Method for determining wedge angle of variable-gap Fabry-Perot interferometer

A technology of Perot interferometer and determination method, which is applied in the field of determination of wedge angle of variable gap Fabry-Perot interferometer, can solve the problem of low accuracy of determination of wedge angle of interferometer, and achieve the effect of improving accuracy

Active Publication Date: 2020-08-07
西安应用光学研究所
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for determining the wedge angle of a variable-gap F...

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  • Method for determining wedge angle of variable-gap Fabry-Perot interferometer
  • Method for determining wedge angle of variable-gap Fabry-Perot interferometer
  • Method for determining wedge angle of variable-gap Fabry-Perot interferometer

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[0085] Assuming that the system's spectral resolution requirement is 15cm -1 , The working band of the system is 8-12μm, the pixel size of the detector is 25μm, and the lateral size of the interferometer is 10.2mm. To meet the system's spectral resolution requirements, according to formula (3), we can get:

[0086] α≥16.33mrad

[0087] In order to satisfy the sampling law, according to formula (5), given the limited range of the wedge angle of the interferometric cavity of the variable gap Fabry-Perot (F-P) interferometer, we can get:

[0088] 13.33mrad≤α≤26.64mrad

[0089] which is

[0090] 0.936°≤α≤1.53°

[0091] Just like figure 1 As shown, based on the established mathematical model of variable gap Fabry-Perot (FP) interferometer interference cavity wedge angle and variable gap Fabry-Perot (FP) interference spectral imaging system interference fringe modulation, the interference can be obtained The variation curve of fringe modulation degree with wedge angle. The curve shows that ...

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Abstract

The invention belongs to the field of spectral imaging and discloses a method for determining the wedge angle of a variable-gap Fabry-Perot interferometer. On the basis of the relation between four system indexes or performance parameters of the spectral resolution, sampling law, Airy spot center distance and interference fringe modulation degree of an interference spectral imaging system and thewedge angle of the variable-gap Fabry-Perot interferometer, constraint conditions of the wedge angle of the interferometer are established; and the optimal value interval of the wedge angle is determined. In addition, the relation curve of the Airy spot center distance and a front-end imaging objective lens under different wedge angles is analyzed, and the value of the wedge angle is further optimized. The variable-gap Fabry-Perot interferometer is used as a core part of a spectral imaging module; the size of the wedge angle determines multiple important indexes such as spectral resolution, fringe modulation degree and signal-to-noise ratio of the whole module, and the optimal value of the wedge angle can be determined by using the method of the technical schemes of the invention, so thatthe performance of the whole variable-gap Fabry-Perot interference spectral imaging system is optimal.

Description

Technical field [0001] The invention belongs to the technical field of spectral imaging and relates to a method for determining the wedge angle of a variable gap Fabry-Perot interferometer. Background technique [0002] Interference spectral imaging technology is valued by various military powers. Developed countries such as the United States have applied spectral imaging technology to reconnaissance, early warning and protection systems. The mastery and application of this technology will surely have a major role in mastering battlefield information in future high-tech wars. significance. Various targets and backgrounds have special spectral characteristics. When the spectral signals of the target and the background are significantly different, the spectral imaging system uses its final data cube to highlight the target to be detected in the various spectra, which can be complex to the ground Detect and identify targets in the background, camouflage / stealth targets, jungle semi...

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Application Information

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IPC IPC(8): G01M11/02
CPCG01M11/0271
Inventor 张芳米建军张安锋张兰兰李旭东张茗璇刘张飞
Owner 西安应用光学研究所
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