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Sinusoidal fringe structural light projector based on acousto-optic deflection device

An acousto-optic deflector and projection device technology, applied in the direction of optical devices, measuring devices, optics, etc., can solve problems such as the influence of phase resolution accuracy, projector volume, heavy weight, unfavorable integration and online test flexibility, etc., to achieve High sine, fast adjustment speed, and the effect of improving the accuracy of three-dimensional measurement

Inactive Publication Date: 2009-06-03
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

Since the projected fringes are computer-simulated images, the required phase shift and fringe width can be accurately obtained through the program to meet the characteristics of fringe adaptive projection. However, since this kind of projector projects discrete digital structured light, it is not necessary to resolve the phase. The accuracy is affected, and the projector is large in size and weight, which is not conducive to the flexibility of integration and online testing

Method used

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  • Sinusoidal fringe structural light projector based on acousto-optic deflection device
  • Sinusoidal fringe structural light projector based on acousto-optic deflection device
  • Sinusoidal fringe structural light projector based on acousto-optic deflection device

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[0029] like figure 1 , figure 2 As shown, the present invention is divided into electrical part and optical path part, computer control system 1, double DDS signal generation and frequency mixing device 2, power amplifier 3, modulation laser 4, collimating mirror 5, acousto-optic deflector 6, projection lens respectively 7. Composed of aperture 8, in which the computer control system 1 is the control center of the entire projection device, outputting control signals to the double DDS signal generator 2 and the modulation laser 4, the control signal controls the frequency and phase of the DDS signal and the brightness of the modulation laser. Duty cycle, thereby controlling the phase frequency and brightness of the projected sinusoidal stripes; the dual DDS signal generation and mixing device 2 includes two high-speed DDS chips, a mixing multiplier and other control filter electronic components, and the dual DDS generates two frequencies phase-controllable high-frequency sign...

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Abstract

A sine stripe configuration light project equipment based on acousto-optic deflector relates to acousto-optic deflector, double DDS signal generator equipment, mixing multiplier, power amplifier, confection laser, light system and computer controlling system. The acousto-optic deflector produces intervened stripe. Double DDS signal generator equipment produces two-way driving signal. Mixing multiplier mixes the center frequency of the acousto-optic deflector and the confection signal of the DDS. Power amplifier amplifies the power of the mixing signal. Confection laser offers coherent light source and incepts driving signal of laser from DDS. Light system relates to collimating mirror, projection lens and diaphragm which filtrates the 0 level diffraction light from the acousto-optic deflector. Computer control system controls the frequency and phase of the double DDS signal generator equipment to bring the signal, adjusts and controls the brightness and duty ratio of the high frequency confection laser.

Description

technical field [0001] The invention relates to a sinusoidal stripe structured light projection device based on an acousto-optic deflector. Background technique [0002] Since the fast real-time 3D stereo vision detector can detect and locate the shape and distance of unknown areas and targets faster, more accurately and more automatically, so that the machine vision system has stronger functions, so in automatic target recognition, guidance In terms of positioning and positioning, it has attracted widespread attention at home and abroad, and has been widely used in product quality inspection, reverse engineering, and autonomous automatic space docking between spacecraft. [0003] Projected grating phase matching is a new type of stereo matching method. The stereo vision detection method based on projected grating phase matching uses projected stripes to structure the measured surface to obtain stereo matching points. This method can obtain higher accuracy than passive visio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25G01B11/02G02F1/33
Inventor 赵慧洁殷雪冰曾俊钰董超
Owner BEIHANG UNIV
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