Experimental results of the application of PLL and ALL noise reduction for an optical sensing system

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

doi:10.1117/12.281181

17 September 1997 Experimental results of the application of PLL and ALL noise reduction for an optical sensing system

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

Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281181
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

Recently a new system has been proposed for the removal of cochannel or multipath interference found in an optical heterodyne sensing system. It involves an amplitude locked loop used in conjunction with a phase locked loop in the system demodulator. Such a detector has been incorporated into a free-space Doppler vibrometer detection system. This paper presents experimental results and details of the performance of such a system suffering from interferences arising from spurious scattered light with and without the new detection circuitry. The result presented indicate a dramatic improvement over conventional demodulation systems.

Citation Download Citation

Olivier Jerome Dussarrat, D. Fraser Clark, and T. J. Moir "Experimental results of the application of PLL and ALL noise reduction for an optical sensing system", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); https://doi.org/10.1117/12.281181

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