| 摘要 |
A double-ended tuning fork (DETF) is formed from two vibrating beams joined together at each end, having a thickness t, a width w, a length L and a vibrating beam length m. The dimensional ratios t/w and L/m for the DETF are selected according to a relatively more accurate spurious mode map based upon detailed finite element calculations at specific dimensional ratios for t/w and L/m. The results of the finite element analysis is fit by way of a lease-squared polynomial over the entire dimensional range of interest. The results of the finite element analysis for the spurious modes provides differences of up to fourteen percent (14%) relative to the spurious mode map based on simple beam theory. In addition, the spurious mode map in accordance with the present invention accounts for the use of symmetric outriggers in the base region of the DETF which increases the mechanical Q of the DETF.
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