Optical interferometric sensor detected intensity noise reductio

Details Optical interferometric sensor detected intensity noise reductio Optical interferometric sensor detected intensity noise reductio

1990-02-05

1992-04-14

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

25022727, G01B 902

Patent

active

051042231

ABSTRACT:
An apparatus for reducing the detected optical intensity noise received f an optical interferometric sensor. One embodiment of the device comprises high pass and low pass filtering means and an arithmetic divider device, arranged so as to receive a single signal S.sub.1 and to cancel unwanted intensity noise in signal S.sub.1 prior to the transmittal of the noise free signal S.sub.out to a receiver circuit. A second embodiment of the device further includes an adder and a subtractor to receive two signals S.sub.1 and S.sub.2. The adder and subtractor are cross connected in such a way as to combine the two signals for further processing and also to still permit intensity noise cancellation in the event one of the signals is not available.

REFERENCES:
patent: 3830568 (1974-08-01), Allen
patent: 4868381 (1989-09-01), Davis

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