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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...
A ultrasonic transducer array was fabricated using an epitaxial Pb(Zr,Ti)O3 (PZT) thin film grown on SrRuO3/Pt/gamma-Al2O3/Si structures. The fabricated diaphragm transducer 2-D array with 8 times 8 elements has developed by XeF2 gas from the topside of Si.
Target strength (TS) of fish is important in order to convert acoustic integration values obtained by acoustic survey into estimates of fish abundance. A large indoor tank has been used in underwater acoustics experiments such as measurements of the target strength pattern of fish. It was equipped with an electric flatcar for the purpose of loading and positioning an ultrasonic transducer. A TS measurement...
Information on target strength (TS) is indispensable to the acoustic estimation of the existing biomass of the important small oceanic organisms. These kinds of target are lower in echo level, and more complex in shape than fish. We constructed a TS measurement system considering these characteristics. A live target was suspended and fixed in seawater, and a transducer rotated by a step angle around...
A piezoelectric ultrasonic hydrophone array was fabricated using diaphragm transducer on Si substrates. A two dimensional (2-D) array of 8 times 8 elements with diaphragm transducer has been developed by XeF2 etching from the topside of Si. In this paper, we describe the fabrication process of the diaphragm transducer array. A finite-element analysis (FEA) was calculated to evaluate the resonant frequency...
A chemical ion sensing using a gated lateral bipolar junction transistor (LBJT) has been performed. This letter reports the basic characteristics of the proposed device and the physical differences between a pure MOSFET-based device and gated LBJT, in giving consideration to an ion sensing. The operation in the linear region, the positive polarity between input bias and output signal, and the direct...
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