A submerged optical fiber ultrasonic sensor using matched fiber bragg gratings

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Abstract

A novel kind of fiber optic ultrasonic sensor based on matching fiber Bragg gratings (FBGs) is proposed and demonstrated. The sensors consist of a pair of matching FBGs fixed to a special bracket. The bracket plays a role in stretching and squeezing the FBGs, with the push–pull effect efficiently coupling the ultrasonic signal to the sensor, thus, improving the sensor’s sensitivity. Side-band filtering technology-based intensity interrogation was used to detect ultrasounds in water. With the synergic effect of the matching FBGs, the sensor performed with a high signal-to-noise ratio (56.9 dB at 300 KHz, 53 dB at 1 MHz and 31.8 dB at 5 MHz) and the observed ultrasonic sinusoidal signals were undistorted and distinguishable in the time domain.

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APA

Bai, X., Hu, M., Gang, T., & Rong, Q. (2018). A submerged optical fiber ultrasonic sensor using matched fiber bragg gratings. Sensors (Switzerland), 18(6). https://doi.org/10.3390/s18061942

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