Multi-resonant broadband Janus-Ring transducer
SUN Shuzhen; LI Junbao;
Institute of Acoustics, Chinese Academy of Sciences; University of
Chinese Academy of Sciences; Beijing Greatwall Electronic Equipment
A Janus-Ring (JR) transducer with two piezoelectric rings placed
around a Janus driver is presented. The rings have radial vibration,
whereas the Janus has longitudinal vibration, and a resonance of
Helmholtz cavity is observed between them. By joining the three
resonances, the working frequency bandwidth of the transducer is
prominently widened. After simulation using finite element method, a
prototype is finally fabricated and tested. Results show that in the
working frequency of 1.8 to 8.0 kHz, the maximum transmitting voltage
response (TVR) is 144 dB, and the fluctuations are less than 6 dB.
Compared with traditional Janus-Helmholtz transducers, the JR
transducer has the characteristics of wider bandwidth, greater TVR,
and less fluctuations of TVR in working frequency band.