Development of a Dual-axis Optoelectronic Precision Level

摘要

This paper presents the design principle and applications of a innovative dual-axis optoelectronic level. A commercially available DVD pickup head is adopted as the angle sensor in association with the double-layer pendulum mechanism for dual-axis swings. A mass-damping system is analyzed to model the mechanical dynamics. Measured angles of both axes are processed by a microprocessor and displayed on a LCD or exported to an external PC. Compared with a triple-beam laser angular interferometer, the error of the dual-axis optoelectronic level is better than ±0.5 arc-seconds in the measuring range of ±20 arc-seconds, and the settling time is within 0.5 sec. Two experimental results show the consistency with a Renishaw interfereometer and its practical use in industry.