Thermal imager radiation calibration accuracy analysis method

A technology of radiation calibration and analysis method, which is applied in the field of thermal imager radiation calibration accuracy analysis

Inactive Publication Date: 2018-04-24
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

Obviously, the accuracy of radiometric calibration will affect the accuracy of restored radiance, but there is no relevant analysis on how the uncertainty obtained from the square and root of each uncertainty component is used for the data quality of infrared measurement data

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  • Thermal imager radiation calibration accuracy analysis method
  • Thermal imager radiation calibration accuracy analysis method
  • Thermal imager radiation calibration accuracy analysis method

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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many of the details listed in the specification are only for readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0052] A thermal imaging camera radiation calibration accuracy analysis method provided in this embodiment, its flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0053] (1) Carry out the radiation calibration experiment of the infrared thermal imager to determine the radiation calibration coefficient.

[0054] In this embodiment, radiation calibration based on a standard blackbody radiation source is used as an example. ...

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Abstract

The invention discloses a thermal imager radiation calibration accuracy analysis method. The method comprises the following steps that: (1) an infrared thermal imager radiometric calibration experiment is performed, and a radiometric calibration coefficient is determined; (2) the sources of uncertainties influencing entrance pupil radiance in a process when a standard blackbody radiation source isadopted to perform radiometric calibration, and the relative uncertainty magnitudes of influence quantities are analyzed; (3) the relative uncertainty magnitude and probability distribution form of the entrance pupil radiance are synthesized, the magnitudes of introduced uncertainty components are analyzed, and the standard deviation of the radiance is synthesized; (4) the uncertainties and probability distribution form of the radiometric coefficient are calculated, a corresponding relation between the recovered radiance and DN value of a thermal imager is obtained; (5) the uncertainty and probability distribution of the recovered radiance of the thermal imager are obtained; and (6) the actual entrance pupil radiance of the thermal infrared imager is determined. The thermal imager radiation calibration accuracy analysis method of the invention is used for evaluating the reliability of the radiance measurement of the infrared thermal imager, and can improve calibration accuracy and improve data quality.

Description

technical field [0001] The invention relates to the technical field related to a thermal imager, in particular to a method for analyzing radiation calibration accuracy of a thermal imager. Background technique [0002] The physical quantity to be measured in the infrared camera test is the radiance L of the ground scene pixel, and the output signal of the thermal imager is the gray value DN of the image. To convert the signal obtained by the thermal imager into the radiance value, it is necessary to Radiation calibration process. The thermal imager radiation calibration process is the transfer process of radiation standards. After a multi-stage transfer process, the primary black body radiation source standard is finally transferred to the thermal imager entrance pupil radiation brightness standard, and the thermal imager detector response value and the entrance pupil are obtained. Corresponding relationship of radiance. However, various instruments and parameters used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00G01J1/00
CPCG01J1/00G01J5/00G01J2005/0077G01J5/80
Inventor 雷浩
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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