Spectrum on-line calibration method of spatial modulation type long-wavelength infrared imaging spectrograph

An imaging spectrometer and long-wave infrared technology, which is applied in the direction of spectrometry/spectrophotometry/monochromator, instrument, scientific instrument, etc., can solve the problem of low spectral calibration accuracy, solve the problem of spectral drift, and improve the spectrum The effect of accuracy

Active Publication Date: 2017-05-31
KUNMING INST OF PHYSICS
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Problems solved by technology

[0004] The traditional spectral calibration method relies on a large amount of experimental data collected by the long-wave infrared imaging spectrometer for analysis. Due to the lack of collection process of the above-mentioned long-wave infrared imaging spectrometer, and the low accuracy of spectral calibration

Method used

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  • Spectrum on-line calibration method of spatial modulation type long-wavelength infrared imaging spectrograph
  • Spectrum on-line calibration method of spatial modulation type long-wavelength infrared imaging spectrograph
  • Spectrum on-line calibration method of spatial modulation type long-wavelength infrared imaging spectrograph

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Embodiment Construction

[0020] Usually, the ground object spectral information is obtained by the interference information through the spatially modulated long-wave infrared imaging spectrometer, and the interference information and the spectral information satisfy the Fourier transform relationship. The long-wave infrared imaging spectrometer has nanoscale spectral resolution and generally has tens to hundreds of bands. It can obtain spectral cube information composed of spatial information and spectral information of ground objects, and can identify ground objects in a detailed and effective manner. It has great Application value and broad application prospects.

[0021] The accuracy of spectral calibration of spatially modulated long-wave infrared imaging spectrometer directly determines the accuracy and availability of hyperspectral data, which is of great significance to spatially modulated long-wave infrared imaging spectrometer.

[0022] The spectral calibration method of the present invention...

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Abstract

The invention relates to a spectrum on-line calibration method of a spatial modulation type long-wavelength infrared imaging spectrograph, in particular to a spectrum on-line calibration method of an airborne spatial modulation type long-wavelength infrared imaging spectrograph. The method comprises the following steps: (1) reading a long-wavelength infrared imaging spectrograph interference data graph; (2) acquiring interference data of polypropylene and performing spectrum reconstruction to acquire spectroscopic data; (3) adopting characteristic peak position wavelength yi of a polypropylene standard spectrum and actually measured polypropylene characteristic peak point number xi; (4) performing calculation on polypropylene characteristic spectral line wave number y and the point number x corresponding to the actually measured characteristic peak by a least square method to obtain a0 and a1; (5) determining spectrum calibration coefficient between any two adjacent wave bands according to the step (4); and (6) determining the central wavelength of each wave band according to the spectrum calibration coefficient to finally finish spectrum calibration.

Description

technical field [0001] The invention relates to a spectral calibration method of a spatially modulated long-wave infrared imaging spectrometer, in particular to a spectral calibration method of an airborne spatially modulated hyperspectral imager. [0002] It belongs to the technical field of optical detection. Background technique [0003] The key to spectral calibration is to determine the maximum optical path difference of the spatially modulated long-wave infrared imaging spectrometer. The ultimate goal is to determine the central wavelength of each spectral segment of the spectral data. Imaging spectrometer for spectral calibration. Due to the narrow laser bandwidth, high-precision calibration results can be obtained. Spatial modulation long-wave infrared imaging spectrometers generally use laser interferometry data for laboratory spectral calibration; Rapid changes in the space environment such as severe vibration, air pressure and temperature, and attenuation of dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28
CPCG01J3/2823G01J2003/2826
Inventor 余春超杨智雄袁小春王海洋严敏付艳鹏郑为建雷正刚
Owner KUNMING INST OF PHYSICS
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