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...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/14/6326 |
| _version_ | 1797587508002816000 |
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| author | Mingyuan Dong Honghai Shen Ping Jia Yang Sun Chao Liang Fan Zhang Jinghua Hou |
| author_facet | Mingyuan Dong Honghai Shen Ping Jia Yang Sun Chao Liang Fan Zhang Jinghua Hou |
| author_sort | Mingyuan Dong |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-11T00:40:54Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T00:40:54Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-4a04869b2931494db0ce5891547295ef2023-11-18T21:16:09ZengMDPI AGSensors1424-82202023-07-012314632610.3390/s23146326Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium StateMingyuan Dong0Honghai Shen1Ping Jia2Yang Sun3Chao Liang4Fan Zhang5Jinghua Hou6Key Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences, Changchun 130033, ChinaKey Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences, Changchun 130033, ChinaKey Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences, Changchun 130033, ChinaKey Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences, Changchun 130033, ChinaKey Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences, Changchun 130033, ChinaKey Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences, Changchun 130033, ChinaJiuquan Satellite Launch Center, Jiuquan 732750, ChinaAirborne 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.https://www.mdpi.com/1424-8220/23/14/6326airborne infrared optical systemradiometric calibrationinternal stray radiationnon-thermal equilibrium state |
| spellingShingle | Mingyuan Dong Honghai Shen Ping Jia Yang Sun Chao Liang Fan Zhang Jinghua Hou Calibration Method for Airborne Infrared Optical Systems in a Non-Thermal Equilibrium State Sensors airborne infrared optical system radiometric calibration internal stray radiation 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 | airborne infrared optical system radiometric calibration internal stray radiation non-thermal equilibrium state |
| url | https://www.mdpi.com/1424-8220/23/14/6326 |
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