Views: 1 Author: Site Editor Publish Time: 2018-08-25 Origin: Site
The ultrasonic transducers is bonded with two symmetrical metal shells and piezoelectric ceramic discs are polarized in the thickness direction with super glue to form a metal-ceramic composite type, its working mechanism is transforming for the high-impedance,small-radial expansion and contraction displacement of the piezo ceramic wafer into a low-impedance and large-bending deformation of the thin metal shell, thereby generating a large amplitude displacement perpendicular to the top of the thin metal shell. The Cymbal transducer was originally designed to use a micro-displacement drive device that provides a relatively large mechanically-stretched piezoelectric ceramic disc. The displacement of the metal piezo ceramic composite transducer and the moderate driving force fill the gap between the micro-displacement device between the bimorph structure and the multilayer wafer structure. Later, some scholars suggested using the transducer as a hydroacoustic receiver and grouping multiple. Cymbal transducer elements of small size is a properly space array to enhance the sound source and directivity of the transducer.
Theoretical analysis and experiments show that the cymbal transducer has lower electromechanical energy conversion efficiency than the dual crystal oscillator under the conditions of the same size, operating frequency and power consumption is higher than other types of piezoelectric vibrators. Cymbal ultrasonic distance sensors operate at low frequencies and are highly sensitive, small, lightweight, and easy to form an array structure.
The dual resonant frequency of distance transducer sensor circuit also introduces the fabrication method of the dual resonant frequency cymbal transducer. Experiments have shown that the use of asymmetric metal shells to form a cymbal transducer produces two different resonant frequencies in the 16-50 kHz range. The broadband ultrasonic transducer can be fabricated by appropriately selecting the material and structural dimensions of the metal shell so that the two resonance peaks of the cymbal transducer are close together. If a plurality of asymmetric cymbal transducers are staggered, both the bandwidth of the cymbal transducer array and its pointing gain can be increased.
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