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Method for the measurement of the molar mass of gases or gas mixtures and an apparatus for the performance of the method

  • US 5,645,071 A
  • Filed: 04/12/1995
  • Issued: 07/08/1997
  • Est. Priority Date: 06/04/1993
  • Status: Expired due to Term
First Claim
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1. A method of measuring a molar mass of a gas or gas mixture, comprising:

  • flowing the gas or gas mixture through a holder on which one or more sonic or ultrasonic transmit and receive cells are arranged to define a baseline,wherein the sonic or ultrasonic transmit-receive cells radiate a pulsed sonic signal,measuring transit times of sonic pulses of the sonic signal along the baseline,performing temperature compensation measurements, anddetermining the molar mass from the transit times of the pulses of the sonic signal and the temperature compensation measurements,wherein the molar mass M is determined using the equation;

    ##EQU3## wherein k1 is a dimension-related constant, kA is a dimensionless constant for adiabatic exponent correction, T is a mean temperature along the baseline, and t1 and t2 represent transit times along the baseline reduced by time used for assembly and measurement.

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