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Sensors 2012, 12(5), 5888-5895; doi:10.3390/s120505888
Article

A Wide Dynamics and Fast Scan Interrogating Method for a Fiber Bragg Grating Sensor Network Implemented Using Code Division Multiple Access

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*
Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
* Author to whom correspondence should be addressed.
Received: 5 April 2012 / Revised: 3 May 2012 / Accepted: 3 May 2012 / Published: 8 May 2012
(This article belongs to the Special Issue Optical Fiber Sensors 2012)
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Abstract

We propose and demonstrate a fiber Bragg grating (FBG) sensor network employing the code division multiple access (CDMA) technique to identify information from individual sensors. To detect information without considering time delays between sensors, a sliding correlation method is applied, in which two different signals with the same pseudo-random binary sequence (PRBS) pattern, but slightly different frequencies, are applied to the source and detector sides. Moreover, for time domain detection, a wavelength-to-time conversion technique using a wavelength dispersive medium is introduced. The experimental results show that the proposed sensor network has a wide strain dynamic range of 2,400 μe and a low crosstalk of 950:1.
Keywords: optical sensor network; code division multiple access; fiber Bragg grating sensor; wavelength-to-time conversion; sliding correlation optical sensor network; code division multiple access; fiber Bragg grating sensor; wavelength-to-time conversion; sliding correlation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Kim, Y.; Jeon, S.-W.; Kwon, W.-B.; Park, C.-S. A Wide Dynamics and Fast Scan Interrogating Method for a Fiber Bragg Grating Sensor Network Implemented Using Code Division Multiple Access. Sensors 2012, 12, 5888-5895.

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