Method and device for calibrating pixel non-uniformity in ccd ultraviolet band of spaceborne spectrometer
A calibration method and non-uniformity technology are applied in the field of pixel non-uniformity calibration of spaceborne spectrometer CCDs in the ultraviolet band, and can solve the problem that the calibration requirements of spectral imaging CCDs cannot be met.
Active Publication Date: 2020-10-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0011] A pixel non-uniformity calibration method and device in the ultraviolet band of a spaceborne spectrometer CCD proposed by the present invention can solve the technical problem that the traditional technology is only applicable to optical imaging CCDs, but cannot meet the calibration requirements of spectral imaging CCDs
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[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.
[0048] like figure 1 and figure 2 As shown, the pixel non-uniformity calibration method of the space-borne spectrometer CCD ultraviolet band described in the present embodiment includes first setting up a test platform, and the test platform includes a halogen light source 1, and the halogen light source 1 is arranged on the shutter 2, the light emitted by the shutter 2 passes through the grating monochromator 3 to the adjustable slit device 4, and also includes an integrating sphere 5, and the adjustable slit device 4 is connected to the integrat...
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Abstract
The invention discloses a pixel non-uniformity calibrating method of an on-satellite spectrometer CCD ultraviolet waveband and a device thereof, wherein the method and the device can settle technicalproblems of suitability for optical imaging CCD and incapability of satisfying a spectral imaging CCD calibration requirement. The method comprises the steps of establishing a testing platform which comprises a halogen lamp source that is arranged in a light shielding device, wherein light transmitted from the light shielding device is emitted to an adjustable slit device through a grating single-color instrument, wherein the adjustable slit device is connected with an integrating sphere through a fiber; making light output from the integrating sphere to a spot imaging device; outputting a light spot to the on-satellite spectrometer CCD by the spot imaging device. According to the method of the invention, through establishing a quasi-circular light spot uniform illuminating light source, the light spots in different wavebands are generated, and the diameter of the light spots cover a plurality of pixels of the CCD imaging surface, thereby realizing full-waveband scanning imaging of thespectrometer. According to a pixel sequence, illumination is performed on the CCD imaging surface successively, and signal distribution of the CCD pixels is obtained. Through performing Gaussian fitting and least square processing method on the signal, an accurate PRNU calibration equation is obtained.
Description
technical field [0001] The invention relates to the technical field of CCD image processing, in particular to a method and device for calibrating pixel non-uniformity in the CCD ultraviolet band of a spaceborne spectrometer. Background technique [0002] Scientific-grade area array CCD has now become the photodetector device of choice for spectrometers, but scientific-grade CCDs generally have large imaging sizes and deep pixel charge storage potentials, which easily cause pixel response non-uniformity (PRNU) during the imaging process, because manufacturing Due to the process and materials, this phenomenon is especially obvious in the ultraviolet band. [0003] Before the launch of the spaceborne spectrometer, it is necessary to obtain the PRNU parameters of the CCD through ground experiments, which is commonly referred to as CCD flat-field calibration. The specific process of the calibration method used by everyone at this stage is as follows: 1. Use uniform and stable whi...
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IPC IPC(8): G01J3/28
CPCG01J3/28
Inventor 赵欣司福祺
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI