Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1990-04-27
1991-08-20
Wallace, Linda J.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
2502033, G01C 100
Patent
active
050408925
ABSTRACT:
Method and apparatus for determining the direction to a laser beam source includes detecting amplitude peaks in the light occurring when a pulsed laser beam generated by the laser beam source passes through an air space. The detection is carried out with at least one rotating receiver lobe which images the scattered light on an associated fixed detector. The detected amplitude peaks are compared in order to determine the greatest amplitude peak. The angle of rotation value of the receiver lobe, when the greatest amplitude peak is detected, is determined as belonging to a limited angle range within which the direction to the laser beam source is assumed to lie. The apparatus comprises a rotatable optics system, a fixed detector system which detects the magnitude of the light transmitted through the optics system to the fixed detector, and an evaluation part which compares detected amplitude peaks. The optics system comprises at least one light input with, counting from each light input, a first cylindrical lens, prism, reflector, filter, second cylindrical lens, diaphragm and glass block. By using a rotating receiver lobe instead of a plurality of fixed receiver lobes, a low-component and thus uncomplicated direction-determining apparatus is obtained.
REFERENCES:
patent: 3989942 (1976-11-01), Waddoups
patent: 4674874 (1987-06-01), Halldorsson et al.
patent: 4687923 (1987-08-01), Bauck
patent: 4855588 (1989-08-01), Holmes
patent: 4867556 (1989-09-01), Bjorkman
Bofors Electronics AB
Wallace Linda J.
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