Temperature measurement correction system and method for thermal infrared imager

Abstract

The invention provides a temperature measurement correction system and method for a thermal infrared imager. The system includes an infrared optical module, a plane black body and a high and low temperature box arranged in the thermal infrared imager, wherein a focal plane of the to-be-corrected thermal infrared imager is aligned with the plane black body through the infrared optical module, radiation of the plane black body is uniformly irradiated on the focal plane, a preset distance between the to-be-corrected thermal infrared imager and the plane black body is kept, the to-be-corrected thermal infrared imager is placed in the high and low temperature box for preheating, and subsequent calibration is performed after the temperature is stabilized. The system is advantaged in that the distance of a measured object is compensated by an optical system, influence of surface emissivity of the measured object and the environment temperature on temperature measurement is compensated by thecorrection method, the thermal infrared imager is made to be more adaptable to the measured object and the environment, gain and the bias effect of the thermal infrared imager on external radiation under different temperatures are accurately calibrated, a temperature measurement error caused by temperature change of an instrument in the temperature measurement process is avoided, an additional device such as a shutter is not needed for calibration, and the structure of the instrument is simplified.

Description

technical field [0001] The invention relates to the technical field of infrared thermal imaging, in particular to a temperature measurement and correction system and method for an infrared thermal imager. Background technique [0002] Infrared thermal imaging thermometer is a device that can intuitively reflect the heat distribution on the surface of the measured object and can perform accurate temperature measurement. It converts the infrared radiation signal of the object into an electrical signal through a photoelectric conversion device, and then displays it in the form of an image. The thermal image only gives a qualitative description of the radiation temperature on the surface of the object. If you want to obtain the absolute temperature of the object through the thermal image, you must compare it with the thermal image of the reference object to calibrate the absolute temperature value. [0003] The relationship between the infrared radiation received by the infrare...

AI Technical Summary

Problems solved by technology

The traditional thermal imager calibration method is to calibrate under specific ambient temperature, distance and other conditions, and there is no good way to compensate for the influence of other factors

In the actual temperature measurement process, due to changes in the external environment, measurement distance, and the operating temperature of the thermal imager, especially when the operating conditions are greatly different from the calibration conditions, the measurement accuracy will be significantly reduced

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