A digital holographic three-dimensional shape detection device based on multi-wavelength and multi-polarization state

A technology of three-dimensional topography and digital holography, which is applied to measurement devices, optical devices, instruments, etc., can solve the problems of inability to obtain phase distribution, limited application range, and distortion of reproduced images, and achieves compact structure, reduced operation difficulty, and improved performance. The effect of stability

CN105066908BInactive Publication Date: 2017-06-09BEIHANG UNIV
7 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-06-09
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a digital holographic three-dimensional shape detection device based on multiple wavelengths and multiple polarization states, which includes a laser light source, a light splitting and polarization state changing unit, a first beam collimation unit, a measured object, and a second beam collimation unit , optical path compensation and beam deflection unit and CMOS camera; this device adopts digital holography method, combined with multi-wavelength measurement technology, which can be used for three-dimensional topography of objects with non-optical smooth surface, high roughness, discontinuous surface structure and large fluctuations Detection; combined with the influence of light wave polarization state on speckle distribution, the information fusion of multiple holograms under different polarization states can effectively suppress the influence of speckle on the reconstructed image and improve the signal-to-noise ratio.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a three-dimensional shape detection system, more particularly, to a digital holographic three-dimensional shape detection system based on multi-wavelength and multi-polarization states. Background technique

[0002] Digital holography technology uses CCD, CMOS and other photoelectric imaging detection devices as recording media, and records holograms in digital form, uses computer to digitally reproduce the optical diffraction process, reconstructs the three-dimensional light field, and obtains the amplitude and phase information of the light field at the same time . Its advantages include: (1) It is detected in a non-contact manner, which has little influence on the measured object; (2) The recording and reproduction process is completed in digital form, and the three-dimensional information of the object can be quantitatively analyzed; During the construction process, digital image processing technology can be conven...

Examples

Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] Such as figure 1 As shown, the present invention is a digital holographic three-dimensional shape detection device based on multiple wavelengths and multiple polarization states. Object 4 , second beam collimation unit 5 , optical path compensation and beam deflection unit 6 and CMOS camera 7 . Wherein, the first beam collimating unit 3 and the second beam collimating unit 5 have the same structure.

[0032] The laser light source 1 generates laser light 1a, and the laser light 1a is input to the light splitting and polarization changing unit 2;

[0033] Laser light source 1 is used to provide 635nm-682nm laser 1a, that is, optical information. This light source provides a single longitudinal mode laser with a central wavelength range of 635nm-682nm. The laser model Xperay-TL-STD produced by South Korea NANOBASE company can be selected. . According...