“Distributed acoustic sensing” looks for disturbances in fiber to detect earthquakes and even insects. Can it also improve rail safety?
Stretching thousands upon thousands of miles under your feet, a web of fibrous ears is listening. Whether you walk over buried fiber optics or drive a car across them, above-ground activity creates a characteristic vibration that ever-so-slightly disturbs the way light travels through the cables. With the right equipment, scientists can parse that disturbance to identify what the source was and when exactly it was roaming there.
“What we’re doing is profiling the track, looking for changes in the acoustic signature,” says Daniel Pyke, a rail expert and spokesperson for Sensonic, which develops DAS technology for railroads. “We know what track should sound like, we know what a train should sound like. And we know that if it’s changing—so let’s say this joint is coming loose—that needs someone to go and fix it before it becomes a problem.
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