Acoustical imaging of an object buried in seafloor sediment by using a focused ultrasonic transducer

1980 ◽  
Vol 67 (5) ◽  
pp. 1603-1607 ◽  
Author(s):  
Masakatsu Ohgaki ◽  
Ryoji Shimizu ◽  
Hisashi Miyazawa ◽  
Motoyoshi Okujima
Keyword(s):  
Ultrasonic Transducer ◽  
Acoustical Imaging ◽  
Seafloor Sediment

Nanoparticles Generation using Mono-disperse Droplets by an Ultrasonic Transducer

2020 ◽  
Vol 140 (2) ◽  
pp. 37-42
Author(s):  
Nozomu Fujimoto ◽  
Takefumi Kanda ◽  
Masaya Katsuta ◽  
Yusaku Sakata ◽  
Yoshiaki Yamada ◽  
...  
Keyword(s):  
Ultrasonic Transducer

Modeling of a high frequency ultrasonic transducer using periodic structures

2007 ◽  
Author(s):  
P. Maréchal ◽  
L. Haumesser ◽  
G. Feuillard ◽  
L.P. Tran-Huu-Hue ◽  
J. Holc ◽  
...  
Keyword(s):  
High Frequency ◽  
Periodic Structures ◽  
Ultrasonic Transducer

Design and Experiment of Capacitive Micromachined Ultrasonic Transducer Array for High-Frequency Underwater Imaging

2020 ◽  
Vol 13 ◽  
Author(s):  
Yuanyu Yu ◽  
Jiujiang Wang ◽  
Xin Liu ◽  
Sio Hang Pun ◽  
Weibao Qiu ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
High Frequency ◽  
Ultrasonic Transducer ◽  
Center Frequency ◽  
Design Parameters ◽  
Underwater Imaging ◽  
Release Process ◽  
Steel Wires ◽  
Capacitive Micromachined Ultrasonic Transducer ◽  
Frequency Ultrasound

Background:: Ultrasound is widely used in the applications of underwater imaging. Capacitive micromachined ultrasonic transducer (CMUT) is a promising candidate to the traditional piezoelectric ultrasonic transducer. In underwater ultrasound imaging, better resolutions can be achieved with a higher frequency ultrasound. Therefore, a CMUT array for high-frequency ultrasound imaging is proposed in this work. Methods:: Analytical methods are used to calculate the center frequency in water and the pull-in voltage for determining the operating point of CMUT. Finite element method model was developed to finalize the design parameters. The CMUT array was fabricated with a five-mask sacrificial release process. Results:: The CMUT array owned an immersed center frequency of 2.6 MHz with a 6 dB fractional bandwidth of 123 %. The pull-in voltage of the CMUT array was 85 V. An underwater imaging experiment was carried out with the target of three steel wires. Conclusion:: In this study, we have developed CMUT for high-frequency underwater imaging. The experiment showed that the CMUT can detect the steel wires with the diameter of 100 μm and the axial resolution was 0.582 mm, which is close to one wavelength of ultrasound in 2.6 MHz.

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