heat sensor

They actually caught the second guy with a heat sensor from the aerial unit.

The helicopter had been sent from the New York State Police headquarters in Albany; it had, we were told, a special infrared heat sensor.

If the girl didn’t comply, Mike would know: The Biobloc device has a data-collecting heat sensor that lets him see, on a computer chart, how many hours his patients spend wearing it.

"She asked me to go round and see if there's anything to be done, and then to my horror, once I'd put a heat sensor device on and found out where they were located, everything just unfolded from there."

In addition to its French-UK seismometer package, the probe is equipped with a heat sensor that aims to burrow into the ground, and an exquisite radio experiment that will measure how the planet wobbles on its axis.