Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-11-10
1999-07-13
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 359183, 375326, H01J 516
Patent
active
059230304
ABSTRACT:
A digital receiver system is used to recover a signal of interest, such as measurand signal, from a phase modulated signal detected from a system utilizing quadrature carriers, such as a fiber optic interferometer sensor system. The digital receiver system includes a quadrature sampling demodulator that samples the phase modulated signal by using quadrature sampling periods to recover the odd and even components of the signal of interest. The digital receiver system can be used with an interferometer sensor system having an array of sensors that multiplex the measurand signals, e.g., using time or wavelength division multiplexing. Sampling with quadrature time samples provides a spacing in time between the samples that allows additional sensors to be multiplexed.
REFERENCES:
patent: 5117440 (1992-05-01), Smith et al.
Assard Gerald L.
Blakely Barry A.
Deus III Antonio L.
Lall Prithvi C.
Le Que T.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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