Once the mine is armed and ready to engage, the acoustic sensor listens for a valid noise input.

Ultrasonic gas detectors use acoustic sensors to detect changes in the background noise of its environment.

Passive acoustic sensors can detect aircraft flying low over the sea.

Coupled with acoustic sensors that recognize the sound signature of a tank, it could offer high accuracy.

The thunder was too loud to be heard; the gleisner's acoustic sensors shut down in self-defense.

By now the water around it was virtually peppered with the small acoustic sensors and transmitters.

The changes included streamlining to make them quieter and improved acoustic sensors.

Some systems use an acoustic sensor linked to the preemption system.

We are trying to develop a small enough acoustic sensor to track them.

And with systems that use magnetic and acoustic sensors, the human subject is often tethered to wires.