Patent ID: 7784327
Filing Date: 2010-08-31
Classification: G01N

Abstract:
1. A method of dimensioning a measurement apparatus for determining the proportion of gases in a gas mixture by means of ultrasound detection, comprising the steps of: determining a maximum allowable error in the determined proportion of a gas in the gas mixture; estimating the magnitude of maximum occurring pressure variation in the gas mixture; calculating the magnitude of maximum occurring temperature variation in the gas mixture dependent on the estimated magnitude of occurring pressure variation in the gas mixture; calculating a maximum allowable time lag for thermal exchange between the gas mixture and the measurement apparatus dependent on the maximum allowable error in the determined proportion of a gas in the gas mixture and the magnitude of occurring temperature variations in the gas mixture; adapting the measurement apparatus such that the time lag for thermal exchange between the gas mixture and the measurement apparatus is less than or equal to (≦) the calculated maximum allowable time lag for thermal exchange.