Abstract: A test system (10) for a laser rangefinder (12, 14) having signal transmission and reception paths comprises a thick lens collimator (20) which receives energy (18) from a transmitter (12) for input through an optical fiber (32). The fiber has a partial reflector (34) and a full reflector (38) to simulate sites of targets, and the reflected energy is transmitted back through collimator (20) to a receiver (14). Partial reflection of energy is provided by gold (64) placed on a surface (53) of one of two aligned and spaced termini (32a, 32b) of fiber (32).
Abstract: A laser rangefinder, where the laser is of the passive Q-switched type, is functionally tested. In a method and apparatus for functionally testing the laser rangefinder, the excitation voltage for actuating the laser is raised above the normal voltage, so that the laser sends two light pulses where it normally sends a single one. The pulses are respectively interpreted as a pulse sent from the rangefinder and as a received reflected pulse. A high-voltage unit for providing the excitation voltage is coupled with a feedback circuit in which there is included a voltage divider provided with a switch such that during testing the excitation voltage can be increased so that the laser sends the two required light pulses.
Type:
Grant
Filed:
November 23, 1982
Date of Patent:
November 12, 1985
Assignee:
Telefonaktiebolaget LM Ericsson
Inventors:
Karl H. Johansson, Anders S. Severinsson
Abstract: Apparatus for aligning an aircraft landing aid projector of the type which comprises a light source located at the focus of a parabolic reflector, a lens mounted coaxially with the parabolic reflector and a filter disposed intermediate the reflector and lens close to the focal point of the lens. The apparatus comprises a base having a surface portion for supporting a projector, a lens for focussing light from the projector onto an image receiving means and means allowing observation of the image receiving means. The filter of a projector is correctly positioned when it appears in focus on the image receiving means.
Type:
Grant
Filed:
March 10, 1981
Date of Patent:
February 7, 1984
Assignee:
Research Engineers Limited
Inventors:
Robert M. Payne, Christopher A. R. Haire
Abstract: An optical reflective device for reflecting electromagnetic energy such as aser energy into a two-way spatial transform apparatus and onto a target for reflecting the energy back to the transform apparatus and onto a detector in an off-set input transform plane to cause far field pattern of the target to be located on the detector. Transmissive optics as well as reflective optics can be used in the optical reflective device.
Type:
Grant
Filed:
September 30, 1974
Date of Patent:
January 13, 1976
Assignee:
The United States of America as represented by the Secretary of the Army