Abstract: Laser-warning method and a laser-warning arrangement, which laser-warning arrangement is intended to warn of laser light from a laser beam source which is used for guiding projectiles, missiles and the like, for example laser light from a pulsed laser beam which is directed towards a target area. The time for the laser beam to reach the laser-warning arrangement, the so-called impact time, is calculated from a first amplitude value, measured at a first point in time, of the scattered light from the laser beam and a second amplitude value, measured at a second point in time, of the scattered light from the laser beam, and the measured time difference between the said first and second points in time on the basis that the amplitude raised to a constant is proportional to the distance to the laser beam according to the equation D=K.multidot.A.sup.n, where K and n are constants, D is the perpendicular distance to the laser beam and A is a measured amplitude value.

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.