Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Reexamination Certificate
2007-10-16
2007-10-16
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
C073S053010, C073S049200
Reexamination Certificate
active
11088436
ABSTRACT:
The present invention comprises a noncontact method for measuring viscosity and/or surface tension information of a liquid in a liquid containment structure. The steps of the method include exciting a surface of the liquid with an excitation burst of acoustic energy that causes the surface to oscillate; generating a positional data set comprised of a plurality of positional measurements related to the detected position of the surface at a plurality of times after the surface is excited; generating a frequency domain data set from the positional data set, the amplitude spectrum of the frequency domain data set comprising information about the oscillation frequency of at least one vibrational mode of the of the surface as it oscillates; and processing the frequency domain data set and/or the positional data set to yield information about the surface tension and/or viscosity of the liquid. A Fast Fourier Transform technique may be used in generating the frequency domain data set.
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patent: 6563588 (2003-05-01), Behroozi
patent: 6596239 (2003-07-01), Williams et al.
patent: WO/0136959 (2001-05-01), None
U.S. Appl. No. 10/290,626, filed Nov. 7, 2002, Williams et al.
Vibrational Modes of a Circular Membrane—(DRUMS!), http:/kettering.edu/˜drussell/Demos/MembraneCircle/Circle, pp. 1-3, printed from web site Feb. 4, 2005.
MATLAB Signal Processing Toolbox, The Math Works, Inc., pp. 6-115 thru 6-118, 6-166 (Dec. 1996).
Chiao James
Chow Humphrey W.
Forbush Michael J.
Rose Andrew M.
Williams Roger O.
EDC Biosystems, Inc.
Frank Rodney
Pagel Donald J.
Williams Hezron
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