Abstract
We theoretically and experimentally demonstrate a fiber-optic ultrasonic sensor system based on a fiber-ring laser whose cavity consisting of a regular fiber Bragg grating (FBG) and a tunable optical band-pass filter (TOBPF). The FBG is the sensing element and the TOBPF is used to set the lasing wavelength at a point on the spectral slope of the FBG. The ultrasonic signal is detected by the variations of the laser output intensity in response to the cold-cavity loss modulations from the ultrasonicallyinduced FBG spectral shift. The system demonstrated here has a simple structure and low cost, making it attractive for acoustic emission detection in structure health monitoring.
Original language | English (US) |
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Pages (from-to) | 29269-29276 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 21 |
Issue number | 24 |
DOIs | |
State | Published - Dec 2 2013 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics