Micromechanical oscillating mass balance

Details Micromechanical oscillating mass balance Micromechanical oscillating mass balance

1995-12-12

1997-11-04

Gellner, Michael L.

Weighing scales

Self-positioning

Electrical current generating or modifying

G01G 314

Patent

active

056842767

ABSTRACT:
A micromechanical oscillating mass balance and method adapted for measuring minute quantities of material deposited at a selected location, such as during a vapor deposition process. The invention comprises a vibratory composite beam which includes a dielectric layer sandwiched between two conductive layers. The beam is positioned in a magnetic field. An alternating current passes through one conductive layers, the beam oscillates, inducing an output current in the second conductive layer, which is analyzed to determine the resonant frequency of the beam. As material is deposited on the beam, the mass of the beam increases and the resonant frequency of the beam shifts, and the mass added is determined.

REFERENCES:
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patent: 4294105 (1981-10-01), Kelly
patent: 4418774 (1983-12-01), Whitney et al.
patent: 4429574 (1984-02-01), Barry et al.
patent: 4618014 (1986-10-01), Kobayashi
"Process of Creep and Fatigue in Metals" (1962). A. J. Kennedy.
"Resonant-Microbridge Vapor Sensor," Roger T. Howe & Richard S. Muller, IEEE Transactions on Electron Devices, vol. ED-33, #4, pp. 499-506, Apr. 1986.

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