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The transducer used for a micro-displacement driving device

Views: 1     Author: Site Editor     Publish Time: 2018-08-25      Origin: Site

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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.


From the perspective of the structure of the transducer and the form of electromechanical energy conversion, the on-board ultrasonic distance measurement sensor should have the following features or functions: 1 compact structure and easy installation; 2 suitable for field work; 3 allow the operating frequency to be designed in a lower frequency band, In order to reduce the absorption of energy during the propagation of sound waves, 4.which has a larger radiation surface, so that the transducer has good directivity. As can be seen from the foregoing discussion of various forms of transducers, radial and thickness-causing piezoelectric disk transducers have both of the above characteristics. In addition, considering the doppler shift problem and the narrow band problem of the distance measuring transducer sensor in the air medium, the compact structure inherent in the cymbal transducer can be utilized to form an ultrasonic receiver array that is small size, light in weight, and frequency bandwidth. This paper comprehensively considers the above two factors, and puts forward the design idea of using the disk transducer as the main transducer and Cymbal as the auxiliary receiving transducer" to form a combined ultrasonic probe, which has a large working distance and good directivity. , frequency bandwidth, small size, light weight, on-board ultrasonic distance measuring sensor.


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