Container inner wall adhesion quality nondestructive detection method based on shearing speckle interferometry

A bonding quality and non-destructive testing technology, applied in 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: 2017-04-26
SHANGHAI UNIV
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  • Abstract
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  • 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 spe

Method used

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  • Container inner wall adhesion quality nondestructive detection method based on shearing speckle interferometry
  • Container inner wall adhesion quality nondestructive detection method based on shearing speckle interferometry

Examples

Experimental program
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Embodiment 1

[0023] Embodiment 1: This non-destructive inspection method for the adhesion quality of the inner wall of a container 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 guide fiber (1), and illuminate the area to be measured after uniformly expanding the beam;

[0025] 2) Use 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 to 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) forms a pair of misaligned images after passing through the Michelson optical path. The speckle interference im...

Embodiment 2

[0029] Example 2: Reference figure 1 with figure 2 This embodiment is basically the same as the first embodiment, 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 to the inside of the container (7) under the condition that the laser polarization remains unchanged. The light outlet of the light guide optical fiber (1) is equipped with a beam expander to uniformly expand the laser beam and illuminate the area to be measured.

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

Embodiment 3

[0036] figure 1 It is a schematic diagram of the optical path arrangement of the non-destructive inspection method for the adhesion quality of the inner wall of the container based on the shear speckle interference. According to the schematic diagram, the shearing speckle system based on the imaging fiber bundle is arranged and used to test the aluminum skin aluminum honeycomb panel with built-in debonding defects. The detection process is:

[0037] 1) First, the aluminum skin aluminum honeycomb panel is firmly fixed on the optical platform through the magnetic table base to minimize the impact of external vibration on the test results;

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

[0039] 3) Assemble an optical lens with a focal length of ...

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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 method for non-destructive detection of the adhesion quality of the inner wall of a container based on shear speckle interference, which belongs to the field of photoelectric detection. Background technique [0002] In the past two decades, various optical interference techniques, such as speckle interference, moiré interference, and shear speckle interferometry, have become important methods of 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 stressed object. Because it has the characteristics of full-field measurement, simple optical path, convenient adjustment, and low environmental requirements, it is widely used in various types of precision measurements. [0003] Traditional optical interferometers usually give measurement results in the form of interference fringe patterns. Due to ...

Claims

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Application Information

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IPC IPC(8): G01N21/88
CPCG01N21/88G01N21/8806
Inventor 张东升刘斌王福红
Owner SHANGHAI UNIV
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