Speckle generating device and method with adjustable contrast value

A technology for generating devices and contrast, applied in measuring devices, optical devices, instruments, etc., can solve the problems of lack of speckle generating devices and methods, and achieve the effect of simple devices and simple principles

Inactive Publication Date: 2015-05-20
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The analysis shows that in the speckle illumination microscopy technique, there is still a lack of a speckle generation device and method with an adjustable contrast value

Method used

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  • Speckle generating device and method with adjustable contrast value
  • Speckle generating device and method with adjustable contrast value
  • Speckle generating device and method with adjustable contrast value

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Embodiment Construction

[0026] Below in conjunction with example the present invention will be further described.

[0027] Such as figure 1 As shown, a speckle generating device with adjustable contrast value includes a continuous wave laser 100. The continuous wave laser 100 adopts a He-Ne laser with a wavelength of 632.8nm and a power of 1mW. The beam of the continuous wave laser 100 advances The direction is provided with a beam scaler 110, a polarizer 121, a diaphragm 130, a spatial light modulator 200, an analyzer 122, a Fourier lens 140, and a CCD camera 300 in sequence;

[0028] The spatial light modulator 200 and the CCD camera 300 are respectively connected with the computer 400; the image on the spatial light modulator 200 is written by the computer 400; The beam waist size of the laser beam on the modulator 200; the spatial light modulator 200 is located on the front focal plane of the Fourier lens 140, and the CCD camera 300 is located on the back focal plane of the Fourier lens 140;

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Abstract

The invention discloses a speckle generating device and a speckle generating method with an adjustable contrast value. The speckle generating device comprises a continuous wave laser, wherein a light beam zoom unit, a polarizer, a diaphragm, a spatial light modulator, an analyzer, a Fourier lens and a CCD (Charge Coupled Device) camera are sequentially arranged in the forward direction of a light beam of the continuous wave laser; speckle field information generated by the spatial light modulator is imaged by the CCD camera and then is stored in a computer; the spatial light modulator and the CCD camera are connected with the computer respectively; an image on the spatial light modulator is written by the computer; the light beam zoom unit is used for controlling the beam waist size of a laser beam emitted to the spatial light modulator; the spatial light modulator is positioned on a front focal plane of the Fourier lens; the CCD camera is positioned on a rear focal plane of the Fourier lens. Moreover, the speckle generating device has the advantages of simple principle, simple device, online adjustment and the like and can be widely applied to the fields of laser speckle illumination microscopy technologies, speckle contrast value testing technologies and the like.

Description

technical field [0001] The invention relates to a laser speckle generating device and method, in particular to a speckle generating device and method with adjustable contrast value, belonging to the field of optical testing and microscopic application. Background technique [0002] Laser speckle refers to the bright and dark spots formed after the diffuse reflection light interferes with each other in the reflection space when the laser is irradiated on the surface of a rough object. Speckle carries the information of the measured object, and the change information of the measured object can be obtained by analyzing the speckle field. [0003] In speckle illumination microscopy, the contrast of the illuminated speckle light field is an important parameter; the axial variation of the speckle field contrast can be used to obtain better optical sectioning, and the projection can be reduced by reducing the speckle field contrast. The number of speckles can obtain a smooth image...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/30
Inventor 李新忠台玉萍王晓飞王辉李海生张利平甄志强李贺贺
Owner HENAN UNIV OF SCI & TECH
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