A six-degree-of-freedom laser measurement system

By designing a six-degree-of-freedom laser measurement system, and utilizing oblique laser triangulation, autocollimation measurement, and visual imaging technology, the system achieves individual measurement of each degree of freedom, solves the degree-of-freedom coupling problem, and achieves miniaturization, integration, and cost reduction, thereby improving measurement accuracy and real-time performance.

CN121185181BActive Publication Date: 2026-06-19NORTHEAST FORESTRY UNIV
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Patent Information

Application Number
CN202511328745.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-17
Publication Date
2026-06-19
Estimated Expiration
2045-09-17

AI Technical Summary

Technical Problem

In existing six-degree-of-freedom measurement systems, there is a coupling relationship between the degrees of freedom, which affects the measurement accuracy. Furthermore, traditional equipment is large in size, expensive, and difficult to integrate.

Method used

Using oblique laser triangulation, autocollimation measurement, and visual imaging technology, three optical systems were designed to share a portion of the optical path and a single laser source. The Z-axis displacement and X and Y-axis rotation angles were measured separately, and the X and Y-axis displacement and Z-axis rotation angle were measured separately. A cross-shaped circular reflective target was used to achieve individual measurement of each degree of freedom.

Benefits of technology

It achieves six-degree-of-freedom non-contact measurement, avoids coupling between degrees of freedom, and enables system miniaturization, integration, and cost reduction, while improving measurement accuracy and real-time performance.

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Abstract

This invention discloses a six-degree-of-freedom laser measurement system belonging to the field of precision measurement technology. It includes a laser source, a collimating and beam-expanding lens, three beam-splitting prisms, a reflector, a cross-shaped circular reflective target, two focusing lenses, three CCD cameras, and a telecentric lens. Based on the different degrees of freedom being measured, it is divided into a first optical system, a second optical system, and a third optical system. The first optical system uses the principle of oblique-shot laser triangulation to measure the displacement of the object along the Z-axis. The second optical system uses the principle of self-collimation to measure the rotation angles of the object along the X and Y axes. The third optical system uses the principle of visual imaging to measure the displacement of the object along the X and Y axes and the rotation angle along the Z-axis. This invention employs an optical path multiplexing mechanism, significantly reducing the number of components and achieving system miniaturization, integration, and low cost. The six degrees of freedom are measured independently, avoiding coupling relationships between them.
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