ACOUSTIC METHOD FOR MEASURING PROPERTIES OF A MOBILE MEDIUM

摘要

The invention relates to a method for measuring parameters and/or13roperties in a mobile medium, e.g. a liquid or a gas. If acoustic energy is transmitted into a mobile medium, flow is initiated in the medium. This flow is measured by any known method, and this provides information on the properties of the medium. If the medium contains bodies which reflect acoustic and/or optical signals, ultrasound or laser-Doppler can be used for measuring the velocity of the bodies. The Doppler-shifted signal can provide information on the viscosity of the medium and on the bodies in the medium.