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Programmable tilting filter spectrometer for studying gravity waves in the upper atmosphere.

A microcomputer-controlled tilting filter spectrometer for measuring rotational temperatures from the OH (6-2) and O(2) (0-1) airglow bands near 850 nm is described. Instrument performance and benefits achieved at low cost from microcomputer control are discussed. A fast method for determining the rotational temperature that is used in real time is also presented. Results from a first measuring campaign are given that agree well with literature values.