Výsledky vyhledávání - "Marie Nakazawa"

Thickness Design, Fabrication, and Evaluation of 100-MHz Polyurea Ultrasonic Transducer

Autor: Marie Nakazawa, Sadayuki Ueha, Takahiro Aoyagi, Masaya Tabaru, Kentaro Nakamura

Publikováno v: IEEE Transactions on Ultrasonics, FerroelectrIcs, and Frequency control. 60(No. 10):2175-2188

In this paper, we present a polyurea transducer that works at 100 MHz under water. The transducer was designed using an equivalent circuit model so that an aluminum (top)-polyurea-aluminum (bottom)-polyimide layer had a resonant frequency of 100 MHz

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::601fe06b67b60d47a1c246a9d460e59c
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100661051

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Measurement of Surface Acoustic Wave Velocity Using a Variable-Line-Focus Polyurea Thin-Film Ultrasonic Transducer

Autor: S. Ueha, Marie Nakazawa, Kentaro Nakamura, Takahiro Aoyagi, Masaya Tabaru

Publikováno v: IEEE Transactions on UltrasonIcs, FerroelectrIcs, and Frequency control. 56(No. 8):1761-1768

This paper presents the novel measurement method of the surface acoustic wave velocity by the variable-line- focus transducer using a polyurea piezoelectric ultrasonic transducer. First, a multiresonant polyurea thin-film ultrasonic transducer is fab

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0789606c58186d039c8f89799b439161
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100585601

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Three-Axis Acceleration Sensor Using Polyurea Films

Autor: Marie Nakazawa, Sadayuki Ueha, Masaya Tabaru, Kentaro Nakamura

Publikováno v: Japanese Journal of Applied Physics. 47:4044-4047

Focusing on the possibilities of polyurea as an acceleration sensor with characteristics such as flexibility, durability against large deformation, good linearity, and capability of deposition in dryprocess and insolubility in organic solvent, we fir

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9c5c2364ae7934d1eb7a9ad1a721c84e
https://doi.org/10.1143/jjap.47.4044

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Numerical Analysis of Ultrasonic Beam of Variable-Line-Focus-Beam Film Transducer

Autor: Kentaro Nakamura, Takahiro Aoyagi, Marie Nakazawa, Sadayuki Ueha

Publikováno v: Japan Journal of Applied Physics. 46(No. 7B):4486-4489

In this study, the characteristics of an ultrasonic beam radiated by a variable-line-focus-beam transducer were numerically calculated by finite-difference time domain (FDTD) method and liquid-elastic wave reflection theory. The interference ripple c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b5a495e67579624c7e65281008de6be
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100544187

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Multilayered Transducers Using Polyurea Film

Autor: Kentaro Nakamura, Akihiro Maezawa, Marie Nakazawa, Sadayuki Ueha, Masaya Tabaru

Publikováno v: Jpn. J. Appl. Phys.. 46(No. 7B):4466-4473

We have been investigating ultrasonic transducers using a polyurea piezoelectric material, which is fabricated by vapor deposition. To enhance the transducer performance, a multilayered configuration is studied in this work. First, the fabrication an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b34359eea9541214c110f138faa2b11
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100549381

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Development of Sound Localization System with Tube Earphone Using Human Head Model with Ear Canal

Autor: Marie Nakazawa, Atsuhiro Nishikata

Publikováno v: IEICE Trans. Fundamentals. (12):3584-3592

In this study, we propose a new acoustic model including the human ear canal and a thin tube earphone. The use of a tube earphone enables simultaneous listening of both virtual and real surrounding sound. First, we perform acoustic FDTD (finite diffe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b64669a63e21c7e234935a6eb8a50751
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100406392

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Separating Nonlinear Propagation and Cavitation Effects in HIFU

Autor: Vera A. Khokhlova, Michael R. Bailey, Lawrence A. Crum, Justin A. Reed, Marie Nakazawa

Publikováno v: Proc. of IEEE-UFFC Ultrasonics Symposium. 1:728-731

High intensity focused ultrasound (HIFU) can destroy tumors or stop internal bleeding. The primary physical mechanism in HIFU is the conversion of acoustic energy to heat, which as HIFU amplitude increases is enhanced by nonlinear acoustic propagatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::344195b24ac1c664657166e57ae37beb
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100507509

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Polyurea thin film ultrasonic transducers for nondestructive testing and medical imaging

Autor: Akihiro Maezawa, Kentaro Nakamura, T. Kosugi, H. Nagatsuka, Marie Nakazawa, Sadayuki Ueha

Publikováno v: IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 54(10)

Ultrasonic transducers using polyurea piezoelectric thin film are studied in this paper. Aromatic polyurea thin films, prepared by vapor deposition polymerization, have useful characteristics for use as an ultrasonic transducer. This paper presents t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::92c942e576cce69ad2d197e6bb7a8125
https://pubmed.ncbi.nlm.nih.gov/18019256

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PS-14 A 100 MHz Multi-layered High Performance Transducer Using Polyurea Thin Film

Autor: Marie Nakazawa, Sadayuki Ueha, Akihiro Maezawa, Kentaro Nakamura

Publikováno v: 2006 IEEE Ultrasonics Symposium.

We have been investigating ultrasonic transducers using polyurea piezoelectric material, which is fabricated through vapor deposition process. To enhance the transducer performance, a multi-layered configuration is studied in this study. The fabricat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4384bd021ecd143f1b79410d4a533101
https://doi.org/10.1109/ultsym.2006.542

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