Patent ID: 7647826
Filing Date: 2010-01-19
Classification: G01N

Abstract:
1. A method for measuring at least one parameter selected from the group consisting of operational density and operational sound velocity in a gaseous medium, using a sound transducer that is capable of vibrating, and which is disposed in a housing so that chambers having the same volume and filled by the gaseous medium are formed on both sides of the sound transducer, the chambers being connected with one another by way of an open channel having defined dimensions, the method comprising the following steps: applying an exciter vibration to the sound transducer; determining impedance of the sound transducer, which is influenced by density of the gaseous medium, as a function of frequency, within an established frequency range; and determining the at least one parameter of the gaseous medium using a plurality of characteristic frequencies of the sound transducer vibrating in the gaseous medium.