A colorless RGB photoelasticity measurement method based on a color polarized camera

By combining a color polarization camera and a plane polarization optical path, the problems of difficulty in obtaining the phase of the istilever line and color difference interference in RGB photoelastic technology are solved, realizing high-precision stress distribution measurement and improving measurement efficiency and accuracy.

CN122108403APending Publication Date: 2026-05-29SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV
Filing Date
2026-01-22
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing RGB photoelastic technology cannot obtain isochoric phase and suffers from color difference interference, resulting in low measurement accuracy and the inability to perform full stress analysis.

Method used

A color-difference-free RGB photoelastic measurement method based on a color polarization camera is adopted. By using a plane polarization optical path and dual light sources, the photoelastic image is acquired through a color polarization camera. Combined with the RGB channel synthesis algorithm and the four-step phase shift method, the phase of the isotropic lines and isochoric lines is calculated to eliminate color difference interference and achieve high-precision measurement of complete stress distribution.

Benefits of technology

It achieves high-precision and rapid acquisition of stress distribution, simplifies the optical path structure, reduces the use of optical components, improves measurement efficiency and accuracy, and reduces operation steps and human error.

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Abstract

The present application relates to a kind of achromatic RGB photoelasticity measurement methods based on color polarized camera, which is based on plane polarized light path implementation, in plane polarized light path, first light source and second light source of vertical distribution are sequentially through polarizer, half mirror, the tested piece and the color polarized camera of polarization array assembly respectively, birefringence effect is generated by stress at the tested piece, and photoelastic image with polarization information is collected by color polarized camera;Photoelastic image is generated by RGB channel synthesis algorithm to generate an achromatic photoelastic dark-field image;Based on photoelastic dark-field image, in combination with the calibration curve of RGB color value-equal difference line fringe number, equal difference line phase is solved;Based on the collected photoelastic image, equal inclination line phase is calculated using four-step phase shift method.Compared with the existing instantaneous photoelasticity method of circular polarized light path, the present application improves the precision and efficiency of color photoelasticity measurement and other advantages.
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