Spectrometers
WATS
The Wind and Temperature (WATS) experiment on the Dynamics Explorer-2 (DE-2) spacecraft consists of a closed source neutral mass spectrometer with two rectangular baffles, which are swept across the incoming neutral beam. The modulation of the neutral flux by the baffles allows measurement of the temperature and gas velocity. The mass was commendable and was usually selected to be N2 or O.