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由我厂新研制的15″光学自准直比较测角仪主要技术指标是:入瞳直径D=50mm;物镜焦距f′_(?)=500mm;目镜焦距f′_目=20mm;视角放大率Γ=25~×;出瞳直径D′=2mm;镜筒长度为350mm;视场范围为30′;读数精度为15″。物镜型式和仪器外形分别如图1和2所示。这是类似经纬仪内调焦望远镜那样的物镜形式。该仪器具有镜筒短、焦距长、口径大、结构简单、操作方便、刚性好、视场清晰、精度可靠等优点。
The 15 “optical self-collimating goniometer developed by our factory is mainly composed of: the entrance pupil diameter D = 50mm; the focal length of the objective lens f ’_ (?) = 500mm; the focal length f’_ of the eyepiece is 20mm; Rate Γ = 25 ~ ×; exit pupil diameter D ’= 2mm; barrel length of 350mm; field of view range of 30’; reading accuracy of 15 ”. Objective lens type and appearance of the instrument are shown in Figures 1 and 2, respectively. This is similar to the theodolite telescope telescope that kind of objective form. The instrument has a short tube, long focal length, large diameter, simple structure, easy operation, good rigidity, clear field of view, accuracy and reliability.