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Proceedings Paper

Thermal emitter array: prediction of apparent blackbody temperature and thermal nonuniformity remedies
Author(s): James Lynn Smith
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Paper Abstract

Theory and data were used to characterize apparent blackbody temperature spatial variation for a thermal emitter array and determine its dependence on sensor wavelength. The effect of inactive resistor cells was also explored. Two kinds of spatial variations are (1) nonuniformities between the operating characteristics of different thermal array cells and (2) periodic variation due to spatially varying temperature within each cell. Essential developments were (a) curves for determining how thermal effects measured in one sensor band translate to that for another spectral band, (b) analysis of measured data in a one-temperature model and a two-temperature model, and (c) quantification of a defocus remedy for decreasing contrast between inactive and active cells. It is concluded that (A) apparent blackbody temperature and spatial variations thereof are lower for high wavelengths than at 2 microns, (B) use of a uniform, one-temperature blackbody model leads to the consequence of an exaggerated effective emissivity decrease at higher wavelengths, and (C) defocus circle diameter of 1.75 times the array cell spacing promotes optimum operation. This work was performed in Eglin's Guided Weapons Evaluation Facility (GWEF).

Paper Details

Date Published: 13 July 1998
PDF: 10 pages
Proc. SPIE 3368, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing III, (13 July 1998); doi: 10.1117/12.316360
Show Author Affiliations
James Lynn Smith, Tracor Services Corp./Guided Weapons Evaluation Facility (United States)


Published in SPIE Proceedings Vol. 3368:
Technologies for Synthetic Environments: Hardware-in-the-Loop Testing III
Robert Lee Murrer Jr., Editor(s)

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