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Method for measuring object deformation field by using moire interference carrier frequency modulation technology

A technology of moiré interference and deformation field, which is used in measurement devices, instruments, and optical devices to transmit sensing components, etc.

Inactive Publication Date: 2008-12-03
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high sensitivity of moiré interferometry and phase shifting technology, they have relatively strict requirements on the measurement environment

Method used

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  • Method for measuring object deformation field by using moire interference carrier frequency modulation technology
  • Method for measuring object deformation field by using moire interference carrier frequency modulation technology
  • Method for measuring object deformation field by using moire interference carrier frequency modulation technology

Examples

Experimental program
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Effect test

Embodiment

[0059] use as figure 1 The optical path shown is for the measurement of the displacement field of a simply supported beam, carried out on an anti-vibration table. The simply supported beam is made of aluminum, the length is 100mm, the height is 12mm, the thickness is 5mm, the span is 60mm, and the elastic modulus of the material is E=6.7×10 4 MPa. The sample grid 1 is irradiated parallelly with a 633nm He-Ne laser beam, the sample grid frequency is 1200 lines / mm, and the incident angle is 49.4°. When the specimen grid is well prepared and there are few initial fringes (one to two), the stepper motor can be controlled at this time to deflect the plane mirror and introduce the carrier. figure 2 Shown is the carrier fringes obtained by symmetrically illuminating the simply supported beam with two horizontal beams; image 3 Shown are the carrier fringes obtained by symmetrically illuminating a simply supported beam with two vertical beams. After loading, the two-carrier fring...

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Abstract

The invention supplies a method of measuring deformation field of body with moire intervention carrier modulation. The method is in moire intervention, based on the proportional relationship between angle variations of light and spatial frequency of carrier fringes, the carrier can be introduced by controlling the deflection of reflector to change the light angle of incidence grid; the space modulation of interference fringe can be realized; the phase field of deformation of body can be demodulated by Fourier method, so the deformation field of body can be obtained. The invention makes use of the proportional relationship between angle variations of light and carrier frequency and realizes the space modulation of interference fringe conveniently by deflecting reflector to change the light angle of incidence grid, it is easy to accomplish, and the requirement to measuring environment is low.

Description

technical field [0001] The invention relates to a method for measuring deformation field of an object by moiré interference carrier frequency modulation. Background technique [0002] In the measurement of the deformation field of an object, the carrier frequency modulation technique of moiré interference plays an important role. In moiré interference, the grating (specimen grating) is replicated on the surface of the object to be measured, the collimated symmetrical light illuminates the specimen grating, and the in-plane displacement of the object deformation can be measured by using the interference of the first-order diffracted light of the specimen grating. Moiré interferometry has the advantages of high sensitivity, good fringe quality, high fringe resolution, real-time observation, and not limited by materials. It has been popularized in mechanical experimental researches such as fracture mechanics, composite material mechanics, structural strength, and temperature st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16G01B11/00G01B9/02G01D5/26G01D5/38
Inventor 孙平
Owner SHANDONG NORMAL UNIV
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