123 results about "Material under test" patented technology

The invention relates to a combined load mode mechanical-electrical and thermal-magnetic coupling material performance in-situ test instrument and method, and belongs to the field of precise scientific instruments. The test instrument comprises three parts: namely a combined load-multi-physical field loading test platform, an in-situ monitoring platform and a vibration-isolating base, wherein the vibration-isolating base is mainly used for supporting the combined load-multi-physical field loading test platform and the in-situ monitoring platform, and provides a positioning service for installation of the platforms and effective vibration isolating treatment for various precise driving loading elements, detecting elements and in-situ monitoring elements; the in-situ monitoring platform realizes real-time dynamic and in-situ monitoring on micro deformation, injury mechanism, microstructure changes and property evolution of a material sample under the combined load condition by precisely adjusting the position and posture of various monitoring modules. The combined load mode mechanical-electrical and thermal-magnetic coupling material performance in-situ test instrument has the following advantages: the structure is miniaturized and lightened in weight, and the instrument body can be placed in an optionally equipped vacuum cavity, so that testing environments like low pressure, vacuum and inert gases can be provided for the material sample to be tested, and the practicability is high.

A system of using an interferometer, in combination with a laser, and a detector to determine absorptive characteristics of a material under test. The operation of the interferometer allows for determination of the wavelength of the laser beam and for determining relative changes in the wavelength of the laser beam. A method for using a laser source and an interferometer to determine characteristics of a material under test in accordance with the present invention is also provided.

The invention relates to a thermal-force coupling fatigue test device and method, belonging to the field of metal material performance test and analysis. The device comprises a tested material test sample, a cold-thermal fatigue system and a stress fatigue system, wherein the test sample comprises a clamping section, a test section and a transition section; the cold-thermal fatigue system comprises a high frequency induction coil, a rotary seal device, a flow pump, a temperature sensor, a heating power supply, a cooling medium pipeline and a control system; and the stress fatigue system mainly comprises a driving rotating fixture, a driven rotating fixture, a transmission gear, a motor and a motor control system. The method comprises the following steps of: connecting and fixing the test sample with the cold-thermal fatigue system and the stress fatigue system, and carrying out cold-thermal fatigue while stress fatigues under different stresses are carried out to obtain a curve which shows variation of stress fatigue life along with cyclic stress; and adjusting parameters of the cold-thermal fatigue, thus influence of cold-thermal fatigue temperature to fatigue limit can be obtained.

A material, such as a fiber composite material, has embedded inside at least one, preferably more, surface acoustic wave filters of piezoelectric material for receiving testing energy in a wireless manner and for retransmitting a material quality signal in a wireless manner which is evaluated in a system that has a wireless transmitter for sending testing energy into a material and a wireless receiver for receiving the material quality signal which is then processed and evaluated by a respective processor of the testing system. An output of the processor provides information regarding the nature and quality of the material tested and of the presence and location of any material faults that may be displayed on display screen.

Described are methods for pressurizing elastic support structures or balloons in sensor probes used for the inspection of components having areas of limited access. When inflated, the balloons press flexible sensors against the surface of the material under test. When deflated, the balloons permit easier insertion of the probes into the component and reduce the mechanical stresses on the sensors, thereby extending the sensor lifetime. By sequentially partially inserting the sensor into a limited access area from either side of the limited access area and scanning in opposite directions, the entire surface of the test material can be inspected.

The present invention discloses a nondestructive testing method for metal material fracture toughness, and the method mainly includes: performing Charpy impact tests to samples of different damage degrees to obtain the brittle transition temperatures of the samples; performing ultrasonic secondary harmonic measurement to the samples of each type of the damage degrees to obtain the second harmonic ultrasound nonlinearity parameter normalized value of the samples of the type of the damage degree; obtaining the fracture strength factor of the samples of each type of the damage degrees via the fracture toughness tests or by reference of fracture empirical formulas, and making a calibration curve for nondestructive testing fracture toughness; performing ultrasonic secondary harmonic measurement to a metal material under test to obtain the second harmonic ultrasound nonlinearity parameter normalized value of the metal material under test; and obtaining the fracture toughness value of the metal material under test by using the calibration curve. The nondestructive testing method for metal material fracture toughness of the invention is capable of performing testing and evaluation of material fracture toughness of in-service metallic components, and providing a reliable basis for the security service of the metal materials.

