Towed on cables by two ships - soon to be three - on a precise grid pattern over a 23,000 square mile area, the devices emit a pulse to the seabed.

The instrument uses fourteen polyvinylidene fluoride detectors, which emit a pulse of charge when impacted by a hypervelocity dust particle (velocity).

Active sonar emits a pulse of sound that bounces back when it meets an object, revealing the location of vessels.

Simple comparing circuits had two entries and one exit that emitted a pulse whenever pulses arrived at the entries at different times.