P1M-8 Acoustic Properties of Nanofoam and its Applied Air-Borne Ultrasonic Transducers

Author

Nagahara, Hidetomo ; Suginouchi, Takehiko ; Hashimoto, Masahiko

Author_Institution

Adv. Technol. Res. Lab., Matsushita Electr. Ind. Co. Ltd., Kyoto

fYear

2006

fDate

2-6 Oct. 2006

Firstpage

1541

Lastpage

1544

Abstract

Nanofoam is a porous material called drying gel or aerogel. Nanofoam has a low density and a low acoustic velocity. Because of these properties, it was considered that nanofoam can realize high performance air-borne ultrasonic transducer. We applied nanofoam to two types of ultrasonic transducers. One is a matching layer type of ultrasonic transducer (ML-UT), and the other is refractive propagation type of ultrasonic transducer (RP-UT). The sensitivity of ML-UT was twenty times as high as conventional. And we confirmed the basic operation of RP-UT on the basis of the observation of the propagation of ultrasonic in the peculiar direction and broadband characteristics. The frequency bandwidth of RP-UT was more than three times as wide as conventional

Keywords

acoustic wave velocity; aerogels; foams; nanostructured materials; ultrasonic propagation; ultrasonic refraction; ultrasonic transducers; ML-UT sensitivity; RP-UT frequency bandwidth; RP-UT operation; aerogel; air borne ultrasonic transducers; broadband characteristics; drying gel; matching layer type ultrasonic transducer; nanofoam acoustic properties; nanofoam acoustic velocity; nanofoam density; porous material; refractive propagation type ultrasonic transducer; ultrasonic propagation; Acoustic propagation; Acoustic reflection; Acoustic refraction; Bandwidth; Ceramics; Frequency; Impedance; Nanoporous materials; Silicon compounds; Ultrasonic transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2006. IEEE

Conference_Location

Vancouver, BC

ISSN

1051-0117

Print_ISBN

1-4244-0201-8

Electronic_ISBN

1051-0117

Type

conf

DOI

10.1109/ULTSYM.2006.391

Filename

4152247