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Archive: https://archive.today/NPzZU

From the post: "One of the world’s most peculiar test beds stretches above Princeton, New Jersey. It’s a fiber optic cable strung between three utility poles that then runs underground before feeding into an “interrogator.” This device fires a laser through the cable and analyzes the light that bounces back. It can pick up tiny perturbations in that light caused by seismic activity or even loud sounds, like from a passing ambulance. It’s a newfangled technique known as distributed acoustic sensing, or DAS."

Archive: https://archive.today/NPzZU From the post: "One of the world’s most peculiar test beds stretches above Princeton, New Jersey. It’s a fiber optic cable strung between three utility poles that then runs underground before feeding into an “interrogator.” This device fires a laser through the cable and analyzes the light that bounces back. It can pick up tiny perturbations in that light caused by seismic activity or even loud sounds, like from a passing ambulance. It’s a newfangled technique known as distributed acoustic sensing, or DAS."

(post is archived)

[–] • 4 pts

omg dude they were so loud last summer

[–] • 1 pt

What I find really strange/interesting is that they can be loud as hell and then all of a sudden its like a switch was flipped and they all go quiet all at once. Its really odd to hear that.

[–] • 1 pt

They react to specific frequencies.

I've noticed they suddenly stop when a plane flies above (that has taken off from a nearby airport).