Self-correcting method for optical grating based on linear phase position

A self-correcting, straight line technology, applied in the direction of optical devices, measuring devices, instruments, etc., can solve the problems of increasing the difficulty of finding fringes, inaccurate measurement accuracy of grating waveform phase shift, and low density of measuring points

Inactive Publication Date: 2007-11-07
HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG +1
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Problems solved by technology

The triangulation method has a clear principle and good real-time performance, but the density of the measurement points is not high. If thinner fringes are used for projection, it will be more difficult to find fringes, so we use the phase method for processing
The basic requirement of grating projection three-dimensional measurement is that the projected gr

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  • Self-correcting method for optical grating based on linear phase position
  • Self-correcting method for optical grating based on linear phase position
  • Self-correcting method for optical grating based on linear phase position

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Embodiment Construction

[0055] The specific implementation manners of the present invention will be further described below in conjunction with the drawings. According to the above method, the grating self-calibration operation is realized by using C++ programming on the VC++6.0 platform in the Windows operating system.

[0056] Firstly, each factor is analyzed from the perspectives of grating sine, precise phase shift, and periodicity, and targeted improvement methods and measures to improve accuracy are put forward to provide a basis for the final grating self-correction method; and in grating projection In the measurement, the main problem affecting the measurement accuracy is the projection technology. The projection in the grating projection measurement requires high contrast, intensity and good light intensity mode. Therefore, we can evaluate the accuracy of phase-shift grating projection measurement from the perspective of the sine and periodicity of the projected grating waveform, and convert...

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Abstract

The invention discloses a grating self-tuning method based on the straight line phase in the three dimensional sweeping system, which relates to the reversion project, obtains four phase-shifts charts with the phase-shift method, then, carries on the straight line phase transition to the obtained four phase-shifts chart, carries on the two rides straight line fitting to the straight line phase obtain the fitting straight line phase, adjust the phase spot of deviate fitting straight line phase on the fitting straight line phase and obtain the adjustment phase spot, and then based the adjust phase spot, carry on the inverse transformation with the phase-shift method to obtain the new four phase-shifts chart, compared with the original four phase-shifts chart, obtain the transfer function between the projection diffraction grating and the gathering grating, and take the transfer function as the adjustment optimization function, adjust the computer production diffraction grating, realized the self-tuning of the grating. The method effectively improved the projection grating profile sine and the precise phase-shift, can enhance the grating profile robustness, also can increase the phase-shift precision, and then enhance the system measuring accuracy.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional information reconstruction, and mainly relates to a method for self-correction of projection grating through linear phase correction by combining Gray code and phase shift method in a three-dimensional scanning system in reverse engineering, in particular to a method based on linear phase Grating self-calibration method. Background technique [0002] When the grating is projected onto the surface of the object, the phase of the periodic grating is modulated by the height profile of the object surface, forming a deformed grating, which carries the three-dimensional information of the object. Accurately obtaining the phase information modulated by the height of the object and performing phase unwrapping is the core of the fringe image automatic analysis technology, which plays a key role in obtaining the three-dimensional information of the object. The sinusoidality and precise phase shif...

Claims

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Application Information

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IPC IPC(8): G01B9/08G01B11/24
Inventor 达飞鹏朱正键
Owner HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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