Non-contact laser ultrasonic nondestructive testing system and method applicable to any curved surface

Abstract

The invention discloses a non-contact laser ultrasonic nondestructive testing system and method applicable to any curved surface. The system comprises a light source, a first reflector, a second reflector, an optical medium, a continuous laser device, a beam splitter, a photoelectric detector, a mechanical arm, a controller, a signal modulating device, a data collecting card and a computer. The method comprises that the light source emits pulse laser onto the surface of an object to be detected, ultrasonic waves produced based on the thermo-elastic mechanism penetrate through the optical medium between the two reflectors to cause change in the intensity of transmitted and reflected laser, the photoelectric detector measures the intensity of the laser and outputs signals, with assistance ofa mechanical scanning unit, scanning over of a region of interest is completed, during scanning, the output signals and scanning position data are synchronously collected, and through data treatment,three-dimensional distribution information of defects can be acquired. The non-contact laser ultrasonic nondestructive testing system and method applicable to any curved surface achieves ultrasonic wave excitation and detection with laser, thereby adapting to complex detecting conditions and achieving rapid, accurate and automatic non-destructive detection of defects of any curved surface part.

Description

technical field [0001] The invention relates to the technical field of ultrasonic nondestructive testing, in particular to a non-contact laser ultrasonic nondestructive testing system and method for arbitrary curved surfaces. Background technique [0002] Ultrasonic testing technology plays an important role in the field of industrial non-destructive testing due to its advantages of non-invasiveness, no radiation, real-time, low cost, and easy mobility. With the rapid development of industry, components with complex structures are widely used in industrial fields such as aerospace and ships. The most widely used in the field of industrial non-destructive testing is the use of conventional ultrasonic probes for ultrasonic transmission and reception. The use of these ultrasonic probes often requires contact with the workpiece to be tested or the use of couplant to achieve better detection results and detect larger areas. The down operation takes a long time, the efficiency is...

AI Technical Summary

Problems solved by technology

The most widely used in the field of industrial non-destructive testing is the use of conventional ultrasonic probes for ultrasonic transmission and reception. The use of these ultrasonic probes often requires contact with the workpiece to be tested or the use of couplant to achieve better detection results and detect larger areas. The down operation takes a long time, the efficiency is slow and the requirements for the operator and the detection environment are high

When detecting components with complex structures, the ultrasonic probe cannot detect parts with large curvature because it cannot closely fit the surface of the workpiece to be detected.

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