43results about How to "Rich measurement methods" patented technology

The invention relates to a method for detecting six trace sweetening agents in white spirit by an ultra-high pressure liquid chromatography-time-of-flight mass spectrometry (UPLC-TOF-MS) technology. Particularly, the invention adopts the UPLC-TOF-MS technology and specially aims at the phenomenon of trace addition of a plurality of sweetening agents in the current white spirit industry. The invention can detect six sweetening agents of acesulfame-K, soluble saccharin, sodium cyclamate, sucralose, aspartame and neotame simultaneously, is rapid, simple and convenient, has accurate qualification and quantification and high sensitivity and effectively solves the problem. The method has the detection limit of the acesulfame-K of 0.05mg / L, the detection limits of the soluble saccharin, the sodium cyclamate and the neotame of 0.01 mg / L and the detection limits of the sucralose and the aspartame of 0.1 mg / L, only needs 10 min of one-step sampling analysis and has favorable linear relation and repeatability. Compared with detection data of an authority depart, the data detected by the method is also accurate and reliable.

The invention discloses a measuring-compensating device and method for a single-frequency interference linearity error and position thereof. After passing a half-wave plate, the polarization direction of a linearly polarized light beam output by a single-frequency laser is adjusted to 45 degree relative to the paper surface, the modulated linearly polarized light beam is split by a first depolarization splitting prism, a transmitted light beam enters a Wollaston prism type laser single-frequency interferometer, a reflected light beam enters a Michelson type laser single-frequency interferometer, the Wollaston prism type laser single-frequency interferometer serves as a sensing unit to process formed circularly polarized and linearly polarized interference signals, and a linearity error and a position thereof are measured. An error detection and compensation part uses the Michelson type laser single-frequency interferometer as a sensing unit, formed thickness-equivalent interference fringe images are analyzed, swing and pitch angles are measured, a measuring result of the linearity error and the position thereof is compensated according to the measured pitch angle, and the measuring precision of the linearity error and the position thereof is improved.

The invention relates to a laser induction multiple spectrum united fingerprint network online detecting material method which comprises the following steps of: firstly, irradiating a detected sample with laser and simultaneously utilizing a spectrograph to detect a fluorescence excitation spectrum, a plasma spectrum or a Raman spectrum of the detected sample; and secondly, comparing the spectrums of the detected sample with the traditional spectrums. In the first step, a computer or a smart mobile phone is used for collecting a spectrum signal obtained by the spectrograph and transmitting the signal to a central server, the central server is connected with a default multiple spectrum united fingerprint database through a data switching system, and the default multiple spectrum united fingerprint database is internally provided with standard spectrum fingerprint data of the fluorescence excitation spectrum, the plasma spectrum and the Raman spectrum of materials and substances. In thesecond step, the central server compares the spectrum image signal with the standard spectrum fingerprint data in the database for analysis, then determines the material property of the detected sample and returns the comparison result to the computer.

The invention, which belongs to the field of intelligent monitoring, provides a blazed-grating-based quick small angle identification method. On the basis of spectral characteristics of a first-orderdiffraction spectrum sequence of a blazed grating, quick identification of a small angle is carried out. With a Y type fiber self-alignment system, identification of a rotation angle change, being angular displacement, of a blazed grating is realized. The method comprises the following steps: establishing a Y-type-fiber-based self-collimation optical path angular displacement identification system; on the basis of a Fraunhofer diffraction principle, obtaining light intensity distribution of corresponding blazed gratings under different wavelengths on different angular displacement conditions by using a numerical simulation method and determining a blazed grating diffraction spectrum characteristics and angular displacement relationship; and putting forward a two-blazed-grating-based differential angular displacement identificaiton principle and system and determining an angular displacement identification method based on differential double-blazed-grating diffraction spectrum cross-correlation spectral analysis. The method has a simple structure; identification is done rapidly; with the differential structure, the sensitivity is improved and the external interference is reduced.

