System and method for three-dimensional characterization of metal microcracks based on reflective laser thermal imaging

Abstract

The invention relates to metal surface microcrack characterization technology, in particular to a three-dimensional characterization system and method for metal microcracks based on reflective laser thermal imaging. The invention solves the problem of incomplete characterization results of traditional metal surface micro-crack characterization techniques. A three-dimensional characterization system for metal microcracks based on reflective laser thermal imaging, including a metal workpiece to be tested, a Fourier lens, a semiconductor laser, a computer, a signal generator, and an infrared thermal imaging camera; where the emitting end of the semiconductor laser is facing the Fourier The incident end of the lens; the exit end of the Fourier lens is facing the front of the metal workpiece to be tested; the signal output end of the computer and the signal output end of the signal generator are connected to the signal input end of the semiconductor laser; the detection end of the infrared thermal imager Diagonal to the front of the metal workpiece to be tested. The invention is applicable to the characterization of micro-cracks on the metal surface.

Description

Three-dimensional characterization system and method of metal microcracks based on reflection laser thermal imaging technical field The present invention relates to metal surface micro-crack characterization technology, specifically a kind of metal surface based on reflective laser thermal imaging Microcrack three-dimensional characterization system and method. Background technique Metals are widely used in aero-engines because of their advantages such as high strength, good heat resistance, and strong corrosion resistance. In the manufacture of machines, automobiles, ships, etc. In the process of using metal workpieces, it is easy to appear due to fatigue aging or harsh environment. Surface micro-cracks, thus affecting the mechanical properties, vibration noise, and service life of the metal workpiece. Therefore, in order to ensure the Mechanical properties, vibration and noise, and service life require surface micro-crack characterization of metal workpieces. Ho...

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Problems solved by technology

[0003] In order to solve the problem of incomplete characterization results of traditional metal surface microcrack characterization techniques, the present invention provides a three-dimensional characterization system and method for metal microcracks based on reflective laser thermal imaging

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