| 摘要 |
<p>The invention relates to an acoustic flowmeter for the non-invasive determination of the flow or flow rate in electrically conductive objects through which media flow, in particular tubes or pipelines, having a transmitting converter for generating at least one ultrasonic wave in the object, which wave is coupled into the medium as a longitudinal wave on an inner side of the object directed toward the medium, and having a receiving converter for detecting an ultrasonic signal in the object, wherein the ultrasonic signal results at least partly from the longitudinal wave, wherein the transmitting converter is formed as a high-frequency induction coil dispensing with acoustic coupling of the transmitting converter to the surface of the object, for generating a varying magnetic field in a region close to the surface of the in particular metallic object, and the ultrasonic wave is generated as a result of interaction of the varying magnetic field with a static or quasi-static magnetic field in said region.</p> |
