31 results about "Material under test" patented technology

The present invention relates to a method (100) for dielectric spectroscopy of a material or a tissue under test, comprising the following steps: measuring (110) the reflection coefficient (11) signal as a function of the frequency of said material or tissue under test, by a vector network analyzer (3), wherein a single applicator (5) is in contact with said material or a tissue under test and wherein the applicator (5) is operatively connected to the vector network analyzer (3); multiplying (120) the reflection coefficient (11) signal with the frequency behavior of an ultra-wide band (UWB) signal as a synthetic applicator excitation; converting (130) the signal of the previous step into the time domain by an Inverse Fourier Transform (IFT); suppressing (140) part of the converted signal of the converting step (130), according to the applicator (5) geometry; converting back (150) the signal of the suppressing step (140) to the frequency domain; and extracting (160) from the frequency signal converted the dielectric properties (162) and / or estimating (170) the dimension of the material or a tissue under test and / or of an ablated area of the material or a tissue under test thereof. The present invention also relates to an apparatus for dielectric spectroscopy (1).

This invention discloses a TDR-based system and method for measuring the thickness of multilayer dielectric materials, relating to the field of microwave testing technology, enabling thickness measurement of multilayer dielectric materials in a non-destructive environment. The system includes: a vector network analyzer, an antenna module, and a metal calibration plate. The vector network analyzer emits microwave pulses at a set frequency to the multilayer dielectric material under test. The antenna module focuses the reflected waves generated by the microwave pulses as they pass through the multilayer dielectric material. The metal calibration plate is placed on the starting layer of the multilayer dielectric material to generate the first corresponding time-domain signal reflection peak when the microwave pulse is incident, thus locating the starting position of the multilayer dielectric material. The vector network analyzer also acquires the frequency-domain signal focused by the antenna module, performs a Fast Fourier Transform on the frequency-domain signal to obtain a time-domain signal, calculates the time-domain signal based on the starting position, and outputs the thickness parameters of each layer in the multilayer dielectric material under test.

The application provides a composite material defect detection system and method. It relates to the field of nondestructive testing technology. It is used to solve the problem of inaccurate detection of small defects under low power excitation. It comprises: a multi-excitation signal generation module that provides different excitation modes, each excitation mode selectively enhances the response of a specific type of defect in the composite material under test; output excitation signals matching target instructions; an ultrasonic excitation module that receives excitation signals and converts them into mechanical vibrations; the mechanical vibrations are transmitted to the composite material under test in the form of symmetrical surface contact to excite the internal defect area of the composite material under test to form a temperature difference relative to the non-defect area; an infrared thermal image acquisition module that acquires thermal image data of the composite material under test through a thermal imaging technology matching the excitation signal; a synchronous control and signal processing module that receives thermal image data and obtains defect positions based on the thermal image data.

Provided are apparatus and methods for sensing material degradation through sensing of mass accumulation. In some aspects, the apparatus and methods employ a material such as aerogel in conjunction with a force-sensing device such as a piezoelectric sensor placed in contact with or in proximity to a material under test. Degradation of the material under test is sensed by sensing a change in mass of the aerogel absorbing parts or particles of material lost by the unit under test that, in turn, acts to further place force on or deform the piezoelectric sensor enabling real time measurement of degradation by sensing changes in the output voltage of the piezoelectric sensor. These changes in output voltage may then be correlated to the mass degradation of the unit under test.

This disclosure relates to the field of insulating material testing, including a method and system for evaluating the nonlinear strength of insulating materials based on high-frequency component analysis. The method involves applying an excitation electrical signal of a first preset frequency to the insulating material under test; acquiring the response signal obtained by the insulating material in response to the excitation electrical signal based on a second preset frequency; performing time-frequency transformation on the response signal to obtain the frequency characteristics of various preset higher harmonic components; and determining the evaluation result of the nonlinear strength of the insulating material based on the frequency characteristics of these higher harmonic components. This method allows for obtaining the evaluation result of the nonlinear strength with a single excitation and response acquisition; it eliminates the need for multi-voltage point step testing in traditional techniques, shortening the testing cycle, improving testing efficiency, and enabling efficient, accurate, and standardized determination of the nonlinear strength evaluation result.

