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

A laser ultrasonic and non-destructive testing technology, which is applied in the direction of material analysis using sound waves/ultrasonic waves/infrasonic waves, measuring devices, and material analysis through optical means. Time and other issues, to achieve the effect of improving detection accuracy and detection efficiency

Inactive Publication Date: 2019-05-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 are

Method used

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

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Embodiment 1

[0042] Such as figure 1 and figure 2 As shown, this embodiment discloses a non-contact laser ultrasonic nondestructive testing system for arbitrary curved surfaces, the testing system mainly includes an ultrasonic excitation unit 2, an ultrasonic detection unit 9, a mechanical scanning unit 13, and a signal acquisition and processing unit 16. The ultrasonic excitation unit 2 is set as a pulsed laser 1 . The ultrasonic detection unit 9 includes a first mirror 3 , a second mirror 4 , an optical medium 5 , a continuous laser 6 , a beam splitter 7 , and a photodetector 8 . The mechanical scanning unit 13 includes a manipulator 10 and a controller 11 . The signal acquisition and processing unit 16 includes a signal conditioning device 14 , a data acquisition card 15 , and a computer 12 . In the present invention, the computer 12 of the manipulator 10 realizes the planning of the scanning path of any curved surface by optically exciting and receiving ultrasonic waves on the sam...

Embodiment 2

[0067] combine figure 1 and figure 2 As shown, this embodiment provides a non-contact laser ultrasonic non-destructive testing system and method for arbitrary curved surfaces, the purpose of which is to meet the testing requirements of existing complex structural parts, while improving the testing accuracy and efficiency. The non-contact laser ultrasonic nondestructive testing system for arbitrary curved surfaces consists of excitation unit, detection unit, scanning unit, acquisition and processing unit, including the following components:

[0068] Pulse laser 1, ultrasonic detection unit 9 composed of reflector, reflector, optical medium 5, continuous laser 6, beam splitter 7, photoelectric detector 8, composed of six degrees of freedom manipulator 10, controller 11, computer 12 The mechanical scanning unit 13 is a signal acquisition and processing unit 16 composed of a signal conditioning device 14 , a data acquisition card 15 and a computer 12 .

[0069] Fix the test obj...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N29/24
Inventor 纪轩荣刘旭曾吕明陈燕袁懋诞
Owner GUANGDONG UNIV OF TECH
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