A low cost force sensing crystal resonator applied to weighing

Author

Albert, William C.

Author_Institution

Crystal Gage Inc., Franklin Lakes, NJ, USA

fYear

1988

Firstpage

78

Lastpage

84

Abstract

A general-purpose, force-sensing crystal resonator has been developed that is low in cost. The very simple design uses the single-vibrating-beam approach and includes a dynamic isolator system at each end to maintain high Q. The beam is a rotated X-cut which exhibits a high turnover temperature (up to 38°C) and performs very well in atmosphere as well as vacuum. Typical bias frequencies are from 20 to 26 kHz, depending on beam geometry, and they are capable of changing frequency typically ±10% in response to 700-gm axial tension or compression forces, respectively. Weighing to an accuracy of better than one part in 20000 has already been demonstrated, and indications are that one part in 40000 or better is feasible

Keywords

crystal resonators; electric sensing devices; force measurement; quartz; transducers; weighing; 20 to 26 kHz; 38 C; SiO₂; axial forces; beam geometry; bias frequencies; compression forces; dynamic isolator system; force dependent frequency; force sensing crystal resonator; high Q; high turnover temperature; low cost; performs in air; rotated X-cut; simple design; single-vibrating-beam; tension forces; weighing; weighing accuracy; Boundary conditions; Costs; Differential equations; Frequency; Geometry; Isolators; Lakes; Nonlinear equations; Temperature sensors; Tensile stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 1988., Proceedings of the 42nd Annual

Conference_Location

Baltimore, MD

Type

conf

DOI

10.1109/FREQ.1988.27583

Filename

27583