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Proceedings Paper

Uncooled multispectral detectors
Author(s): Volkmar Norkus; Gerald Gerlach; Guenter Hofmann
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Paper Abstract

The article describes the basic design and essential properties of developed multispectral detectors based on the pyroelectric material lithium tantalate (LiTaO3). The detector concepts presented here make parallel measurements possible in two to twelve spectral channels in the wavelength range of typically 1 - 25 micrometer. It is shown that these concepts are also useful for other responsive elements (thermopiles, PbS, PbSe). In one case, the detector consists of: (1) an optical unit with a beam splitter and interference filters for the spatial and spectral dispersion of the incident total radiation; and (2) the responsive elements with appropriate low-noise preamplifiers. The detector is a discrete and compact component in a TO 8 transistor casing (0 14 mm X 10 mm) with an aperture of typically 0 2 mm. Essential properties of a four-channel detector for gas analysis (CO; CO2; HC; REF) are described. The influence of the beam splitter geometry on the overlap of the measuring spots in the spectral channels is discussed. In the other case, the paper describes a hybrid arrangement of a six- channel multispectral detector which only uses interference filters for spatial and spectral dispersion of the input radiation. Its dimensions are about (22 X 22 X 33) mm3. It is shown that the radiation efficiency of this arrangement is higher than the first case.

Paper Details

Date Published: 26 October 1998
PDF: 8 pages
Proc. SPIE 3436, Infrared Technology and Applications XXIV, (26 October 1998); doi: 10.1117/12.328084
Show Author Affiliations
Volkmar Norkus, Dresden Univ. of Technology (Germany)
Gerald Gerlach, Dresden Univ. of Technology (Germany)
Guenter Hofmann, DIAS Angewandte Sensorik GmbH (Germany)

Published in SPIE Proceedings Vol. 3436:
Infrared Technology and Applications XXIV
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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