8 September 1998 Laser sensing application using an amplitude locked loop
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Abstract
In this paper, the demodulation characteristics of an amplitude locked loop (ALL) integrated into a laser sensing system are presented. The laser sensing system used here is a free space laser Doppler vibrometer which could be used for detecting the frequency of vibration of an object. The sensitivity of such a device is impaired by interference arising from spurious scattering along the propagation path. Mathematical and experimental investigations concluded that this interference pattern is identical to cochannel interference encountered in conventional radio-wave frequency modulation. By incorporating an ALL with a phase locked loop in the demodulator of the optical system, a dramatic improvement over 10 dB Sinad (measurement done with no psophometer) was found over existing technology.
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Olivier Jerome Dussarrat, Olivier Jerome Dussarrat, D. Fraser Clark, D. Fraser Clark, T. J. Moir, T. J. Moir, } "Laser sensing application using an amplitude locked loop", Proc. SPIE 3380, Laser Radar Technology and Applications III, (8 September 1998); doi: 10.1117/12.327207; https://doi.org/10.1117/12.327207
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