초록 ▼

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 ima

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.

대표청구항 ▼

A method for determining the direction to a laser beam source emitting a pulsed laser beam, by detecting light having a pulsed character and occurring within the scattering area of the laser beam when the pulsed laser beam generated by the laser beam source passes through an air space, said method c

A method for determining the direction to a laser beam source emitting a pulsed laser beam, by detecting light having a pulsed character and occurring within the scattering area of the laser beam when the pulsed laser beam generated by the laser beam source passes through an air space, said method comprising the steps of: detecting the direction-related amplitude peaks of the light pulses by at least one fixed detector with the aid of at least one rotating receiver lobe with a given limited lobe breadth in the plane of rotation of the lobe for each detector, wherein said amplitude peaks are being related to the direction of the receiver lobe relative to the laser beam source; comprising detected direction-related amplitude peaks in an evaluation unit in order to determine the greatest amplitude peak; and determining the angle of rotation value of the associated receiver lobe, corresponding to the greatest detected amplitude peak by said evaluation unit which angle belongs to a limited angle range which is assumed to include the actual direction to the laser beam source.