Mathematics – Logic
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.232..223t&link_type=abstract
In ESA Proceedings of 3rd European Symposium on Spacecraft Materials in Space Environment p 223-228 (SEE N86-22593 13-18)
Mathematics
Logic
Faint Object Camera, High Voltages, Hubble Space Telescope, Potting Compounds, Electrical Engineering, Failure Analysis, Image Intensifiers
Scientific paper
Potting the high voltage parts on the photon detector of the Faint Object Camera (FOC) for the Space Telescope is described. The detector is required to have very high gain to provide a logic level signal for digital processing. Gain is provided by an image intensifier and a video camera tube, the former operating at up to 42KV (normally at 38KV) and the latter in the range -6.5 to -12KV (normally -10KV). Experience in developing the detector (including catastrophic failures) shows that when high voltage circuits are potted it is essential to define and control potentials on all surfaces. It is strongly recommended that a dummy unit be potted with pressure and stress gages to determine the forces involved in curing and environmental test cycles. The application of partial discharge testing is essential for assemblies and desirable for past screening (cables, correction techniques at least). Potting should be under vacuum and scrupulous attention must be paid to cleanliness of surfaces to be potted and all containers and equipment used for priming and potting.
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