Radiation calibration method suitable for rapid quantification processing of thermal imager

Abstract

The invention provides a radiation calibration method suitable for rapid quantification processing of a thermal imager, and relates to the field of infrared testing, and the method comprises the steps: 1, converting the temperature of a black body into the radiation brightness of the black body according to a Planck formula; 2, reading the relationship between the number of charges received by the detector and the exposure time under different blackbody temperature conditions; and step 3, acquiring charge flux density F corresponding to different blackbody temperatures through a calibration experiment, and performing linear fitting on the blackbody temperatures and the charge flux density F. Therefore, the radiometric calibration parameter does not depend on the exposure time of the thermal infrared imager any more, and rapid quantitative measurement of the thermal infrared imager and expansion of the temperature range of infrared quantitative measurement are facilitated.

Description

technical field [0001] The invention relates to the field of infrared testing, in particular to a radiation calibration method suitable for rapid quantitative processing of a thermal imager. Background technique [0002] The radiation calibration of the infrared thermal imager is the basis for the quantitative measurement of the infrared thermal imager. The laboratory radiation calibration is calculated by using the algorithm to calculate the calibration from the radiance value L measured by different infrared thermal imagers and the digital count DN of the image. Coefficients Gain and Offset. Such as figure 1 As shown, the current common laboratory radiation calibration includes the following steps: (1) set the infrared thermal imager to perform non-uniform correction on the infrared thermal imager at a certain exposure time, and use the blackbody radiation source as the standard; (2) pass Calculate the blackbody radiation brightness value L by the blackbody radiation tem...

AI Technical Summary

Problems solved by technology

Since the exposure time of the infrared thermal imager needs to be changed according to the radiation intensity of the target during the test, it is difficult to guarantee the exposure time of the infrared thermal imager for radiation calibration and the exposure time used for testing. This is very unfavorable for real-time acquisition of quantitative data from thermal imaging cameras and rapid quantitative measurement of thermal imaging cameras

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