In this paper we present a fiber optic sensor that demonstrates higher sensitivity than the typical fiber Bragg grating sensor, and it is capable of monitoring the state of its own health. The sensor design uses an induced phase discontinuity in the fiber Bragg grating to create a narrow pass-band within the reflection spectrum of the grating. The position of this narrow window within the Bragg spectrum is used to monitor the sensor's health.
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Jerry Angelichio, "A highly sensitive smart fiber sensor," Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 41850P (9 November 2000);