Method and apparatus for detecting hydrogen, oxygen and water vapor concentrations in a host gas
Apparatus and methods for measuring fluid flow parameters
System for determining gas concentration
ApplicationNo. 369104 filed on 06/21/1989
US Classes:73/24.01, By vibration73/61.49, By vibration73/597, Velocity or propagation time measurement340/632Gas
ExaminersPrimary: Tokar, Michael
Assistant: Roskos, Joseph W.
Attorney, Agent or Firm
Foreign Patent References
International ClassG01N 029/18
AbstractA method and apparatus for fluid mixture monitoring and controlling using an acoustic sensing technique by pulsing a fluid sample and a reference fluid in elongated chambers with sound waves generated at one end of the chambers and sensing the resonant frequencies in the chambers, or the time lapse for the sound waves to traverse the chambers, with transducers disposed proximate the other ends of the chambers and ratiometrically comparing the time-based measurements.