A research aircraft contains many different kinds of instruments. For most of them, some kind of inlet is mounted on the outside and is connected to instruments inside the aircraft. For e
xample, the long tube on the roof is an aerosol inlet that brings aerosol particles to a mass spectrometer in the cabin. In a similar manner, optical fibres guide photons from the sensors on the top and the bottom of the fuselage to a set of spectr
ometers inside. Some instruments have special windows, like the lidar and the cameras that look through openings in the bottom of the aircraft. Such openings are usually hidden behind roller doors to protect them from gravel damage during take-off and landing. Other gadgets visible on the outside include meteorological sensors, GPS and radio antennas, etc.
xample, the long tube on the roof is an aerosol inlet that brings aerosol particles to a mass spectrometer in the cabin. In a similar manner, optical fibres guide photons from the sensors on the top and the bottom of the fuselage to a set of spectr
ometers inside. Some instruments have special windows, like the lidar and the cameras that look through openings in the bottom of the aircraft. Such openings are usually hidden behind roller doors to protect them from gravel damage during take-off and landing. Other gadgets visible on the outside include meteorological sensors, GPS and radio antennas, etc.
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