A non-destructive testing method for container inner wall bonding quality based on shear speckle interference

A bonding quality and non-destructive testing technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as the inability to detect the bonding quality of the inner wall of the container

Active Publication Date: 2019-04-05
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the bonding quality of the container inner wall based on shear speckle interference in view of the deficiency that the existing shear speckle technology cannot detect the bonding quality of the container inner wall

Method used

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  • A non-destructive testing method for container inner wall bonding quality based on shear speckle interference
  • A non-destructive testing method for container inner wall bonding quality based on shear speckle interference

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Embodiment 1

[0023] Embodiment 1: The non-destructive testing method for the bonding quality of the container inner wall based on shear speckle interference, the operation steps are as follows:

[0024] 1) First, transmit the laser light emitted by the single-mode laser (3) to the inside of the container (7) through a polarization-maintaining single-mode light-guiding fiber (1), and illuminate the area to be measured after uniform beam expansion;

[0025] 2) Using an imaging fiber bundle (2), put it into the container (7), and install an imaging lens at the inner end of the imaging fiber bundle container, and transmit the speckle image of the area to be measured to the other end of the fiber bundle outside the container;

[0026] 3) Using the Michelson interference optical path, the speckle image of the area to be measured transmitted through the imaging fiber bundle in step 2) passes through the Michelson optical path to form a pair of dislocation images, and the speckle interference image...

Embodiment 2

[0029] Embodiment two: refer to figure 1 with figure 2 , the present embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0030] The step 1) is to use a polarization-maintaining single-mode light-guiding fiber (1) to transmit the single-longitudinal-mode laser beam into the container (7) under the condition that the polarization of the laser remains unchanged. The light outlet of the light-guiding fiber (1) is equipped with a beam expander to uniformly expand the laser beam and illuminate the area to be measured.

[0031] Said step 2) is to introduce an imaging fiber bundle (2), the front end of the fiber bundle is equipped with a conventional optical lens, select a suitable lens according to the needs of working distance and detection area in actual engineering, and extend the end to the container (7) Inside; adjust the lens position to align with the area to be measured, and adjust the focal length and aperture of the lens at the sa...

Embodiment 3

[0036] figure 1 It is a schematic diagram of the optical path arrangement of the non-destructive testing method for the bonding quality of the container inner wall based on shear speckle interference. According to the schematic diagram, the shear speckle system based on the imaging fiber bundle is arranged, and the detection experiment is carried out on the aluminum-skinned aluminum honeycomb panel with built-in debonding defects. The detection process is as follows:

[0037]1) Firstly, the aluminum-skinned aluminum honeycomb panel is firmly fixed on the optical platform through the magnetic base, so as to minimize the influence of external vibration on the test results;

[0038] 2) A single longitudinal mode laser with a polarization-maintaining light-guiding fiber (1) is introduced, and the laser is transmitted through the light-guiding fiber (1) and uniformly expanded by the front-end beam expander to illuminate the aluminum-skinned aluminum honeycomb panel;

[0039] 3) An...

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Abstract

The present invention relates to a shearing speckle technology for container inner wall adhesion quality detection based on an imaging optical fiber bundle. According to the method, with a polarization-maintaining light guiding optical fiber, an imaging optical fiber bundle and the existing Michelson interferometer, the adhesion quality detection on the container interior adhesion structure is achieved, and the problem that the traditional shearing speckle technology cannot detect the type of the structure is solved; and with the technology, the limitation of the Michelson interferometer on the detection area is broken through, the single effective detection area of the shearing speckle technology is increased, and the shearing speckle technology can perform the rapid large-area nondestructive detection at the short working distance.

Description

technical field [0001] The invention relates to a non-destructive detection method for the bonding quality of the inner wall of a container based on shear speckle interference, and belongs to the field of photoelectric detection. Background technique [0002] In the past two decades, various optical interferometry techniques, such as speckle interferometry, moiré interferometry, and shear speckle interferometry, have become important methods for deformation field measurement. They are based on the principle of optical interference, have high sensitivity, and can measure the displacement and displacement derivative of the surface of the object under force. Because it has the characteristics of full-field measurement, simple optical path, convenient adjustment, and low environmental requirements, it is widely used in various precision measurements. [0003] Traditional optical interferometers usually give measurement results in the form of interference fringe patterns. Due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
CPCG01N21/88G01N21/8806
Inventor 张东升刘斌王福红
Owner SHANGHAI UNIV
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