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Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State

Airborne infrared optical systems equipped with multiple cooled infrared cameras are commonly utilized for quantitative radiometry and thermometry measurements. Radiometric calibration is crucial for ensuring the accuracy and quantitative application of remote sensing camera data. Conventional radio...

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Autores principales: Dong, Mingyuan, Shen, Honghai, Jia, Ping, Sun, Yang, Liang, Chao, Zhang, Fan, Hou, Jinghua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10385590/
https://www.ncbi.nlm.nih.gov/pubmed/37514619
http://dx.doi.org/10.3390/s23146326
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author Dong, Mingyuan
Shen, Honghai
Jia, Ping
Sun, Yang
Liang, Chao
Zhang, Fan
Hou, Jinghua
author_facet Dong, Mingyuan
Shen, Honghai
Jia, Ping
Sun, Yang
Liang, Chao
Zhang, Fan
Hou, Jinghua
author_sort Dong, Mingyuan
collection PubMed
description Airborne infrared optical systems equipped with multiple cooled infrared cameras are commonly utilized for quantitative radiometry and thermometry measurements. Radiometric calibration is crucial for ensuring the accuracy and quantitative application of remote sensing camera data. Conventional radiometric calibration methods that consider internal stray radiation are usually based on the assumption that the entire system is in thermal equilibrium. However, this assumption leads to significant errors when applying the radiometric calibration results in actual mission scenarios. To address this issue, we analyzed the changes in optical temperature within the system and developed a simplified model to account for the internal stray radiation in the non-thermal equilibrium state. Building upon this model, we proposed an enhanced radiometric calibration method, which was applied to the absolute radiometric calibration procedure of the system. The radiometric calibration experiment, conducted on the medium-wave channel of the system within a temperature test chamber, demonstrated that the proposed method can achieve a calibration accuracy exceeding 3.78% within an ambient temperature range of −30 °C to 15 °C. Additionally, the maximum temperature measurement error was found to be less than ±1.01 °C.
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spelling pubmed-103855902023-07-30 Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State Dong, Mingyuan Shen, Honghai Jia, Ping Sun, Yang Liang, Chao Zhang, Fan Hou, Jinghua Sensors (Basel) Article Airborne infrared optical systems equipped with multiple cooled infrared cameras are commonly utilized for quantitative radiometry and thermometry measurements. Radiometric calibration is crucial for ensuring the accuracy and quantitative application of remote sensing camera data. Conventional radiometric calibration methods that consider internal stray radiation are usually based on the assumption that the entire system is in thermal equilibrium. However, this assumption leads to significant errors when applying the radiometric calibration results in actual mission scenarios. To address this issue, we analyzed the changes in optical temperature within the system and developed a simplified model to account for the internal stray radiation in the non-thermal equilibrium state. Building upon this model, we proposed an enhanced radiometric calibration method, which was applied to the absolute radiometric calibration procedure of the system. The radiometric calibration experiment, conducted on the medium-wave channel of the system within a temperature test chamber, demonstrated that the proposed method can achieve a calibration accuracy exceeding 3.78% within an ambient temperature range of −30 °C to 15 °C. Additionally, the maximum temperature measurement error was found to be less than ±1.01 °C. MDPI 2023-07-12 /pmc/articles/PMC10385590/ /pubmed/37514619 http://dx.doi.org/10.3390/s23146326 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dong, Mingyuan
Shen, Honghai
Jia, Ping
Sun, Yang
Liang, Chao
Zhang, Fan
Hou, Jinghua
Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State
title Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State
title_full Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State
title_fullStr Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State
title_full_unstemmed Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State
title_short Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State
title_sort calibration method for airborne infrared optical systems in a non-thermal equilibrium state
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10385590/
https://www.ncbi.nlm.nih.gov/pubmed/37514619
http://dx.doi.org/10.3390/s23146326
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