Class IV Flextensional Transducer with a reflector |
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| Authors: | KPB Moosad G Chandrashekar MJ Joseph Reji John |
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| Institution: | 1. Science and Engineering Faculty and Institute of Health & Biomedical Innovation, Queensland University of Technology, Brisbane, Australia;2. ARC Centre of Excellence for Advanced Molecular Imaging, La Trobe Institute for Molecular Sciences, La Trobe University, Bundoora, Australia;3. Laboratory of Ultrasonic Electronics, Doshisha University, Kyotanabe, Japan;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Yudao 29, Nanjing 210016, People''s Republic of China;2. Institute of Dynamics and Vibration Research, Leibniz University Hannover, Appelstraße 11, Hannover 30167, Germany;1. Department of Physics, China Jiliang University, Hangzhou 310018, China;2. College of Mathematics, Physics & Information Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, China |
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| Abstract: | Class IV Flextensional Transducers (FTs), which are the most popular among the various FTs used for underwater sound projection, are inherently omni-directional and therefore their possible application areas are limited. In this work, we investigate the possibility of getting directional performance from a 3 kHz Class IV FT, using a reflector. Finite element modeling (FEM), with the help of a commercially available package ATILA, has been made use of. Results indicate that a parabolic reflector with a air–water interface as the reflecting surface, would give an excellent directivity of 60° (3 dB) with a front-to-back ratio better than 30 dB. Experimental results, making use of a sound-reflecting coating as the reflector has shown a directivity of 82°, with a front-to-back ratio of 21 dB. It is also observed that the reflector causes the FTs to vibrate in asymmetrical modes, the long-term implications of which needs to be studied to ensure the reliability of the device. |
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