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Proceedings Paper

Application of a Si composite bolometer in an IR spectrophotometer
Author(s): Janos P. Makai; Robert D. Saunders; Gyula Dezsi
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Paper Abstract

A Si composite bolometer is used in the wavelength range of 2 - 25 micrometers as the detector of an IR spectrophotometer system. The bolometer operates at 4.2 K. The dewar incorporates a nonimaging concentrator in front of the detector and different bandpass and highpass spectral filters to improve the signal-to-noise ratio. The linearity, a highly critical issue in spectrophotometry, was tested by a modified ac/dc method where chopped radiation is superimposed on continuous radiation. The intensities of both beams are varied. The ac/dc signals of the detector are measured by a lock-in amplifier and digital voltmeter, respectively. This technique closely matches the conditions of a real application, since dc background radiation is unavoidable in any system. bolometer linearity results, frequency response, and correction methods are presented.

Paper Details

Date Published: 17 October 1994
PDF: 8 pages
Proc. SPIE 2269, Infrared Technology XX, (17 October 1994);
Show Author Affiliations
Janos P. Makai, Research Institute for Technical Physics (Hungary)
Robert D. Saunders, National Institute of Standards and Technology (United States)
Gyula Dezsi, National Office of Measures (Hungary)

Published in SPIE Proceedings Vol. 2269:
Infrared Technology XX
Bjorn F. Andresen, Editor(s)

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