The invention relates to a three-dimensional visualized and interaction method of a project structured message, which comprises the following steps that: step A: a project structured message is loaded, a message main body in the project structured message is identified, an exclusive mark which is used for the differentiation is set for each message main body; step B: an attribute contained by the message main body is sorted out: each message main body has one or more attributes, and each attribute represents one characteristic of the main body; step C: common attribute characteristic of the message main body is analyzed, the common attribute characteristic is treated as a one-dimensional space and is defined; step D: the dimension to be displayed and the application method are determined according to the user request; step E: the display space is partitioned according to the selection of the message dimension, and a basic display style of the space is displayed; step F: selection is executed according to a range of each dimension in the display space, and the message main body which is visible and satisfies the display type requirement is displayed; and step G: information having the attribute which is required by the user and is not subjective to the attribute of the message main body can be supplementarily displayed.

The invention relates to a test method for the adhesion strength of the intrinsic coating for the expansion resistance of a boundary crack in the detection technical field. A wedge block inserted into a substrate is pushed by external force, so that a coating attached on a common surface of the wedge and the substrate deflects, hence the crack expands in the boundary between the coating and the substrate; by a microscopic observing device, the geometry of the crack is directly observed from the side or surface of the specimen, and the adhesion strength of the coating is calculated by the mechanics of fracture. The test method overcomes the shortcomings of prior test method for adhesion strength of coating such as complex preparation of specimen, pollution of the coating and substrate boundary, and impossibility for observing direct the crack at film-substrate boundary, etc., and provides a simple and rapid way for measuring the adhesion strength of coatings quantitatively.

The present invention discloses a method for rapidly measuring the liquid phase diffusion coefficient based on liquid core column lens equal observation height. According to the present invention, the used liquid core column lens is used as the liquid phase diffusion cell and the imaging element; one height on a CMOS image acquisition system is used as the observation height, the relationship among the image width, the refractive index and the concentration is measured with two methods, the liquid phase diffusion coefficient is obtained through least square method fitting according to the concentration information reflected by the image, and the equal observation height method is verified by using the mutual diffusion system between 0.33 mol / L KCL solution and 3 mol / L KCL solution as the example; and the method has characteristics of rapid measurement (about 70min) and accurate measurement value (relative error is less than 2%), further improve the method for measuring the liquid phase diffusion coefficient by using the liquid core column lens, and proves that the system for measuring the liquid phase diffusion coefficient by using the liquid core column lens is stable, the calculation method is diverse, and the accuracy of measurement result is high.

The invention discloses a terahertz time-domain spectroscopy system-based stress measurement method. The method comprises the following steps: placing an experimental piece and loading equipment into a constructed terahertz spectroscopy system together; generating a terahertz pulse by utilizing a femtosecond laser, and receiving a signal by utilizing a terahertz detecting device; acquiring phase frequency curves under an unloaded working condition and a loaded working condition; performing subtraction on the two phase frequency curves to obtain a terahertz wave phase difference value caused by external stress; reversely deducing a stress component of an loaded experimental piece by utilizing the change of a terahertz wave phase; optimizing the stress component of the experimental piece through a target function, and acquiring a final stress result. A transparent material can be measured by the method, and a non-transparent material can also be measured by the method without manufacturing an experimental model. According to the method, an improved terahertz time-domain spectroscopy system is utilized; the internal stress information of a loaded piece is obtained by analyzing the phase change of a terahertz wave; a new experiment means is provided for detecting the internal stress of an object.

The invention discloses a device for measuring heat exchange characteristics of a high-temperature molten salt in a micro-channel. The device comprises a high-temperature molten salt heating pipe section, a water circulation pipe section, a test and product collecting pipe section and a data collecting and display module. High-pressure nitrogen gas pushes a high-temperature molten salt so that a flow heat exchange system is established in a micro-channel. A pressure reducing valve and a regulating valve adjust the flow of a working medium. A thyristor transformer adjusts heating power so thatthe system operation temperature is kept. Through the heat balance principle of a brine heat exchanger, the molten salt flow is measured. An electronic balance records the molten salt weight in real time and calculates the molten salt flow. Compared with the existing device, the device has the advantages of low cost, easy operation and reliable operation. The device improves the measuring method of the high temperature molten salt heat exchange, and fills the technical defects of the current molten salt heat exchange characteristic measurement in the micro-channel.

