Full linear polarization spectral imaging device based on combination of aotf and optically active crystal

Abstract

The invention discloses a full linear polarization spectrum imaging device based on the combination of AOTF and optical active crystal. The device is composed of a telescopic system, a full linear polarization spectrum imaging component, a computer control and an image acquisition system. The full linear polarization spectrum imaging component consists of an unbiased beam splitter, a compensator, an optical crystal, an AOTF, an AOTF drive controller, an imaging mirror, and a detector. In the present invention, the full linear polarization spectrum imaging device based on the combination of AOTF and optical active crystal adopts the combination of AOTF and optical active crystal in the imaging optical path, and the 0° of the same target can be obtained synchronously and in real time through the AOTF and optical active crystal in the full linear polarization spectrum imaging component. , 90°, 45° and 135° four polarization angles of continuous transformation full linear polarization spectrum image, with high optical efficiency, high spectral resolution, and good real-time performance.

Description

technical field [0001] The invention belongs to the technical field of polarization spectrum imaging, and relates to a polarization spectrum imaging device, in particular to a full linear polarization spectrum imaging device based on the combination of AOTF and optical rotation crystal. Background technique [0002] Polarization imaging technology can obtain the two-dimensional image information of the target and the polarization information of each point of the image, while the spectral imaging technology is an organic combination of the spectral analysis technology that extracts and analyzes the characteristics of the target spectral data and the two-dimensional imaging technology that images the target Therefore, the combination of polarization imaging technology and spectral imaging technology produces polarization spectral imaging technology, which is a new technology that simultaneously obtains space, spectrum, and polarization information. It has been widely used in m...

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Problems solved by technology

However, the camera has two shortcomings: first, there are moving parts of the filter switching device, and the switching control is complicated, so it is difficult to ensure real-time and accuracy; second, the number of beam splitters is large, which greatly reduces the camera system. optical energy

In this method, a beam splitter is used to split the incident light into two paths, and the two beams pass through two AOTFs respectively. They are perpendicular to each other, so the positive and negative stages of the two AOTFs can obtain light intensities of 0°, 45°, 90°, and 135° respectively, so as to obtain the spectral polarization information at the same time. However, this method uses one AOTF in imaging The polarization information of 90° and 135° is obtained by rotating the optical path by 45°, which is difficult to achieve in actual adjustment and accuracy, and it is difficult to design and adjust the follow-up optical path after AOTF is rotated by 45°, which is not conducive to actual Engineering Applications

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