System for the measurement of ultra-low stray light levels

Optics: measuring and testing – Photometers

Patent

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Details

356124, G01N 2148, G01B 900

Patent

active

041025806

ABSTRACT:
An apparatus for measuring the effectiveness of stray light suppression light shields and baffle arrangements used in optical space experiments. 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.

REFERENCES:
patent: 3645629 (1972-02-01), Dagnall
C. Leinert et al., Stray Light Suppression in Optical Space Experiments, Mar. 1974, Applied Optics, pp. 556-564.

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