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Polarization spectral imaging system based on four-phase modulation

An imaging system and polarization spectroscopy technology, applied in the field of spectral imaging, can solve problems such as reduced stability and reliability, inability to obtain polarization and spectral information at the same time, and increased instrument complexity, and achieve good detection and identification, low power consumption, and volume. small effect

Inactive Publication Date: 2021-08-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] However, there are few airborne and spaceborne spectral polarization instruments currently in use, and the acquisition of polarization is basically based on mechanical moving parts, which cannot simultaneously acquire polarization and spectral information, which increases the complexity, stability and reliability of the instrument also decreased

Method used

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  • Polarization spectral imaging system based on four-phase modulation
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  • Polarization spectral imaging system based on four-phase modulation

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Embodiment 1

[0041] The area array detector can be in the following forms. The area array detector is a plurality of detector groups composed of four small area array detectors, each corresponding to a polarizer in one direction. By collecting the images of four area array detectors, the polarization information, spectral information and spatial information in four directions can be obtained at the same time, which provides a basis for improving the target resolution, such as figure 2 shown.

Embodiment 2

[0043] The area array detector can also be in the following form. The area array detector is a whole, and the four direction polarizers arranged in a square correspond to the four pixels on the area array detector respectively, and each pixel is periodic in a square form. sex distribution, such as image 3 shown.

[0044] According to the image data set received by the detector, it contains spectral images under four polarization angles in each band at the same time, and four polarization angle images under the same wavelength, which provides more information for subsequent target detection.

[0045] Generally, the Stokes vector is used to represent the polarization state:

[0046]

[0047] In the formula, S 0 : total light intensity; S 1 : the difference between the light intensity component in the horizontal polarization direction and the light intensity component in the vertical polarization direction; S 2 : the difference between the light intensity component with a p...

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Abstract

The invention discloses a polarization spectral imaging system based on four-phase modulation. The polarization spectral imaging system is composed of a front telescopic system and a spectral polarization imaging system. After entering a slit through the front telescopic system, a light beam passes through a catadioptric lens, reaches an immersion grating for dispersion, then is reflected to the catadioptric lens, reaches a phase modulator, and reaches an area array detector after passing through the phase modulator. The phase modulator is formed by arranging four phase modulators in different directions in an array on the same plane, and the four phase modulators are respectively 0 degree, 45 degrees, 90 degrees and 135 degrees. The polarization spectral imaging system based on four-phase modulation can simultaneously acquire polarization, spectrum, space and other multivariate information of a measured target, does not have any mechanical moving part, effectively improves the target identification degree under a complex background, is compact in structure, and is suitable for space technology application.

Description

technical field [0001] The invention relates to the fields of spectral imaging and polarization remote sensing, in particular to a polarization spectral imaging system based on four-phase modulation. Background technique [0002] The traditional photoelectric imaging detection technology detects the target based on the difference in the intensity value of the reflected or radiated light waves between the target and the background. When the background is cluttered or the target is camouflaged, this technology is almost ineffective. The polarization characteristic of light is a physical quantity that can characterize the essential characteristics of an object. Man-made objects on the earth's surface and in the atmosphere always reflect or radiate certain electromagnetic waves on their surfaces. Compared with man-made objects, the surface of natural objects is relatively rough, and the degree of linear polarization of their radiated or reflected electromagnetic waves is almost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J3/447G01J3/02
CPCG01J3/2823G01J3/447G01J3/2803G01J3/0224
Inventor 陈阳闫钧华朱德燕张寅胡子佳时萌玮刘子健丁鹏远张少帅顾恩臣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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