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Sensitivity method for ultrasonic detection of transient non-uniform temperature field inside an object

A technology of ultrasonic wave and temperature field, applied in the field of non-destructive temperature measurement, can solve the problems of real-time measurement error of response rate, temperature change of damaged structural materials, measurement error, etc.

Active Publication Date: 2017-12-01
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

However, the contact method has many limitations. For example, the surface-mounted sensor is greatly affected by the external environment such as heat flow; the perforated installation destroys the original shape of the structure and causes local temperature changes inside the material, which makes the measurement exist. Large error, and relatively slow response rate will also bring errors to real-time measurement, which limits its use conditions to a certain extent

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  • Sensitivity method for ultrasonic detection of transient non-uniform temperature field inside an object
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  • Sensitivity method for ultrasonic detection of transient non-uniform temperature field inside an object

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[0028] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0029] Such as figure 1 As shown, a sensitivity method for ultrasonic detection of transient non-uniform temperature field inside an object, comprising the following steps:

[0030] Step 1: Process a cuboid specimen that is the same as the base material of the measured object, and the length of the cuboid specimen in the measured direction is greater than one ultrasonic wavelength; and calibrate the relationship between the ultrasonic propagation time t and the temperature T in the cuboid specimen under different temperature conditions Relationship, the linear or quadratic function relationship T(t) is fitted by the least square method;

[0031] Step 2: Use a high ...

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Abstract

The invention discloses a method for detecting sensitivity of a transient non-uniform temperature field in an object by using ultrasonic waves. According to the correlation between propagation time and temperature of the ultrasonic waves in a base metal to be tested at different temperature, and overall measuring time obtained by an ultrasonic pulse echo method and the ultrasonic wave propagation time at the corresponding time, solving heat conduction problem based on a sensitivity equation, optimizing obtained equivalent temperature boundary conditions to minimize the difference value between the measured ultrasonic wave propagation time and the propagation time obtained by numerical simulation, heat conduction through direct problem solving can get the temperature distribution inside the specimen state at different times. Fast and accurate access the advantages of metal or metal alloy surface temperature and internal non-uniform temperature field. The method is used for real-time measurement of the metal or alloy surface temperature and the temperature of the internal transient non-uniform temperature field.

Description

technical field [0001] The invention relates to the technical field of non-destructive measurement of temperature, in particular to a sensitivity method for ultrasonic detection of a transient non-uniform temperature field inside an object. Background technique [0002] At present, the commonly used temperature measurement technology for metal or alloy objects is the contact type, that is, the temperature sensor is installed on the surface of the object to be measured by sticking or welding, or the temperature sensor is installed by drilling holes inside the structure. However, the contact method has many limitations. For example, the surface-mounted sensor is greatly affected by the external environment such as heat flow; the perforated installation destroys the original shape of the structure and causes local temperature changes inside the material, which makes the measurement exist. Larger errors, and relatively slow response rate will also bring errors to real-time measu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/22
Inventor 魏东石友安杜雁霞曾磊桂业伟肖光明刘磊杨肖锋
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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