Improved Ultrasonic Piezoceramic Sandwich Transducer

This paper presents an improved ultrasonic piezoceramic sandwich transducer, utilised for ultrasonic field in narrow lift stations, wet well, flumes and filter beds. The piezoceramic sandwich transducer powered by a signal generator and it is suitable to generate ultrasound with two piezoceramics and the exponential horn at 35 kHz resonance frequency. From the experiments it can be proved that the ultrasonic piezoceramic transducer acoustical power and vibration amplitude mainly depends on the piezoceramic tores and the ratio between the diameter of the horn ends and material elasticity coefficient. The advantage of the exponential horn is that the beam angle is narrower which is suitable for narrow lift stations measurement. The piezoceramic sandwich transducer and the air-coupled transducer are modeled in order to optimize output with material physical parameter changing. The simulation results show good agreement with experiments and based on the numerically modeling trials, more robust design would become true without extensive cutting or trying prototype. The polar pattern results in lab are prominent.