This invention discloses an eddy current flaw detector and method for detecting extremely fine wire cracks in conductors, comprising: the output end of a resonant generator is connected to the transmitting end of a detection probe to form a 1-40MHz resonant frequency detection source; when the detection source approaches the material under test, it induces a current on the surface of the material under test; the receiving end of the detection probe is connected to the input end of a signal conversion module to receive the resonant frequency signal returned by the material under test; the detection probe generates a change in resonant frequency based on the change in the induced current of the material under test; the signal conversion module converts the resonant frequency signal generated by the detection probe into a voltage signal; the output end of the signal conversion module is connected to a recording and analysis module for real-time recording and analysis of the voltage signal to achieve flaw detection of the material under test. This method can detect extremely fine wire cracks.

The invention discloses test equipment and a test method, relates to the technical field of detection, and aims to solve the problem that mechanical properties and stress states of a to-be-tested material in the full-section and full-depth direction cannot be simultaneously measured in a pipeline safety detection mode. The testing equipment comprises a base and a detection device, and the detection device is arranged on the base and comprises a support, a motor assembly, an indentation pressing assembly, an ultrasonic detection assembly, a coercive force detection assembly, a microscopic observation assembly and a temperature detection assembly. The bracket is arranged on the base; the motor assembly is configured to provide power; the indentation assembly is configured to measure the mechanical property and the structural stress state of the tested material; the ultrasonic detection assembly is configured to measure the thickness of a measured material; the coercive force detection assembly is configured to measure anisotropic characteristics of the measured material; the microscopic observation assembly is arranged in the indentation assembly and is configured to observe residual indentation morphology parameters of the tested material; the temperature detection assembly is configured to measure the temperature state of the measured material.

The invention discloses a method for obtaining a coating catalyst film (CCM). The method comprises the following steps: obtaining a friction coefficient of a material to be detected; determining whether the friction coefficient is between 0.1 and 15; and if so, applying the to-be-tested material to a CCM process to obtain the CCM.

The present invention provides a method and system for predicting the fracture toughness of a steel material, a device, and a medium. The method comprises: acquiring carbon content distribution data of a steel material under test, selecting a carbon content from the carbon content distribution data and designating same as a target carbon content; calculating upper shelf impact energy and a temperature offset of the target carbon content by means of a first calculation model; generating a fracture toughness curve for the target carbon content on the basis of the upper shelf impact energy and the temperature offset; calculating tensile strength corresponding to the target carbon content by means of a second calculation model, and calculating yield strength corresponding to the target carbon content by means of a third calculation model; generating a blunting line equation for the target carbon content on the basis of the tensile strength and the yield strength; on the basis of the fracture toughness curve and the blunting line equation, generating plane-strain fracture toughness corresponding to the target carbon content; and collecting statistics about the plane-strain fracture toughness corresponding to each target carbon content to generate fracture toughness data of the steel material under test. The present invention can provide input for assessment of the ductile tearing failure of carbon-segregated structures.

The invention discloses an encapsulation stress testing device and testing and determining methods for a multi-layer winding composite material, and belongs to the technical field of material stress tests.The stress testing device comprises an inner cylinder, a first end cover, a second end cover, an outer cylinder and a container, and the inner cylinder is provided with a strain measuring piece and a temperature measuring piece; the first end cover and the second end cover are respectively connected with and seal the inner cylinder; the interval between the inner cylinder and the outer cylinder is used for filling the multi-layer winding structure, so that the inner side and the outer side of the multi-layer winding structure are in contact with the inner cylinder and the outer cylinder respectively and are restrained. The testing method adopts the testing device, the thermosetting fluid is poured and cured, and synchronous testing is performed. According to the determination method, a calculation formula is obtained by establishing a stress relation. According to the method, the forming process of the potting stress of the multi-layer winding composite material structure can be monitored, the influence of constraint conditions on the potting stress of the tested material is considered, the potting stress states of the multi-layer winding composite material structure under different constraint degrees can be reflected, and the stress diagnosis method has a wider application range.

