Microwave photonics filtering technique for interrogating long weak fiber Bragg grating sensors

A system to interrogate photonic sensors based on long weak fiber Bragg gratings (FBGs) is presented and experimentally demonstrated, dedicated to measure the precise location of several spot events. The principle of operation is based on a technique used to analyze microwave photonics (MWP) filters. The long weak FBGs are used as quasi-distributed sensors. Several events can be detected along the FBG device with a spatial accuracy under 1 mm using a modulator and a photo-detector (PD) with a modest bandwidth of less than 500 MHz. The simple proposed scheme is intrinsically robust against environmental changes and easy to reconfigure.


Published in:
Proc. SPIE, 9157, 9157AO
Presented at:
23rd International Conference on Optical Fibre Sensors, Santander, Spain, June 2-6, 2014
Year:
2014
Publisher:
SPIE
Keywords:
Laboratories:




 Record created 2014-07-14, last modified 2018-03-17

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