ホログラフィ干渉法による鼓膜振動解析の実験的研究
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概要
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Ear drum vibrations were studied in frogs by means of time-averaged holography. This method is useful for analysis of vibration and unique techniques which can record mode of vibration and vibration amplitude at a time. As the fringes represent iso-amplitude contours like those on geodesic maps, themode of vibration is clearly descenble at a glance. 17 ear drums from 17 frogs (Rana nigromaculata) were employed in the present experiments.Results were as follows.1) Vibration amplitude of the ear drum increased with SPL, but the vibration pattern remained substantially unchanged in each frequency.2) In each frequency, the first fringes appeared at 80-90dB.3) The complicated vibration pattern, showed two or more mounds, was recorded in this study. This pattern seemed to show the role of tympanic membrane as a buffering apparatus to decreased SPL.4) Under 1 kHz, the ear drum showed rather a simple pattern. Above 4 kHz the pattern became more complicated, containing two or more mounds.5) At about 2-3 kHz, proper vibration number was observed.
- 一般社団法人 日本耳鼻咽喉科学会の論文