Method for calibrating thermal infrared imager

Abstract

The invention provides a method for calibrating a thermal infrared imager. The method, by correcting dynamic range and focal plane temperature of the thermal infrared imager, takes comprehensive considerations of impact factors from temperature drift effects and ge-window attenuating effects, and establishes the function relation between temperatures and the response of the thermal infrared imager after correction so as to calibrate the thermal infrared imager. According to the invention, the method is intended for calibrating the thermal infrared imager, can at the same time calibrate a plurality of thermal infrared imagers, can calibrate accurately and has strong applicability.

Description

technical field [0001] The present invention relates to the field of infrared technology, more specifically, to a method for calibrating an infrared thermal imager. Background technique [0002] The infrared thermal imaging camera uses the infrared detector and the optical imaging objective lens to receive the infrared radiation energy of the measured target, and reflects it on the photosensitive element of the infrared detector to obtain an infrared thermal image. This kind of thermal image corresponds to the thermal distribution field on the surface of the object. Therefore, in addition to imaging, the infrared thermal imager can also measure the temperature by using the different amounts of energy radiated by the object. The temperature measurement of infrared thermal imager is non-contact, and it is widely used in fire protection, electric power, fault diagnosis and other industries. [0003] After the thermal imaging camera is assembled, after non-uniformity correction...

AI Technical Summary

Problems solved by technology

This calibration method is simple and easy to implement, but it has the following shortcomings: First, the adaptability to the environment is not strong

On the one hand, because the infrared thermal imaging camera is a non-contact temperature measurement, it will be affected by the ambient temperature of the atmosphere. The above calibration method is only carried out at a certain ambient temperature. When the ambient temperature changes, the temperature measurement accuracy will be affected.

On the other hand, the response of the infrared detector will change with the ambient temperature. If it is not adjusted in real time, the response will be saturated or cut off. Second, the above calibration method can only be applied to the situation without a germanium window, but When the thermal imager is actually used, in many cases, it is necessary to add a germanium window in front of the lens to protect the optical system and the infrared detector; thirdly, the above calibration method does not consider the individual differences of the thermal imager It must be calibrated separately for each unit, which is not conducive to mass production

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