Influence and correction of infrared window on package blackbody radiation ideality

L. Q. Meng; J. Y. Zhang; X. Z. Mou; P. Shen; S. Xu

doi:10.1117/12.3023628

18 March 2024 Influence and correction of infrared window on package blackbody radiation ideality

L. Q. Meng, J. Y. Zhang, X. Z. Mou, P. Shen, S. Xu

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131044Q (2024) https://doi.org/10.1117/12.3023628
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Contemporary airborne and missile borne infrared detectors rely on blackbody real-time wide temperature range radiation correction to achieve high-precision detection of targets. A thermal optical coupling simulation model of a surface source blackbody target is established to address the issue of the influence of encapsulated infrared windows on the ideality of blackbody in a wide temperature range. The Monte Carlo ray tracing method is used to analyze the influence of windows on the apparent radiation flux of blackbody in the original infrared band and the internal factors. A calibration temperature correction that conforms to the actual apparent radiation flux is proposed and verified. The results show that when the calibration temperature is between -50°C to+50°C, the lower the calibration temperature is below the ambient temperature, the greater the positive error between the calibration temperature and the actual apparent radiation flux corresponding to the apparent temperature. Conversely, the negative error increases, with a maximum of - 4°C to+13°C. This is because the window has the effect of enhancing stray radiation and attenuating target surface emission radiation in a forward and inverse game, which affects the apparent radiation flux. Based on this, a calibration temperature correction method is proposed to associate environmental temperature with calibration temperature. The maximum error of the corrected calibration temperature is reduced by more than 50% in experimental measurements, which improves the accuracy of infrared calibration based on packaged blackbody.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

L. Q. Meng, J. Y. Zhang, X. Z. Mou, P. Shen, and S. Xu "Influence and correction of infrared window on package blackbody radiation ideality", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131044Q (18 March 2024); https://doi.org/10.1117/12.3023628

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KEYWORDS

Black bodies

Calibration

Windows

Temperature metrology

Infrared radiation

Signal attenuation

Infrared detectors

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