Ultrasound-based non-destructive measurement method of intensity and position of internal heat source

A technology of heat source intensity and measurement method, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, instruments, and analysis materials, etc., which can solve problems such as height instability, unsatisfactory stability, and difficulty in meeting expectations in stability and accuracy. Achieve the effects of simplified measuring device, large measuring range and easy operation

Active Publication Date: 2019-03-15
CHINA SPECIAL EQUIP INSPECTION & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The identification of internal heat sources, especially the simultaneous identification of intensity and position, is a highly ill-posed problem, that is, neither the uniqueness nor the stability of the solution satisfies
Although there have been a lot of reports on the internal heat source identification problem, most of the research focuses on solving the heat source inverse problem through numerical algorithms, and the stability and accuracy of the solution are not easy to meet expectations, and most of the research methods have not been experimentally verified. At the same time, some methods The limitation is that it still needs to detect the temperature information of a few internal points

Method used

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  • Ultrasound-based non-destructive measurement method of intensity and position of internal heat source
  • Ultrasound-based non-destructive measurement method of intensity and position of internal heat source
  • Ultrasound-based non-destructive measurement method of intensity and position of internal heat source

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Effect test

Embodiment 1

[0030] The measured component is a cuboid with a length of 0.1m, and a single point heat source Q=1e+6W / m is set at the center 3 , which is theoretically approximated as a one-dimensional heat transfer problem with an internal heat source.

[0031] Step 1: Obtain the correlation between the ultrasonic propagation velocity V in the tested component and the temperature T under different temperature conditions, and fit the relationship between V and T V(T), where T is the condition that the overall temperature of the tested piece is consistent The temperature value under;

[0032] Step 2: Select the length direction as the measured direction, set it as the x direction, L is the length of the tested piece along the measured direction, L=0.1m; install heat insulation along the length direction except the upper and lower surfaces Layer, heating from one end of the member under test at x=0 along the direction of the test direction x, until the temperature of the heated end at x=0 of...

Embodiment 2

[0045] Embodiment 2: The measured component is a cuboid, the length is 1m, and the width is 0.1m. Two point heat sources are set, and the length direction is set as the x direction, wherein the central position of the cuboid is set at x=0.5m and y=0.05m. Point heat source Q=1e+6W / m 3 , set point heat source Q=1.2e+6W / m at the position 0.3m away from the end face of x=0, that is, x=0.3m, y=0.05m 3 . Set the width direction, that is, the y direction as the detection direction, heat from one end of the component under test at y=0, place the ultrasonic probe on the end face of y=1m, excite pulsed ultrasonic waves in the vertical incidence mode, and move the ultrasonic probe along the x direction , carry out stepping ultrasonic scanning detection, and follow the above steps 1 to 6 in turn, based on the change of the measured bottom echo propagation time, by solving the heat conduction inverse problem of the heat source, the intensity and position of the two internal heat sources a...

Embodiment 3

[0046] Embodiment 3: Same as the measured component of Embodiment 1, a single point heat source Q(t)=133928.57t is set at the central position 2 +1848214.29t+9250000. Place the ultrasonic probe on the end face of one end where x=L, and excite the pulsed ultrasound in the way of vertical incidence, follow the steps 1 to 6 in sequence, based on the change of the propagation time of the bottom surface echo, and solve the heat conduction inverse problem of the heat source, obtain the following Time varies the strength of the internal heat source as figure 2 shown. Comparing the direct value with the measured value at 6 measuring points, the average error is less than 1.39%.

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Abstract

The invention provides an ultrasound-based non-destructive measurement method of the intensity and position of an internal heat source. The method is characterized in that the time delay characteristic and the boundary temperature variation of ultrasonic waves during the internal propagation in a structure are simultaneously considered, and the solution is performed combining with inverse heat conduction problems, so as to perform non-destructive and fast measurement on the intensity and position of the heat source, which can change along with time in the structure. In the invention, no temperature information of internal points of the structure is needed to be acquired, so that measuring devices are simplified, and the operation is easy and convenient; and compared with an infrared detection technique of the internal heat source, the method disclosed by the invention can more effectively detect the intensity and position of the internal heat source of the structure, and has the advantages of high measuring speed, large measuring range and the like.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection, and in particular relates to an ultrasonic-based nondestructive measurement method for the intensity and position of an internal heat source. Background technique [0002] The measurement of heat sources inside structures has important applications in areas such as non-destructive testing, microbial fermentation, ammunition, and food storage. For example, problems such as tumor diagnosis and treatment in medicine can essentially be attributed to the problem of identifying the location of heat sources inside objects. The identification of internal heat sources, especially the simultaneous identification of intensity and location, is a highly ill-posed problem, that is, neither the uniqueness nor the stability of the solution is satisfied. Although there have been a lot of reports on the internal heat source identification problem, most of the research focuses on solving the heat sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
CPCG01N29/07G01N2291/011
Inventor 胡斌魏东石友安刘磊杨肖峰寿比南桂业伟赵凡
Owner CHINA SPECIAL EQUIP INSPECTION & RES INST
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