A Flexible and High-Precision Perpendicularity Measurement Method of Multiaxis Turntables Based on Single-Axis Laser Gyro Goniometer

This paper gives a new application of laser gyro in the field of metrology, that is, the perpendicularity measurement method between two axes of multi-axis turntables based on single-axis laser gyro goniometer. This method skillfully establishes different coordinate frames on the turntable and uses the projection variation of the sensitive axis of the laser gyro in the coordinate frame to solve the perpendicularity. This method can also accurately solve the misalignment angle of the laser gyro goniometer at the same time. It is suitable for online measurement of perpendicularity between the axes of multi-axis turntables in fields such as CNC machine tools, robots, flight simulation, and inertial testing. This method has simple equipment installation, convenient measurement operation, high measurement accuracy (the measurement uncertainty is <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">U</i> = 0.23′′ (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</i> = 2), and fully utilizes the dynamic characteristics of the laser gyro goniometer.