METHOD OF MEASURING ANGLE OF DIVERGENCE OF LIGHT BEAM Russian patent published in 2007 - IPC G01B11/26 

FIELD: measuring technique.

SUBSTANCE: method can be used for checking angle of divergence of light beam. Light beam, having angle of divergence to be found, is focused in focal plane where two optical wedges are disposed. Wedges diverge light half-spots in different directions; spots are imaged by projection lens in registration plane. Part of beam is deflected into plane of image of source to be disposed at distance of 2f" from focusing system where size d2 of image of source has to be measured. Source is mounted in front of focusing system at distance of 2f', where f' is focal length of focusing system. Then sizes d1 of deflected spots are measured and angle of divergence Θ is calculated from relation of sinΘ/2=-1/+2[1/f' (d2xd1/d2+-d1)], where "+" sign is chosen in case of prefocal crossing of beams and "+" sign is chosen in case the beams cross behind focal plane.

EFFECT: improved precision of measurement.

4 dwg