Adjustable precision prism

Abstract

The invention discloses an adjustable precision prism which comprises a sighting part, a supporting part, a water level tube stack part and a rotary joint part. The sighting part is installed on the upper portion of the supporting part, the water level tube stack part is installed below one side of the supporting part, and the rotary joint part is arranged below the supporting part. The sighting part comprises a prism barrel, a spring, a supporting base, a pyramid prism body, a first O-shaped waterproof ring and a snap ring; the supporting part comprises a support, a lock screw, a retaining screw, a gasket and a corrugated gasket; the water level tube stack part is installed below one side of the support through a water level tube via the retaining screw, the level of the prism can be adjusted, and working quality is improved; the rotary joint part comprises a protection cover, a second O-shaped waterproof ring, a set screw, a linear gasket, a corrugated gasket, a water level tube, a retaining screw, a rotary joint lever, a spring gasket and a connector. The adjustable precision prism is simple in structure, constants and the right and left positions of the prism can be adjusted, the prism is suitable for measurement operation with a high precision requirement, measurement accuracy is effectively improved, and the prism has good application value.

Description

technical field [0001] The invention relates to an optical element, in particular to an adjustable precision prism. Background technique [0002] Corner cube prism, also called retroreflector, is an internal total reflection prism manufactured according to the principle of critical angle. It is not affected by the size of the incident angle, and reflects the incident light back in parallel to the original direction. Since the shape of the corner cube prism is not a regular cylinder or cuboid, and it is made of glass quartz, it is easy to break; at the same time, the structure of the existing prism frame is too simple, it is difficult to ensure the high-precision combination and installation of the prism and the prism frame, and it cannot meet the high-precision requirements. measurement requirements. [0003] For example, when a prism is installed, it is easy to damage the edge and mirror surface of the prism, which will cause measurement errors and affect the accuracy of s...

AI Technical Summary

Problems solved by technology

Since the shape of the corner cube prism is not a regular cylinder or cuboid, and it is made of glass quartz, it is easy to break; at the same time, the structure of the existing prism frame is too simple, it is difficult to ensure the high-precision combination and installation of the prism and the prism frame, and cannot meet the high-precision requirements. measurement requirements

[0003] For example, when a prism is installed, it is easy to damage the edge and mirror surface of the prism, which will cause measurement errors and affect the accuracy of such instruments that rely on prism edge imaging for automatic tracking and identification

In addition, the constants of the same batch of prisms are usually different, and the consistency between them is difficult to guarantee. When using multiple prisms for precise measurement at the same time, it is necessary to take into account the influence of the error of the prism itself on the measurement results

At the same time, the existing prism needs to rotate the direction of the prism when the measuring station changes but the mirror station remains unchanged. Due to the existence of steering backlash and eccentricity, it is difficult to ensure the level and alignment accuracy of the prism before and after rotation.

The latter two problems mentioned above are more common in high-precision measurements such as CPIII control measurement on high-speed passenger dedicated lines and subway tunnel monitoring, which are likely to cause large observation errors

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