CCD imaging spectrometer image correcting method

An imaging spectrometer and image correction technology, which is applied in the direction of spectrometry/spectrophotometry/monochromator, instrument, scientific instrument, etc., can solve the problem of inconsistency of pixel response, inconsistency of dark current in spectral image imaging, and influence on later data Inversion accuracy and other issues to achieve the effect of eliminating dark current errors

Inactive Publication Date: 2019-03-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for correcting the spectral image of a CCD imaging spectrometer to solve the problem that the pollution signal doped in the spectral data in the prior art affects the accuracy of later data inversion, the dark current at the time of spectral image imaging is inconsistent, and the pixel response is inconsistent The problem

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[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] Such as figure 1 Shown, a kind of CCD imaging spectrometer image correction method of the present invention, concrete steps are as follows:

[0050] The first step, CCD dark current correction, includes two aspects: temperature inconsistency at the time of imaging and inconsistency in space-dimensional dark current. The specific implementation is as follows:

[0051] Step (1), the actual on-orbit observation or calibration process may produce different degrees of temperature difference, and the visible channel does not have temperature control, dark current correction is necessary. The temperature influence factor is introduced into the dark current correction algorithm, and the dark current of the image plane is corrected by using the temperature influence factor. Assuming that the dark current generation rate f dc (t) remains unchan...

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Abstract

The invention discloses a CCD imaging spectrometer image correcting method. A CCD imaging spectrometer forward data model is built for formulating noise and deviation in the CCD imaging process for reversing the later spectrum image data correcting process. In the spectrum imaging modeling process, corresponding parameters calibrated by a laboratory need to be adopted. Firstly, a dark current temperature correction factor is added for correcting the spectrum image dark current, and according to an imaging model, the space dimension dark current inconsistency is corrected. Secondly, according to the frame transfer time and the exposure time, the smear signal size is calculated by adopting the charge number as the standard. Finally, the CCD pixel response non-uniformity is collected throughuniform light radiation. By adopting the method, deviation and noise in the CCD imaging process can be effectively removed, and the later data inversion accuracy is improved.

Description

technical field [0001] The invention relates to the field of ambient atmospheric environment detection, in particular to an image correction method for a CCD imaging spectrometer. Background technique [0002] Atmospheric trace gases can directly or indirectly participate in the physical and chemical cycles of the earth's atmosphere, and the secondary pollutants produced may cause adverse effects on the atmosphere and the ecological environment, such as the formation of photochemical smog, the destruction of the ozone layer and the occurrence of acid rain and other major environmental pollution problems. As an advanced means of detecting environmental pollution information, optical remote sensing technology has been increasingly widely used due to its unique advantages such as dynamic observation and large-area simultaneous observation. Differential optical absorption spectroscopy (DOAS, differential optical absorption spectroscopy) is based on the Beer-Lambert law of light ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28
CPCG01J3/2823G01J2003/2843
Inventor 张泉黄书华赵欣周海金赵敏杰常振邱晓晗司福祺
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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