A Method for Measuring the Internal Temperature Field of a Structure Based on Phase Detection
A technology of internal temperature and measurement methods, applied to thermometers, thermometers, and measuring devices that change physically/chemically, can solve problems such as temperature measurement errors, temperature changes, and damage to the original shape of the structure, and achieve high measurement resolution. The effect of low hardware performance
Active Publication Date: 2018-03-27
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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This destructive detection method will destroy the original shape of the structure to a certain extent, and will cause local temperature changes inside the material, resulting in large errors in temperature measurement.
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[0023] The present invention will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.
[0024] Such as figure 1 In the ultrasonic temperature measurement system shown, (1) FPGA generates digital signals through the control signal generator, and after D / A conversion, filtering and amplification, it drives the ultrasonic transducer to send out ultrasonic signals; (2) the ultrasonic transducer will receive The received sound wave is converted into a voltage signal, and the electrical signal is amplified; (3) The measurement circuit of the integer multiple wavelength part can use an envelope peak detection circuit or a latch / tracking counter circuit, etc. (4) The data collected by the A / D sampling module is transmitted to the host computer through the FPGA chip for phase estimation of non-integer multiple ...
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Abstract
The invention discloses a structure internal temperature field measuring method based on phase detection. Time information is transmitted by the supersonic wave included in the sound wave phase difference between the transmitted wave and the received echo reflected by an object to be measured, for the reverse problem of heat conduction, the phase difference obtained through measurement is substituted into the deformation form of a thermoacoustic equation, and the ultrasonic transmission time after being converted by means of the time-phase relationship is substituted into the traditional form of the thermoacoustic equation, after the equivalent heat boundary condition is obtained through the calculation based on the reverse problem of heat conduction, the temperature filed distribution states at different time in the measured structure can be obtained through the solution of the direct problem of heat conduction. The measuring method can meet the requirement of the high-precision measurement of the non-uniform temperature field inside a measured solid on the basis of a conventional phase detection apparatus and a hardware circuit.
Description
technical field [0001] The invention relates to the technical field of ultrasonic detection, in particular to a method for measuring a temperature field inside a structure based on phase detection. Background technique [0002] The currently widely used internal temperature measurement technology of solid structures still mainly relies on perforated installation, that is, temperature sensors such as thermocouples are pre-embedded inside the structure. This destructive detection method will destroy the original shape of the structure to a certain extent, and will cause local temperature changes inside the material, resulting in large errors in temperature measurement. [0003] Ultrasonic temperature measurement is a temperature measurement technology based on the correlation between ultrasonic propagation velocity and medium temperature to achieve non-destructive and high-precision detection of the internal temperature of the medium. However, its measurement objects are mainl...
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IPC IPC(8): G01K11/22
CPCG01K11/22
Inventor 魏东石友安杜雁霞胡斌桂业伟曾磊肖光明杨肖峰
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT