Spectrum polarization device based on polarization array and detection method

Abstract

The invention discloses a spectrum polarization device based on a polarization array and a detection method. A principle optical axis along incident rays is sequentially provided with a front telescoping system, a delayer array, the polarization array, an achromatism half-wave plate array, a Wollaston prism, an analyzer, an imaging lens set and a data receiving system CCD detector from left to right. According to the spectrum polarization device based on the polarization array and the detection method, modulation of four different states of light is conducted through the polarization array, four S0 spectrums after modulation are obtained through the achromatism half-wave plate array and an interferometer based on the Wollaston prism, and therefore four Strokes vectors of incident light are restored. According to the spectrum polarization device based on the polarization array and the detection method, the spectrums and the four Strokes vectors of the incident light can be accurately obtained, spatial modulation is conducted on the spectrums and the polarization information through the polarization array at the same time, all channels are located in different spatial positions, the problem of channel aliasing does not exist, and the precision of the restored spectrums is higher. Meanwhile, due to the fact that all the channels respectively occupy the maximum optical path difference, the original spectrum resolution of an instrument is maintained, and the resolution of the restored spectrums is improved by seven times compared with an intensity modulation method.

Description

technical field [0001] The invention relates to a device and method for acquiring target spectrum and polarization state, in particular to a spectrum polarization device and detection method based on a polarization array. Background technique [0002] The Stokes vector spectrum can completely describe the spectrum and polarization information of the target, and the spectrum and polarization information are of great significance to the remote sensing of the earth. Spectral polarization technology is a new type of optical detection method. At present, only a few scientific research institutions in the world have carried out related research work. In particular, the Interference Spectropolarimeter (ISP) is still in the stage of principle exploration and experimental verification, and its technical means are not yet mature. [0003] At present, the conventional methods of measuring the state of polarization (Stokes vector spectrum) in the world include time-sequence measurement...

AI Technical Summary

Problems solved by technology

However, this method realizes the detection of Stokes vector through channel multiplexing technology and frequency domain filtering, and the data processing process is relatively complicated.

At the same time, frequency domain filtering reduces the maximum optical path difference to 1 / 7 of the original. According to the principle of Fourier transform spectroscopy, the resolution of the restored spectrum will be reduced to 1 / 7 of the original, which seriously affects the resolution of the restored spectrum.

During channel modulation, due to the spectral aliasing between channels, it is impossible to completely remove it by filtering, resulting in an irreversible error in the restored Stokes vector spectrum

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