Abstract: An apparatus for multi-image viewing includes a first hollow eye piece housing having a first eye aperture and a concentric second equator aperture; and a second hollow lens housing having a third equator aperture and a concentric fourth lens mount aperture. A multifaceted disc-like, prismatic lens is seated within the lens mount housing in fixed relation to the lens mount aperture. The diameter of the outer periphery of the lens exceeds that of inner periphery of the lens mount aperture. The first hollow housing is permanently bonded to the second hollow housing at their equator apertures.

Abstract: A hand held or table positioned mat selection device (FIG. 1) in which the viewing eyepiece (28) is used to restrict the field of view to a mat or mats (FIG. 13: 40A, 40B and 40C) and their apertures (41C) in a carrier (36) which may be moved forward or backward so as to fill the periphery of the visual field, and with the viewing device aimed at the picture to be matted 20 (FIGS. 9A and 9B) so that the illusion of a mat surrounding a picture (FIG. 11) is created and preserved. The capacity of the mat selection device for monocular viewing (FIG. 3A) and binocular viewing (FIG. 3B) is described.

Abstract: A compression coupling system is employed for attaching one optical or electro-optical component to another in a manner such that different diameters of devices readily may be coupled together without causing any cosmetic defects from the coupling function. The first component to which the other component is to be attached has a cylindrical portion on it; and the other component has a hollow cylindrical extension on it, with an internal diameter which is equal to or greater than the external diameter of the first component. A cylindrical sleeve/shim having a thickness which is equal to the difference between the external diameter of the first component and the internal diameter of the extension is placed between the two devices which then are fitted, one over the other. A compression ring and locking ring secure the devices together by compressing the locking ring onto the body of the first component.

Abstract: A generally rectangular tensioned cover comprises a pair of end forms having end portions. They are generally parallel along their lengths. A pair of side rails which are generally orthogonal to the end forms have first and second end portions. They are spaced substantially the lateral separation of the end forms with the end portions of each side rail positioned adjacent the end portions of an end form. A tensionable sheet spans from one side rail to the other and from one end form to the other. The sheet's first end portions are attached along the end forms. The lateral peripheral portions of the sheet are attached along the side rails. The end portion of the one end form is fastened to the first end portions of the side rails. The end portion of the other end form is fastened to selectable regions of the second end portions of the side rails. The sheet is tensioned longitudinally between the end forms.

Abstract: In an aero-optical interface for an aircraft optical aperture, the separation of the upstream boundary layer from the edge of the aperture creates a region of turbulance which persists downstream over the full area of the aperture. This invention promotes an early develpment of a steady velocity profile at the upstream aperture edge which is approximately the same as a stable, self-similar shear flow velocity profile over the entire aperture. This is accomplished by thickening the boundary layer upstream of the aperture, and blowing a curtain of air across the aperture from its upstream edge at the point of separation of the boundary flow. This produces a shear flow region foot that causes the overall velocity profile to be equal to a stable self-similar free shear layer.

Abstract: A fluid sample flow cell including a high pressure fluid tight circumferential edge seal for a window in the body of the flow cell.

Abstract: A dual axis translation device and system in accordance with this invention, for translating an optical beam along both an x-axis and a y-axis which are perpendicular to one another, has a beam directing means acting on said optical beam for directing the beam along a particular path transverse to said x and y axes. An arrangement supporting said beam directing means for movement in the x and y direction within a given plane is provided. The arrangement includes a first means for translating said beam directing means along the x-axis in said given plane in order to translate the beam along said x-axis. The arrangement comprises a second means for translating said beam directing means along the y-axis in said given plane in order to translate the beam along said y-axis.

Abstract: This illumination system produces a light beam of selected cross-section shape and uniform intensity, which emits self-luminously into a selected numerical aperture, by: providing a non-uniform, non-self-luminous laser light beam; configuring the beam to eliminate the non-uniformities near the beam periphery; providing the semi-uniform light beam to a light gate; providing also a lamp light beam with optics and infra-red trap; gating selectively the laser light beam or the lamp light beam to a light beam characterization subsystem; configuring the selected semi-shaped semi-uniform non-self-luminous light beam to provide a selected shaped semi-uniform non-self-luminous light beam; focusing the selected shaped semi-uniform non-self-luminous light beam, with a focal length related to the selected numerical aperture, onto the input plane of a total-internally-reflective beam-shaper-uniformizer, causing multiple reflections within the uniformizer and overlapping of different parts of the beam with one another, the

Abstract: In order to reduce the light reflectance, an optical element comprises an optical element body formed of an optical crystal or a lens, and glass members with a prescribed refractive index, wherein the glass member is bonded to each of the light incident and emergent surfaces of the element body by an adhesive agent with a prescribed refractive index. The optical element body will not be affected adversely even if it is made of a crystal which is vulnerable to heat.

Abstract: An optical window member comprises a substrate having a multiplicity of through-holes, and a diamond film formed on one surface of the substrate and covering the through-holes. A method for producing the optical window member comprises forming a thin film of diamond on one surface of the substrate, imparting a pattern to a photoresist layer formed on the substrate for partially exposing the substrate, and removing the exposed part of the substrate by etching thereby partically forming a diamond monolayer region. The thus obtained substrate possessing a multiplicity of through-holes assumes a lattice-like form, gives shape to the diamond monolayer region and, at the same time, prevents the thin diamond film from being warped or curved, and imparts improved compression strength to the diamond film and protects the diamond film against fracture.