Abstract:In order to improve the detection accuracy of the laser warning system for laser irradiation angle, a new detection method is proposed, for which, first the laser is converged to line spots by a cylindrical lens and then received by a two-element photodetector. The shape of two photosensitive elements of the photodetector is designed as a right trapezoid, and spliced into a rectangle. When the line spot is irradiated within the rectangular photosensitive area, the two photo sensitive elements receive unequal light intensity, and then the angle of laser irradiation can be calculated according to the difference of two output signals. Experimental results show that this method can more accurately detect laser irradiation orientation, and the detection error of the test system for laser irradiation angle is less than ± 0.21 °, better than traditional non imaging channel detection technologies.
