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传统光学平直度检查仪/准直仪(如哈量1401型上机HYQ型,分度值为0.005mm/m)是角度/平直度计量领域中应用广泛的一种精密光学仪器。它是利用光学自准直原理进行微小角度测量的光学仪器,具体原理为:光线通过位于仪器物镜焦平面的分划板后,经物镜形成平行光,平行光被垂直于光轴的反射镜反射回来,再通过物镜,在焦平面上形成分划板像,与测量标线重合在同一测量面上,当反射镜倾斜一个微小角度α时,反射回来的光束就倾斜2α,形成光学放大角度作用。
Traditional optical flatness tester / collimator (such as the Haha 1401 on the type of machine HYQ, dividing the value of 0.005mm / m) is the angle / flatness measurement widely used in the field of a precision optical instruments. It is the use of optical self-collimation principle of micro-angle measurement of optical instruments, the specific principle is: light through the focal plane of the instrument objective lens reticle, through the objective lens to form parallel light, parallel to the optical axis of the mirror is reflected Back, and then through the objective lens, the formation of the reticle in the focal plane, and the measurement line coincidence coincidence measuring surface, when the mirror is tilted a slight angle α, the reflected beam is inclined 2α, forming an optical zoom angle .