A full-coverage areal density measurement mechanism, comprising a plurality of groups of measurement units (1) distributed along the strip travel direction of a material under test. Each group of measurement units (1) is arranged on the same straight line along the web width direction of the material under test, two adjacent measurement units (1) in the web width direction of the material under test are respectively located on different straight lines, and the effective measurement widths of a plurality of measurement units (1) cover the web width of the material under test. Adjacent measurement units (1) are assembled together, so that full-coverage areal density measurement of any wide web material can be realized, and two adjacent measurement units (1) are not arranged on the same straight line, so that the influence of ray crossing on the accuracy of areal density profile measurement can be avoided; and in addition, a single measurement unit (1) has a relatively small ray fan beam angle, avoiding large-angle oblique incidence, and the difference in radiation quantity at different positions on an elongated light spot is small, ensuring relatively consistent results of areal density measurement across the entire web width.

The application provides a composite indentation method for obtaining material residual stress and stress-strain relationship, and belongs to the technical field of residual stress, and comprises the following steps: step 1: a composite indenter is used to perform a quasi-static indentation test on a measured material to obtain a continuous load-displacement curve, wherein the composite indenter is a composite structure of a plane and a cone; step 2: a loading coefficient C F and a loading index m are obtained from a load-displacement curve obtained in a plane indentation stage; step 3: a loading coefficient C C is obtained from a P-h curve obtained in a cone indentation stage; step 4: material constitutive relationship parameters and residual stress are obtained according to C F and m obtained in step 2 and C C obtained in step 3, and material stress-strain relationship is obtained.

The application discloses a kind of test equipment and test method, it is related to detection technical field, it aims at solving the problem that pipe safety detection mode cannot simultaneously determine the mechanical properties and stress state in the full cross section full depth direction of measured material.Test equipment includes base and detection device, detection device is located in base, and it includes support, motor assembly, indentation component, ultrasonic detection component, coercive force detection component, microscopic observation component and temperature detection component;Support is located in base;Motor assembly is configured to provide power;Indentation component is configured to determine the mechanical properties and structural stress state of measured material;Ultrasonic detection component is configured to determine the thickness of measured material;Coercive force detection component is configured to determine the anisotropy characteristics of measured material;Microscopic observation component is located in indentation component, and it is configured to observe the residual indentation topography parameter of measured material;Temperature detection component is configured to determine the temperature state of measured material.

This invention relates to the field of materials physics testing technology and discloses a product defect detection method based on machine vision. The method includes: applying a single-pulse energy beam using a pulsed radiation source, acquiring a polarization image sequence of the material under test, and calculating the phase delay; dividing the sequence into a first sampling interval dominated by thermal conduction and a second sampling interval dominated by elastic relaxation; extracting the background deformation component in the second sampling interval, and differentially offsetting the phase delay in the first sampling interval to filter out macroscopic thermal expansion signals and obtain local defect feature fields, thereby identifying internal defects. This invention utilizes the physical parameters of the thermodynamic relaxation stage as a dynamic benchmark to solve the temporal aliasing problem between macroscopic deformation noise and microscopic thermal resistance signals under transient thermal excitation, achieving physical decoupling of subsurface micro-defect features and background stress, improving the signal-to-noise ratio of internal stress quantization, and ensuring the physical quantification accuracy of deep microcrack detection in semiconductor wafers.

Certain disclosed implementations include a measurement system configured to characterize a response signal for detecting physical characteristics of a material under test (MUT), the measurement system having: an electronic circuit configured to: transmit an excitation signal into the MUT and transmitting a reference signal to a set of magnitude and phase (M / P) detectors; receive the response signal from the MUT based on the excitation signal; and adjust at least one of the excitation signal or the reference signal based on a comparison of the response signal and the reference signal with the set of M / P detectors.

