Inverse Cassegrainian Systems

Abstract

A general algebraic theory based on first and third order equations has been developed for systems composed of two separated spherical mirrors. The name inverse cassegrainian systems has been provisionally assigned by the author to this general arrangement. One subgroup is the aplanatic Schwarzschild mirror system. The theory not only includes previously known examples of this subgroup, but has revealed the existence of others. In addition, nonaplanatic systems of major potential interest are discussed. These include systems of predecided geometrical arrangement, telecentric systems, inside-out systems, parfocal systems, and others. Means of extending the theory to include nonspherical surfaces are discussed.

Uniform propagation of cathode-directed surface ionization waves at atmospheric pressure

“…Due to the small dimensions of the plasma propagation, highly time-and space-resolved diagnostics are essential to resolve the propagation dynamics, such as cross correlation spectroscopy with sub-ns and sub-mm resolution [27,28] or microscopic imaging to magnify the image [29]. In this paper, we use a reflective ultraviolet (UV) microscope objective based on a Schwarzschild or inverse Cassegrain design [30]. Briefly, it is based on a concentric two-mirror system whose magnified image is free from chromatic aberration and corrected for spherical aberration, coma, and astigmatism.…”

An ultraviolet auroral imager for the Viking spacecraft

“…the camera, a concentric spherical optical system originally used byBurch[1947] (Fraser[1953],Rosin [1968 ], and Wynne [1969 ]) as a reflecting microscope objective, is shown in Figure 1. Components of the system are anchored inside a graphite fiber epoxy composite tube (GFEC) which is sealed with a dust cover.…”