Abstract
A simple, passive, single-element ultrasonic transducer is proposed for non-invasive measurements. Operating the transducer at different resonant modes allows the adaptation of the emitted sound pattern to various requirements. The emitted sound field is simulated and experimentally characterized. We demonstrate the suitability of the transducer prototype for non-invasive continuous level measurement in laboratory as well as field environment over an extended level- and temperature range. The measured performance fulfils typical requirements for invasive level sensors. The versatility of the transducer enables its application in a wide range of non-invasive measurements.
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