Bi-mode full polarization imaging polarization measurement method

Abstract

The present invention relates to the field of polarization imaging, and more particularly to a bi-mode full polarization imaging measurement method, comprising the use of a snapshot mode or a time division mode to conduct full polarization imaging measurement to a target. The method is technically performed as follows: an incident light passes sequentially in its transmission direction the coaxially arranged elements of a filter, a first modified Sava-type polarizer, a half-wave plate, a second modified Sava-type polarizer and a polarizer, and is then converted into four parallel beams of linearly polarized light, followed by a process of imaging for a first interference pattern of the incident light which forms S0 ~ 3 images of the incident light after demodulation. Through the 90-degree horizontal rotation of the polarizer along the plane where the polarizer is located and another process of imaging, a second interference pattern of the incident light can be available. The adding of the first interference pattern and the second interference pattern forms a full resolution S0 image that eliminates crosstalk targets. The images S1-S3 are obtained through the demodulation of the differential image of the first interference pattern and the second interference pattern. The polarization direction angle of the polarizer is 22.5 degrees. The present invention provides a bi-mode polarization measurement method for selecting different modes of full polarization imaging for different requirements of different targets.

Description

technical field [0001] The invention relates to the field of polarization imaging, in particular to a dual-mode full polarization imaging deviation measurement method. Background technique [0002] The schematic diagram of the optical path of the snapshot imaging polarization measurement method (SIP) using the traditional Savoyard polarizer combination (CSPs) as the core spectroscopic device is as follows: Figure 1-3 as shown, figure 1 A snapshot imaging polarimeter with a combination of traditional Savoyard polarizers as a transverse shearing beam splitter, including Input light 1 emitted by the light source, Filter 2, the first traditional Savoyard polarizer CSP1 3, half Wave plate HWP 4, polarization direction angle is 22.5°, second traditional Savoyard polarizer CSP2 5, analyzer Analyzer 6, polarization direction angle is 45°, lens Lens 7, charge coupled device CCD 8, lens and charge coupling The spacing f9 between elements, θ is the incident angle, figure 2 It is a...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that S 2 and S 3 The modulation factor is only S 1 half of , resulting in the inversion of S at the same noise level 2 and S 3 The signal-to-noise ratio is significantly lower than that of S 1 , which will result in the S 2 or S 3 The polarization parameters calculated by the components (such as polarization angle θ=[arctan(S 2 / S 1 )] / 2, polarization azimuth angle etc.) The signal-to-noise ratio is not high, which is not conducive to the subsequent use of polarization information; the polarization parameter S 0 channel has crosstalk to other channels, and S 0 low spatial resolution

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