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压电陶瓷组成的功率超声复合振子,虽然有不少优点,但是在实际负载中,有时声负载匹配不够理想,声能不易辐射出去。如果压电片的位置放的不妥当,其声能就更辐射不出去,增加了换能器的损耗,降低了电声效率。本文从振子的晶片位置上研究了这个问题。 一、引言 关于复合振子的压电片位置,有人曾作过研究。例如:Shoh研究了压电片位置对振子内部功率损耗的影响。Lemaser在频率为10kHz下,研究了压电片的位置对阻抗、Q值和辐射端头位移的影响。汪承灏研究了压电片的位置对有效耦合系数的影响。我们根据压电片在振子中的位置不同,设计了多种20kHz的压电陶瓷复合振子。在超声工程常用的功率和位移振幅下,分两种情况试验:第一情况,向空气中辐射;第二种情况向水中辐射。通过这些实验,从压电陶瓷片在振子中的不同位置,观察它们的内部损耗功率和电声效率的变化。
Piezoelectric ceramic power ultrasonic composite oscillator, although there are many advantages, but in the actual load, sometimes the sound load matching is not ideal, the sound can not be easily radiated. If the location of the piezoelectric film is not put properly, the sound energy is more radiation can not go out, increasing the loss of the transducer, reducing the electro-acoustic efficiency. This article from the oscillator position of the wafer to study this issue. First, the introduction About the piezoelectric element of the composite oscillator position, it has been studied. For example, Shoh investigated the effect of the piezoelectric patch position on the internal power loss of the transducer. Lemaser studied the effect of the position of the piezoelectric patch on the impedance, the Q value and the tip displacement at a frequency of 10 kHz. Wang Chenghao studied the piezoelectric film position on the effective coupling coefficient. According to the different positions of the piezoelectric elements in the vibrator, we designed a variety of 20kHz piezoelectric ceramic composite oscillator. In ultrasonic engineering commonly used power and displacement amplitude, the test is divided into two situations: the first case of radiation to the air; the second case of radiation to the water. Through these experiments, the changes of their internal loss power and electroacoustic efficiency were observed from different positions of the piezoelectric ceramics in the vibrator.