Slit imaging system using two concave mirrors

Details Slit imaging system using two concave mirrors Slit imaging system using two concave mirrors

1984-06-14

1987-01-06

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

For spectrographic investigation

350619, 356328, 356334, G01J 318, G02B 510

Patent

active

046342761

ABSTRACT:
Configurations of optical systems using two concave mirrors to image an off-axis slit are used advantageously in monochromators or spectrographs in which the coma produced by one mirror is cancelled by that produced by the other mirror. However, such systems produce a curved line image of a straight line slit. This curvature is substantially removed in a two concave mirror optical system in which the off-axis angle and the separation 2L between the mirrors are chosen so that the principal ray OP.sub.1 from the center of the line object to the first mirror and the principal ray P.sub.2 I from the second mirror to the center of the line image are both substantially perpendicular to an axis of symmetry of the optical system which passes through the centers of curvature C.sub.1, C.sub.2 of the two concave mirrors. The image line is then curved in a plane normal to the image plane and appears substantially straight in the image plane.

REFERENCES:
patent: 2797609 (1957-07-01), White
patent: 3575511 (1971-04-01), Francis

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