environment is low, the testing speed is high, and the device is simple.

The invention discloses a control system and method suitable for a micro-nano detection and processing module. The system includes a micro-nano dual-mode detection and processing module, a three-coordinate workbench, a PZT driver, a UMAC, a charge amplifier, a lock-in amplifier, an XY piezoelectric scanning bench, a router, an upper computer, a CCD, an XY-direction displacement sensor, and a Z-direction displacement sensor. The UMAC is selected as a control core, and characteristics of a high-performance servo ring, high scalability and a high integration degree are adopted to realize macro-micro linkage control. An analog signal mode is adopted to ensure real-time performance of signal processing and transmission, and a design requirement is satisfied. A capacitive displacement sensor signal is amplified, phase locking processing is performed, and the signal is served as a closed-loop control reference signal, a test result is accurate and the requirement to a test environment is low, and muN-level closed-loop control can be realized. Through usage of the lock-in amplifier, a noise signal in the capacitive displacement sensor test result is eliminated, which facilitates closed-loop precision control.

The invention discloses a nanometer flexible blood glucose microsensor and a preparation method of the nanometer flexible blood glucose microsensor. The nanometer flexible blood glucose microsensor comprises a flexible substrate, an epoxy resin layer, an electrode structure and a glucose oxidase membrane layer, wherein the flexible substrate has the good temperature adaptability (-10 to 300 DEG C), the electrode structure has the excellent conductivity and can resist acid and alkaline corrosion, the glucose oxidase loaded microchannel (the length of the channel is smaller than 10mm, and the width of the channel is 10-500 [mu] m) is formed by the nanometer material texture, is good in flexibility and high in sensitivity, forms the linear dependence within the glucose concentration (0.5-30 mmol / L) range, and has the good invertibility and repeatability, and a hydrophilic wear-resistant film has the good ion penetrating property, strong water absorption property and the effect of protecting the sensitive layer. The nanometer flexible blood glucose microsensor is non-toxic and harmless, has the comfort in contacting the human skin and causes no allergy, the overall structure does not exceed 1cm<2>, and the in-situ real measurement and analysis for the blood glucose level (0.5-30 mmol / L) of the human blood can be realized through current response.

The invention relates to a model device and method used for field measuring of the blockage degree of an opening pile interior soil plug. The device comprises a test pile, an anchor pile, a datum line beam and a counter-force groove. An opening is formed in the lower end of the test pile. A bearing sheet is fixed to the top of the test pile and provided with a jack. A load sensor is arranged on the top of the jack. The top end of the jack abuts against the lower end face of the counter-force groove. A magnetic force meter base is arranged on the datum line base and provided with an electronic dial indicator used for measuring the displacement of the bearing sheet. The load sensor is connected with a value force measuring instrument. The test pile is provided with a reserved hole. An inner iron ball is arranged in the test pile and connected with a thin rope. The thin rope penetrates the reserved hole and is connected with an outer iron ball located outside the test pile. The model device is simple in structure, easy to operate and convenient to transport, mount and dismount, the requirement for the needed testing environment is low, and the opening pile blockage degrees under various kinds of soil properties can be judged.

The invention discloses a method and device for obtaining the minimum turning radius of a vehicle, and the method comprises the following steps: controlling the vehicle to carry out the minimum turning test, and obtaining a positioning signal of the vehicle in the minimum turning test process through a positioning module on the vehicle; drawing a driving track circle of the vehicle according to the positioning signal of the vehicle; and obtaining the radius of the running track circle, and obtaining the minimum turning radius of the vehicle according to the radius of the running track circle,the axle distance of the vehicle, the distance between the installation position of the positioning module and a front axle of the vehicle and the wheel distance of front wheels of the vehicle. According to the method provided by the embodiment of the invention, the requirement on the test environment is reduced, the measurement precision is high, the vehicle does not need to be greatly transformed, the test can be realized by virtue of the positioning module on the vehicle, the operation is simple, the test personnel do not need to work outside the vehicle, the manpower and material resourcesare saved, and the working feeling of the test personnel is greatly improved.

