Fixed-pattern-noise cancellation in linear pyro arrays

Subhash C. Jain; H. S. Malhotra; K. N. Sarebahi; K. S. Bist

doi:10.1117/12.45821

1 September 1991 Fixed-pattern-noise cancellation in linear pyro arrays

Subhash C. Jain, H. S. Malhotra, K. N. Sarebahi, K. S. Bist

Proceedings Volume 1488, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II; (1991) https://doi.org/10.1117/12.45821
Event: Orlando '91, 1991, Orlando, FL, United States

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.

Citation Download Citation

Subhash C. Jain, H. S. Malhotra, K. N. Sarebahi, and K. S. Bist "Fixed-pattern-noise cancellation in linear pyro arrays", Proc. SPIE 1488, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II, (1 September 1991); https://doi.org/10.1117/12.45821

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