Which preposition to use with detector

of Occurrences 3%

'A death-bed's a detector of the heart.

on Occurrences 2%

"By the time we go camping I'll know a cat track from a squirrel's, or never put a detector on my head again." Piloted by Frank, the two young scouts made their way to the office of the local paper, which had already placed a large bulletin announcing the aeroplane model competition in its window.

in Occurrences 1%

"Eleven, M.P.", however, could mean nothing to anybody but Victorexcept a body clever enough to hide a dictograph detector in a turnip.

Which preposition to use with  detector