The invention provides a system and method of testing complex dielectric constant of a material based on a gradient coaxial resonator. The system comprises the gradient coaxial resonator and a coupling device. The method comprises the steps: 1) testing and recording resonant frequency f0 and quality factor Q0 in a corresponding cavity working mode when no sample is loaded; 2) measuring diameter DSand thickness dS of a sample under test, placing the sample in a sample area, and testing and recording resonant frequency fS and quality factor QS in the corresponding cavity working mode when the sample is loaded; 3) using resonator perturbation theory to calculate complex dielectric constant of the material under test. The system and method have the advantages that high-precision testing of complex dielectric constant at normal temperature is achieved for a microwave dielectric material, required cavity size and sample size for low frequency testing can be reduced, a sealed-bottom tube clamp can also be used to test the complex dielectric constant of liquid and powdery materials.

Various embodiments include solutions for in-process material characterization. Various particular embodiments include a computer-implemented method including: providing instructions for transmitting oscillating electromagnetic field signals to a material under test (MUT); obtaining a return signal associated with the transmitted oscillating electromagnetic field signals; comparing the return signal with the oscillating electromagnetic field signals to determine a difference in an aspect of the return signal and the aspect of the oscillating electromagnetic field signals; comparing the difference in the aspect to a predetermined threshold; and determining a characteristic of the MUT based upon the compared difference.

The invention discloses a method and a device for measuring material deformation based on automatic tracking of laser marks. According to the method, laser output by a laser passes through a division plate to form laser marks with different patterns, is ejected to a pentagonal prism and irradiated on a mark line of a material to be tested (namely a sample) after being reflected by the pentagonal prism; a servo motor and a motor controller drive the pentagonal prism to rotate, so that laser marks automatically track the changes of the sample mark line during deformation of the material; imagesof the laser marks and the sample mark line are acquired by a charge coupled device (CCD) in real time and input to a computer; and the deformation of the sample is obtained after digital image processing. The device has high anti-interference capability, and is low in cost and easy for practical application. Moreover, the measurement precision of the material deformation can reach over 0.02 percent.

A system to perform measurements on liquids, meat, viscous sugar or starch-based materials, and other foodstuffs using air-coupled ultrasound is provided. The technique uses ultrasonic transducers (advantageously capacitive transducers with polymer membranes), to generate ultrasonic signals in air, and to receive these signals after they have passed through the material under test. An ultrasonic pulse-compression process is then applied to increase the sensitivity of signals transmitted through the materials.

A method for testing a printed circuit board to determining the dielectric loss associated with the circuit board material relative to a standard. Dielectric losses in the material generate heat when a high frequency electronic signal, such as a microwave frequency signal, is communicated through a microstrip that is embedded within the printed circuit board. The temperature or spectrum at the surface of printed circuit board is measured and compared against the temperature or spectrum of the standard to determine whether the material under test is acceptable. While various temperature measurement devices may be used, the temperature is preferably measured without contacting the surface, such as using an infrared radiation probe.

A light source is gated ON and OFF in response to a pulsed signal. Photo emissions from the light source are coupled to a material under test. Resonant fluorescent emissions from the material are coupled to a photodiode. Current from the photodiode is coupled into an amplifier system comprising a first and second amplifier stages. The first amplifier stage is gated to a low gain when the light source is turned ON and the gain is increased when the light source goes from ON to OFF. The second amplifier stage has digitally programmable offset and gain settings in response to control signals. The output of the second amplifier stage is digitized by an analog to digital converter. A controller generates the pulse control signal and the control signals.

A method and apparatus are provided for detecting strain, stress, fatigue and incipient failure in materials. A detector (e.g., a photomultiplier tube) is used to detect photonic emissions from a material under test. Data based on the detected photonic emissions is displayed in real time so as to enable real time analysis of the data in determining strain, stress, fatigue and/or incipient failure.

Various embodiments include planar sensor arrays for use in determining characteristics of a material under test (MUT). The planar sensor arrays can include a set of electrodes positioned to enhance a depth and clarity of detection into the material under test. Some embodiments include an electromagnetic sensor array having: a first set of two rectilinear electrodes, positioned opposed to one another across a space; and a second set of two rectilinear electrodes, positioned opposed to one another across the space, the second set being off-set from the first set, wherein the first set and the second set are configured to detect an electromagnetic impedance of the MUT.

