Measuring and testing – Gas analysis
Reexamination Certificate
2008-09-23
2008-09-23
Williams, Hezron (Department: 2856)
Measuring and testing
Gas analysis
C073S031050
Reexamination Certificate
active
11203576
ABSTRACT:
A method and system for estimating one, two or more unknown components in a gas. A first array of spaced apart carbon nanotubes (“CNTs”) is connected to a variable pulse voltage source at a first end of at least one of the CNTs. A second end of the at least one CNT is provided with a relatively sharp tip and is located at a distance within a selected range of a constant voltage plate. A sequence of voltage pulses {V(tn)}nat times t=tn(n=1, . . . , N1;N1≧3) is applied to the at least one CNT, and a pulse discharge breakdown threshold voltage is estimated for one or more gas components, from an analysis of a curve I(tn) for current or a curve e(tn) for electric charge transported from the at least one CNT to the constant voltage plate. Each estimated pulse discharge breakdown threshold voltage is compared with known threshold voltages for candidate gas components to estimate whether at least one candidate gas component is present in the gas. The procedure can be repeated at higher pulse voltages to estimate a pulse discharge breakdown threshold voltage for a second component present in the gas.
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Li Jing
Meyyappan Meyya
Frank Rodney
Padilla Robert M.
Schipper John F.
United States of America as Represented by the Administrator of
Williams Hezron
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