47 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.

The invention discloses a method and system for measuring the dielectric constant of a material, and the method comprises the steps: enabling a terahertz pulse signal to flow through a transmission line and generate reflection through growing a coplanar waveguide transmission line on the surfaces of an electro-optical crystal and a measured material; after femtosecond laser is processed, a terahertz signal is sampled, an optical polarization state analysis system reproduces an electric signal and extracts a peak moment, and a relative dielectric constant is calculated by combining transmission line structure parameters and a formula. According to the invention, electro-optical sampling and time domain reflection technologies are combined, high time resolution and structure adaptability are realized, and accurate measurement of the dielectric constant of the material is realized.

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.

The present invention belongs to the technical field of radar absorbing material testing, and proposes a high- and low-temperature controllable reflectivity testing device and method for radar absorbing materials, comprising a microwave darkroom, a detection mechanism and a test object placement mechanism arranged in the microwave darkroom, and a temperature control mechanism; the detection mechanism comprises a first bracket arranged in the microwave darkroom, and a transmitting antenna and a receiving antenna arranged on the first bracket; the test object placement mechanism comprises a second bracket arranged in the microwave darkroom, and a cover body arranged on the second bracket for placing the test object; the temperature control mechanism comprises a temperature control box, and an air inlet duct and an air return duct connected to the temperature control box; the ends of the air inlet duct and the air return duct away from the temperature control box are both connected to the interior of the cover body, and the air volume and wind speed entering the cover body are controlled by the temperature control box, so that the temperature and humidity inside the cover body meet preset requirements, can simulate a real environment, and the setting of the cover body can ensure the uniformity of heating of the test material.

The present disclosure relates to systems and methods related to test and measurement systems, and in particular to millimeter wave material testing systems including a test and measurement instrument for testing the radar transmittance and reflectivity of a material. The test and measurement equipment measures the insertion loss of the material under test. The test and measurement equipment includes a reference device in contact with a first surface of the material under test, the reference device including a reflective component and an absorptive component. The test device is in contact with a second surface of the material under test that is opposite to the first surface. The test device includes: a first transmitter for outputting a first signal of a predetermined frequency to the reflective component of the reference device through the material under test; a first receiver for receiving the first reflected signal from the reflective component; a second transmitter for outputting a second signal of a predetermined frequency to the absorptive component of the reference device through the material under test; and a second receiver for receiving the second reflected signal from the material under test.

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 a photoluminescence test structure of an active material and a preparation method of the photoluminescence test structure, and the photoluminescence test structure comprises a substrate, a buffer layer, at least one interface layer, a to-be-tested material layer and a covering layer which are sequentially stacked, a conduction band potential barrier is arranged between the at least one interface layer and the buffer layer, and a valence band potential barrier is arranged between the at least one interface layer and the to-be-tested material layer. According to the photoluminescence testing structure of the active material and the preparation method of the photoluminescence testing structure, single-peak testing of PL is achieved, and the detection accuracy of the real peak position of the to-be-tested material is improved.

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.

This invention discloses a highly sensitive stress nondestructive testing method based on the equivalent magnetization surface effect, belonging to the field of testing, and includes the following steps: Step 1: An external magnetic field is generated by using a square wave with a constant voltage amplitude as the excitation power supply and applied to the surface of the material under test; Step 2: An electromagnetic signal generated by magnetic domain wall displacement is collected using a multi-turn coil with a magnetic core, and the electromagnetic signal generated by the equivalent magnetization surface displacement is separated and recorded as the secondary response signal; Step 3: The characteristic value of the electromagnetic signal generated by the equivalent magnetization surface displacement is calculated; Step 4: The characteristic value of the electromagnetic signal generated by the equivalent magnetization surface displacement is used for stress detection. This invention uses a square wave excitation method to generate an equivalent magnetization surface effect in the material under test, exciting the generation of a secondary response electromagnetic signal, and using the secondary response electromagnetic signal and its characteristic value for stress detection to achieve highly sensitive stress nondestructive testing.

The invention discloses a method and system for monitoring the sputtering yield of a material in real time, and belongs to the technical field of interaction of plasmas and materials. The method comprises the following steps: generating and guiding a plasma beam to continuously bombard the surface of a to-be-tested material by using a plasma generating device; collecting characteristic optical emission spectral line intensity data of specific atoms generated by sputtering on the surface of the to-be-detected material in real time; acquiring plasma ion saturation current data for bombarding the surface of the to-be-detected material in real time; based on the characteristic optical emission spectral line intensity data and the photon emission efficiency, the sputtering particle flow density of specific atoms is calculated in real time; calculating the plasma ion flux density in real time based on the plasma ion saturation current data and the effective collection area of the probe; and calculating and outputting the sputtering yield in real time according to the ratio of the sputtering particle flow density to the plasma ion flux density. According to the embodiment of the invention, the sputtering yield generated by the material can be monitored in real time, and the accuracy of the obtained sputtering yield is effectively improved.

