Measurement of internal stray radiation of a thermal infrared spectrometer based on temperature variation

Peng, Jun; Yue, Xu; Du, Haoting; Yin, Zihao; Mengyang, Chai; Sun, Dexin; Liu, Yinnian

doi:10.1364/ao.58.008457

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Due to their thermal conductivity, the temperature of the components becomes uniform. In this paper, all components except for the detector are assumed to be at an ambient temperature [ 19 , 20 ]. Figure 3 shows a schematic diagram of the stray radiation transmission of the imaging system.…”

Section: Detector Response Of the Infrared Radiation Measurement Systemmentioning

confidence: 99%

Equivalent Calibration Method Based on a Blackbody Baffle Substitution for a Large External Surface-Source Blackbody

Pang

et al. 2022

Sensors

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Highly accurate measurements of infrared systems cannot be achieved without precise radiometric calibrations. In order to correctly interpret and process infrared images and monitor the performance of infrared cameras, their radiometric calibration is also required periodically. In this paper, an equivalent calibration method is proposed based on an internal blackbody baffle. It is used for the replacement of a large surface-source blackbody covering the aperture for the field calibration of large-aperture equipment. Subsequently, the expressions of the equivalent calibration conversion function (ECCF) are derived based on the grayscale response of the camera and the calibration models of the two methods, and experimental measurements and fits are performed using a cooled mid-wave infrared camera. The results show that the measured functional form is consistent with the physical meaning. Moreover, in the target imaging experiments, the results of the inversion using the equivalent calibration conversion function and the results of the direct calibration of the external blackbody are largely consistent with the average error of 0.198% between the two, and the maximum error is within 1%. The maximum error between the inversion result of radiation brightness and the actual value of the target is 6.29%, and the accuracy fully meets the radiometric measurement requirements.

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Section: Detector Response Of the Infrared Radiation Measurement Systemmentioning

confidence: 99%

Equivalent Calibration Method Based on a Blackbody Baffle Substitution for a Large External Surface-Source Blackbody

Pang

et al. 2022

Sensors

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“…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%

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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“…Near-infrared (NIR) photodetectors have extensive research value, which possess a wide range of applications in military and civil fields such as communication, [44,45] passive night vision, [46] biosensors, [47,48] NIR imaging, and radiation measurements. [49,50] Compared to the UV-vis responsive photodetectors, NIR photodetectors possess the advantages of minimized transmission energy loss for optical fiber communication, night visibility for overnight working, and biocompatibility for biometric systems and disease diagnoses, etc. [44,46,47] In this regard, breaking the absorption limit of perovskite materials and developing efficient perovskite-based NIR photodetectors are highly attractive across material, chemical, and physical research communities.…”

mentioning

confidence: 99%

Laser‐Assisted Synthesis of Ag₂S‐Quantum‐Dot‐in‐Perovskite Matrix and Its Application in Broadband Photodetectors

Zhao

Chen

Wei

et al. 2021

Advanced Optical Materials

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properties, [5][6][7][8][9][10][11][12] including large absorption coefficient (≈10 5 cm −1 ), low trap density, large carrier diffusion length (from 2.6 µm to 3 mm), high carrier mobility (≈100 cm 2 V −1 s −1 ), and small exciton binding energy (≈20 meV), enable a range of promising applications in optoelectronics and electronics, such as solar cells, [13][14][15][16] transistors, [17][18][19][20] lasers, [21][22][23][24] and light emitting diodes (LEDs). [25][26][27][28] Although great progress has been made for perovskite optoelectronics in the last decade, a deep understanding and control their underlying properties remain limited. For example, the absorption wavelength of common-used perovskites is limited to the UV-vis range. Developing an effective and facile strategy to tune its optical and electronic properties remains as a major challenge.Introducing ions, molecules, or nanoparticles into perovskites provides more possibilities to tune their optical, electrical, and even mechanical properties. For example, He et al. introduced Cs ions into perovskite, resulting in improved photoelectric conversion efficiency and increased stability. [29] Lin et al. synthesized perovskite/carbon nanotube composite crystal and achieved improved carrier mobilities. [30] Coupling perovskites with quantum dots (QDs) provides more interesting phenomena. For example, Sargent's group first developed a mixed perovskite film by introducing PbS QDs into cystalline film and a single crystal bulk, which showed promising light-emitting application in IR region. [31,32] Halide perovskites are widely explored as efficient photoresponsive materials for optoelectronic devices. However, understanding and controlling their underlying optical and electrical properties remains limited. Here, a novel approach is developed by introducing silver sulfide (Ag 2 S) quantum dots (QDs) into an MAPbBr 3 single crystal. The high-quality Ag 2 S-quantum-dot-inperovskite (Ag 2 S-QDiP) matrixes synthesized through a laser-assisted inverse temperature crystallization (LA-ITC) strategy show broadband light-sensitive wavelength from 550 to over 1000 nm, and a balanced carriers mobility facilitates their transmission and collection. A Ag 2 S-QDiP-enabled photodetector is demonstrated, which exhibits considerably enhanced responsivity and detectivity of 1.17 A W −1 and 6.24 × 10 14 Jones at 532 nm, and 57.69 mA W −1 and 1.03 × 10 11 Jones at 1064 nm, respectively. The enhanced performance in the near-infrared (NIR) region can be attributed to the discrete heterojunction formed between MAPbBr 3 and Ag 2 S QDs, which enhances the light absorption in the NIR range and facilitates photogenerated excitons' separation at the interface. The facile synthesis process, the more balanced transport behavior, and the ensuing improved device performance highlight introducing QDs into perovskite single crystal as an efficient strategy for tuning fundamental properties of perovskite and for developing high-efficiency broadband electronic and optoelectronic devices.

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Measurement of internal stray radiation of a thermal infrared spectrometer based on temperature variation

Cited by 6 publications

References 16 publications

Equivalent Calibration Method Based on a Blackbody Baffle Substitution for a Large External Surface-Source Blackbody

Equivalent Calibration Method Based on a Blackbody Baffle Substitution for a Large External Surface-Source Blackbody

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

Laser‐Assisted Synthesis of Ag₂S‐Quantum‐Dot‐in‐Perovskite Matrix and Its Application in Broadband Photodetectors

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Measurement of internal stray radiation of a thermal infrared spectrometer based on temperature variation

Cited by 6 publications

References 16 publications

Equivalent Calibration Method Based on a Blackbody Baffle Substitution for a Large External Surface-Source Blackbody

Equivalent Calibration Method Based on a Blackbody Baffle Substitution for a Large External Surface-Source Blackbody

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

Laser‐Assisted Synthesis of Ag2S‐Quantum‐Dot‐in‐Perovskite Matrix and Its Application in Broadband Photodetectors

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Laser‐Assisted Synthesis of Ag₂S‐Quantum‐Dot‐in‐Perovskite Matrix and Its Application in Broadband Photodetectors