Patent ID: 6370289
Filing Date: 2002-04-09
Classification: G01C

Abstract:
A fiber-optic sensor system for producing a fiber-optic sensor signal having reduced noise, comprising:a fiber-optic sensor adapted to receive a sensor input light and adapted to measure a physical quantity, with the fiber-optic sensor producing a sensor output signal corresponding to the physical quantity and a first noise component; a first detector which detects the sensor output signal; a second detector which detects the sensor input light corresponding to a second noise component; and an electronic processor coupled to the first and second detector, wherein the electronic processor includes a delay circuit which applies an electronic time delay to the second noise component, with the electronic time delay substantially corresponding to a time delay of the sensor input light traversing the fiber-optic sensor, a multiplier, which multiplies the time-delayed second noise component with the sensor output signal, and a subtractor which subtracts the multiplied time-delayed second noise component from the sensor output signal to produce the fiber-optic sensor signal having the reduced noise.