Production method and device of projection structural light

A generation method and structured light technology, applied in optics, optical components, instruments, etc., can solve problems such as difficulty in generating sinusoidal structured light, phase shift speed and reliability limitations, poor stability, etc., to achieve good controllability and universal application High performance, strong anti-interference ability and good stability

Inactive Publication Date: 2003-04-30
TIANJIN UNIV
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Problems solved by technology

The main difficulties in the practical application of the above methods are: the methods and devices based on laser interference projection (such as Mach-Zehnder structure) are poor in stability, extremely sensitive to mechanical vibration and other various disturbances, and difficult to generate real-time spatial Frequency-converted projected structured light and phase shift make it difficult to apply to on-site and dynamic environments; although the projection based on white light gratings has a stable structure, it is generally difficult to generate sinusoidal structured light with Ronchi gratings, and it is also difficult to change the structure of structured light dynamically and in real time. spatial frequency
Due to the presence of mechanical motion in the above two types of methods and devices, the speed and reliability of phase shifting are greatly limited.

Method used

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  • Production method and device of projection structural light
  • Production method and device of projection structural light
  • Production method and device of projection structural light

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Embodiment Construction

[0011] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0012] as attached figure 1 As shown, the continuous laser beam generated by the laser 101 is divided into two parallel beams with equal or nearly equal intensity after passing through the beam splitter 102 . They respectively enter the acousto-optic modulators 103 and 104 to generate first-order diffracted light. They will leave the AOM at a small angle proportional to the frequency of the AOM drive signal. An optical wedge as a beam direction fine tuner is used to adjust the angle between two beams. Two beams of parallel light are obtained after passing through optical wedges 105 and 106 , and two beams of light are obtained after passing through a dual spatial filter 107 and entering a beam combiner 108 . The beam combiner 108 has the same structure as the beam splitter 102, but used in reverse. After they are focused by the positive lens 109, t...

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Abstract

In the invention, the beam of the coherent source through the procedures of beam splitting, diffraction, fine tuning the direction, spatial filtering, the light beam spacing transformation as well asfocusing and magnifying is projected on the scene to obtain the structure light of the static stripes with intensity in sine distribution. The two parallel beams after being split enter the two inputends of double acousto-optical modulators with the Bragg angle. The double acousto-optic modulators of the radio frequency signal in same frequency with 0-2 pi tunable phase difference are utilized to change the frequency of the signal in real time. The device includes the coherent source, the filter, the focusing lens and microscope objective.

Description

technical field [0001] The present invention relates to a method and device for generating projected structured light, more specifically to a technology for real-time generating projected structured light with spatial frequency conversion and phase shifting. Background technique [0002] The 3D sensing technology based on fringe structured light projection and phase measurement has the characteristics of full-field, non-contact, and fast information acquisition. This method does not require any mechanical or optical scanning mechanism and has high measurement accuracy, so it has been extensively researched and developed. The method and device for generating fringe structured light and known spatial phase shift are the key links of fringe structured light projection and phase measurement technology. At present, the main two types of methods for generating fringe structured light projection are laser interference projection and white light grati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/10G02B27/18G02B27/28
Inventor 李恩邦彭翔
Owner TIANJIN UNIV
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