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9 May 2012 Optical time-domain reflectometer based multiplexed sensing scheme for environmental sensing
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In our study, remote environmental sensing is presented using a standard optical time domain reflectometer (OTDR). The measurement of environmental parameters using optical sensors is an expanding area of research with growing importance. Fiber optic sensors are an interesting solution for that due to their high sensitivity, small size, and capability for on-site, real-time, remote, and distributed sensing capabilities. Our multiplexing sensing scheme approach uses transmissive filters (long period gratings - LPGs) interrogated by the OTDR return pulses. The loss induced at the resonance wavelengths varies with changes in the environment refractive index, temperature or other physical parameters. Experimental results show that the insertion of an erbium amplifier improves the measurement resolution in certain situations. Further analysis show that a remote multiplexed sensing scheme allows us to perform simple and low cost real time measurement of refractive index and temperature over long distances.
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J. P. Carvalho, C. Gouveia, J. L. Santos, P. A. S. Jorge, and J. M. Baptista "Optical time-domain reflectometer based multiplexed sensing scheme for environmental sensing", Proc. SPIE 8439, Optical Sensing and Detection II, 84390B (9 May 2012);

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