Contactless Measurement of Angular Velocity using Circularly Polarized Antennas

TitleContactless Measurement of Angular Velocity using Circularly Polarized Antennas
Publication TypeJournal Article
Year of Publication2014
AuthorsSipal, V, Narbudowicz, A, Ammann, MJ
Journal TitleIEEE Sensors Journal
Journal Date12/2014

An innovative method to measure angular velocity using circularly-polarized antennas is proposed. Due to the properties of circular polarization, the angular velocity is frequency modulated (FM) on a wireless carrier. This enables a low-cost precise continuous measurement of angular velocity using a standard FM demodulator. The hardware can be easily adapted for both high and low angular velocity values. The precise alignment angle between the antennas can be determined if the initial antenna orientation is known. The angular error is shown to be less than 1.5° for antennas with a 1 dB axial-ratio. The basic method is applicable for a fixed distance between the antennas. Therefore, an advanced method which provides data for variable distances is also presented.

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