Static snapshot type focal plane spectrum full-polarization information detection device and method

Abstract

The invention discloses a static snapshot type focal plane spectrum full-polarization information detection device and method. According to the device, an area array detector is installed on a focal plane detector, and a double-refraction phase retarder array and a birefringence interference element are arranged in front of the focal plane detector, so that the light to be measured is divided intofour sub-beams, and compared with a conventional spectrum full-polarization detection device, mechanical movement and an electric control modulation component are avoided, and the full-polarization information of a target spectrum can be obtained within a wide waveband range when the single exposure of the detector is guaranteed; and the double-refraction elements are all installed on the focal plane, so that the structure is simple and compact, integration is easy, and the size is small, and the device is light in weight, is not sensitive to vibration and environment, and has high aerospaceand field environment adaptability.

Description

【Technical field】 [0001] The invention belongs to the technical field of optical instruments, and relates to a static snapshot type focal plane spectrum full polarization information detection device and method. 【Background technique】 [0002] Spectral polarization measurement technology can obtain the spectrum and wavelength-related polarization information of the target light, and has a very wide range of applications in the fields of material science, environmental monitoring, biomedicine, astronomical observation, deep space exploration, and aerospace remote sensing. [0003] At present, commercial spectroscopic full-polarization measuring instruments (spectroscopy ellipsometry) mostly use liquid crystal adjustable phase retarders and subsequent spectral light-splitting structures to obtain full polarization information of different wavelengths, without mechanical moving parts, and have high stability. However, when it works, it needs to electronically control the rotati...

AI Technical Summary

Problems solved by technology

However, the above-mentioned full-spectrum polarization measurement instruments generally have problems such as complex optical paths, large volumes, and uncompact structures.

Although the channel modulation spectral polarization measurement technology can achieve a relatively compact structure and a small volume, there are channel aliasing and a large loss of spectral resolution

In recent years, Zhang Chunmin, Gao Peng and others respectively proposed a spectral full-polarization detection scheme based on a polarization array and a four-part phase retarder array, which can improve the spectral resolution of the channel modulation scheme, but their devices all use secondary imaging systems, which still exist. Disadvantages of large volume and complex structure

At the same time, the phase retardation of the wave plate or phase retarder in the polarization array and phase retarder array is related to temperature, and the measurement accuracy of the device is easily affected by the ambient temperature

In addition, the working wavelength range of the achromatic wave plate used in the polarizing array is also greatly limited

[0005] In general, on the one hand, since the full polarization information is high-dimensional information, and the maximum spatial dimension of the detector is only two-dimensional (area detector), the current common method is to use multiple detectors or a more complex optical path to combine the detectors Divide into several areas to obtain data, the inconsistent response of multiple detectors will reduce the accuracy of polarization measurement, and the complex optical path is easily affected by ambient temperature and vibration; It has a high degree of complexity and a large volume and weight

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