Theoretical comparison of thermal contrast detected with thermal and quantum detector

Aranda, A.L.; Паез, Гонзало; Scholl, M. K.

doi:10.1016/j.infrared.2004.10.002

Cited by 6 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analysis presented here extends several previous works given in the past which have made use of a number of different approximation schemes. [8][9][10][11][12][13][14][15][16][17][18][19][20] The present work also impugns several results previously reported in the literature relating to the behaviour of the detected thermal contrast as a function of the wavelength band selected and type of detector considered.…”

Section: Introductionsupporting

confidence: 74%

“…4, as expected, since it can be readily shown that the second term consisting of polylogarithms in Eq. (20) tends to zero in such a limit. Thus the limiting value of four seen previously for the thermal contrast in a given wavelength interval for a blackbody is a horizontal asymptote approached from above by the curve T b e;0!T .…”

Section: Radiometric Casementioning

confidence: 92%

“…Thus, as the second term appearing in Eq. (20) consisting of polylogarithms is always positive, one has…”

Section: Radiometric Casementioning

confidence: 99%

See 2 more Smart Citations

Exact expressions for thermal contrast detected with thermal and quantum detectors

Stewart

Johnson

2014

SPIE Proceedings

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionsupporting

confidence: 74%

Section: Radiometric Casementioning

confidence: 92%

See 1 more Smart Citation

Exact expressions for thermal contrast detected with thermal and quantum detectors

Stewart

Johnson

2014

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…While not as frequently used as the corresponding radiometric case, initial study of the function dates back to the work of Zanstra in 1931 [4] and has a long history of being tabulated [10][11][12][13][14][15][16]. Other relatively simple examples in the infrared where the blackbody fractional function of the first kind for the actinometric case makes an appearance is in the calculation of the effective radiance for an infrared detector [17] or in the calculation of the detected thermal contrast [18] for a quantum detector [19][20][21][22].…”

Section: From Vu Jádè To Dèjá Vumentioning

confidence: 99%

A note on the general class of blackbody fractional functions

Stewart

2014

Infrared Physics & Technology

View full text Add to dashboard Cite

“…We recently studied the contribution to the changes in the radiative emission caused by emissivity and changes in temperature of the plants when subjected to stress conditions or even the onset of disease [3][4][5]. The attempt to separate the contribution of changes of emissivity from changes of temperature demands not only precise temperature determination but also the knowledge of the precision of temperature determination.…”

mentioning

confidence: 99%