Noise equivalent temperature difference device of thermal infrared imager with ultra-large field of view and test method

Abstract

The invention provides a noise equivalent temperature difference device of a thermal infrared imager with an ultra-large field of view and a test method. A blackbody controller is connected with a blackbody radiation source, the blackbody radiation source provides the radiation energy; a light source incident from a black body is converted into a parallel light source through a collimating light tube to enter an infrared imaging system; the infrared imaging system is aligned with the center of the view field of the collimating light tube and transmits test data to an industrial personal computer; the industrial personal computer collects gray scale data from the infrared imaging system; and temperature control is conducted on the black body radiation source through the black body controller. According to the invention, the problem that the equivalent temperature difference of the infrared noise with the ultra-large field of view cannot be tested is solved and a test result meeting theprecision requirement is obtained; a three-dimensional noise model is introduced and time noise and space noise are subdivided into seven components, so that the noise of the infrared imaging system is comprehensively evaluated. According to the invention, the original gray scale data are sampled without being influenced by an image processing algorithm, so that the test accuracy is effectively improved.

Description

technical field [0001] The invention relates to the field of infrared imaging, in particular to a noise equivalent temperature difference device and a testing method for an infrared imaging system. Background technique [0002] The infrared imaging system obtains the heat map distribution of the target and the background by detecting the infrared radiation characteristics. The noise equivalent temperature difference is one of the main performance parameters of the infrared imaging system, which can characterize the temperature sensitivity of the system to the target. Through the laboratory data test of the noise equivalent temperature difference, the working distance of the infrared imaging system can be evaluated. [0003] Traditional noise equivalent temperature difference test equipment includes black body radiation source, target target plate, collimated light pipe, analog video acquisition equipment, calculation software and monitor. The schematic diagram of the test ...

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Problems solved by technology

[0011] 3) The signal transfer function of the infrared system is the ratio of the signal value corresponding to the temperature difference between the target and the background and the temperature difference between the target and the background. Due to the test environment and test

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