A Magnetic Induction-Based Highly Dynamic Rotational Angular Rate Measurement Method

A magnetic induction-based angular rate measurement method is proposed to address the need for internal measurement of high-speed angular rate of carriers. This method relies on the rotational periodicity fed back by the magnetic field. Three coils aligned orthogonal one to another are employed as the feedback module that supplies the rotational periodicity information, the physical characteristic that contains the periodic signals, which in turn reflect the highly dynamic rotation of the carrier in its accelerating process. The periodic, instantaneous start point is extracted from the magnetic signal using zero-phase threshold technique, whereby the signal periodicity is established, enabling experimental measurement of the rotational angular rate of a high-speed rotation object. A semi-physical simulation was conducted at different speeds using a low maximum speed high-precision rotary table, and the results demonstrate that this measurement method is capable of measuring angular rate varying dynamically between 1 and 100 r/s, with a measurement error within 2⁰/₀₀ of the full scale. This method also provides a means for evaluating angular rate of other types of rotational movement.