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39.2 Instrument Capabilities and Design

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The HSP had five detectors: four image dissector tubes and one photomultiplier tube (PMT). There were two image dissectors with photocathodes sensitive to visual wavelengths (VIS and POL) and two sensitive to the near UV (UV1 and UV2). There were no moving parts in the HSP because the target star was positioned in the desired aperture filter combination (each detector had many filters and apertures) by moving the telescope. A particular aperture was sampled by the detector read beam which was positioned by deflection coils in the detector assembly.

The HSP was designed to obtain high speed photometry with the VIS, UV1, and UV2 detectors in any one of the following modes:

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Last updated: 01/14/98 15:59:55