It was used in some of the first infrared detectors.

Don't go any closer, the infrared detectors will pick us up.

Angelo went in first to make sure there were no infrared detectors or lasers.

No, he didn't have an infrared detector, but the astronomers on Farside might be able to help.

Luke turned up the screen of his infrared detector to see the green against black clearly.

The system uses infrared and radio detectors to monitor unusual movement in the track area.

Earlier, he'd given Daily a crash course on how to read the infrared detector.

This is done with infrared detectors that sense the difference between the heat from the Earth and the cold of space.

"According to the infrared detectors," the man at the console said, "they aren't down there yet."

The simplest infrared detector would have spotted a flight of this size.