Optical fiber ultrasonic sensor networks based on WDM and TDM

An optical fiber sensor network for ultrasonic measurement based on wavelength division multiplexing (WDM) and time division multiplexing (TDM) technology is presented. Each of the sensor probes is an optical fiber extrinsic Fabry-Perot interferometer (EFPI) which is composed of the fiber's end...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 276; no. 1; pp. 012125 - 6
Main Authors Guo, Zhenwu, Li, Weixiang, Liu, Tiegen
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.02.2011
Subjects
Aluminum
Broadband
Computer networks
Extrinsic Fabry-Perot interferometers
Fiber optics
Frequency response
Light sources
Multiplexers
Multiplexing
Narrowband
Optical fibers
Optical filters
Optical switching
Physics
Scanning
Sensors
Switching theory
Time division multiplexing
Ultrasonic methods
Wave division multiplexing
Wavelength division multiplexing
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Summary:An optical fiber sensor network for ultrasonic measurement based on wavelength division multiplexing (WDM) and time division multiplexing (TDM) technology is presented. Each of the sensor probes is an optical fiber extrinsic Fabry-Perot interferometer (EFPI) which is composed of the fiber's end face and the aluminum thin diaphragm. The sensors are arranged in different wavelength domains formed by a wavelength division multiplexer. Each wavelength division multiplexer, with a group of the sensors, is connected to one of the output ports of optical switch to realize TDM. The signal of each sensor is exported sequentially from a tunable narrowband optical filter (TNOF) that queries every sensor though scanning mode. The principle of the phenomenon of phase induced signal fade in interferometric fiber-optic sensors is also analyzed. Nicely, the detection method above implements the operation of anti-phase induced signal fade detection. The system is interrogated by broadband light source. The scanning range of TNOF is full of the bandwidth of the light source. The result of experiment in water show that the sensor sensitivity reaches −162dB(0dB=1rad/μPa), the frequency response range is from 10KHz to 5 MHz. The number of multiplexing sensors based on WDM and TDM reaches to 64.
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ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/276/1/012125