Abstract: An adjustable reflector apparatus for redirecting an incident beam of light in a direction substantially normal to its incident direction. The apparatus includes a fixed reflector assembly and a movable reflector assembly, each having a flat mirror, and a device for securing the two assemblies together such that the beam is reflected successively by the two mirrors. The apparatus further includes a special adjustment device for precisely adjusting the angle between the two mirrors, and thereby correspondingly adjusting the angle between the incident beam and the redirected beam to be precisely 90 degrees.

Abstract: An omnidirectional fiber optic laser beam sensing apparatus for particular use in detecting the elevation of a light beam. A plurality of optical fibers are arranged to receive light from a plurality of separate elevation zones and to transmit the light to a lesser plurality of phototransducers located within a grounded enclosure. The fibers corresponding to each elevation zone are grouped into separate fiber bundles and oriented to direct the light to a common phototransducer, whereby each phototransducer senses light received within a separate elevation zone.