The invention discloses a wearable device for integrated collecting and health monitoring of vital signs, which can complete the collecting and monitoring of five vital signs indexes of blood oxygen,pulse, blood pressure, electrocardiogram and body temperature, and comprises a signal collecting module, a signal processing module, a wireless transmission module and a data receiving module, whereinthe signal collecting module is responsible for the collecting of physical signals, in which the pulse / blood oxygen acquisition circuit uses reflective blood oxygen acquisition mode, more universal.The signal processing module calculates and stores the collected signals, in which the blood pressure calculation unit uses indirect measurement to obtain continuous blood pressure signals. The wireless transmission module transmits the data to the data receiving module, which can be divided into three modes according to the types of receiving terminals: Bluetooth transmission, GPRS transmission and GSM transmission. The invention adopts the digital fiber knitting method to manufacture, and the physical sign data can be stored and displayed in the server and the terminal, thus realizing the purpose of real-time monitoring and complementary calibration of each physical sign.

The invention relates to a paddy field plow pan information continuous sensing device which comprises an attitude sensor, two sets of feeler lever sensing devices and a data acquisition device. The attitude sensor is installed on a tractor body, and the two sets of feeler lever sensing devices are installed on left and right front wheel main pins of a tractor respectively; the feeler lever sensingdevice comprises a supporting frame, a parallelogram mechanism, a force sensor, an angular displacement sensor, a feeler lever and a constant-pressure mechanism; the supporting frame is relatively fixed to the main pins, the feeler lever, the constant-pressure mechanism and the force sensor ascend and descend relative to the supporting frame through the parallelogram mechanism, and the angular displacement sensor is installed on the parallelogram mechanism. The invention further relates to a paddy field plow pan information continuous sensing method. Plow pan depth information and plow pan depth soil resistance on a running path of the paddy field tractor can be continuously sensed at the same time, measurement means of a paddy field terrain and a soil bearing capacity are enriched, and the device and the method belong to the technical field of soil information sensing.

The invention discloses an orthogonal bidirectional creep testing device which comprises a testing rack; a horizontal fixing system and a vertical fixing system which are used for fixing a tested sample are arranged at the lower side of the top of the testing rack; a vernier caliper with a meter is arranged on each of the horizontal fixing system and a vertical fixing system; a horizontal loading device is connected at the right side of the horizontal fixing system; and a vertical loading device is connected at the lower part of the vertical fixing system. The invention synchronously discloses a testing device using the testing device. The operation is convenient and simple, the cost is low, the stability is good; the bidirectional creep test to the grid material is achieved, the energy is saved and the environment is protected during the testing process, and the orthogonal bidirectional creep testing device is easy to maintain.

The invention provides a complex scene driving risk prediction method based on multiple space-time diagrams, and the method comprises the steps: constructing the multiple space-time diagrams which describe different space-time relationships among vehicles in a peripheral multi-vehicle complex scene, inputting the fused multiple space-time diagrams into a graph convolutional neural network, and extracting the feature vectors of the multiple space-time diagrams of the scene; taking a multi-time-space diagram feature vector sequence extracted at each moment in an observation period as a multi-step input feature of a long-short-term memory neural network, and training multi-vehicle time-space sequence samples in different risk states to obtain a driving risk prediction model; and acquiring motion information of the vehicle and multiple surrounding vehicles in real time, extracting a multi-space-time diagram feature vector sequence among all vehicles in an observation period in real time, inputting the multi-space-time diagram feature vector sequence into the driving risk prediction model, and finally obtaining a multi-vehicle collision risk state prediction result at a future moment. The method is suitable for multi-vehicle collision risk prediction in a peripheral multi-vehicle complex scene, and the accuracy and practicability of the prediction model are improved.

