Athermal Performance of A Dual-Band LOROP Sensor with an All-SiC Telescope

Nam, Jung Rim; Yoo, Jae‐Hyoung; Kim, Young Ho; Kim, Youngsoo

doi:10.3938/jkps.76.458

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The reduction or elimination of CTE mismatch, which is simple and much more straightforward, has been widely used. Typically, all-SiC optical modules have also been reported [ 18 , 19 , 20 ]. This type of optomechanical system can significantly reduce the mirror surface thermal deformation sensitivity, while still maintaining excellent support stiffness.…”

Section: Introductionmentioning

confidence: 99%

Contributions of Support Point Number to Mirror Assembly Thermal Sensitivity Control

Zhang

Ding

et al. 2023

Sensors

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Due to the extreme environmental temperature variations, solutions that enable ultra-low thermal sensitivity in a mirror assembly are crucial for high-performance aerial optical imaging sensors (AOIS). Strategies such as the elimination of the coefficient of thermal expansion (CTE) mismatch and the employment of a flexure connection at the interface cannot be simply duplicated for the application involved, demanding specific design constraints. The contributions of support point number to the surface thermal sensitivity reduction and support stiffness improvement have been studied. A synthetic six-point support system that integrates equally spaced multiple ultra-low radial stiffness mirror flexure units and assembly external interface flexure units has been demonstrated on a 260 mm apertured annular mirror that involves significant CTE mismatch and demanding support stiffness constraint. The surface deformation RMS, due to the 35 °C temperature variation, is 16.7 nm.

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Section: Introductionmentioning

confidence: 99%

Contributions of Support Point Number to Mirror Assembly Thermal Sensitivity Control

Zhang

Ding

et al. 2023

Sensors

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“…In the context of airborne multi-band photoelectric infrared systems, there are two key considerations. Firstly, due to limitations in space and power on the airborne platform, these systems are designed to be extremely compact [ 2 , 3 , 6 , 7 ]. Secondly, the optical instrument within the IR channel exhibits high emissivity, which results in significant internal stray radiation that greatly influences the received radiation signal by the IRFPA.…”

Section: Introductionmentioning

confidence: 99%

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

Dong

Shen

Jia

et al. 2023

Sensors

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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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Athermal Performance of A Dual-Band LOROP Sensor with an All-SiC Telescope

Cited by 2 publications

References 9 publications

Contributions of Support Point Number to Mirror Assembly Thermal Sensitivity Control

Contributions of Support Point Number to Mirror Assembly Thermal Sensitivity Control

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

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