High‐frequency pulse‐compression ultrasound imaging using an 18‐MHz annular array

2006 ◽  
Vol 120 (5) ◽  
pp. 3194-3194
Author(s):  
Jonathan Mamou ◽  
Jeffrey A. Ketterling ◽  
Ronald H. Silverman
Keyword(s):  
Ultrasound Imaging ◽  
High Frequency ◽  
Pulse Compression ◽  
Annular Array ◽  
Compression Ultrasound ◽  
Frequency Pulse

scholarly journals High-Frequency Chirp Ultrasound Imaging with an Annular Array for Ophthalmologic and Small-Animal Imaging

2009 ◽  
Vol 35 (7) ◽  
pp. 1198-1208 ◽  
Author(s):  
Jonathan Mamou ◽  
Orlando Aristizábal ◽  
Ronald H. Silverman ◽  
Jeffrey A. Ketterling ◽  
Daniel H. Turnbull
Keyword(s):  
Ultrasound Imaging ◽  
High Frequency ◽  
Small Animal Imaging ◽  
Small Animal ◽  
Frequency Chirp ◽  
Annular Array ◽  
Animal Imaging

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.

scholarly journals The Effect of High Frequency Pulse on the Discharge Probability in Micro EDM

2017 ◽  
Vol 281 ◽  
pp. 012031
Author(s):  
Y Liu ◽  
Y Qu ◽  
W Zhang ◽  
F Ma ◽  
Z Sha ◽  
...  
Keyword(s):  
High Frequency ◽  
Micro Edm ◽  
Frequency Pulse
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