Thermal Design of Blackbody for On-Board Calibration of Spaceborne Infrared Imaging Sensor

Kim, Hyein; Chae, Bong-Geon; Choi, Pil-Gyeong; Jo, Mun-Shin; Lee, Kyoung-Muk; Oh, Hyun-Ung

doi:10.3390/aerospace9050268

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…Onboard calibration units have been developed for both balloon-and space-based systems. 20,21 Phase change materials and passive heat pipes provide a low-cost and energy-efficient method of producing a stable BB target. Such materials are not conducive to use as a BB target with adjustable temperature.…”

Section: In Situ Calibration Instrumentation and Techniquesmentioning

confidence: 99%

Developing a robust thermal polarized calibration source

Parkinson,

Kupinski

2024

Polarization: Measurement, Analysis, and Remote Sensing XVI

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Performance fluctuations of LWIR radiometers necessitate frequent calibration which is further complicated for LWIR polarimeters. Existing compact LWIR polarization calibration methods have inherent limitations; notably, combining an unpolarized source with a wire-grid polarizer can lead to polarized reflections which depend upon the thermal environment. Furthermore, microbolometers, which have risen in popularity due to their low size, weight, and power (SWaP) and cost, have intrinsic diattenuation. This research reviews several approaches to generating a linearly polarized signal in the thermal IR waveband for use as a polarimetric calibration target. The impact of environmental reflections from wire-grid polarizers and the intrinsic polarimetric response of a low-cost uncooled microbolometer is first demonstrated. A wire-grid polarizer is place in direct contact with a heating element to analyze the emission behavior of the wire-grid polarizer. Thin wires are also known to exhibit polarized thermal emission. This phenomena is observed through application of an electrical current through nanoscale wires of a wire-grid polarizer as well as through 20[µm] diameter tungsten wires suspended in free-space. The goal of these investigations is a low SWaP polarimetric calibration source for thermal LWIR polarimeters that is robust to the environmental fluctuations.

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Section: In Situ Calibration Instrumentation and Techniquesmentioning

confidence: 99%

Developing a robust thermal polarized calibration source

Parkinson,

Kupinski

2024

Polarization: Measurement, Analysis, and Remote Sensing XVI

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“…Established protocols for calibration of non-contact temperature measuring instruments, and consequently also most scientific publications in this field, mostly refer to calibrations of radiation thermometers which measure temperature of the black body. Such a calibration protocol is described by Murthy, Tsai and Saunders [1], König et al [2], Donlon et al [3], Boles [4], Kim et al [5] and Miklavec et al [6].…”

Section: Radiation Thermometry Of Black Bodiesmentioning

confidence: 99%

Traceable Spectral Radiation Model of Radiation Thermometry

Mlačnik¹,

Pušnik²

2023

Preprint

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Despite great technical capabilities, the theory of non-contact temperature measurement is usually not fully applicable to the use of measuring instruments in practice. While black body calibrations are in practice well established and easy to accomplish, this calibration protocol is never fully applicable to measurements of real objects under real conditions. Currently, the best approximation to real world radiation thermometry is grey body radiation thermometry, which is supported by most measuring instruments to date. Nevertheless, the metrological requirements necessitate traceability, therefore real body radiation thermometry is required for temperature measurements of real bodies. This article documents the current state of temperature calculation algorithms for radiation-thermometers and the creation of a traceable model for radiation thermometry of real bodies that uses a digital twin model of the system of measurement to compensate for the loss of data, caused by spectral integration, which occurs when thermal radiation is absorbed on the active surface of the sensor. To solve this problem, a hybrid model with variable scalar inputs is proposed, in which the scalar input parameters are calculated to correspond to the system of measurement. The method for calculating the effective parameters is proposed and verified with the theoretical model of non-contact thermometry. The sum of effective instrumental parameters is presented for different temperatures to show that the rule of radiation thermometry of grey bodies, according to which the sum of instrumental emissivity and instrumental reflectivity equals to 1, does not hold in radiation thermometry for real bodies. Using the derived models of radiation thermometry, the uncertainty of radiation thermometry due to the uncertainty of spectral emissivity is analysed by simulated measurements along the temperature ranges of various radiation thermometers, enabling traceable non-contact temperature measurements with known measurement uncertainty under any known conditions.

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“…Established protocols for calibration of non-contact temperature measuring instruments, and consequently most scientific publications in this field, mostly refer to calibrations of radiation thermometers using black bodies. Such calibration protocols are described in [12][13][14][15][16][17][18][19]. BBRT is considered traceable and is therefore used by calibration laboratories to transfer radiation references.…”

Section: Black Body Radiation Thermometry (Bbrt)mentioning

confidence: 99%

“…which is a scalar number, rather than spectral radiance, which is defined as a spectrally distributed radiant power. The scalar inverse model can be obtained from the scalar direct model (16); that is, the direct model ( 14) with scalar influence parameters (ε λ ε, 𝜏 λ 𝜏, etc.). This scalar replacement can only be correctly implemented in the direct model under simplification of constant (spectrally independent) influence parameters.…”

Section: Scalar Inverse Modelmentioning

confidence: 99%

A Traceable Spectral Radiation Model of Radiation Thermometry

Mlačnik

Pušnik

2023

Applied Sciences

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Despite great technical capabilities, the theory of non-contact temperature measurement is usually not fully applicable to the use of measuring instruments in practice. While black body calibrations and black body radiation thermometry (BBRT) are in practice well established and easy to accomplish, this calibration protocol is never fully applicable to measurements of real objects under real conditions. Currently, the best approximation to real-world radiation thermometry is grey body radiation thermometry (GBRT), which is supported by most measuring instruments to date. Nevertheless, the metrological requirements necessitate traceability; therefore, real body radiation thermometry (RBRT) method is required for temperature measurements of real bodies. This article documents the current state of temperature calculation algorithms for radiation thermometers and the creation of a traceable model for radiation thermometry of real bodies that uses an inverse model of the system of measurement to compensate for the loss of data caused by spectral integration, which occurs when thermal radiation is absorbed on the active surface of the sensor. To solve this problem, a hybrid model is proposed in which the spectral input parameters are converted to scalar inputs of a traditional scalar inverse model for GBRT. The method for calculating effective parameters, which corresponds to a system of measurement, is proposed and verified with the theoretical simulation model of non-contact thermometry. The sum of effective instrumental parameters is presented for different temperatures to show that the rule of GBRT, according to which the sum of instrumental emissivity and instrumental reflectivity is equal to 1, does not apply to RBRT. Using the derived models of radiation thermometry, the uncertainty of radiation thermometry due to the uncertainty of spectral emissivity was analysed by simulated worst-case measurements through temperature ranges of various radiation thermometers. This newly developed model for RBRT with known uncertainty of measurement enables traceable measurements using radiation thermometry under any conditions.

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Thermal Design of Blackbody for On-Board Calibration of Spaceborne Infrared Imaging Sensor

Cited by 5 publications

References 20 publications

Developing a robust thermal polarized calibration source

Developing a robust thermal polarized calibration source

Traceable Spectral Radiation Model of Radiation Thermometry

A Traceable Spectral Radiation Model of Radiation Thermometry

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