Abstract: An optical encoder for sensing angular position includes a rotatable optical medium having a major surface and an axis of rotation perpendicular to the surface, with a plurality of uniformly sized angular sectors defined on the surface. An annular absolute track is defined on the surface concentric with the axis, a plurality of digital bits being formed on the surface in sequence along the absolute track within each sector. Each such bit is optically readable as a binary 1 or a binary 0, with each plurality of bits defining a binary word. A first series of optically detectable incremental marks are evenly spaced around a first incremental track on the surface. The binary word in a sector is optically read to identify the angular position of that sector and indicate the approximate angular position of the medium, while the first series of incremental marks can be optically detected to refine the approximate angular position indication.

Abstract: A phosphor screen is produced by a vacuum deposition process using a planetary structure for simultaneously rotating and revolving structured substrates within a chamber. A thermal radiation shield is provided at the central axis and, because of the offset positions of the substrates, the deposited phosphor layers are formed with thicker edges than centers to thereby inherently exhibit uniformity correction characteristics. The process allows for single-layer depositions of relatively great thicknesses which, when annealed for relatively short periods of time, are comprised primarily of columnar fibers aligned normally to the substrate to inhibit lateral scattering of generated light within the screen.

Abstract: A wet chlorine generator for providing precisely controlled rates of gas flow for instrumentation purposes, characterized by a safe and reliable gas source provided by precisely controllable electrolysis of a metal chloride electrolyte to form chlorine gas that is then passed through a flow regulating device into a gas conduit that guides the gas from the generator to associated instrumentation.