A Light Wave Polarization Detection Method Based on Vector Light Field Modulation and Image Processing
An image processing and polarization state technology, which is applied in the field of light wave polarization state detection, to reduce the impact, improve detection accuracy, and avoid detection errors
Active Publication Date: 2022-03-11
NAT UNIV OF DEFENSE TECH
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The interference type is as published in Comparative Document 3 (Chinese Invention Patent, 201110226648.7) "Method and Optical Path System for Monitoring Optical Fiber Polarization Changes", using optical fiber couplers to form an interference optical path, and monitoring the changes in the polarization state of optical fibers by detecting the interference light intensity , but this scheme is only suitable for polarization detection of single-wavelength or narrow-linewidth light waves
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[0041] The present invention will be further described below in conjunction with accompanying drawing of description:
[0042] figure 1 It is a schematic diagram of the optical path of a light wave polarization state detection method based on vector light field modulation and image processing provided by the present invention. The light source to be measured 1, the quarter wave plate 2, and the zero-order vortex half are arranged side by side from left to right. wave plate 3, analyzer 4, camera 5 and computer 6. The light wave with unknown polarization state emitted by the light source 1 to be tested is incident on the zero-order vortex half-wave plate 3 after passing through the quarter-wave plate 2, and the zero-degree fast axis is set at 0 °The zero-order vortex half-wave plate 3 in the horizontal direction converts the incident light field into a vector polarized light field, and the vector polarized light field is analyzed by the analyzer 4 that transmits light in the ho...
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The invention belongs to the technical field of polarization detection and discloses a light wave polarization state detection method based on vector light field modulation and image processing. The light wave with unknown polarization state emitted by the light source to be tested is incident on the zero-order vortex half-wave plate after passing through the quarter-wave plate, and the zero-order vortex half-wave plate converts the incident light field into a vector polarized light field, and the vector polarized light After the field is processed by the analyzer, a light intensity image with bright and dark wedge-shaped distribution is formed. During detection, the angle of the quarter-wave plate is adjusted twice before and after, so that the bright areas of the light intensity image reach two specific directions respectively and the light intensity images are collected, and the light intensity images collected twice are analyzed and processed. The polarization state of the light wave to be measured can be calculated by combining the angles of the quarter-wave plate in the two measurements. The invention has the advantages of convenient operation and high detection precision, and the detection result is insensitive to the power and wavelength changes of the light source.
Description
technical field [0001] The invention relates to the technical field of polarization detection, and further relates to a method for realizing light wave polarization state detection by using vector polarization light field modulation and digital image processing technology. Background technique [0002] Polarization is one of the most basic characteristics of light waves. The detection of polarization state has important applications in many fields. For example, in remote sensing detection, the direction, shape, and surface roughness of the target can be known from the polarization state of the reflected light of the target. Degree and other information; In large-capacity, high-speed, long-distance optical fiber communication systems, it is necessary to make timely detection, suppression, and compensation of polarization effects in optical fibers (such as polarization mode dispersion, polarization-dependent modulation, and loss, etc.) to improve information In the field of bi...
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IPC IPC(8): G01J4/00
CPCG01J4/00
Inventor 雷兵高超刘建仓雷雨
Owner NAT UNIV OF DEFENSE TECH