Abstract
Orientation measurement is an important topic for spherical actuators. The purpose of this study is to propose a high-precision non-contact displacement measurement method for 3-DOF rotational motions. The operating principle of the measurement method is based on the non-contact laser detection. It has several advantages compared with other orientation measurement methods. The non-contact property avoids friction and additional mass/inertia moment exerted on the moving part that may significantly reduce the system working efficiency. Compared with other non-contact measurement methods, it can achieve a high-precision measurement result, and its performance is not affected by environmental field. The algorithm for three rotation angles has been derived. Two experimental apparatus have been developed to conduct measurements, and to evaluate the proposed orientation measurement method.
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