Active Q-point stabilization for linear interferometric sensors

Details Active Q-point stabilization for linear interferometric sensors Active Q-point stabilization for linear interferometric sensors

2006-03-21

2006-03-21

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S450000, C356S519000

Reexamination Certificate

active

07016047

ABSTRACT:
A linear interferometric sensor system in which the light output from the interferometric sensor is optically bandpass filtered before conversion to an electrical signal by an adjustable band-pass filtering device and the center wavelength of the adjustable band-pass filtering device is controlled by a feedback circuit responsive to the steady state component of the electrical signal corresponding to the filtered sensor return. In a preferred embodiment, the adjustable band-pass filtering device is an electrically tunable optical filter. The invention is particularly useful in self calibrating interferometric/intensity-based sensor configuration, but can be used with other linear interferometric sensor configurations.

REFERENCES:
patent: 4853534 (1989-08-01), Dakin
patent: 4873989 (1989-10-01), Einzig
patent: 5301001 (1994-04-01), Murphy et al.
Yu, et al., “Fiber Fabry-Perot Sensors for Detection of Partial Discharges In Power Transformers”, Applied Optics, vol. 42, No. 16, Jun. 2003.

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