Thermal imager calibration device and method combining non-uniformity calibration and temperature calibration

Abstract

The invention discloses a thermal imager calibration device and method through combination of non-uniformity calibration and temperature calibration. The thermal imager calibration device comprises a black body, an optical system, an infrared detector, an image processing board, a cross slide table, a monitor and a PC. The image processing board comprises a storage module, a correction module and an image processing module. The infrared detector is arranged on the cross slide table. The optical system is arranged in front of the detection surface of the infrared detector. The black body is arranged in front of the optical system. The infrared detector is respectively connected with the storage module and the image processing module. The storage module is respectively connected with the PC and the correction module. The correction module is connected with the image processing module which is then connected with the monitor. The non-uniformity factor introduced by the optical system is fully considered, calibration is performed through an infrared optical lens, two-point correction is integrated in temperature calibration, and the measured data are fully utilized and multipoint correction can be realized so that the effect of non-uniformity correction can be greatly enhanced and the effect of infrared images is enabled to more obvious and clear.

Description

technical field [0001] The invention belongs to infrared thermal imaging technology, in particular to a thermal imager calibration device and method combining non-uniformity calibration and temperature calibration. Background technique [0002] For the optical system of visible light, the stray light mainly comes from the external non-imaging light, while for the infrared optical system, the stray light mainly comes from the internal reflection and surface thermal radiation, which will reach the image surface of the detector through the optical system, Thus introducing unnecessary noise. At the same time, both the absorption of the optical element medium and the reflection at the interface cause energy loss, making the energy of the imaging light weak. [0003] There is still a big difference between the actual optical system and the theoretical optical system, and there are aberrations and diffraction in the optical system. Light rays from a point converged by a lens ofte...

AI Technical Summary

Problems solved by technology

[0004] In the past, when performing black body calibration, usually without an optical lens, although this is beneficial to more accurately calibrate the value of each pixel point during calibration, it also ignores that the actual measurement is to be measured by an optical system , so the problems introduced by the optical system are often ignored

[0005] If the non-uniformity calibration and temperature calibration are performed separately, the workload will be doubled, and it cannot be guaranteed that the two calibrations are performed in the same environment, which increases the error

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