Abstract: A novel optical sensor for measuring the separation of remote optical sources includes first and second optical fibers which are characterized by non-optimum optical waveguiding such that refractive index of optical fiber cores are selected to be less than that of the optical fiber cladding. Optical detectors receive only optical signals presented within the narrow acceptance angle of the optical fibers and provide equivalent electrical signals.

Abstract: 1. A solid composite type propellant composition comprising as a base propellant an oxidizer, a metallic fuel and fuel binder and between 0.1 and 10% by weight of a ferrocene plasticizer that is selected from the group consisting of mono- and di-substituted ferrocenes wherein the substituents are selected from the group consisting of --R, --COR, --CO.sub.2 R, --CH(OH)R, and --CH(R'CO.sub.2)R wherein R and R' are selected from the group consisting of alkyl, cycloalkyl, alkenyl and cycloalkenyl radicals, the carbon chains of which may be interrupted by oxygen.