A laser ultrasonic detection method and system for the internal temperature field of a uniform material component

Abstract

The invention relates to a laser ultrasonic detection method and system for temperature field in a homogeneous material component. The detection method comprises the steps that (1) the relationship between ultrasonic sound velocity and temperature in a homogeneous material is determined based on a calibration sample; (2) the thickness L of the homogeneous material component to be detected and the temperature T of the cold end are determined; (3) the ultrasonic transit time ttof in the homogeneous material component to be detected is acquired through laser ultrasonic measurement; (4) an ultrasonic temperature field is used to reconstruct a mechanism to acquire the internal temperature field distribution of the homogeneous material component to be detected. The detection method and system carry out fast, accurate, non-contact and high precision measurement on the internal temperature field of an object, can adapt to a harsh environment of high temperature, high pressure and strong corrosivity, and meet the needs of many complicated working conditions.

Description

technical field [0001] The invention relates to the technical field of non-contact detection of an internal temperature field of an object, in particular to a laser ultrasonic detection method and system for an internal temperature field of a uniform material component. Background technique [0002] For the measurement of the internal temperature of the object, the contact temperature measurement method is generally used, that is, the temperature sensor is in full contact with the object, and the heat balance between the two is achieved through heat exchange, thereby measuring the temperature value of the contact part of the object. However, when the above method measures the temperature of an object, there are many problems: (1) due to the need to wait for thermal equilibrium, the real-time response rate is relatively slow, and there is a certain delay; It directly affects the distribution of the temperature field inside the object, resulting in a large measurement error; (...

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Problems solved by technology

However, when the above method measures the temperature of an object, there are many problems: (1) due to the need to wait for thermal equilibrium, the real-time response rate is relatively slow, and there is a certain delay; It directly affects the distribution of the temperature field inside the object, resulting in a large measurement error; (3) In the case of a very harsh temperature measurement environment, due to the need for a certain period of time for heat balance, the high temperature resistance, high pressure resistance and corrosion resistance of the temperature measurement sensor The performance requirements of materials such as high-performance materials greatly increase the difficulty and cost of sensor manufacturing, and when the temperature is too low or too high for an instant, it is easy to affect the accuracy and life of the sensor; (4) only the local temperature of the contact position can be measured , it is impossible to obtain the temperature field distributed along the object structure direction (such as axial, radial or thickness direction)

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