| 摘要 |
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 Theta is calculated from relation of sinTheta/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 |
