Measuring and testing – Gas analysis – By vibration
Patent
1989-10-06
1992-07-14
Williams, Hezron E.
Measuring and testing
Gas analysis
By vibration
G01N 2902
Patent
active
051292556
ABSTRACT:
An electronic system for detecting and tracking the resonant frequency of a photoacoustic cell is described. The system includes and makes use of inherent signal acquisition properties. The detection and tracking circuitry promotes acoustic oscillation at the cell resonant frequency while the amplitude of the acoustic oscillation is automatically controlled at a specific reference level. Under normal operation, a change in system oscillation amplitude with respect to the reference level is considered to be the result of additional acoustic excitation other than that provided by the electronic system. Changes in the oscillation amplitude, as compared to a reference level, produce an error signal which is directly related to the additional acoustic excitation. The system is particularly useful in measuring gaseous phase materials over a wide dynamic range of concentrations.
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Burke William J.
Roskos Joseph W.
The Aerospace Corporation
Williams Hezron E.
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