A test fixture for improving fidelity of thermal oxidative stability testing includes an environmental test chamber and a test material holder. The environmental test chamber includes an enclosure and a controller. The enclosure with an opening that provides access to an internal compartment defining a chamber environment. The controller controls the chamber environment within the internal compartment. The test material holder, at least partially disposed in the internal compartment, holds a material under test. The environmental test chamber and the test material holder expose a frontside of the material under test to a first environment and expose a backside of the material under test to a different environment. Various test fixtures and methods for improving fidelity for thermal oxidative stability testing are provided.

This invention discloses a device and method for measuring the thermal conductivity of insulating materials. By placing the reference end of a thermocouple in the reference box of the material under test, aligning it with the position of the thermocouple's measuring end in the test box, this invention ensures that the measuring and reference ends are affected identically by external environmental temperature disturbances. When measuring the thermal conductivity of a material in high or low temperature environments, since the ambient temperature cannot be completely stable, when the ambient temperature fluctuates, the thermocouple reference and measuring ends are under the same heat transfer boundary conditions, and the effects will be synchronous. Furthermore, this invention ensures that when the hot wire is heated, the temperature of the thermocouple reference end is unaffected by the heating of the hot wire, thus guaranteeing that the thermoelectric potential measured by the thermocouple is caused by the temperature rise of the material in the test box.

This invention discloses a multi-temperature, multi-frequency measurement method for unattended testing of materials under test. This invention relates to the field of materials measurement technology and solves the problem that using a single frequency point for signal measurement in practical processing can lead to significant measurement accuracy errors. Through innovative in-depth analysis of scattered signal waves, and based on the regular characteristics of scattered signal waves when the internal medium density of the material is uniform and stable, this invention can accurately identify the optimal frequency point under different ambient temperatures. Compared to traditional fixed-frequency or blindly trial-and-error measurement methods, this method, based on feedback from the material's own characteristics, greatly improves the targeting of the measurement, making the subsequent acquisition of S-parameter data more accurate and providing a solid foundation for the precise analysis of the material's electromagnetic properties.

The invention relates to the technical field of experimental equipment, in particular to multi-field coupling transparent large-scale multifunctional experimental equipment and a method, the multi-field coupling transparent large-scale multifunctional experimental equipment comprises a rack, the rack is provided with a loading assembly, and the loading assembly is used for carrying out multi-direction coupling loading on a to-be-tested material; the loading box adopts a split type design, and the loading box is clamped and fixed on the rack through a fixing frame movably arranged on the rack; the loading box is provided with a clamping assembly for clamping a to-be-tested material from multiple angles, and the clamping assembly is in transmission connection with the loading assembly; the environment coupling assembly is arranged on the loading box and is used for coupling different environment conditions in the loading box; the monitoring assembly corresponds to the loading box and is used for monitoring the state of the to-be-tested material. The device is compact in structure and convenient to use, integrates multiple functions of loading, environment simulation, monitoring and the like, forms a complete experiment system, improves the experiment efficiency, and reduces the experiment cost.

This invention provides a crystal orientation evaluation method that allows for the simple evaluation of the crystal orientation of a metal material under test over a wide range. [Solution] The crystal orientation evaluation method includes a wall-to-wall dimension acquisition step in which the dimension L between opposing wall surfaces Wa and Wb of the object to be measured W is obtained as the ultrasonic propagation distance; a propagation time measurement step in which ultrasonic waves are incident into the object to be measured W from an ultrasonic probe 10 positioned opposite wall surface Wa, and the reflected or transmitted ultrasonic waves are detected to measure the ultrasonic propagation time T between the pair of wall surfaces Wa and Wb; and a sound velocity value calculation step in which the sound velocity value C is calculated from the wall-to-wall dimension L and propagation time T of the object to be measured W. These steps are performed at multiple measurement points on the object to be measured W, and the tendency of the crystal orientation in the object to be measured W is evaluated based on the sound velocity value C at each measurement point.

