Measuring and testing – Gas analysis – By vibration
Reexamination Certificate
2008-01-08
2008-01-08
Williams, Hezron (Department: 2856)
Measuring and testing
Gas analysis
By vibration
C073S024020
Reexamination Certificate
active
11412212
ABSTRACT:
An apparatus for BTU measurement of natural gas having at least one reference spherical acoustic resonator containing a reference gas, a sample gas spherical acoustic resonator containing a natural gas sample, a first acoustic transmitter adapted to transmit a first acoustic signal into the natural gas sample, a second acoustic transmitter adapted to transmit a second acoustic signal into the reference gas, a first acoustic receiver adapted to receive at least a portion of the first acoustic signal, and a second acoustic receiver adapted to receive at least a portion of the second acoustic signal. Using the third radial resonance frequencies for the sample gas and reference gas, a data processor operably connected with a signal output of the first acoustic receiver determines the specific gravity of the natural gas sample. The discovered linear relationship between specific gravity and heating value of natural gas enables a determination of the heating value from the measured specific gravity.
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Web document: Hazelden et al., “Development and Deployment of an acoustic resonance technoogy for energy content measurement,” http://research.nigc.ir/files/WGC/paper/add10666.pdf, 9 pages.
Liss, W.E. et al., “Variability of Natural Gas Composition in Select Major Metropolitan Areas of the United States”, Gas Research Institute, Mar. 1992.
Fejer Mark E.
Fitzgerald John
Gas Technology Institute
Williams Hezron
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