System for the measurement of ultra-low stray light levels

Details System for the measurement of ultra-low stray light levels System for the measurement of ultra-low stray light levels

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978msfc.reptq....w&link_type=abstract

Patent National Aeronautics and Space Administration. Marshall Space Flight Center, Huntsville, AL.

Physics

Baffles, Hubble Space Telescope, Light Scattering Meters, Luminous Intensity, Shielding, System Effectiveness, Multipath Transmission, Patents, Photomultiplier Tubes, Ruby Lasers, Suppressors

Scientific paper

An apparatus is described for measuring the effectiveness of stray light suppression light shields and baffle arrangements used in optical space experiments and large space telescopes. The light shield and baffle arrangement and a telescope model are contained in a vacuum chamber. A source of short, high-powered light energy illuminates portions of the light shield and baffle arrangement and reflects a portion of same to a photomultiplier tube by virtue of multipath scattering. The resulting signal is transferred to time-channel electronics timed by the firing of the high energy light source allowing time discrimination of the signal thereby enabling the light scattered and suppressed by the model to be distinguished from the walls and holders around the apparatus.

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