Telescope accessory

Optics: measuring and testing – Of light reflection

Reexamination Certificate

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C356S446000, C250S353000

Reexamination Certificate

active

07130051

ABSTRACT:
In an embodiment according to the present invention, a coronagraph for detecting reflective bodies external to a light source is provided. A first mirror for directing a beam of light onto an occulting mask is adjusted based on a data from a fiber optic sensor or a second sensor. An occulting mask for separating the beam into a first and second portion directs the first portion onto a fiber optic sensor and the second portion onto a Lyot stop. The occulting mask is adjustable based on data from the second sensor. The Lyot stop separates the second portion of the beam into a third and fourth portion. The Lyot stop also directs the third portion of the beam onto the second sensor and the fourth portion of the beam onto a camera for detecting one or more reflective bodies external to a light source.

REFERENCES:
patent: 3963328 (1976-06-01), Abel
patent: 5291333 (1994-03-01), Mills et al.
patent: 5450352 (1995-09-01), Ftaclas et al.
James P. Lloyd, et al., “Astronomical Coronagraphy with High Order Adaptive Optics”, Proc. SPIE . vol. 4490, pp. 290-297, (Dec. 2001).
E.E. Bloemhof, et al., “Behavior of Remnant Speckles in an Adaptively Corrected Imaging System” Astrophysical Journal, 558:L71-L74, Sep. 1, 2001.
B,R. Oppenheimer, et al., “A Coronagraphic Survey For Companions Of Stars Within 8 Parsecs”, Astrophysical Journal 121:2189-221, Apr. 2001.

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