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Long-distance laser stress detection method and detector

A stress detection and long-distance technology, which is applied in the measurement of the change force of the optical properties of the material when it is stressed, can solve the problems of detection difficulties, improve the spatial resolution, accurately distinguish the source of the signal, and realize the detection Effect

Inactive Publication Date: 2019-09-10
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large steel structures, this kind of contact detection is more difficult

Method used

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  • Long-distance laser stress detection method and detector
  • Long-distance laser stress detection method and detector
  • Long-distance laser stress detection method and detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The remote laser stress detection method provided in this embodiment includes the following steps:

[0035] Step S1, emitting two incident laser beams on the same optical path to irradiate the object to be detected.

[0036] refer to figure 1 As shown, the polarized incident laser is straightened, and then exits from the hand-held detector to the surface of the object to be measured. In general, linearly polarized light is incident on the surface of the object to be inspected, and when the incident angle is perpendicular to the incident angle, the reflected light returns from the original path. At this time, the polarization direction of the reflected light is rotated, and when the magnetization of the object to be detected is not very large, the polarization angle of the reflected light is linearly related to the magnitude of the magnetization M. In practice, it is difficult to ensure the detection Normal incidence of the laser. Generally there is an angle of incide...

Embodiment 2

[0046] Embodiment 1 provides a long-distance non-contact detection method, which is applied to a detector. This embodiment discloses the principle structure of the detector, such as Figure 4 As shown, it includes a semiconductor laser 101, a wavelength division multiplexer 102, a beam splitter 103, a collimator 104, an analyzer (there are two paths in the figure, marked 105 and 107 respectively) and a photoelectric probe (also two paths , marked 106 and 108 respectively), the semiconductor laser 101 emits laser light to the wavelength division multiplexer 102, and then forms two beams of polarized incident laser light through the beam splitter 103, and after the two beams of incident laser light are straightened by the collimator 104, Irradiate to the object to be detected, and the two reflected lasers returned from the object to be detected pass through the two analyzers, and then irradiate to the two photoelectric probes in one-to-one correspondence. The photoelectric prob...

Embodiment 3

[0048] Embodiment 3 discloses the principle structure of the detector. This embodiment discloses the specific results of a long-distance laser stress detector, including a housing 1, a handle 2 on the back of the housing 1, and a piece on the handle 3. The liquid crystal display screen 3 and the left, right, up movement and confirmation buttons are used for simple operation of the detector, and the buttons are uniformly marked as 4, and the semiconductor laser, wavelength division multiplexer, beam splitter, collimator, and polarizer and photoelectric probes are located within the housing. This hand-held design has a compact structure and is easy to carry, and can realize stress non-contact and fast scanning detection.

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Abstract

The present invention is applicable to the field of non-destructive testing, and provides a long-distance laser stress detection method and detector. The method utilizes respective polarization rotation angles of two vertical S polarized light and P polarized light to determine an incident angle, after the incident angle is determined, uses the Kerr deflection angle, to obtain intensity of magnetization of an object to be detected, then according to the principle of magnetic memory, and calculates stress and fatigue condition of the object to be detected. The method discloses a technology andan implementation method for detecting metal stress and fatigue damage by using surface magneto-optical Kerr effect, and uses non-contact of laser and the magneto-optical Kerr effect and Villar effectto achieve non-contact and fast scanning detection of the stress.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a long-distance laser stress testing method and a testing instrument. Background technique [0002] Stress detection is very important as stress is ubiquitous in metals. In some cases, the presence of stress concentrations leads to accelerated corrosion of components, also known as stress corrosion. In addition, in terms of structure, the presence of stress leads to fatigue damage. The structure may suddenly fail without warning, leading to major safety accidents. Regular testing of stress can prevent these accidents, so a convenient and fast on-site stress testing technology and products are needed. [0003] The existing on-site stress detection methods are basically divided into two categories: stress detection based on deformation and stress detection based on a certain physical quantity. The first scheme currently mainly includes the strain gau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/24
Inventor 盛林卢永雄黄威
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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