Ultrasonic detecting device for building steel structure

Abstract

The invention discloses an ultrasonic detecting device for a building steel structure. The ultrasonic detecting device comprises an excitation system and an ultrasonic receiving system, wherein the excitation system comprises a high-energy pulse laser unit and a spherical lens; the high-energy pulse laser unit is used for generating high heat on the detected building steel structure, so that a pulse signal is generated; a laser beam generated by the high-energy pulse laser unit is focused to the surface of the building steel structure through the spherical lens to form a point source; the ultrasonic receiving system comprises an optical interferometer, an photoelectric detector and a signal amplifying processing circuit; when laser is detected to irradiate the surface of the building steel structure, ultrasonic vibration modulates reflected light of the building steel structure, so that ultrasonic vibration information is converted into light information; the optical interferometer is used for measuring small optical path or light frequency changes, so that ultrasonic vibration information carried in the light signal is demodulated; the photoelectric detector is composed of a photoelectric diode, and is used for converting an ultrasonic signal in the light signal into an electric signal.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to an ultrasonic testing device for building steel structures. Background technique [0002] Nondestructive Testing (Nondestructive Testing, NDT) is a comprehensive application technology involving multiple disciplines. It uses a variety of physical principles and chemical phenomena on the premise of not damaging the performance of the object to be tested, and tests various engineering materials and parts. , Structural components are effectively inspected and tested to evaluate their continuity, integrity, safety reliability and certain physical properties. Non-destructive testing technology is an indispensable and effective tool for the development of modern industry. To a certain extent, it reflects the level of industrial development of a country, and its importance has been widely recognized worldwide. [0003] As one of the five conventional non-destructive tes...

AI Technical Summary

Problems solved by technology

For industries such as steel manufacturing, the working temperature is often above 1000°C, so the traditional ultrasonic testing method cannot realize online testing

During the detection process of the current building steel structure, the internal structure cannot be detected in a timely and effective manner, and the detection is inconvenient

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