On-star calibration method for space modulation type interference spectrum imager

A technology of interferometric spectral imaging and spatial modulation, which is applied in the field of on-board calibration of spatially modulated interferometric spectral imagers, which can solve the problem that the background technology cannot realize the calibration of space-borne interferometric hyperspectral imagers, and cannot perform radiometric calibration at the same time and spectral calibration issues

Inactive Publication Date: 2005-07-06
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The invention solves the technical problem that the background technology cannot realize the calibration of the space-borne interferometric hyperspectral imager, that is, the radiometric calibration and the spectral calibration cannot be performed at the same time

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  • On-star calibration method for space modulation type interference spectrum imager

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Embodiment Construction

[0035] The spectrum curve of the light source of the calibration system of the present invention can be measured in advance. The spectrum of the tungsten-halogen lamp is relatively flat. After passing through the integrating sphere system, there will be some sharp absorption peaks on the spectral line. The number and position of the absorption peaks are related to the material of the integrating sphere. The flat part of the spectrum is used for radiometric calibration, and the position of the absorption peak and the full width at half maximum are used for spectral calibration.

[0036] Referring to the accompanying drawings, the present invention consists of Cora Lighting System , Integrating sphere system and Collimating mirror system composition.

[0037] 1. by Cora lighting system or integrating sphere system The light source emits a uniform surface light source with a flat spectral curve, enters the integrating sphere 4 from the entrance 3, and obtains a surface li...

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Abstract

This invention relates to a space modulation interference spectrum image apparatus scaling method, which comprises the following steps: the spectrum curve flat even light source enters the integral ball; the source spectrum curve generates the absorption peaks; it generates the parallel light with certain visual angle through calibration lens system to measure the scaling source spectrum curve by device. The scaling light source generates interference image on the detector array through interference device, Fourier lens, and column prism through spectrum image front lens. It gets the spectrum curve of the scaling source through computer restoring. It compares the spectrum curve with the pre-set spectrum curve to get the needed scaling parameters.

Description

technical field [0001] The invention relates to an on-board calibration method for a space modulation type interference spectrum imager. Background technique [0002] Interferometric spectral imaging technology, also known as interferometric imaging spectroscopy technology, was developed in the 1990s and uses remote sensing observation methods. On-board calibration is one of its core key technologies, and it is currently in the research stage internationally. [0003] In engineering practice, due to the nature of materials, the accuracy of installation and other reasons, there will always be a certain gap between the target information obtained by the instrument and the actual target. It is necessary to obtain corrected parameters through calibration to make the results obtained by the instrument as close as possible to the actual target situation. , so calibration is required. [0004] The calibration of the interferometric hyperspectral imager is different from that of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/26
Inventor 相里斌黄旻计忠瑛王忠厚袁艳李立英
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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