device and foerfarande foer to bestaemma direction to a laserstraalkaella

摘要

Method and arrangement for determining the direction to a laser beam source. Amplitude peaks in the light occurring when a pulsed laser beam generated by the laser beam source passes through an air space are detected. The detection is carried out with the aid of 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 set as belonging to a limited angle range within which the direction to the laser beam source is assumed to lie. The arrangement 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 system, and an evaluation part 9 which compares detected amplitude peaks in order to establish the direction to the laser beam source. 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 conventional laser-warning systems with a number of fixed receiver lobes, a low-component and thus uncomplicated direction-determining arrangement is obtained.