Noise equivalent temperature difference calibration method for temperature measurement thermal infrared imager

Abstract

The invention discloses a noise equivalent temperature difference calibration method for a temperature measurement thermal infrared imager, and the method comprises the following steps: 1, enabling the emissivity and other parameters of a to-be-measured thermal infrared imager to be consistent with those of a target blackbody radiation source; 2, respectively selecting two temperature points for calculation, and taking the two temperature points as calculation areas; and 3, setting a double-blackbody radiation source, enabling the target radiation blackbody to be higher than the background temperature and stabilized at the differential temperature of the target radiation blackbody and the background radiation blackbody, and calculating the noise equivalent temperature difference on the selected calculation area according to a certain formula. The double-blackbody radiation source is adopted to calibrate the noise equivalent temperature difference of the temperature measurement thermalinfrared imager, field calibration is facilitated, disassembly and reassembly are convenient and rapid, the overall measurement system is simple, and the field calibration requirement of the temperature measurement thermal infrared imager can be met.

Description

technical field [0001] The invention relates to the field of noise equivalent temperature difference calibration, in particular to a method for calibrating noise equivalent temperature difference of a temperature measuring infrared thermal imager. Background technique [0002] At present, the measurement of the noise equivalent temperature difference of the infrared thermal imager in the laboratory is generally composed of a differential blackbody radiation source, a target, an infrared collimation optical system, a frame sampler, a computer, and measurement and control software, such as figure 1 As shown, the infrared collimating optical system consists of a flat mirror and an off-axis parabolic mirror to form a collimating optical path. The target is placed on the focal plane of the collimator. The surface of the target is coated with a high-emissivity black coating, usually called a radiation target, to provide a uniform background with high thermal stability. The temper...

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Problems solved by technology

[0003] In view of the problems existing in the calibration of the noise equivalent temperature difference of the temperature measuring infrared thermal imager above, the present invention aims at the existing calibration technology and measurement system, and designs a noise equivalent temperature difference calibration device based on a portable temperature measuring infrared thermal imager. , providing a method for calibrating the equivalent temperature difference of the noise of the temperature measuring infrared thermal imager to meet the needs of on-site calibration of the noise equivalent temperature difference of the temperature measuring infrared thermal imager

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