Application of a Si composite bolometer in an IR spectrophotometer

Janos P. Makai; Robert D. Saunders; Gyula Dezsi

doi:10.1117/12.188694

17 October 1994 Application of a Si composite bolometer in an IR spectrophotometer

Janos P. Makai, Robert D. Saunders, Gyula Dezsi

Proceedings Volume 2269, Infrared Technology XX; (1994) https://doi.org/10.1117/12.188694
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

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Janos P. Makai, Robert D. Saunders, and Gyula Dezsi "Application of a Si composite bolometer in an IR spectrophotometer", Proc. SPIE 2269, Infrared Technology XX, (17 October 1994); https://doi.org/10.1117/12.188694

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