Accelerometric and Magnetic Sensitivities of BVA Resonators (SensibilitesAccelerometrique et Magnetique des Resonateurs BVA)

摘要

The accelerometric and magnetic sensitivities of a quartz resonator are commonlyattributed to the design of the resonator, for the main part. Since a few years, it is well-known that G-sensitivity can reach zero if the geometry of the structure (including blank geometry, orientation of the mounting, number of supports,...) leads to the perfect symmetry around the three axes. In this paper, the authors show that the BVA resonator has been well designed to exhibit a very low G-sensitivity. Furthermore, by finite element analysis, the authors have quantified the influence of some symmetry defects due to manufacturing process (as orientation of the mounting, shift between the vibration area center and the blank center,...) on the accelerometric sensitivity.