Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection

Ming Han, Tongqing Liu, Lingling Hu, Qi Zhang

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


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 languageEnglish (US)
Pages (from-to)29269-29276
Number of pages8
JournalOptics Express
Issue number24
StatePublished - Dec 2 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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