Two-point correction method for uncooled infrared detector

Abstract

The invention discloses a two-point correction method for an uncooled infrared detector. According to the method, two kinds of materials different in radiation rate are utilized as blocking pieces toconduct two-point correction on the detector. Firstly, a two-point correction system for the uncooled infrared detector is constructed, wherein the two-point correction system comprises the blocking piece A, the blocking piece B, the detector, an output circuit module, a blocking piece control module and an FPGA data processing module; secondly, the detector and the output circuit module are utilized to collect analog signals and convert the analog signals into digital signals; thirdly, the blocking piece control module is utilized to control the blocking piece A and the blocking piece B to appear in front of a glass window of the detector in order to obtain different radiation fluxes; finally, the FPGA data processing module is utilized to achieve two-point nonuniform correction through the utilization of collected data. By means of the method, the bias and gain of a photosensitive element of the detector are both compensated for, and the imaging quality is effectively improved.

Description

technical field [0001] The invention relates to a calibration method for an infrared detector, in particular to a two-point calibration method for an uncooled infrared detector. Background technique [0002] The detector assembly is a key component of the infrared thermal imaging camera, but its inherent non-uniformity seriously affects the imaging quality of the infrared imaging system. Since the uncooled infrared detector usually uses a black body for non-uniform correction, the scanning movement of the scanning mechanism makes the scene and the high and low temperature black body simultaneously imaged during imaging, and then the calculation of the correction coefficient is completed. It is difficult to use normally in the field test, and usually use a baffle for correction, resulting in unsatisfactory correction effect. Therefore, it is necessary to find a simple and convenient reference source to correct the response of the detector more reasonably. [0003] The metho...

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Problems solved by technology

[0004] The purpose of this method is to provide a two-point calibration method for uncooled infrared detectors in field tests, and to solve the problem that the single-point calibration with a single baffle in the past is too noisy in the test.

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