Thanks, I’ve found they use LIDAR, laser radar to detect leaks. Wonder how high or low they go?
LIDAR's really not used for leak detection. LIDAR primarily is for mapping, generating a point cloud of the surroundings for later analysis. Some leak detectors use lasers, but those require the helicopter to fly through the leak plume, and the plume interrupts the laser beam between the emitter and detector, both on the detecting unit, enough to generate a reading
Leak detection is mostly done with Infrared cameras tuned to the proper wavelength, such as certain FLIR units.