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US 5,869,763 AGranted
Method for measuring mass change using a quartz crystal microbalance
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsJohn R. Vig, Raymond L. Filler
Life of this patent
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Abstract
A quartz crystal resonator is excited in two different modes at the same time such that the mass change and the temperature change can be measured independently. In using such a quartz crystal the change in mass can be calculated accurately and in real time, independent of temperature effects.
Claims9
A crystal microbalance comprising:
- a crystal having a cut and rotation such that the crystal can be excited in two different modes simultaneously;
- means to apply a first and second frequencies to the crystal wherein the first frequency is temperature sensitive and the second other frequency is mass sensitive;
- and
- means to calculate a mass applied to the crystal from a combination of the first and second frequencies.
1 more element
Dependencies are inferred from the claim text.