Abstract

We demonstrate distributed measurement of dynamic strain with 1 kHz sampling rate, the highest speed ever reported in Brillouin-based fiber sensors, using the simplified Brillouin optical correlation domain analysis system. Pump and probe waves are generated by direct current modulation of a laser diode applying a pre-compensated rectangular waveform at 100 kHz, and an unbalanced Mach-Zehnder delay line is introduced to the probe wave for the suppression of noise in high speed lock-in detection. Brillouin gain spectrum of single position is acquired at the sampling rate of 1 kHz with position-selectivity, and several kinds of strain variations up to 200 Hz are successfully measured with 10 cm spatial resolution and 20 m measurement range.

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