Small-angle block gauge

Abstract

The invention provides a small-angle block gauge which is suitable for a working angle of less than 1 degree and meets the calibration and the small-angle detection of a small-angle measuring instrument. The small-angle block gauge comprises an angle block gauge base fixed above an installation base plate; two installation surfaces are spaced at the same side surface of the angle block gauge basein the vertical direction; an upper reflector is installed in the upper installation surface; a lower reflector is installed in the lower installation surface; a transmission refractor is arranged before the upper and the lower reflectors; and the transmission refractor is also fixed above the installation base plate. The small-angle block gauge has the advantages of novel structure, convenience for installation, stable performance, high degree of accuracy, good repeatability of measurement and easiness for the reproduction of angle; and the small-angle block gauge is applied to the measurement and the calibration of the small-angle measuring instrument and can effectively avoid the problem of the alignment of an optical shaft during the conversion of a measuring surface so that the installation complexity of the angle block gauge is reduced.

Description

technical field [0001] The invention belongs to the technical field of geometric quantity measurement, and in particular relates to a small-angle angle block with an angle range of -1° to +1°. Background technique [0002] The laser small-angle measuring device is a measuring instrument for measuring small angles from -1° to +1°, with high measurement accuracy and a measurement uncertainty of U=0.05″(k=2). The calibration and measurement of the laser small-angle measuring device Value transfer requires angle block as a standard tool, but the traditional angle block 1 adopts a left-right horizontal layout structure on the working surface, and the angle between the normals of two adjacent working surfaces is used as the working angle, see figure 1 shown. The intersection point of the center normals of the two working surfaces is the center of rotation of the angle block, and the optical axis of the autocollimator measured with the angle block coincides with the center normal ...

AI Technical Summary

Problems solved by technology

The formula D=L / 2tan(θ / 2) shows the relationship between the distance D from the center of rotation to the working surface and the angle of the angle block. When the angle of the angle block is less than 1°, the distance from the center of rotation to the working surface is even as long as 1m, which gives the angle The installation of the blocks poses great difficulties

At the same time, it is more troublesome to process angle blocks with a working angle of less than 1°, and the scrap rate is high, resulting in a significant increase in the cost of angle blocks

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