The invention relates to a system and a method for measuring a hinge angle of a full trailer train. The measuring system comprises a tractor, a trailer, at least one laser range finder, a reflecting plate, a data acquisition instrument and a data analyzer; the tractor is connected with the trailer; the at least one laser range finder is arranged at the front end of the trailer, and the reflectingplate is arranged at the rear end of the tractor; or, the at least one laser range finder is arranged at the rear end of the tractor, and the reflecting plate is arranged at the front end of the trailer; and the laser range finder, the data acquisition instrument and the data analyzer are connected in sequence. The system is simple in structure, does not need to change the train, is convenient toinstall, can achieve the real-time measurement of the hinge angle of the train in a road state without being limited by a hinge mechanism of the train, so that the lateral stability of the train is analzyed.

The invention discloses a channel performance test system and method for a satellite navigation anti-interference baseband chip. The channel performance test system comprises a navigation signal simulator and a test evaluation unit, wherein the navigation signal simulator comprises a signal simulation unit and a control unit, and the control unit is used for generating or receiving externally input simulation and control parameters and sending the simulation and control parameters to the signal simulation unit and the test evaluation unit; the signal simulation unit is used for generating a digital baseband signal of a satellite according to satellite navigation simulation and control parameters and sending the digital baseband signal to the anti-interference baseband chip through an optical fiber; and the test evaluation unit is used for receiving the positioning calculation information output by the anti-interference baseband chip, comparing the positioning calculation information with the simulation and control parameters, and judging the channel performance of the anti-interference baseband chip. The invention further discloses a test method which is used for the system. The method has advantages of improving the test efficiency and the test accuracy, reducing the test cost and the like.

The invention provides a temperature-dependent solid material thermal diffusion coefficient measuring device and method and belongs to the technical field of material thermophysical property testing.The temperature-dependent solid material thermal diffusion coefficient measuring device comprises a cylindrical testing material, an armored micro temperature measurement thermocouple, a temperature recorder, a thermostatic tube furnace, a cooling device and data analyzing software, wherein the armored micro temperature measurement thermocouple is arranged inside the cylindrical testing material,the cylindrical testing material is arranged inside the thermostatic tube furnace, the armored micro temperature measurement thermocouple is connected with the temperature recorder, the temperature recorder is connected with the data analyzing software, and the cooling device cools the cylindrical testing material. By measuring the temperature-to-time change laws of two different positions in theradius direction inside the cylindrical testing material and on the basis of analytic solution of transient heat conduction, the temperature-dependent solid material thermal diffusion coefficient measuring device and method can help acquire the nonlinear equation related to thermal diffusion coefficients and further acquire thermal diffusion coefficients. The temperature-dependent solid material thermal diffusion coefficient measuring method can achieve temperature-dependent continuous measurement of the thermal diffusion coefficients of solid materials.

The invention discloses an NTC heat-sensitive chip testing method, and belongs to the field of electronic component preparation. The NTC heat-sensitive chip testing method comprises the steps of testing to acquire a benchmark product and a limit product in the same batch of products to be tested and calculating to acquire deviation between the benchmark product and the limit product, connecting the benchmark product and the limit product to a thermistor tester at the normal temperature so as to be tested and comparing the benchmark product and the limit product to acquire a percentage deviation value, setting a resistance range of qualified products in the thermistor tester, and carrying out constant temperature treatment on a product to be tested and the benchmark product in a normal temperature environment and connecting the thermistor tester to test, wherein if the resistance of the product to be tested meets the set range, the product to be tested is a qualified product. The method disclosed by the invention converts a test for an NTC heat-sensitive chip in an oil tank / water tank environment to a test in a normal state environment, requirements for the test environment are low, the NTC heat-sensitive chip is tested directly without loading or unloading a fixture in the testing process, the test process is simplified, the test efficiency is improved, and the test speed is about 8 times of the test speed of an oil tank testing method.

The invention discloses a dirt detection method for a projection device. The dirt detection method comprises the following steps of acquiring a projection image of a second projection device at a first projection distance, obtaining first dirt information corresponding to the projection image, converting the first dirt information into second dirt information corresponding to a second projection distance according to a pre-stored conversion coefficient, the first projection distance being smaller than the second projection distance, and judging the dirt of the second projection device according to the second dirt information. The invention further discloses a detection device and a computer readable storage medium, and the effect of reducing the detection cost is achieved.