According to the power grid resource data collecting and recording method, the technical problems that an existing power grid information data collecting and recording mode needs manual secondary processing, and material consumption and labor consumption are caused can be solved. The method comprises the following steps of S100, creating corresponding collecting and recording tasks for different lines, and determining collecting objects respectively; S200, positioning a collection object by utilizing power grid resource collection equipment, and obtaining position information of the collectionobject; S300, photographing the collection objects, obtaining image information of the collection objects, and recording the relationship among the collection objects; And S400, storing the task attribute information, the position information, the picture information and the topological connection relation information between the collection objects into a database. According to the invention, theadvantages of a traditional handheld GPS and a paper plotting mode are fully combined, so that the measurement means is more perfect and practical; The data result is output through one key, manual secondary arrangement correspondence is not needed, the overall data collecting, recording and online working efficiency can be improved, and secondary manual arrangement errors can be avoided.

The invention relates to a method for detecting six trace sweetening agents in white spirit by an ultra-high pressure liquid chromatography-time-of-flight mass spectrometry (UPLC-TOF-MS) technology. Particularly, the invention adopts the UPLC-TOF-MS technology and specially aims at the phenomenon of trace addition of a plurality of sweetening agents in the current white spirit industry. The invention can detect six sweetening agents of acesulfame-K, soluble saccharin, sodium cyclamate, sucralose, aspartame and neotame simultaneously, is rapid, simple and convenient, has accurate qualificationand quantification and high sensitivity and effectively solves the problem. The method has the detection limit of the acesulfame-K of 0.05mg / L, the detection limits of the soluble saccharin, the sodium cyclamate and the neotame of 0.01 mg / L and the detection limits of the sucralose and the aspartame of 0.1 mg / L, only needs 10 min of one-step sampling analysis and has favorable linear relation andrepeatability. Compared with detection data of an authority depart, the data detected by the method is also accurate and reliable.

The present invention discloses a method for rapidly measuring the liquid phase diffusion coefficient based on liquid core column lens equal observation height. According to the present invention, the used liquid core column lens is used as the liquid phase diffusion cell and the imaging element; one height on a CMOS image acquisition system is used as the observation height, the relationship among the image width, the refractive index and the concentration is measured with two methods, the liquid phase diffusion coefficient is obtained through least square method fitting according to the concentration information reflected by the image, and the equal observation height method is verified by using the mutual diffusion system between 0.33 mol / L KCL solution and 3 mol / L KCL solution as the example; and the method has characteristics of rapid measurement (about 70min) and accurate measurement value (relative error is less than 2%), further improve the method for measuring the liquid phase diffusion coefficient by using the liquid core column lens, and proves that the system for measuring the liquid phase diffusion coefficient by using the liquid core column lens is stable, the calculation method is diverse, and the accuracy of measurement result is high.

The invention discloses a strain gauge sensitive grid size parameter measurement method, and belongs to the field of strain gauge sensitive grid size parameter measurement. The strain gauge sensitivegrid size parameter measured by the method can qualitatively reflect the resistance of a strain gauge. The method comprises the following steps: shooting a strain gauge morphology image through a shooting device; based on the image, carrying out image preprocessing, establishing a Cartesian coordinate system, establishing a strain gauge gray distribution original curve graph, establishing a straingauge sensitive grid edge side wall gray distribution fitting curve graph, and measuring strain gauge sensitive grid size parameters according to feature points of the strain gauge sensitive grid edge side wall gray distribution fitting curve graph. The dimension parameters of the strain gauge sensitive grid refer to the width and the grid spacing of the strain gauge sensitive grid. The strain gauge gray scale distribution original curve graph can reflect the information of the strain gauge sensitive grid in the length and width directions, so that the method can qualitatively reflect the resistance change of the strain gauge. The beneficial effects of the method are that the method achieves the quick and accurate measurement of the size parameters of the sensitive grid of the strain gauge and the qualitative reflection of the resistance change of the strain gauge.

