Application of a PLL and ALL noise reduction for an optical sensing system

Olivier Jerome Dussarrat; D. Fraser Clark; T. J. Moir

doi:10.1117/12.250729

18 September 1996 Application of a PLL and ALL noise reduction for an optical sensing system

Olivier Jerome Dussarrat, D. Fraser Clark, T. J. Moir

Proceedings Volume 2782, Optical Inspection and Micromeasurements; (1996) https://doi.org/10.1117/12.250729
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

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.

Citation Download Citation

Olivier Jerome Dussarrat, D. Fraser Clark, and T. J. Moir "Application of a PLL and ALL noise reduction for an optical sensing system", Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); https://doi.org/10.1117/12.250729

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