Calibration method, device and system for infrared thermal imager

Abstract

The invention belongs to the field of infrared detection technology, and provides a calibration method, device and system for infrared thermal imager. The method comprises the following steps: acquiring the temperature of the standard blackbody, the grayscale of the image corresponding to the standard blackbody, and the detector temperature; working out coefficients of the quadratic function calibration equation according to the quadratic function, the temperature of the standard blackbody and the grayscale of the image corresponding to the standard blackbody; working out nine parameters of the quadratic function temperature excursion equation according to the quadratic function temperature excursion equation, coefficients of the quadratic function calibration equation, and the detector temperature; determining the corresponding temperature of the target object according to the nine parameters of the quadratic function temperature excursion equation, the quadratic function temperature excursion equation, the quadratic function calibration equation, and the pre-acquired image grayscale of the target object. The calibration method, device and system for infrared thermal imager can effectively calibrate the infrared thermal imager, with high accuracy and small error, improving the performance of the device.

Description

technical field [0001] The invention relates to the technical field of infrared detection, in particular to a calibration method, device and system for an infrared thermal imager. Background technique [0002] At present, thermal imaging cameras must be calibrated before leaving the factory, also known as indoor calibration or laboratory calibration, and must be calibrated regularly after leaving the factory to test the performance of the system. If the on-site environment is quite different from the calibration environment, it is also necessary to perform on-site calibration of the equipment to ensure the temperature measurement accuracy of the tested target. The so-called calibration is the work of correcting the measurement results of the infrared thermal imaging camera with a standard black body radiation source - obtaining the relationship between the digital output of the infrared thermal imaging camera and the radiance received by the infrared thermal imaging camera. ...

AI Technical Summary

Problems solved by technology

[0003] In particular, uncooled infrared detectors are easily affected by ambient temperature, distance, core temperature, or the working temperature effect of the detector, and the lens. However, the existing calibration methods are complicated in processing and poor in accuracy, which seriously affects the infrared thermal performance. The accuracy and reliability of the imager in temperature detection

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