Measuring and testing – Moisture content or absorption characteristic of material
Reexamination Certificate
2007-02-06
2007-02-06
Chapman, John E. (Department: 2856)
Measuring and testing
Moisture content or absorption characteristic of material
C073S580000, C073S061750, C374S027000
Reexamination Certificate
active
11352610
ABSTRACT:
An apparatus for measuring the mass of a substance includes a sensor having a membrane layer, the membrane for receiving the substance thereon, an oscillator device for driving the membrane at a reference resonant frequency, a frequency detection device for determining a change in the reference resonant frequency caused by the presence of the substance on the membrane, and a mass determining device for determining the mass of the substance, the change in the reference resonant frequency being indicative of the mass of the substance.
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Brian Stark, “Common Device Elements” inMEMS Reliability Assurance Guidelines for Space Applications, Chapter 6, JPL Publication 99-1, Jan. 1999, pp. 91-151.
Cunningham Brian T.
Williams John R.
Chapman John E.
Iandiorio & Teska
The Charles Stark Draper Laboratory Inc.
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