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Application of a PLL and ALL noise reduction process in optical sensing systems

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2 Author(s)
Clark, D.F. ; Dept. of Electr. & Electron. Eng., Paisley Univ., UK ; Moir, T.J.

A novel approach to the demodulation of a frequency modulated optical signal using an amplitude-locked loop (ALL) in the presence of noise is presented. The ALL is the mathematical dual of the phase-locked loop (PLL), but works on amplitude rather than phase. This technique will benefit areas where noise due to scattering or multiple reflections is present

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Industrial Electronics, IEEE Transactions on  (Volume:44 ,  Issue: 1 )