Air Dielectric Split Metal Right Angle Prism

Abstract

The invention proposes an air medium split metal rectangular prism. It adopts a split metal reflective structure, including reflector 1 and reflector 2, the reflector 1 cross-section is a right-angled trapezoid, and the reflector 2 cross-section is triangular; Vertically, pass through the reflector 2 and the reflector 1 in turn through the assembly screws, adjust the installation angle so that the two metal reflective surfaces of the reflector 1 and the reflector 2 form a hollow 90 ° prism; the material of the reflector 1 and the reflector 2 is 9Cr18, through grinding to ensure that the flatness of the metal reflective surface is not greater than 0.05μm. In the present invention, the two reflectors are installed in combination, and the reflective surface is an air medium, so that the imaging definition is greatly improved; the main body of the prism is made of stainless steel metal material, the deformation coefficient is small, the corrosion resistance is high, and the maintenance is simple.

Description

technical field [0001] The invention belongs to the field of measurement of geometric quantities and angles, and relates to a triangular prism for angle measurement, in particular to a split-assembled metal right-angle prism. Background technique [0002] Generally, when using the angle measuring instrument with the principle of self-collimation to carry out the measurement work, a plane mirror or a glass right-angle prism is generally used as the target mirror. [0003] When using a plane mirror as the target reflector, the reflector is generally made of glass or metal, and is made by coating the reflective surface of glass or grinding the reflective surface of metal. In order to perform self-collimation measurement, the center of the optical axis of the test instrument must be perpendicular to the reflective surface of the plane mirror in both directions of pitch and azimuth. In order to reduce the measurement error, the center of the optical axis of the test instrument mu...

AI Technical Summary

Problems solved by technology

However, the integral glass prism has certain limitations: (1) The parallel light emitted by the test instrument exits along the optical axis, and passes through the inclined glass and is reflected by the reflective surface of the prism at a 90° angle, but the light propagation path is from the air medium to the glass medium , after being reflected by two reflective surfaces and then returning from the glass medium to the air medium, the loss of light energy increases due to the difference in the propagation medium, and the definition of imaging decreases; (2) In order to ensure that the test instrument returns light clearly and reduces test errors, the prism The deviation of the 90° angle between the two reflective surfaces cannot be greater than ±2", and there are strict requirements on flatness. The integral glass prism meets these two requirements at the same time, making its manufacturing process very difficult and expensive; (3) Overall The three surfaces of the type glass prism (two reflective surfaces and the slope) should be perpendicular to a plane at the same time, otherwise it will cause "tower difference", which will have a certain impact on the angle of the test; (4) The slope of the prism is a glass surface There is also a certain amount of reflection, and two return images will occur during the test, which will mislead the tester and easily cause test errors

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