The invention discloses an orthogonal observation system and method for gas transient temperature in a pilot discharge channel. The system includes a quantitative schlieren measurement optical path, a Moiré fringe measurement optical path, a discharge electrode, a conversion unit, an oscilloscope and a data storage unit; the quantitative schlieren optical path The first image acquisition unit CA1 and the second image acquisition unit CA2 in the Moiré light path work in master-slave mode, and CA1 outputs a synchronous exposure clock signal for input to CA2, which ensures that the two are at the same shooting speed and realizes the instantaneous gas flow in the pilot channel. The comparative measurement of the state temperature solves the problem that the gas temperature measurement results of the pilot discharge channel are difficult to verify. The invention realizes the three-dimensional reconstruction of the development path of the pilot discharge channel through the orthogonal arrangement of the two flow field display and measurement optical paths, ensures that the pilot channel satisfies the coaxial symmetry assumption required for gas temperature inversion, and realizes the gas temperature of the pilot discharge channel. Transient temperature time domain continuous comparison measurement, and the measurement system has the significant advantage of self-calibration capability.

The invention relates to a wind field gradient measuring method. A lifting rope is suspended at the lower end of an aerostat, and a hanging ball is suspended at the tail end of the lifting rope. The change of the lifting rope along with time is not considered, and the measuring method comprises the following steps: 1, the hanging ball moving under a wind field load; meanwhile, the lifting rope being driven to move, taking any point U on the lifting rope; establishing a rectangular plane coordinate system by taking the fixed end point of the lifting rope as an original point 0, the initial balance position of the lifting rope as a Y axis, the vertical upward direction as a positive direction, the direction vertical to the Y axis as an X axis and the horizontal rightward direction as a positive direction, and detecting an included angle theta between the lifting rope at a U point and an OX axis or a tensile force T1 borne by the lifting rope at the U point. The method does not need a large amount of electric energy consumption, replaces a traditional wind speed detection instrument with a model calculation mode, is high in precision and reliability, can effectively measure the gradient of the high-altitude wind field in a low-energy-consumption, long-term and high-precision mode, and can be used for controlling the airship to stay at a low-wind-speed height and reducing energy consumption.

The invention discloses a method and device for measuring the ion beam eccentric angle of a Hall ion source, and the method comprises the steps: importing a picture, photographed by a CCD camera, of acircumferential discharge channel when the Hall ion source works into MATLAB for processing, and converting the picture into a picture matrix format; and calculating pixel value distribution in the photo image by MATLAB, and calculating an ion beam current vector eccentric angle. According to the invention, the problem that the eccentric angle of the ion beam is difficult to measure is effectively solved.

The invention discloses an orthogonal bidirectional creep testing device which comprises a testing rack; a horizontal fixing system and a vertical fixing system which are used for fixing a tested sample are arranged at the lower side of the top of the testing rack; a vernier caliper with a meter is arranged on each of the horizontal fixing system and a vertical fixing system; a horizontal loading device is connected at the right side of the horizontal fixing system; and a vertical loading device is connected at the lower part of the vertical fixing system. The invention synchronously discloses a testing device using the testing device. The operation is convenient and simple, the cost is low, the stability is good; the bidirectional creep test to the grid material is achieved, the energy is saved and the environment is protected during the testing process, and the orthogonal bidirectional creep testing device is easy to maintain.

The invention discloses a measuring-compensating device and method for a single-frequency interference linearity error and position thereof. After passing a half-wave plate, the polarization direction of a linearly polarized light beam output by a single-frequency laser is adjusted to 45 degree relative to the paper surface, the modulated linearly polarized light beam is split by a first depolarization splitting prism, a transmitted light beam enters a Wollaston prism type laser single-frequency interferometer, a reflected light beam enters a Michelson type laser single-frequency interferometer, the Wollaston prism type laser single-frequency interferometer serves as a sensing unit to process formed circularly polarized and linearly polarized interference signals, and a linearity error and a position thereof are measured. An error detection and compensation part uses the Michelson type laser single-frequency interferometer as a sensing unit, formed thickness-equivalent interference fringe images are analyzed, swing and pitch angles are measured, a measuring result of the linearity error and the position thereof is compensated according to the measured pitch angle, and the measuring precision of the linearity error and the position thereof is improved.

