title: Modulated pulses based distributed vibration sensing with high frequency response and spatial resolution.
abstract: A distributed optical fiber sensing system merged Mach-Zehnder interferometer and phase sensitive optical time domain reflectometer (φ-OTDR) system for vibration measurement with high-frequency response and high spatial resolution is demonstrated, where modulated pulses are proposed to be used as sensing source. Frequency response and location information are obtained by Mach-Zehnder interferometer and φ-OTDR technology, respectively. In order to simulate high-frequency vibration of crack of cable and civil structure, experiments on detection of piezoelectric transducer and pencil-break are carried out. Spatial resolution of 5 m and the maximum frequency response of ~3 MHz are achieved in 1064 m fiber link when the narrow pulse width is 50 ns.
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China. zhutao@cqu.edu.cn
authors.forename: Tao
authors.initials: T
authors.lastname: Zhu
authors.forename: Qian
authors.initials: Q
authors.lastname: He
authors.forename: Xianghui
authors.initials: X
authors.lastname: Xiao
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Bao
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D055100:Optical Fibers; D010783:Photometry / Q000295:instrumentation*; D014159:Transducers; D014732:Vibration