System and method for projecting diffraction-grating-free type structured striations
A technology of structured light fringes and projection systems, applied in the direction of optical devices, instruments, measuring devices, etc., can solve the problems of low contrast and low phase resolution, and achieve the effect of high contrast, high resolution and convenient adjustment
Inactive Publication Date: 2012-09-26
HUAZHONG UNIV OF SCI & TECH
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[0005] Aiming at the problems of low phase resolution and low contrast of projected fringes in the prior art, the present invention provides a non-diffraction grating structured light projection system and its method, which uses interference fringes with sinusoidal distribution characteristics of light intensity to project, and obtains High-resolution, high-contrast non-diffraction grating structured light stripes are beneficial to improve the measurement accuracy and anti-noise ability of the measurement system
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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] In the non-diffraction grating structured light fringe projection system in the preferred embodiment of the present invention, such as figure 1 As shown, it mainly includes a laser 100 and a filter collimator 200. The laser 100 is used to provide parallel light, and the filter collimator 200 is used to spatially filter and collimate the parallel light to obtain better parallel light. The system also includes a first beam-splitting prism 300, a triangular prism 400, a total reflection prism group 500, and a second beam-splitting prism 600, wherein the first beam-splitting prism 300 is used fo...
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The invention discloses a system and method for projecting diffraction-grating-free type structured striations. The system for projecting the diffraction-grating-free type structured striations comprises a laser, a filter collimator, a first dispersion prism, a triangular prism, a total-reflection prism group and a second dispersion prism, wherein the first dispersion prism is used for splitting light subjected to spatial filtering and collimating by the filter collimator into two coherent light beams, namely a first light beam and a second light beam; the triangular prism is used for refracting the first light beam to generate tiny deflection to obtain a first light beam a; the total-reflection prism group is used for changing the light path of the second light beam to obtain a second light beam b; and the second dispersion prism is used for reflecting or refracting the first light beam a and the second light beam b respectively to generate interference so as to form spatial diffraction-grating-free type structured striations. By means of the system and method disclosed by the invention, the diffraction-grating-free type structured striations with high resolution ratio and high contrast ratio can be obtained, and the interference area of the striations can be changed by regulating the triangular prism conveniently.
Description
technical field [0001] The invention relates to the field of fringe projection, in particular to a non-diffraction grating structured light fringe projection system and a method thereof. Background technique [0002] The phase measurement technology based on fringe projection can realize fast full-field measurement of the three-dimensional shape of the object. This measurement technology has good application prospects in many fields, such as machine vision, biomedicine, quality control and inverse engineering. The characteristics of the projected fringes in the fringe projection-based phase measurement system directly affect the resolution and measurement accuracy of the three-dimensional shape measurement system, and determine the cost, volume and power consumption of the measurement system. [0003] Existing methods for 3D shape measurement fringe projection include: using a projection system based on an LCD or DMD digital projector, or using a projection system based on a...
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IPC IPC(8): G01B11/25
Inventor 周莉萍干江红徐龙
Owner HUAZHONG UNIV OF SCI & TECH