Unlock instant, AI-driven research and patent intelligence for your innovation.

Large-shearing carrier-frequency electronic speckle interference displacement field separating method

A technology of electronic speckle interference and separation method, which is applied in the field of separation of carrier frequency electronic speckle interference displacement field, can solve the problems of limited development, high noise of speckle fringes, etc., and achieve stable measurement, high fringe contrast, and simple system Effect

Inactive Publication Date: 2007-05-30
SHANDONG NORMAL UNIV
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has also been introduced into electronic speckle interference, but the high noise of speckle fringes limits the development of this technology

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Large-shearing carrier-frequency electronic speckle interference displacement field separating method
  • Large-shearing carrier-frequency electronic speckle interference displacement field separating method
  • Large-shearing carrier-frequency electronic speckle interference displacement field separating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] The carrier frequency modulation optical path of large-shear electronic speckle interference is shown in Figure 1. The laser beam is split into two beams: it passes through the variable beam splitter 1, the reflector 9 and the beam expander 7, and becomes the illumination light 11; after the variable beam splitter 1, the reflector 2, the reflector 10 and the beam expander 8, it becomes Illumination light 12. By adjusting the variable beam splitter 1, the light intensity of the illumination light 11 and the illumination light 12 can be made. A reference object 14 is fixedly placed next to the measured object 13, and both the illuminating light 11 and the illuminating light 12 can simultaneously illuminate the two objects. When the illuminating light 11 or the illuminating light 12 illuminates an object, the diffusely reflected light of the object passes through the large shearing prism 6 and the polarizing plate 5, and then enters the camera 3 through the lens 4.

[0019] Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A separating method for large shear carrier speckle interference displacement field is provided. The separating method is: in the system of shear electron speckle interference, mounts a reference beside the object to be measured, use symmetrical double light beam to illuminate the measuring object and the reference; the speckle interference is realized via large shear optical prism, the deflection of inference is introduced to the carrier modulation stripe; according to the value of deformation, deflects the angular of reference to adjust the spatial frequency to realize the modulation of displacement field; bending deformation of the carrier strip of measuring object is occurred by the deformation of the object; using the method of Fourier transformation, two phase diagrams containing the information of the separation surface and the inner surface displacement is obtained by demodulation; after enveloping the two-phase graphic analysis, the inner surface displacement field and the separation surface field are separated by algebraic computation. The advantages of invention are high quantity of modulation stripe, simple structure and don't need reference light. It can measure dichotomic component of the deformation field of body fast and stably.

Description

Technical field [0001] The invention relates to a separation method of carrier frequency electronic speckle interference displacement field. Background technique [0002] Shearing electronic speckle interferometry technology has the advantages of simple optical path, high degree of automation, low requirements for shock resistance, and direct measurement of the derivative field of displacement. It is widely used in the field of non-destructive testing. Using the shearing electronic speckle interferometry technology of the large misalignment crystal prism (Wollaston prism) can realize the displacement measurement of the speckle interference. It has the advantages of simple system, no need to introduce special reference light, and good fringe quality. In order to analyze the interference fringes of the deformation field with high precision, the phase shift method and the carrier method are commonly used to realize the phase measurement of the deformation field. Compared with the ph...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B11/16G01B9/02
Inventor 孙平
Owner SHANDONG NORMAL UNIV