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日本第一测范制作所(株)开发一种小内径测量仪IDM—25。该测量仪用来高精度地测量一般方法难以测定的小孔径(直径小于1mm)或窄缝宽度。其特点是:①采用光反射工件孔壁面的光学测量法。②由于采用光学测定,故测定时不受壁面毛刺等的影响;适于测量精密零件或薄壁零件。③由于是采用光反射法测量孔面,故不受被测件材料的限制,可测各种材料工件。其主要规格是:测量范围:0.1～25mm,被测件大小:最大φ70×45mm,最小示值量0.1μm,重复精度σ0.25μm。
Japan’s first test production company (strain) to develop a small diameter measuring instrument IDM-25. The meter is used to measure small apertures (less than 1mm in diameter) or narrow widths that are difficult to measure with conventional methods with high accuracy. Its features are: ① using optical reflection of the workpiece hole wall optical measurement method. ② As a result of optical determination, so the determination of free from burrs and other effects; suitable for measuring precision parts or thin-walled parts. ③ Because it is the use of light reflection method to measure the hole surface, it is not subject to the material under test, measuring various materials and workpieces. Its main specifications are: Measuring range: 0.1 ~ 25mm, the measured piece size: the largest φ70 × 45mm, the minimum indication of 0.1μm, repeat accuracy σ 0.25μm.