The invention provides a reinforced earth body sticky, elastic and plastic deformation measuring method, a construction method and a tensioning system. A computational formula for pre-strain reinforced earth body sticky, elastic and plastic deformation epsilon is shown in the specification. By the adoption of the sticky, elastic and plastic deformation measuring method, the pre-strain reinforced material total deformation generated after construction is more comprehensively, accurately and reliably estimated, and it is guaranteed that the initial deformation of a reinforced material is proper when the reinforced material is tensioned, so that the situation that the additional deformation of the reinforced material is too large due to the settlement deformation of an embankment is avoided, and the phenomenon that the allowing strain of the reinforced material is exceeded and consequently the reinforced material is broken and fails is prevented. By the adoption of the construction method, occurrence of geological disasters in the environments such as high and steep slope large slippage can be scientifically prevented and reduced.

The present invention discloses a building temperature and humidity monitoring system based on NB-IoT and a monitoring method using the system. The system mainly includes three parts: NB-IoT terminal, information post office and human-computer interaction platform. The NB-IoT terminal and the The human-computer interaction platform realizes communication connection by means of the information post office; the information post office includes the NB-IoT core network and the open platform of the Internet of Things, and the NB-IoT terminal uses the communication protocol to pass the collected temperature and humidity data through the NB-IoT The IoT core network is sent to the open platform of the Internet of Things, and the open platform of the Internet of Things is decoded and then sent to the human-computer interaction platform. The present invention enriches the measurement means in the context of intelligent buildings from the technical level by integrating multiple technologies and applying them in the measurement and transmission of building temperature and humidity, effectively improves the coverage of temperature measurement in intelligent buildings, and ensures the measurement accuracy and timeliness.

The invention relates to an optical probe mounting and debugging device for a machining center and a using method, the device comprises a mounting head, and the mounting head is mounted on a general tool handle or a magnetic gauge stand of a machine tool and is used for positioning and fastening in the machine tool; comprising a rotary adjusting structure, the rotary adjusting structure is connected to the lower portion of the mounting head and comprises a first rotary adjusting piece and a second rotary adjusting piece, the first rotary adjusting piece is fixedly connected with the lower end of the mounting head in a rotary adjusting mode along the Y axis, and the upper end of the second rotary adjusting piece is fixedly connected with the lower end of the first rotary adjusting piece in a rotary adjusting mode along the X axis; comprising an optical probe fixing piece, the optical probe fixing piece is connected with the lower end of a second rotary adjusting piece in a transverse adjustable mode, a mounting ring is arranged at the end, away from the end connected with the second rotary adjusting piece, of the optical probe fixing piece, and a plurality of radial jackscrew holes are evenly distributed in the side wall of the mounting ring in the circumferential direction; a fine adjustment jackscrew is installed in each radial jackscrew hole, and the electron microscope is fastened in the installation ring through the fine adjustment jackscrews. The method is high in measurement precision and wide in application range.

The invention relates to a test method and device for simulating formation of natural gas pipeline hydrate. The test method is as follows: cleaning the residual air in the pressure drop test pipe section (9), the rough pipe wall test pipe section (10), the low temperature test pipe section (11), the elbow test pipe section (12) and the flowmeter test pipe section (15); When the low temperature test pipe section (11) reaches the specified temperature, inject liquid water into the pressure drop test pipe section (9) in the form of mist droplets; observe the hydrate formation, temperature and pressure changes of each test pipe section, and record the occurrence of hydrate , growth and blockage time, flow and pressure data; according to the formation of natural gas hydrate, combined with temperature and pressure data, analyze the environmental factors and required conditions of natural gas hydrate formation, and determine the key pipeline sections that are likely to cause natural gas hydrate formation. The invention has simple operation, various measuring means, and the measured data is close to the actual pipeline transportation environment.

