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Method for improving absolute radiometric calibration precision of aviation TDI infrared scanner

An absolute radiometric calibration and scanner technology, which is applied in the field of improving the absolute radiometric calibration accuracy of TDI infrared scanners, and can solve problems such as insufficient response stability of infrared detectors.

Inactive Publication Date: 2020-07-14
TIANJIN JINHANG INST OF TECH PHYSICS
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the absolute radiation calibration of aviation TDI infrared scanners, which is used to solve the problem of insufficient response stability of existing domestic infrared detectors

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  • Method for improving absolute radiometric calibration precision of aviation TDI infrared scanner
  • Method for improving absolute radiometric calibration precision of aviation TDI infrared scanner
  • Method for improving absolute radiometric calibration precision of aviation TDI infrared scanner

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Embodiment Construction

[0065] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with examples.

[0066] A method for improving the absolute radiation calibration of the aviation TDI infrared scanner of the present invention comprises: (1) establishing a standard response function of the absolute radiation calibration of the full optical path, comprising:

[0067] 1) Control the radiation calibration experimental conditions, including ambient temperature, ambient humidity, ambient lighting, etc., to ensure that the system under test does not receive other radiation and redundant disturbances other than the black body;

[0068] 2) Radiation source selection: use a calibrated absolute temperature black body, and require that 80% of the radiation surface of the black body can cover the full aperture of the optical window of the system;

[0069] 3) Wi...

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Abstract

The invention relates to a method for improving absolute radiometric calibration of an aviation TDI infrared scanner. The method comprises the following steps: establishing a full-optical-path absolute radiometric calibration standard response function; establishing a half-optical-path absolute radiometric calibration standard response function; establishing an absolute radiometric calibration compensation function in the application; and evaluating the absolute radiometric calibration precision; the method comprises the following steps: acquiring full-optical-path target image data in a current startup state; acquiring system response image gray scale data according to the image data; when the sum of the current full-optical-path image gray scale and the compensation gray scale obtained through the absolute radiometric calibration compensation function is used as the absolute correspondence of the system in the current startup state, substituting the compensated full-optical-path image gray scale into an absolute radiometric calibration inversion reference function, and inverting a target temperature; and using the ratio of the absolute value of the difference between the inversion target temperature and the target actual measurement temperature to the temperature dynamic range during inversion reference function calibration as the absolute radiometric calibration precision. According to the invention, the high-stability calibration black body in the half optical path is utilized to compensate the error generated by the drift of the detector, and the absolute radiometric calibration precision is improved.

Description

technical field [0001] The invention relates to a TDI infrared scanner absolute radiation calibration technology, in particular to a method for improving the absolute radiation calibration accuracy of a TDI infrared scanner. Background technique [0002] The optical remote sensing imaging system is developing rapidly in the military and civilian fields, and it is increasingly required to have the ability to acquire wide-range target images. There are two ways to solve wide-range imaging: one is to use a large area array or even a super large area array detector; One adopts long line array TDI detector + swing scan imaging. For infrared detectors, the price of large area array or even super large area array detectors is unaffordable, and the process technology is difficult. Foreign large area array or even super large area array infrared detectors are subject to strict export control and are greatly restricted in engineering applications. . [0003] The aviation infrared TD...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J5/00
CPCG01J3/2823G01J5/00G01J2005/0077G01J5/80
Inventor 霍家全
Owner TIANJIN JINHANG INST OF TECH PHYSICS
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