Abstract
A line-based fiber optic sensor employing time delay estimation to locate time-varying disturbance is
proposed. The sensor consists of two line-based interferometers, multiplexed with a broadband light source,
interfering unit and sensing fiber by wavelength division multiplexer, and hence detected signals with different
wavelengths generated by the same disturbance are obtained. After a unique data processing algorithm, two signals with
fixed time delay are achieved and the time delay is determined by the position of the disturbance. By the signal
correlation method to extract the time delay, the position of the disturbance can be measured. The performance of the
sensor is examined and compared with the conventional sensor, based on the null frequency of the spectrum of the phase
difference generated by the disturbance, through an experimental setup with the total length of sensing fiber up to
70 km. Experimental results show that the sensor is advantageous for easy installation, low location error and
flexibility, especially in long-distance perimeter security application.
© 2013 IEEE
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