The invention provides a system and method for measuring horizontal deformation of a pipe jacking working well. A convergence instrument is selected as a measuring instrument, an expansion screw is driven into a supporting structure as a measuring point by an impact electric hammer after the supporting structure is drilled, the horizontal deformation of the working well is measured by using a working principle that the convergence instrument mechanically transmits displacement, a measured value is compared with a specification requirement for analysis, the stress condition of the supporting structure is judged, the safety of the pipe jacking working well in the working well construction and pipe jacking construction processes is ensured, the problem that the pile body displacement measuring points of the pipe jacking working well with the cast-in-place bored pile supporting structure are prone to being blocked and damaged and consequently the measuring data are inaccurate is solved, the measuring method of the pipe jacking working well is improved, measuring data can be compensated in time accurately after other measuring points are damaged, and the construction safety is ensured.

The invention discloses a petroleum exploration amount measuring device which comprises a measuring device body. An automatic telescopic rod is arranged right in the middle of the measuring device body. The left side of the lower end of the automatic telescopic rod is fixedly connected with an ultrasonic transmitting device. The right side of the lower end of the automatic telescopic rod is fixedly connected with an ultrasonic receiving device. An automatic rope winder is arranged on the left side of the upper end of the measuring device body, a rope is wound on the surface of the automatic rope winder, and the tail end of the rope is connected with a nuclear magnetic resonance logging tool. A partition plate is arranged on the upper end portion of a vertical shaft right behind the measuring device body. A data processing device is arranged on the upper surface of the partition plate. A control panel is arranged below the partition plate, a display screen is arranged at the upper end of the control panel, and a control device is arranged below the control panel. The petroleum exploration amount measuring device has the advantages of being reasonable in structural design, easy to operate and the like, and can be widely applied and popularized.

The invention discloses a terahertz time-domain spectroscopy system-based stress measurement method. The method comprises the following steps: placing an experimental piece and loading equipment into a constructed terahertz spectroscopy system together; generating a terahertz pulse by utilizing a femtosecond laser, and receiving a signal by utilizing a terahertz detecting device; acquiring phase frequency curves under an unloaded working condition and a loaded working condition; performing subtraction on the two phase frequency curves to obtain a terahertz wave phase difference value caused by external stress; reversely deducing a stress component of an loaded experimental piece by utilizing the change of a terahertz wave phase; optimizing the stress component of the experimental piece through a target function, and acquiring a final stress result. A transparent material can be measured by the method, and a non-transparent material can also be measured by the method without manufacturing an experimental model. According to the method, an improved terahertz time-domain spectroscopy system is utilized; the internal stress information of a loaded piece is obtained by analyzing the phase change of a terahertz wave; a new experiment means is provided for detecting the internal stress of an object.

The invention discloses an electrical measurement sample rod for a piston type pressure bag. The sample rod comprises a connecting pipe fixedly connected with the pressure bag, one end, far away from the pressure bag, of the connecting pipe is fixedly connected with a test switching part, and the test switching part is connected with an adjusting part; the test switching part comprises an adapter, and the adapter is provided with a connecting seat and an external connector; the adjusting part comprises a sliding sleeve connected with the connecting seat; and the connecting pipe comprises a hollow pipe and a wire arranged in the axis direction of the hollow pipe, and the two ends of the wire are communicated with the pressure bag and the external connector respectively. By arranging the sample rod with an adjustable length, when the length of the pressure bag changes, an up-and-down distance between the test switching part and the sliding sleeve can be adjusted to ensure that a sample bottom bracket at the bottom of the sample rod is tightly contacted with the bottom end of the inner wall of a measuring system, and good heat-conducting property is ensured, so that the measuring precision is high and the efficiency is high. And the air tightness of the sample rod is very good.