Calibration method for infrared temperature measuring device

By establishing a spectral average emissivity model using a blackbody calibration source and radiation theory, the gain and bias values ​​of the infrared thermometer are automatically corrected, solving the problem of decreased accuracy of the infrared thermometer after lens changes and achieving efficient and accurate calibration.

CN120947825APending Publication Date: 2025-11-14WUHAN GUIDE SENSMART TECH CO LTD
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Patent Information

Application Number
CN202511172430.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-21
Publication Date
2025-11-14

AI Technical Summary

Technical Problem

Existing infrared temperature measurement devices suffer from decreased temperature measurement accuracy and complex, inefficient calibration processes after replacing extended lenses, adjusting apertures, or adding windows. The calibration results are also susceptible to environmental interference and lack adaptability to various scenarios.

Method used

By employing a blackbody calibration source combined with radiation balance theory and Kirchhoff's thermal radiation law, the gain and bias values ​​are automatically corrected through calculation of spectral radiance and response model, thus achieving simple calibration.

Benefits of technology

It improves the convenience and adaptability of calibration, ensuring temperature measurement accuracy of ±2℃ in various application scenarios and any environment, and simplifies the calibration process.

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Abstract

The invention relates to the technical field of infrared temperature measurement, in particular to a calibration method for an infrared temperature measurement device, and the method comprises the steps: calculating a first spectral radiation quantity at a reference temperature and a second spectral radiation quantity at an ambient temperature; based on the first spectral radiation quantity and the second spectral radiation quantity, the spectral average emissivity of the target surface of the blackbody calibration source at the reference temperature is obtained, the third spectral radiation quantity of a calibration temperature reference value is obtained through calculation, reverse calculation is conducted on the third spectral radiation quantity, and the calibration temperature reference value is obtained; a response model is constructed based on a calibration temperature reference value, a gain coefficient and a bias coefficient are obtained by solving the response model, a gain value of the infrared temperature measuring device is corrected based on the gain coefficient, and a bias value of the infrared temperature measuring device is corrected based on system bias. The whole calibration process of the method is convenient and easy to operate.
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