Measuring and testing – Gas analysis – By vibration
Patent
1977-11-25
1979-08-21
Gill, James J.
Measuring and testing
Gas analysis
By vibration
G01N 2518
Patent
active
041648625
ABSTRACT:
Apparatus for measurement of gases in a multiple component gas stream or sample is disclosed. A regulated pressure system delivers the gas to N thermal conductivity type detectors utilizing wheatstone bridges. The thermal conductivity detector utilizes a resistance heated element (one leg of the bridge) which heats a chamber, and the sample flow varies the heat by thermal conduction in the chamber. The circuit creates a feedback signal for purposes of stabilizing the temperature in the chamber at a specified level. As the feedback signal is varied as a result of the change in concentration in the sample flow, this change in feedback signal is a signal which is related to the input. The apparatus utilizes N wheatstone bridges and feedback circuits for a sample gas having N constituents which are operated at N distinct temperatures relative to one another, and the respective output signals from the N detector circuits have the form of N simultaneous equations to form an output signal indicative of the gas makeup of the N gases in the sample.
REFERENCES:
patent: 3429178 (1969-02-01), Durbin
patent: 3603147 (1971-09-01), Dorman
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