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Proceedings Paper

Fixed-pattern-noise cancellation in linear pyro arrays
Author(s): Subhash C. Jain; H. S. Malhotra; K. N. Sarebahi; K. S. Bist
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Paper Abstract

The signals from the alternative scans of a chopped cw radiation are of opposite polarities. The output of each scan from a linear array of detectors is digitized and stored in a memory. The output from the successive scans are delayed and added in phase. An inverter switch operating in synchronism with chopper inverts outputs of alternate scans and provides a sequence of signals of the same polarity. The signals of opposite polarities from alternate scans are thus also added in phase and doubled. The fixed pattern noise of opposite polarity from the alternate scans are cancelled. A reduction of more than 20 dB in the fixed pattern noise has been obtained.

Paper Details

Date Published: 1 September 1991
PDF: 4 pages
Proc. SPIE 1488, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II, (1 September 1991); doi: 10.1117/12.45821
Show Author Affiliations
Subhash C. Jain, Defence Electronics Applications Lab. (India)
H. S. Malhotra, Defence Electronics Applications Lab. (India)
K. N. Sarebahi, Defence Electronics Applications Lab. (India)
K. S. Bist, Defence Electronics Applications Lab. (India)


Published in SPIE Proceedings Vol. 1488:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II
Gerald C. Holst, Editor(s)

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