title: Monitoring the propagation of mechanical waves using an optical fiber distributed and dynamic strain sensor based on BOTDA.
abstract: We report a Brillouin-based fully distributed and dynamic monitoring of the strain induced by a propagating mechanical wave along a 20 m long composite strip, to which surface a single-mode optical fiber was glued. Employing a simplified version of the Slope-Assisted Brillouin Optical Time Domain Analysis (SA-BOTDA) technique, the whole length of the strip was interrogated every 10 ms (strip sampling rate of 100 Hz) with a spatial resolution of the order of 1m. A dynamic spatially and temporally continuous map of the strain was obtained, whose temporal behavior at four discrete locations was verified against co-located fiber Bragg gratings. With a trade-off among sampling rate, range and signal to noise ratio, kHz sampling rates and hundreds of meters of range can be obtained with resolution down to a few centimeters.
authors.affiliation: The Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel.
authors.forename: Yair
authors.initials: Y
authors.lastname: Peled
authors.forename: Avi
authors.initials: A
authors.lastname: Motil
authors.forename: Iddo
authors.initials: I
authors.lastname: Kressel
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
mesh_terms: D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D014159:Transducers