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Laser ultrasonic nondestructive testing equipment and method based on shear speckle interference

A laser ultrasonic and non-destructive testing technology, applied in measuring devices, material analysis by optical means, instruments, etc., can solve the problems affecting the signal strength of laser ultrasonic flaw detection, equipment interference, large size, etc. Large field, high sensitivity effect

Inactive Publication Date: 2022-02-08
宝宇(武汉)激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used laser ultrasonic equipment consists of two parts: laser excitation and laser interference receiving. The equipment is large in size, and there is interference between the equipment, which affects the signal strength of laser ultrasonic flaw detection.

Method used

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  • Laser ultrasonic nondestructive testing equipment and method based on shear speckle interference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, a laser ultrasonic nondestructive testing equipment based on shear speckle interference, including:

[0046] Laser 1, beam splitting device 2, vibrating mirror 3, beam expander 4, shearing device 5, CCD camera 6 and signal processor 7;

[0047] The laser 1 is used to emit pulsed laser;

[0048] The beam splitting device 2 is arranged at the exit end of the laser 1. The beam splitting device 2 has two exit ends. The pulsed laser light emitted by the laser 1 enters the beam splitting device 2 and is divided into two beams by the beam splitting device 2. shoot out from one exit end;

[0049] The vibrating mirror 3 is arranged at one of the exit ends of the beam splitting device 2, and the pulse laser emitted from one of the exit ends of the beam splitting device 2 will enter the vibrating mirror 3, and then the vibrating mirror 3 converts the incoming point laser light into The area array laser is irradiated on the workpiece to make the workpi...

Embodiment 2

[0057] Such as figure 1 As shown, the present embodiment is a further optimization carried out on the basis of embodiment 1, which is specifically as follows:

[0058] The laser ultrasonic nondestructive testing equipment based on shear speckle interference also includes an optical switch 8, which is arranged between the output end of the beam splitting device 2 and the vibrating mirror 3, and the optical switch 8 is used to realize the on-off of light, thereby controlling The light is emitted at point intervals, and the sensitivity of the optical switch 8 should be above 1 ms.

Embodiment 3

[0060] Such as figure 1 As shown, the present embodiment is a further optimization carried out on the basis of embodiment 1 or 2, which is specifically as follows:

[0061] The beam splitting device 2 includes: a beam splitting prism 210 and a mirror 220;

[0062] The beam splitting prism 210 is arranged at the output end of the laser 1, and the beam splitting prism 210 has two output ends;

[0063] The pulsed laser light emitted by the laser 1 enters the beam-splitting prism 210, and is divided into two beams by the beam-splitting prism 210, and then emitted from the two output ends respectively;

[0064] The reflector 220 is arranged at one of the exit ends of the beam splitting prism 210;

[0065] The vibrating mirror 3 and the beam expander 4 are respectively arranged at the other exit end of the beam splitting prism 210 and the reflection end of the mirror 220;

[0066] The pulsed laser emitted from one of the output ends of the beam splitting device 2 changes directio...

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Abstract

The invention relates to laser ultrasonic nondestructive testing equipment based on shear speckle interference, comprising: a beam splitter arranged at the exit end of a laser and having two exit ends; a galvanometer arranged at one emergent end of the beam splitting device; a beam expander arranged at the other emergent end of the beam splitter; a shearing device used for obtaining diffused light generated on the surface of the workpiece; a CCD camera arranged at the emergent end of the shearing device; and a signal processor is electrically connected with the CCD camera, the laser and the galvanometer. Displacement measurement is carried out by utilizing shear speckle, a measured displacement derivative is strain, defect detection is realized, and the method is relatively sensitive to stress concentration positions and high in sensitivity; laser excitation and laser interference use the same light source, so that the size and weight are greatly reduced; the CCD camera is adopted, so that the field of view is large; and the two interference fields formed by the shearing device basically share the same optical path, so that the interference of factors such as external environment vibration and air disturbance is avoided, and the requirement of vibration isolation is met.

Description

technical field [0001] The invention relates to the technical field of laser nondestructive testing, in particular to a laser ultrasonic nondestructive testing device and method based on shear speckle interference. Background technique [0002] Laser ultrasound is a non-contact, high-precision, non-destructive new ultrasonic testing technology. It uses laser pulses to excite ultrasonic waves in the workpiece to be detected, and uses laser beams to detect the propagation of ultrasonic waves, thereby obtaining workpiece information, such as workpiece thickness, internal and external Surface defects, material parameters and more. The currently used laser ultrasonic equipment consists of two parts: laser excitation and laser interference receiving. The equipment is large in size, and there is interference between the equipment, which affects the signal strength of laser ultrasonic flaw detection. Contents of the invention [0003] The technical problem to be solved by the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/01
CPCG01N21/1702G01N21/01
Inventor 李震刘鉴霆周永祥王亦军
Owner 宝宇(武汉)激光技术有限公司