According to various implementations, an apparatus for electromagnetic impedance spectrographic characterization of a material under test (MUT) includes: a planar array of at least two electrodes configured to be placed in electromagnetic communication with the MUT, wherein during operation of the planar array, at least one of the electrodes comprises a transmitting electrode for transmitting an electromagnetic signal over a range of frequencies through the MUT to at least one receiving electrode in the planar array; and a backer ground plate at least partially surrounding the at least two electrodes, the backer ground plate being electrically grounded and insulated from the at least two electrodes, wherein the backer ground plate extends from a plane formed by the at least two electrodes and separates the at least two electrodes to create an electrically isolated volume proximate to the at least two electrodes.

The utility model belongs to the technical field of material testing equipment, and particularly relates to an overload protection device for a testing machine and compression testing equipment, and the overload protection device comprises a shell, a first connecting module, a second connecting module, an elastic force storage part and an overload feedback module, the second connecting module is arranged at the bottom of the shell in a sliding manner; the elastic force storage piece is arranged in the shell and arranged between the first connecting module and the second connecting module in an abutting mode. The overload feedback module is arranged on the outer side of the bottom of the shell, and the second connecting module is in transmission connection with the overload feedback module through a transmission piece; the overload protection device has an overload protection function, and when a test force value exceeds a safety force value, the second connecting module slides upwards and enables the overload feedback module to trigger a limiting system or an emergency shutdown device, so that the test is interrupted in time, and the test machine or a tested material is prevented from being damaged due to overload.

The utility model discloses a tool applied to a dielectric constant test, which comprises a loading module, a detection module, a detection module and a control module, and is characterized in that the loading module is provided with an accommodating cavity corresponding to a tested material; the number of the blending and connecting modules is two, the blending and connecting modules are connected with the two ends of the charging module respectively, and at least one blending and connecting module is detachably connected with the charging module; the allocation connection module is provided with an excitation signal reflection cavity corresponding to the accommodating cavity; a plurality of steps are arranged on one side wall of the excitation signal reflection cavity; the charging module and the blending and connecting module are made of insulating materials; and the coaxial line connecting part is mounted on the deploying and connecting module. The steps in the two excitation signal reflection cavities are correspondingly equal in height. The coaxial line connecting part is an SMA connector seat. And the SMA connector seat is detachably connected with the allocation connection module. And the cavity space of the accommodating cavity is a rectangular body.

The utility model discloses a reflection measuring device for a wave-absorbing material, which belongs to the technical field of wave-absorbing material detection and comprises a bottom plate, a background wave-absorbing material and a placing table, a rotating component is arranged between the bottom of the placing table and the top of the bottom plate, two groups of adjusting columns are mounted at two ends of the top of the placing table, and the adjusting columns are connected with the background wave-absorbing material. A pressing plate is arranged on one side of the adjusting column, an adjusting mechanism is arranged between one end of the pressing plate and one side of the adjusting column, and a measuring assembly is arranged above the bottom plate; according to the utility model, through the cooperative use of the placing table, the adjusting column, the pressing plate and the adjusting mechanism, a wave-absorbing material needing reflection measurement can be fixed at the top of the placing table, so that the position of a tested material sample is ensured to be strictly aligned with the axis of a test antenna, and the error of a reflection path caused by sample deviation is avoided; phase sensitive measurement is prevented from being influenced after micro displacement of the sample, and the precision and accuracy of measurement are improved.

The invention provides an integrated multifunctional dielectric property intelligent analysis system. The integrated multifunctional dielectric property intelligent analysis system comprises a sensor module, a data acquisition and processing module, a cloud computing and data analysis module, a man-machine interaction module and a control module, the sensor module is a front end part of the system and is responsible for acquiring dielectric property data of a to-be-detected material; the data acquisition and processing module is responsible for receiving data from the sensor module, and preprocessing and storing the data; the cloud computing and data analysis module is a core part of the system and is responsible for deeply analyzing and mining acquired dielectric property data; the man-machine interaction module is a bridge between the system and a user and is responsible for providing a visual and easy-to-use operation interface and result display. Through mutual cooperation of the sensor module, the data acquisition and processing module, the cloud computing and data analysis module, the man-machine interaction module and the control module, comprehensive, accurate and rapid analysis of dielectric characteristics is realized.

