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Proceedings Paper

Application of a PLL and ALL noise reduction for an optical sensing system
Author(s): Olivier Jerome Dussarrat; D. Fraser Clark; T. J. Moir
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Paper Abstract

A novel application of the incorporation of an amplitude- locked loop (ALL) into a coherent optical sensing system is presented. The ALL is the mathematical dual of the phase- locked loop and is a unique circuit which operates on amplitude rather than phase. Current work on the ALL has concentrated on developing a simple free space Doppler velocimetry system whereby an object's velocity may be identified by analyzing the frequency content of coherent light reflected from the object. It is the purpose of this paper to highlight the potential advantages of using an ALL in the detection circuitry of a coherent optical sensing system in order to improve the detection sensitivity of such a system.

Paper Details

Date Published: 18 September 1996
PDF: 9 pages
Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); doi: 10.1117/12.250729
Show Author Affiliations
Olivier Jerome Dussarrat, Univ. of Paisley (United Kingdom)
D. Fraser Clark, Univ. of Paisley (United Kingdom)
T. J. Moir, Univ. of Paisley (United Kingdom)


Published in SPIE Proceedings Vol. 2782:
Optical Inspection and Micromeasurements
Christophe Gorecki, Editor(s)

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