Acoustic analysis of gas mixtures

摘要

An acoustic gas analyser (2) comprises an acoustic velocity meter (18) arranged to provide a first output dependent on a detected transmission of acoustic energy through a gas to be analysed; a temperature probe (22) having a probe time constant and arranged to provide a second output indicative of a measured temperature of the gas; and a calculations unit (20) configured to receive the first and the second outputs and to determine compositional information of the gas therefrom. A signal processor (30) is connected between the acoustic velocity meter 18 and the calculations unit 20 and is configured to temporally adapt the amplitude of the first output from the meter 18 in a manner dependent on the probe time constant and to provide a temporally adapted first output for use as the first output within the calculations unit (20).