The present invention discloses a direct detection method for equiaxed residual stress based on instrumented conical indentation technology, comprising the following steps: first, a conical indenter is used to perform an indentation test on a sample with residual stress, the maximum indentation load is fixed as F, and the load-depth curve is obtained by fitting h m 、h m ‑h f and α; the projection area A of the residual indentation is measured using an ordinary optical microscope p Calculate the contact depth h c ; The second step is to calculate the maximum indentation depth h m , the difference between the maximum indentation depth and the residual depth after unloading h m ‑h f , contact depth h c Combined with the indenter contact depth function, the maximum indentation depth h corresponding to the state without residual stress under the same load is reconstructed. m0 ; The third step is to reconstruct the maximum indentation depth h without residual stress m0 Substitute F=Ch α , and obtain the loading curvature C0 of the loading curve without residual stress; the fourth step is to integrate the loading curve at the same depth to obtain the loading work U L and U L0 , combined with the known material plastic parameters, the residual stress σ of the material being tested is calculated R .

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.

The invention provides a 1600 DEG C narrow-band multi-angle emissivity measurement system and method, and the system comprises a laser generator which is used for transmitting a high-energy laser beam to heat a measured material to a preset temperature in a high-temperature working region; wherein the temperature of the high-temperature working area ranges from 1000 DEG C to 1600 DEG C; the narrow-band spectrometer is used for measuring emissivity spectral data of the heated to-be-measured material in a near-infrared band; wherein the measurement wave band range of the narrow wave band spectrometer is 0.1 [mu] m-1. 1 [mu] m; wherein the laser generator, the measured material and the narrow-band spectrometer are arranged at a close distance but not in physical contact, and the high-temperature emissivity of the solid material within the range of 10-90 degrees can be rapidly measured in situ. By means of the system, the problems that an existing material spectrum testing system cannot test the high-temperature emissivity of the material, the heating speed is low, the material size is limited, and only the normal emissivity can be measured are solved.

The present invention relates to the technical field of ultrasonic testing, and in particular to a wedge block for ultrasonic testing of low-sound-velocity materials, and a manufacturing method for a wedge block. The present invention employs the following technical solution: the wedge block comprises a wedge block main body, wherein the wedge block main body is made of a hydrogel material or a rubber mixed mineral oil material, and the sound velocity of the wedge block main body is lower than 2000 m / s; the hydrogel material is prepared by using a water-soluble polymer and a cross-linking agent as main components in a cross-linking mode; and the rubber mixed mineral oil material is prepared by extruding thermoplastic elastic rubber and mineral oil as main components by means of a screw extruder. The wedge block has the beneficial effects that the wedge block has the characteristic of low sound velocity and can be suitable for ultrasonic testing of low-sound-velocity materials; the integrally formed structure is simple, prevents liquid leakage, avoids contamination on the surface of a material under test, and eliminates bubble formation which interferes with a testing result; and the material itself has certain elasticity, which enables good coupling even when the surface of the material under test is uneven, thereby effectively improving the effect of ultrasonic flaw detection.

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.

The invention provides a dielectric property testing system loaded by a trapezoidal metal table, and belongs to the technical field of electromagnetic parameter testing of microwave and millimeter wave materials. According to the testing system, a trapezoid metal table is loaded in a regular rectangular resonant cavity, the trapezoid metal table and the resonant cavity wall jointly form a rectangular area for electric field energy convergence, the trapezoid metal table is located at the center of the regular rectangular resonant cavity, and the lower bottom edge of the trapezoid metal table coincides with the lower edge of one inner side wall of the rectangular resonant cavity; the upper bottom edge of the trapezoid metal table is parallel to the plane where the upper surface of the metal boss of the rectangular resonant cavity is located and is spaced from the plane where the upper surface of the metal boss of the rectangular resonant cavity is located, a rectangular area where an electric field is evenly distributed is formed, and the dielectric property of the rod-shaped material can be accurately tested through a resonant cavity perturbation method under the condition that the position of the tested material does not need to be accurately known.

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.

The present invention discloses a method and device for evaluating and optimizing the continuous extrusion processing characteristics of high-voltage cable insulation materials, comprising: continuously extruding the material to be tested as a melt, measuring and recording the inlet pressure P, mass growth rate w and diameter D' of the melt spline, and calculating the apparent shear viscosity η. a ; Calculate the export expansion rate δ; record the display curve η a (t) and δ(t), the time corresponding to the increase of the set percentage on the curve is taken as the starting time T of the cross-linking reaction X ; Select reference sample for testing, according to the η of the reference sample a (t) and δ(t) curves to determine the starting time T of the cross-linking reaction S According to T X and T S The index α is defined. The beneficial effects of the present invention are: uninterrupted melt extrusion is performed using an extruder in conjunction with a throttling device and a capillary die, the continuous testing time is unlimited, the cable insulation extrusion process is more realistically simulated, performance parameters that are more in line with reality are measured, experimental material consumption is saved, and the evaluation of material extrusion processing performance is more accurate and reliable.