Abstract:
A navigation system in which a spacecraft ''''fix'''' or positional information is obtained by producing, from collected light, an image of a field of view from the spacecraft and thereafter comparing this image, in coherent light, with a spatial filter of a reference region. Correlation results in application of one input signal to a navigation computer. Comparison with a second input signal supplied to the computer from an inertial reference affixed to optical means for gathering the light emanating from the viewed region results in production of useful navigational data by the computer.
Abstract:
This invention relates to holography, and more particularly to a method and apparatus for rapidly making highly efficient spatial filters for holography.
Abstract:
The optical projection of information stored in a relief image such as a pattern of surface deformation of a light reflecting medium is accomplished by a projector which images on a screen the foci of either of the two sets of mirrors produced by the curved surfaces of the deformations. The hollows or concave mirrors provided by the bottoms of the deformations have their foci in front of the recording and when imaged on a screen by the projection optics provide a bright line image on a light background. The convex mirrors at the edges of the deformations have their foci (virtual) located to the rear of the recording and when imaged on the screen by the projection optics provide a dark outline of the deformations on a light background. In the embodiment illustrated, the projector is a reader and is provided with a back projection screen at the same end of the reader as the recording to be projected and the projection path includes suitable mirrors for reversing the direction of the projected light.
Abstract:
An optical system, comprising a single light source, collimating optics, collecting optics, and a detector, sequentially scans coded, apertured discs to produce a pulse code indicative of the rotational position of said discs.
Abstract:
A contour measuring system is disclosed in which the contour, surface texture and roundness of cylindrical members can be readily determined optically. Specifically, a slit camera converts the cylindrical surface to a planar surface, a picture. The illumination for the picture is provided by thin sheets of light in a plane approximately parallel to the axis of the cylinder and tangential to the surface. The image thus recorded resembles a topographical map of the cylindrical surface.