This invention relates to the field of electrical performance testing technology for insulating materials, and particularly to a device and method for testing the high-temperature electrical performance of insulating materials. The device includes: a rigid frame, a movable plate, a manual pressurization mechanism, an upper electrode assembly, a lower electrode assembly, an electrical isolation structure, and a movable, split-type heating system. The movable, split-type heating system merges at the test position to form an annular heating cavity surrounding the insulating material under test, and separates at non-test positions to expose the insulating material. The method of this invention includes the following steps: a sample clamping step, a thermal expansion compensation pressurization step, a dynamic thermal cycling loading step, and a non-destructive withstand voltage test step. The device and testing method of this invention can accurately reproduce the key service stress state of materials, and are as intuitive to operate, easy to maintain, and flexible to configure as general-purpose tools, thereby achieving a fundamental optimization between R&D depth, quality inspection efficiency, and overall cost.

The analysis of residual stresses in materials is dynamic and accurate systems and methods for performing these analyses in non-laboratory environments can be difficult and inaccurate. A method of using a portable, field-deployable device with high accuracy is disclosed, wherein accurate and repeatable residual stress analysis can be performed in a non-laboratory environment to significantly improve diagnostics, maintenance, and life expectancy.SOLUTION: Machining a feature on the component under test at a predetermined angle by applying a Cut 190 to the face of the component under test, locating a point determined by the placement of a strain gauge 195, and removing material in the vicinity thereof to alter existing residual stresses at that point, wherein the machining comprises a plurality of light cuts without introducing additional stresses, such that the residual stresses in the region proximate the feature are isolated from those in the bulk; SELECTED DRAWING: Figure 1F

This invention discloses a method for locating and imaging local micro-defects based on nonlinear ultrasonic guided wave mixing, belonging to the field of nondestructive testing technology. The method includes: screening guided wave modes on the material under test; exciting two fundamental frequency guided wave signals to form a mixing region in the material; measuring the propagation velocity of the fundamental frequency guided waves and calculating the mixing point position; adjusting the excitation delay to achieve mixing point movement and region scanning; acquiring signals and performing frequency domain analysis to extract the nonlinear mixing signal; and then performing defect determination and imaging. This invention utilizes the high sensitivity of nonlinear ultrasonic guided wave mixing to micro-damage, achieving precise location and imaging of early-stage micro-defects in materials, thus solving the problem of insufficient identification capability of traditional nondestructive testing methods for minute damage.

This application relates to the field of electromagnetic shielding performance testing technology, specifically to a method for testing the electromagnetic shielding performance of conductive nanofiber nylon fabric. The method includes: acquiring various loss data at preset detection locations on the fabric material under test at various electromagnetic wave frequencies; for any type of loss data, acquiring the local difference coefficient, overall distribution difference coefficient, and comprehensive distribution difference coefficient at each electromagnetic wave frequency; acquiring the electromagnetic interference influence coefficient and comprehensive influence coefficient at each detection location at each electromagnetic wave frequency; obtaining the test interference degree at each detection location by comparing the comprehensive influence coefficients of each detection location with those of other detection locations at each electromagnetic wave frequency; filtering the loss data at each detection location; and obtaining the shielding effectiveness test results at each detection location at each electromagnetic wave frequency. This application aims to improve the accuracy of electromagnetic shielding performance testing.

This invention provides a composite material defect detection system and method, relating to the field of nondestructive testing technology. It addresses the inaccuracy of detecting minute defects under low-power excitation. The system includes: a multi-excitation signal generation module providing different excitation modes, each selectively enhancing the response of a specific type of defect in the composite material under test; outputting an excitation signal matched to a target command; an ultrasonic excitation module receiving the excitation signal and converting it into mechanical vibration; transmitting the mechanical vibration to the composite material under test in the form of symmetrical surface contact to excite a temperature difference between the defective region and the non-defective region within the composite material; an infrared thermal imaging acquisition module acquiring thermal image data of the composite material under test using thermal imaging technology matched to the excitation signal; and a synchronous control and signal processing module receiving the thermal image data and determining the defect location based on the thermal image data.