Spurious mode map for DETF force transducer

Details Spurious mode map for DETF force transducer Spurious mode map for DETF force transducer

1996-07-03

1997-09-16

Biegel, Ronald L.

Measuring and testing

Dynamometers

Responsive to force

G01L 100

Patent

active

056683294

ABSTRACT:
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.

REFERENCES:
patent: 4372173 (1983-02-01), EerNisse et al.
patent: 4535638 (1985-08-01), EerNisse et al.
patent: 4665748 (1987-05-01), Peters
patent: 4724351 (1988-02-01), EerNisse et al.
patent: 4901580 (1990-02-01), Blake et al.
patent: 4912990 (1990-04-01), Norling
patent: 5095763 (1992-03-01), Delatorre
Paper on Finite-Element Analysis of A Quartz Digital Accelerometer by E.D. Reedy, Jr. and W.J. Kass/Ultrasonics Ferroelectrics, and Frequency Control, vol. 37, No. 5, Sep., 1990; 11 pages.

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