A process and apparatus for facilitating the landing of a vehicle such as an aircraft on a landing surface by projecting two radiation beams downward from the aircraft at fixed angles criss-crossing the beams below the aircraft coincident with the elevation of the landing gear and producing spots on the landing surface that move together in relation to the rate of descent of the aircraft. The spots come together when the landing gear touches down. Display means is provided to present representations of the spots before the pilot. Movement of the aircraft controls by the pilot to gently bring the spots together will then result in a smooth, safe and well-controlled landing.
A method and device for contactless optical measurement of distance changes, in which two light beams (5, 6) are directed from a measuring table (1) through an optical system (9) in such a manner that they intersect on the surface of the object (11) and in the event of distance changes, the measuring table (1) is adjusted until a scattered light maximum is produced. The light beams (5, 6) exhibit a frequency displacement relative to one another, so that the scattered light which is produced is modulated; this can readily be separated from interfering light by means of amplifiers (15) which are selective in frequency, and in this manner an accurate determination of the scattered light maximum is made possible.
A method for measuring distances and for determining the three-dimensional contour of a workpiece, wherein two intersecting light beams are directed onto the workpiece, the light points produced by the beams on the workpiece surface are determined and the angle of inclination of the striking beam in the common plane thereof is measured.
A display instrument for projecting aircraft flight data upon a transparent screen into the pilot's normal line of sight, wherein an optical objective projects images of luminous objects focused at infinity onto a combining glass; the luminous objects which represent the flight data to be displayed being carried out by means of electro-optical transducers such as electroluminescent diodes supplied by an associated supply circuit; servo means responsive to output signals of airborne sensor devices controlling the displacement of, and the selective supply to, the diodes representative of variable flight data.
The present invention is directed to a method for regulating position of a mining apparatus comprising the steps of transmission of a plurality of signals from a position detection device, interception of said signals at an edge of a mine at a distance away from the position detection device, and adjustment of the position of the mining apparatus to form an intersection between at least two signals at the edge of the mine.
3895870 - Laser dimension comparator - Owned by Autech Corporation (Columbus, OH) [*] Notice:The portion of the term of this patent subsequent to March 12, 1991 has been disclaimed.
A nondestructive dimension measuring and comparing system wherein a coherent light beam is impinged on a workpiece surface to produce one or more spots of light. Back-scattered light from the spot or spots is directed onto a vidicon screen to provide at least two light spot image points which are spaced in proportion to a dimension of the workpiece. The vidicon is scanned to provide output pulses which are time spaced in proportion to the image spot spacing. A scaling oscillator provides scaling pulses which are gated to an up-down counter by the electronically processed, time-spaced pulses. Logic circuitry counts and displays the gated scaling pulses to indicate the dimension, or alternatively, compares the count to a reference and displays the deviation.
