NDLI: Development of broadband transducer using multilayer piezoelectric elements

Content Provider	IEEE Xplore Digital Library
Author	Amakasu, K. Mishima, Y. Sawada, K. Mukai, T. Sasakura, T.
Copyright Year	2011
Description	Author affiliation: Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan (Amakasu, K.; Mishima, Y.) \|\| National Research Institute of Fisheries Engineering, Fisheries Research Agency (Sawada, K.) \|\| Faculty of Fisheries Sciences, Hokkaido University (Mukai, T.) \|\| Fusion Inc (Sasakura, T.)
Abstract	A Langevin-type broadband transducer was developed using a multilayer piezoelectric actuator (hereafter referred to as a multilayer piezoelectric element). The frequency range of the broadband transducer was aimed to cover the frequency range from 38 to 120 kHz typically used for sensing fish and zooplankton. The 10-mm long multilayer piezoelectric elements whose resonance frequency is 138 kHz were chosen for covering the high-frequency region. Acrylic disks of 13-mm thick as the front and rear masses were used for realizing the resonance at the low-frequency region. Also the diameter of 11 cm was determined for realizing suitable beamwidths 5–20°. Thirty elements were set in circular-shaped arrays on the disk and the two acrylic disks were fastened with four bolts. The peaks of the transmitting sensitivity were measured at 46 and 135 kHz, and the values were 168.3 and 165.3 dB re 1 μPa/V, respectively. Although ripples were observed, useful band around 46 and 135 kHz were 26–65 kHz (39-kHz bandwidth) and 110–142 kHz (32-kHz bandwidth), respectively. The transmitting sensitivity function from 70 to 105 kHz was flat, but the sensitivity of 158.0 dB re 1 μPa/V was lower than those of the above frequency range. The peaks of the receiving sensitivity were measured at 28 and 135 kHz, and the values were −188.5 and −173.6 dB re 1 μPa/V, respectively. The receiving sensitivity function was not flatter than the transmitting sensitivity function and the sensitivity at 70 kHz of −207.9 dB re 1 V/μPa was considerably low. The measured beam patterns at 38, 70, and 120 kHz were almost the same as that of the 11-cm diameter circular piston source. The broadband acoustic system was constructed using commercially available equipments and the measurement of the target strength spectra of a 38.1-mm diameter tungsten carbide sphere using a 20–150 kHz linear-frequency-modulated signal. The measured target strength spectra of the 38.1-mm sphere were in good agreement with the predictions except for the region of the low signal-to-noise ratio.
Starting Page	1
Ending Page	7
File Size	407589
Page Count	7
File Format	PDF
ISBN	9781457701658
e-ISBN	9781457701641
DOI	10.1109/UT.2011.5774113
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-05
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensitivity Transducers Broadband communication Resonant frequency Nonhomogeneous media Acoustic beams Acoustic measurements
Content Type	Text
Resource Type	Article

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