scholarly journals Study on elastic-wall fluid cavity resonant frequency of Helmholtz underwater acoustic transducer

2016 ◽  
Vol 65 (2) ◽  
pp. 024301
Author(s):  
Sang Yong-Jie ◽  
Lan Yu ◽  
Ding Yue-Wen
Keyword(s):  
Resonant Frequency ◽  
Underwater Acoustic ◽  
Acoustic Transducer ◽  
Elastic Wall

Analyzing Resonant Frequency of 1-3-2 Piezoelectric Composite with Multi-Mode

2013 ◽  
Vol 275-277 ◽  
pp. 1593-1596
Author(s):  
Da Ke Cai ◽  
Li Kun Wang ◽  
Lei Qin ◽  
Yu Lu ◽  
Jing Jing Zhou
Keyword(s):  
Numerical Calculation ◽  
Resonant Frequency ◽  
Theoretical Basis ◽  
Piezoelectric Composite ◽  
Parallel Model ◽  
Cutting Depth ◽  
Theoretical Derivation ◽  
Underwater Acoustic ◽  
Acoustic Transducer ◽  
Multi Mode

1-3-2 piezoelectric composite has been widely used in the field of underwater acoustic transducer. In this paper, Series-parallel model is used to make the theoretical derivation of the resonant frequency of 1-3-2 piezoelectric composite. By using numerical calculation the law of the frequency varying with the cutting depth is gained. It provides theoretical basis for the design of the 1-3-2 piezoelectric composite with multi-mode.

scholarly journals Piezoelectric MEMS Acoustic Transducer with Electrically-Tunable Resonant Frequency

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 96
Author(s):  
Alessandro Nastro ◽  
Marco Ferrari ◽  
Libor Rufer ◽  
Skandar Basrour ◽  
Vittorio Ferrari
Keyword(s):  
Acoustic Emission ◽  
Resonant Frequency ◽  
Piezoelectric Layer ◽  
Flexural Mode ◽  
Resonant Frequencies ◽  
Voltage Mode ◽  
Acoustic Transducer ◽  
Aln Film ◽  
Doped Silicon ◽  
Piezoelectric Mems

The paper presents a technique to obtain an electrically-tunable matching between the series and parallel resonant frequencies of a piezoelectric MEMS acoustic transducer to increase the effectiveness of acoustic emission/detection in voltage-mode driving and sensing. The piezoelectric MEMS transducer has been fabricated using the PiezoMUMPs technology, and it operates in a plate flexural mode exploiting a 6 × 6 mm doped silicon diaphragm with an aluminum nitride (AlN) piezoelectric layer deposited on top. The piezoelectric layer can be actuated by means of electrodes placed at the edges of the diaphragm above the AlN film. By applying an adjustable bias voltage Vb between two properly-connected electrodes and the doped silicon, the d31 mode in the AlN film has been exploited to electrically induce a planar static compressive or tensile stress in the diaphragm, depending on the sign of Vb, thus shifting its resonant frequency. The working principle has been first validated through an eigenfrequency analysis with an electrically induced prestress by means of 3D finite element modelling in COMSOL Multiphysics®. The first flexural mode of the unstressed diaphragm results at around 5.1 kHz. Then, the piezoelectric MEMS transducer has been experimentally tested in both receiver and transmitter modes. Experimental results have shown that the resonance can be electrically tuned in the range Vb = ±8 V with estimated tuning sensitivities of 8.7 ± 0.5 Hz/V and 7.8 ± 0.9 Hz/V in transmitter and receiver modes, respectively. A matching of the series and parallel resonant frequencies has been experimentally demonstrated in voltage-mode driving and sensing by applying Vb = 0 in transmission and Vb = −1.9 V in receiving, respectively, thereby obtaining the optimal acoustic emission and detection effectiveness at the same operating frequency.

Development of Automated Measurement Setup for Characterizing Underwater Acoustic Transducers

2016 ◽  
Vol 50 (6) ◽  
pp. 69-75
Author(s):  
Amirthalingam Malarkodi ◽  
Peddinti SSR Sridhar ◽  
Ganesan Latha
Keyword(s):  
Accurate Determination ◽  
Motion Controller ◽  
Report Generation ◽  
Underwater Acoustic ◽  
Acoustic Transducers ◽  
Acoustic Transducer ◽  
Measurement Results ◽  
Computer Based ◽  
Calibration Program

AbstractAccurate determination of sensitivity and directivity is important for any underwater acoustic transducer. In this work, an automatic measuring platform was designed and implemented for characterizing underwater acoustic transducers. The overall hardware setup includes a PXI (PCI Extensions for Instrumentation)-based data acquisition system, computer-based controller module, motion controller module, and LabVIEW-based automatic calibration program. The system performs a sequence of operations automatically and achieves synchronous control of transmission and acquisition of real-time acoustic signals as well as processing, recording, and report generation. This measurement platform can be utilized for characterizing any type of acoustic transducer for its receiving sensitivity, transmitting response, and directivity measurement as per IEC60565 standard. The measurement results for RESON TC4034 and RESON TC 2080 transducers are presented and the results show that the system is able to carry out accurate calibration and characterization of any underwater acoustic transducer. Sources of uncertainty for calibration are also presented with the confidence level of approximately 95%.

HIGH POWER, MOTOR DRIVEN UNDERWATER ACOUSTIC TRANSDUCER

2012 ◽  
Vol 132 (2) ◽  
pp. 1234
Author(s):  
Kenneth R. Erikson ◽  
Eric M. Will
Keyword(s):  
High Power ◽  
Underwater Acoustic ◽  
Acoustic Transducer
Sign in / Sign up

Export Citation Format

Share Document