Active Compensation Method for Light Source Frequency Drifting in -OTDR Sensing System


Part-sensitive optical time-domain reflectometry (Φ-OTDR) has the power to make a measurement on external disturbance dynamically along the sensing fiber by monitoring the interference fading pattern variance of the Rayleigh backscattering waveform through continuous probe pulse injection. However, even if there is no disturbance, the received Φ-OTDR trace can still show slow however noteworthy distortion thanks to lightweight supply frequency drifting (LSFD). This trace-to-trace slow distortion makes it difficult to capture low-frequency event. During this letter, an energetic compensation technique based on laser frequency sweep and cross-correlation calculation has been proposed to suppress the influence of LSFD. With the proposed active compensation methodology, the tracking of LSFD can be realized, and the trace-to-trace distortion can be greatly suppressed. The experimental result has shown that a vibration event of 0.five Hz has been identified successfully under mean frequency drifting speed of 1.68 MHz/s, which extends the appliance realm of the Φ-OTDR sensing system to quasi-static measurement.

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