The invention provides a measuring device for the coaxiality of internal and external sleeve teeth in a box body. The measuring device comprises a front core shaft and a supporting sleeve which are coaxial; three slide supporting blocks slide in the radial direction along with the axial displacement of the front core shaft; a two-dimensional tilt angle sensor is fixed to the front end of the frontcore shaft to detect the spatial angle change of the axis; a hinge joint head is fastened to a rear core shaft; the front end of the hinge joint head is fixed in a ball socket of the front core shaftand can rotate relative to the ball socket; a fixing half ring and the rear core shaft form a slide groove; the rear core shaft is restrained and realizes planar slide; a rear end cover is peripherally provided with eddy current sensors for detecting the axial movement of the rear core shaft; the rear end cover reflects the central axis of external sleeve teeth and an external contour ring formedby the slide supporting blocks reflects the central axis of internal sleeve teeth; the coaxiality of the internal and external sleeve teeth can be calculated according to the signals collected by thetwo-dimensional tilt angle sensor and the eddy current sensors. The device can effectively prevent introduced error of cantilever measurement and rapidly judge the coaxiality of the internal and external sleeve teeth, thereby being suitable for on-site use.

The invention relates to a method for detecting light rare earth hydride using non-contact raman spectrum, belongs to the crossing field of material science and substance detection and aims to solve the problem in detection of light rare earth metal hydride and detection of types of surface impurity. The method comprises the step of putting the light rare earth metal hydride which needs to be detected into a colorless and transparent bottle, adding a dispersant subjected to anhydrous and anaerobic treatment into the bottle, and sealing; performing scan detection by using a raman spectrometer, removing the sealed bottle and characteristic peak of the dispersant to obtain a spectrogram peak curve and data of the light rare earth metal hydride; then comparing with a curve and the peak value of the standard raman spectrum of the corresponding light rare earth metal oxide and light rare earth metal hydride, and determining substance types of related major impurity in a sample to be detected. The method provided by the invention is convenient for detection, easy to operate, high in accuracy, safe and reliable in detection process, low in requirements on testing environment, simple in sample preparation and low in economic cost.

The invention discloses a method for realizing a data verification test of a large-capacity SSD on a small memory machine, which comprises two parts of random data writing and data verification, during random data writing, the storage mode of an LBA sequence is determined according to a mode parameter in command parameters, when the mode is equal to 1, a low-configuration test machine is encountered, the LBA sequence is not recorded, when the mode is equal to 2, the LBA sequence is stored in a local file, and when the mode is equal to 3, the LBA sequence is stored in a memory through a bitmap; in the data verification process, an LBA sequence is generated, and different verification modes are adopted according to the mode of storing the LBA sequence in the data writing process. The SSD equipment data consistency testing method effectively meets the requirement for SSD equipment data consistency testing with the industry content increasing continuously, the requirement for a testing machine is low, the testing efficiency and quality are improved, and the testing cost is effectively reduced.

The invention relates to a method for analyzing the content of unsaturated acids in a liquid phase mixture by gas chromatography. The unsaturated acids in the liquid phase mixture include acrylic acid and acetic acid. The method comprises the following determination steps: firstly, determining the total acid molar concentration in a to-be-tested liquid by an acid-base titration method; then determining the content of acrylic acid and acetic acid by the gas chromatography; and finally measuring the molar concentration of acrylic acid. The determination method has the advantages of low cost, simple and convenient operation, low requirements on a test environment, no need of large-scale analysis equipment, simple and rapid method, accurate determination results and good repeatability.

The invention belongs to the technical field of test projectile testing, relates to nondestructive recovery of test projectiles, in particular to a multi-stage soft recovery method for the high-speed test projectiles and an auxiliary device of the multi-stage soft recovery method, and solves the technical problems in the background technology. The method comprises the step that the high-speed test projectiles can be shot into a first-stage gas-liquid mixing uniform deceleration section, a second-stage liquid deceleration section and a third-stage soft solid mixture deceleration section in sequence so as to achieve the nondestructive recovery of the high-speed test projectiles. By means of the method, the nondestructive recovery of the high-speed test projectiles can be achieved, and the recovery distance is short. The auxiliary device is low in manufacturing cost, the gas-liquid mixing ratio of each section is adjusted through a bubble generator and an air pump to enable the density to be a required numerical value, the situation that the high-speed test projectiles are decelerated to be in a low-speed state capable of achieving the safe recovery after the high-speed test projectiles are shot out of the first-stage gas-liquid mixing uniform deceleration section is guaranteed, and the situation that the high-speed test projectiles are decelerated until the projectiles are motionless is further guaranteed through the second-stage liquid deceleration section and the third-stage soft solid mixture deceleration section.