Analysis and correction of stray thermal radiation in infrared optical systems including an experimental case study

Yang, Zuodong; Ma, Yong-Hui; Guo, Juguang; Jiang, Weiwei; Geng, Aihui

doi:10.1364/ao.58.003582

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…The transmission of radiation undergoes refraction, reflection, and scattering by various optical and mechanical structures, rendering it highly intricate. To facilitate processing, simplified models are commonly employed for description and analysis [ 1 , 16 , 19 ].…”

Section: Inner Stray Radiation Model and Calibration Methodsmentioning

confidence: 99%

“…For cooled infrared imaging systems, several scholars [ 16 , 17 , 18 , 19 ] have analyzed the influence of internal stray radiation on the total response of the system and have established simplified models of internal stray radiation. He et al [ 20 ] focused on analyzing the impact of key factors, such as the radiation rate, ambient temperature, and working temperature, on the temperature measurement error.…”

Section: Introductionmentioning

confidence: 99%

“…Radiometry and thermometry are the reverse processes of radiometric calibration. Once the grayscale value of the target is obtained, it can be incorporated into Equation (16) to calculate the target's radiance or intensity. The disparity between the target radiance and the actual value is defined as the calibration error, which serves as a metric for evaluating the calibration accuracy.…”

mentioning

confidence: 99%

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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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Section: Inner Stray Radiation Model and Calibration Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Dong

Shen

Jia

et al. 2023

Sensors

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“…Obviously, the smaller the PST, the stronger the system's ability to suppress the stray light [17][18][19][20] . Statistics of the stray light energy reached the detector and the PST at different angles of incidence are shown in Table 1.…”

Section: Design Of Eliminating Stray Lightmentioning

confidence: 99%

Analysis and inhibition of the stray light on space-based camera with wide field

Zhang

Hao

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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In view that the sun is a main stray light source for space-based camera with wide filed as high-intensity light, the influence on the image quality of the camera was studied. Through the design of the camera’s lens hood, the number of stray lights scattering on the surface of the lens is reduced. Then the stray light which can reach the detector is diminished. Compare the image quality of the flying surveillance camera with which before the lens hood designed, the maximum value of PST(θ) outside the critical angle 55° was reduced to 1.1099×10-9. Stray light was significantly inhibited, and the image quality was effectively improved.

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“…In order to quantitatively study the distribution of stray radiation, the simulation method is widely used to analyze the stray radiation in optical imaging systems [6][7][8][9][10]. Although there are many simulation methods to effectively predict and analyze the stray light of infrared imaging optical systems, the causes of stray radiation are very complex, which are related not only to the design, manufacturing process, and material characteristics of the infrared imaging system, but also to the aberration, target surface characteristics, and thermal radiation of system components.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Stray Radiation Suppression in Infrared Imaging System Using a Novel Broadband and High-Absorption Ceramic Coating

et al. 2021

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Aiming at addressing the vulnerability of the infrared imaging opto-mechanical system to stray radiation interference caused by an external laser, a new method with a broadband and high-absorptivity ceramic coating on the inner wall of the system is proposed to reduce the stray radiation intensity, which is helpful to improve the imaging quality of the detection image. Based on plasma electrolytic oxidation (PEO) technology, the preparation method and properties of a novel ceramic coating are studied, and a long-wave infrared imaging optical system with high-absorption ceramic coating is designed and developed. It is verified for the first time that the high-absorption ceramic coating can suppress the stray radiation in the infrared opto-mechanical system, and the effect of laser incident power and angle on the stray radiation is investigated. The experimental results show that the ceramic coating can achieve 95.4% high absorption in the wavelength range of 0.2–16 μm, which can obviously suppress the stray radiation in the opto-mechanical system of infrared imaging caused by laser. The calculation of the stray radiation suppression ratio shows that, compared with the case without coating, the stray radiation intensity in the system can be reduced by 70% using the ceramic coating.

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Analysis and correction of stray thermal radiation in infrared optical systems including an experimental case study

Cited by 8 publications

References 14 publications

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

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

Analysis and inhibition of the stray light on space-based camera with wide field

Investigation of Stray Radiation Suppression in Infrared Imaging System Using a Novel Broadband and High-Absorption Ceramic Coating

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