infrared under water

[mdfx00]

The technology I believe is based on photo multipliers... It's where a single photon passing through the scope causes a cascade of increasing number of electrons. The more electrons the brighter the image. It works on visible light, UV as well as IR.

 

[seekerGH]

Perhaps you should try UV instead of IR. This video has some great explanations.

 

[agflit]

you may be thinking of "LIDAR"

Marine Scanners On RIEGL USA, Inc.