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ID 17739
Eprint ID
17739
FullText URL
86_215.pdf 4.29 MB
Title Alternative
Application of Holography to the Study of Hearing -Analysis of the eardrum vibration-
Author
Ogura, Yoshio
Kimura, Yusuke
Uyemura, Tsuneyoshi
Yamamoto, Yoshitaka
Udagawa, Tetsuo
Abstract
Holographic interferometry is a specific technique for the analysis of vibration. Images of vibrating body reconstructed with this method are superimposed by interference fringes. As the fringes represent iso-amplitude contours like those on geodesic maps, the mode of vibration is clearly discernible at a glance. As the amplitudes relating to each fringe are calibrated according to the wavelength of the laserlight the value is most precise and submicroscopic, viz., 10(-5)cm order. In this study eardrum vibrations are investigated by means of time-averaged holography on frogs and guinea-pigs. The first fringe appeared at about 80 dB sound pressure level in both animals. The vibratory pattern appeared to be constant depending upon the number of frequencies of the test tones. At low frequency the eardrum showed rather a simple pattern; with increasing frequencies the pattern became more complicated containing two or more mounds.
Keywords
岡山医学会
Published Date
1974-06-30
Publication Title
岡山医学会雑誌
Publication Title Alternative
Journal of Okayama Medical Association
Volume
volume86
Issue
issue5-6
Publisher
岡山医学会
Publisher Alternative
Okayama Medical Association
Start Page
215
End Page
219
ISSN
0030-1558
NCID
AN00032489
Content Type
Journal Article
Official Url
https://www.jstage.jst.go.jp/article/joma1947/86/5-6/86_5-6_215/_article/-char/ja/
Related Url
http://www.okayama-u.ac.jp/user/oma/
language
日本語
Copyright Holders
岡山医学会
File Version
publisher
Refereed
True
Eprints Journal Name
joma