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




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Gwangju Institute of Science and Technology GIST, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea





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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. View Full-Text

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





Author: Youngbok Kim, Sie-Wook Jeon, Won-Bae Kwon and Chang-Soo Park *

Source: http://mdpi.com/



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