详细解释:n. 准直仪
【化】 准直管; 平行光管
【医】 准直仪, 平行光管
英语解释：
名词 collimator:
a small telescope attached to a large telescope to use in setting the line of the larger oneoptical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam详细解释：
col.li.ma.tor
n.（名词）A device capable of collimating radiation, as a long narrow tube in which strongly absorbing or reflecting walls permit only radiation traveling parallel to the tube axis to traverse the entire length.准直仪，平行光管：一种能使射线成平行状的仪器，如一个狭长试管的强烈吸收或反射的内壁，使得射线只有在和试管轴线相平行时才能穿过整个试管