Demodulator and method useful for multiplexed optical sensors

Details Demodulator and method useful for multiplexed optical sensors Demodulator and method useful for multiplexed optical sensors

1998-06-18

1999-05-11

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356350, 329346, G01B9/02

Patent

active

059033509

ABSTRACT:
An apparatus and method is presented to provide wide dynamic range measurements of the input phase to an interferometer using a phase generated carrier especially useful utilizing time multiplexing to demodulate a series of interferometers. A modulation drive output is provided by the invention and maintained under operation at the optimum amplitude by an internal feedback loop. The resulting highly stable system can be fabricated from an analog to digital converter, a digital signal processor, and a digital to analog converter making low cost open loop demodulators a reality.

REFERENCES:
patent: 5351123 (1994-09-01), Spahlinger

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