Signal extraction apparatus and method

Details Signal extraction apparatus and method Signal extraction apparatus and method

1989-12-29

1992-05-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022727, H01J 516

Patent

active

051151286

ABSTRACT:
A resonant beam sensor is excited into resonance by directing onto it a drive signal comprising light which has been amplitude modulated at the resonant frequency. A portion of the drive signal reflected by the sensor is demodulated by a photodetector to provide a measurement signal.

REFERENCES:
patent: 4451730 (1984-05-01), Brogardh et al.
patent: 4562348 (1985-12-01), Brogardh et al.
patent: 4772786 (1988-09-01), Langdon
patent: 4933545 (1990-06-01), Saaski et al.

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