Thermal contrast detected with a thermal detector

Паез, Гонзало; Scholl, Marija S.

doi:10.1016/s1350-4495(98)00050-4

Cited by 20 publications

(13 citation statements)

References 5 publications

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“…We proposed to call this quantity the detected thermal contrast. This is to differentiate it from the contrast, the term that generally does not consider the detection process, and the thermal contrast, the expression that denotes the change in incidance of a blackbody source arising from the temperature change [3,4].…”

Section: Detected As Opposed To Emitted (Or Incident) Contrast For Irmentioning

confidence: 99%

Theoretical comparison of thermal contrast detected with thermal and quantum detector

Aranda

Паез

Scholl

2005

Infrared Physics & Technology

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Section: Detected As Opposed To Emitted (Or Incident) Contrast For Irmentioning

confidence: 99%

Theoretical comparison of thermal contrast detected with thermal and quantum detector

Aranda

Паез

Scholl

2005

Infrared Physics & Technology

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“…In line with what has been shown before, the detected thermal contrast for either detector type consists of two terms. [8][9][10] The first is an emissivity dependent term brought about by changes in the temperature at the surface of the target while the second is a purely radiative term related to the thermal contrast for the corresponding blackbody. Greatly simplified expressions for the detected thermal contrast in the grey body approximation are also given.…”

Section: Introductionmentioning

confidence: 99%

Exact expressions for thermal contrast detected with thermal and quantum detectors

Stewart

Johnson

2014

SPIE Proceedings

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The detected thermal contrast is a recently defined figure of merit introduced to describe the overall performance of a detector detecting radiation from a thermal source. We examine the detected thermal contrast for the case where the target emissivity can be assumed to be a function of the temperature and independent of the wavelength within a narrow wavelength interval of interest. Exact expressions are developed to evaluate the thermal contrast detected by both thermal and quantum detectors for focal-plane radiation detecting instruments. Expressions for the thermal contrast of a blackbody, an intrinsic radiative quantity of a body independent of the detection process, and simplified expressions for the detected thermal contrast for target emissivities which are well approximated by the grey body approximation are also given. It is found the contribution in the detected thermal contrast consists of two terms. The first results from changes occurring in the emissivity of a target with temperature while the second results from purely radiative processes. The size of the detected thermal contrast is found to be similar for the two detector types within typical infrared wavelength intervals of interest, contradicting a result previously reported in the literature. The exact results are presented in terms of a polylogarithmic formulation of the problem and extend a number of approximation schemes that have been proposed and developed in the past.

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“…[1][2][3][4] In both cases, the temperature dependence of emissivity is a contributing factor. Thus, the derivative of the detected incidance in a wavelength interval with respect to temperature includes two terms: the first one is associated with the change in blackbody emission and the second one with the change of emissivity with temperature.…”

Section: Change Of Detected Non-blackbody Incidance With Temperaturementioning

confidence: 99%

Tungsten lamp as radiation standard and the emissivity effects

Strojnik¹,

Паез²

2004

Proceedings of the 2004 International Conference on Quantitative InfraRed Thermography

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The derivative of the detected incidance in a wavelength interval with respect to temperature includes two terms. The first term depends on the change in blackbody emission and the second one on the change of emissivity with temperature. The error of neglecting the second term is analyzed and evaluated for a standard radiation source, a tungsten lamp. In this case, the error changes form a negligible amount of 6% to a significant value of more than 45%.

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Thermal contrast detected with a thermal detector

Cited by 20 publications

References 5 publications

Theoretical comparison of thermal contrast detected with thermal and quantum detector

Theoretical comparison of thermal contrast detected with thermal and quantum detector

Exact expressions for thermal contrast detected with thermal and quantum detectors

Tungsten lamp as radiation standard and the emissivity effects

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