The invention discloses a detection method of the components of the gassing pollution of a non-metallic material used in a satellite, which is characterized in that the invention designs a sampling and sample storing system that can effectively detect the components of the gassing pollution of the non-metallic material used in the satellite under the simulated space environment. When in testing process, a sample is put in the sampling system, and the material under test completely generates gassing release action as fully as possible by the sample storing system, thus the detection system can fully detect the components of the gassing pollution. The detection method realizes the analysis of the gassing pollution from the qualitative aspect, overcomes single analyzing the gassing pollution from the quantitative pollution aspect in existence, effectively and deeply analyzes the gassing pollution of the non-metallic material used in the satellite and provides reference data for screening and processing the non-metallic material used in the satellite and carries out control and protection of satellite pollution from the aspect of pollution source.

The invention relates to a heat conductivity coefficient and heat diffusivity transient body heat source measuring method, and aims to solve the problems that an existing steady-state method needs addition of a heat protection structure, consequently, a device is complicated in structure and large in size, the shape and the volume effect of a heating probe cannot be accurately considered in a measuring model of non-steady state methods such as a planar heat source method, and measuring errors are large. The measuring method particularly includes the steps: first, building an excess temperature-time database of the heating probe with different thermophysical parameters; second, building a machine learning model of the thermophysical parameters and transient temperature rise of the heating probe based on the database built in the first step; third, acquiring change data of temperature rise of the heating probe with the passage of time by experimental measurement; fourth, calculating theheat conductivity coefficient and the heat diffusivity of a measured material according to the machine learning model built in the second step and the change data of temperature rise of the heating probe with the passage of time. The measuring method is used for the field of thermophysical parameter measurement of the material.

X-ray imaging apparatus,which includes an x-ray detector. The x-ray detector comprises a member configured to convert incident x-ray wavelength photons into emitted visible wavelength photons, a position for a material under test, an x-ray source, and a structure configured to perturb an x-ray energy spectrum, each lying on a common axis. The x-ray source is arranged to direct an x-ray energy spectrum along the common axis to impinge upon the member, the structure configured to perturb the x-ray energy spectrum, and positioned material under test. The structure lies between the x-ray source and the member to one side of the position for material under test intersecting the common axis, and the said structure comprises at least three adjacent regions, each region different to immediately adjacent regions and configured to perturb the x-ray energy spectrum differently.

A dielectric sensing method and apparatus are provided for detection and classification of chemical and biological materials. Resonance patterns of a sample within a resonator are detected for identifying a shift in resonance frequency and a change of line width before and after introduction of the sample. The identified shift in resonance frequency and change of line width are used for determining a complex dielectric constant of the sample for the material detection and classification. A degree of selectivity at any excitation frequency is enabled for the dielectric sensing method from the manner in which the complex dielectric constant of a material affects the resonance pattern of the resonator with respect to shift in resonance frequency and the change in line width. By selecting the excitation frequencies to generally correspond to one of the resonance frequencies of the sample material under test, the degree of selectivity and the sensitivity of detection are enhanced.

The apparatus and methods disclosed may be utilized for the scratch/mar testing of various materials and components that provide improved correlation between the simulated damage modes and those reasonably expected to be encountered by the final components. The apparatus includes both a fixture configured for receiving and holding the material under test (MUT) and a tool holder that is arranged and configured for supporting and holding a variety of test tools in one or more orientations relative to the MUT. The tool holder and/or the fixture are, in turn, supported by one or more assemblies arranged and configured for bringing the tool into contact with the MUT and providing for movement of the tool relative to the MUT. The apparatus is then used for collecting data from a series of tests that can be used to compare the performance of different MUT compositions and configurations.

An apparatus for testing transmittance includes a sample unit to position a material under test. The material under test is disposed between respective flat surfaces of a first mount and a second mount, which are positioned in the sample unit for a test round. The sample unit defines a first volume and a second volume, wherein arc shapes, variously formed by respective surfaces of the first and second volume, conform to an imaginary circle. During the test round, a rotation unit successively changes an angular position of the MUT relative to a light source. A light detector receives light from the light source which has been transmitted through the first volume, the MUT and the second volume. Based on the received light, a transmittance signature of the MUT is determined for a range of incidence angles.