Method and apparatus for measuring deep mirrors

Details Method and apparatus for measuring deep mirrors Method and apparatus for measuring deep mirrors

1983-09-26

1986-06-17

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356237, 356241, 356371, 356376, G01B 900, G01B 1124

Patent

active

045952884

ABSTRACT:
A measuring apparatus (11) for measuring the contours of a deep mirror (10) includes a laser (14) for generating a light beam (20). The light beam impinges upon a reflecting surface (16) for reflection therefrom to a point P. The light ray is then reflected from the point P back to the flat reflecting surface (16) and then to an intersection point (34). An axial reflecting surface (36) disposed normal to a central axis (12) reflects the light beam to a second reflecting surface (18). The light ray is reflected off of this surface to a point Q on the inner surface of the mirror (10). The point Q is diametrically opposite the central axis (12) from the point P. The light beam reflected from the point Q is then reflected to the reflecting surface (18) and then to a detector (50) which detects positional deviations in the path of the light beam. The mirror (10) is moved about the central axis (12) relative to the measuring apparatus such that the points P and Q traverse the surface thereof. A processing unit (52) and a positional mechanism (54) are provided to correlate the positional deviations in the light ray path and the relative position of the mirror (10).

REFERENCES:
patent: 2430870 (1947-11-01), Goldberg et al.
patent: 3877788 (1975-04-01), Sprague et al.
patent: 3892494 (1975-07-01), Baker et al.

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