Development and flight performance of tip-tilt mirror system for a sounding rocket observation of the Sun.

Computer Science – Sound

Scientific paper

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Solar Telescopes: Mirrors, Solar Telescopes: Extreme Uv, Mirrors: Extreme Uv

Scientific paper

A tip-tilt mirror (TTM) system was developed for the XUV Doppler telescope (XDT) on board an ISAS sounding rocket. The spatial resolution of the telescope is about 5″ whereas the pointing stability is only ±0.3° with the rocket pointing control system. To achieve better than 5″stability on the focal plane of the telescope, the TTM system controls the tilt of the secondary mirror with fixed-coil magnetic actuators. The control signal to stabilize focal-plane images is supplied by the position-sensitive detector (PSD) of a pin-hole telescope equipped inside XDT. Closed-loop controls are made with the on-board software on the DSP processor. The sounding rocket was successfully launched on 31 January 1998 from the Kagoshima Space Center of ISAS. TTM worked perfectly during the flight, and achieved better than 5″stability on the focal plane during CCD exposures.

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