Measuring and testing – Gas analysis – By vibration
Patent
1997-11-12
2000-12-19
Williams, Hezron
Measuring and testing
Gas analysis
By vibration
73 2321, 73579, 73658, H03K 1314, G01R 2302, G01R 2314, H03M 110
Patent
active
061614203
ABSTRACT:
An electrical circuit and method for measuring small variations in a high frequency signal is disclosed. The circuit generates a coarse measurement of the input signal frequency and a reference signal having the same frequency as the frequency represented by the coarse measurement. The circuit measures the difference in frequency between the input signal and the reference signal, and adds the coarse measurement and the difference measurement to determine the frequency of the input signal. The circuit may be used in conjunction with a piezoelectric acoustic wave device and oscillator to provide an apparatus for accurately measuring low concentrations of a gas.
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Dielschneider Nile K.
Dilger John P.
Fisher Controls International Inc.
Wiggins David J.
Williams Hezron
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