Mirror surface object three-dimensional measurement method based on sine pulse width modulation stripes

A sinusoidal pulse width modulation, three-dimensional measurement technology, applied in measurement devices, instruments, optical devices, etc., to achieve the effects of simple calculation, improved measurement accuracy, and flexible control

Inactive Publication Date: 2020-05-15
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

Due to the reflective characteristics of mirror or mirror-like objects, the traditional three-dimensional surface shape detection cannot meet the requ

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  • Mirror surface object three-dimensional measurement method based on sine pulse width modulation stripes
  • Mirror surface object three-dimensional measurement method based on sine pulse width modulation stripes
  • Mirror surface object three-dimensional measurement method based on sine pulse width modulation stripes

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Embodiment Construction

[0019] The examples of the present invention are described in further detail below in conjunction with the accompanying drawings, but the examples are not intended to limit the present invention, and all similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

[0020] A three-dimensional measurement method for specular objects based on sinusoidal pulse width modulation fringes, the principle of which is as follows figure 1 As shown, it includes a collection device CCD camera, a projection device LCD 1 and LCD 2, a half mirror (BS), a reference mirror, a mirror to be tested, and a computer. First use the computer to generate the pre-designed sinusoidal pulse width modulation four-step phase shift stripes, and then use the projection equipment LCD1 and LCD2 to project the sinusoidal pulse width modulation four-step phase shift stripes onto the reference mirror and the mirror to be tested. , the fringe i...

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Abstract

The invention discloses a mirror surface object three-dimensional measurement method based on sine pulse width modulation stripes. The measurement method comprises the following steps: firstly, generating sine pulse width modulation four-step phase shift diagrams of three frequencies by utilizing a computer; respectively projecting the four-step phase shift diagrams of each frequency to the surface of a measured mirror surface object; using an optical system for defocusing, and converting sine pulse width modulation stripes into standard sine stripes; after the standard sine stripes are projected to the surface of the measured mirror surface object, collecting the standard sine stripes by an imaging system, and obtaining a wrapping phase through a four-step phase shift algorithm; and finally, performing phase unwrapping on the wrapped phase, obtaining the height of the measured mirror surface by directly establishing the relation between the absolute phase and the height, and recovering the three-dimensional morphology. According to the invention, the non-linear problems of projection and the camera are eliminated, the measurement precision is improved, the calculation is simple, the control is flexible, the operation is simple and convenient, the robustness on the measurement of a mirror surface object is high, and the method has potential application prospect and practical value in precision measurement.

Description

technical field [0001] The invention relates to an optical three-dimensional measurement method, which belongs to the technical field of photoelectric detection, and in particular to a three-dimensional measurement method of a specular object based on sinusoidal pulse width modulation stripes. Background technique [0002] With the advancement of science and technology and the rise of the precision manufacturing industry, the traditional one-dimensional and two-dimensional measurement technology has been unable to keep up with the modern industrial process. How to quickly and accurately obtain the three-dimensional shape of products with high precision requirements has gradually become a hot spot of concern. Optical 3D measurement technology has been widely used in reverse engineering, industrial inspection, virtual reality, medical engineering, cultural relics protection and other fields due to its characteristics of fast acquisition, non-contact operation, full-field measu...

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 伏燕军倪武王朝旭韩勇华钟可君
Owner NANCHANG HANGKONG UNIVERSITY
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