A New Period Measurement Method Based on Phase-sensitive Detection for Beam Balance Oscillator

The oscillation period of a beam balance oscillator is influenced by the ground vibrations via the displacements of the central pivot. In this paper, an analytical solution for the kinetic equation of the balance beam is deduced when periodic horizontal vibrations are considered. A new method based on phase-sensitive detection technique is proposed to improve the accuracy of oscillation period determination. Simulation results indicate that the proposed approach has a much better anti-disturbance capability than the general one.