Laser ultrasonic nondestructive detection system based on double-wave mixing

A laser ultrasonic and non-destructive testing technology, which is applied in the direction of measuring device, phase influence characteristic measurement, and material analysis through optical means, can solve the problem of small thermoelastic effect signal amplitude, etc., and achieve the goal of improving anti-interference ability and avoiding interference Effect

Active Publication Date: 2020-08-11
NAT INST OF METROLOGY CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although laser ultrasound has many advantages that traditional technologies do not have, there are still many problems. The most urgent problem to be solved is that the signal amplitude generated by the thermoelastic effect is small.

Method used

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  • Laser ultrasonic nondestructive detection system based on double-wave mixing
  • Laser ultrasonic nondestructive detection system based on double-wave mixing
  • Laser ultrasonic nondestructive detection system based on double-wave mixing

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] like figure 1 Shown is a schematic diagram of the system architecture. In this implementation example, the system includes a laser excitation module, a sample to be tested, a laser ultrasonic detection module, a host computer acquisition control module and a scanning mechanism;

[0023] The laser excitation module includes a pulsed laser 1 , a mirror 2 , a mirror 3 and a cylindrical mirror 4 . The pulsed laser 1 generates high-energy repetitive laser pulses and enters the cylindrical mirror 4 through the reflector 22 and the reflector 3, so that the point light source becomes a line light source and the intensity of the ultrasonic signal is increased.

[0024] The line light source is incident on the surface of t...

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Abstract

The invention discloses a laser ultrasonic nondestructive detection scanning system based on double-wave mixing. The system comprises a laser excitation module, a detected sample (5), a laser ultrasonic detection module (6), an upper computer acquisition control module (7) and a scanning mechanism (8), wherein the laser excitation module comprises a pulse laser (1), a reflector (2), a reflector (3) and a cylindrical mirror (4). According to the laser ultrasonic nondestructive detection system based on double-wave mixing, the anti-interference capability of the system is improved by adopting adigital demodulation mode, and meanwhile, multiple paths of signals are better synchronized; the linearly polarized light can effectively control the light intensity of the reference light and the signal light by using the polarization beam splitter, so that the interference of the reflected light on the laser source is avoided.

Description

technical field [0001] The invention relates to the field of ultrasonic nondestructive testing, in particular to a laser ultrasonic nondestructive testing system based on double-wave mixing. Background technique [0002] Ultrasonic non-destructive testing refers to the application of ultrasonic testing methods to test various materials without destroying the material structure or characteristics of the tested object, and is used to evaluate the safety and effectiveness of these materials. Traditional ultrasonic testing methods usually use piezoelectric transducers for contact testing. However, this method cannot be used for non-destructive testing in harsh environments such as high temperature and high pressure, and the detection efficiency for irregular structures is low. Laser ultrasound makes up for these deficiencies well due to its advantages of non-contact and high spatial resolution. [0003] When performing laser ultrasonic non-destructive testing, a pulsed laser is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/45
CPCG01N21/1702G01N21/1717G01N21/17G01N21/453G01N2021/1706G01N2021/1725G01N2021/1774
Inventor 邢广振杨平王敏钱飞明王珂
Owner NAT INST OF METROLOGY CHINA
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