Vibration measurement of the tympanic membrane using electronic speckle pattern interferometry

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Although some techniques for the measurement of tympanic membrane vibration have alreaby been existed, their sensitivity to vibration amplitude is poor, and they need high SPL for the measurement. As a result, they are not suitable for the clinical application. Therefore, in this study, using the time-averaged electronic speckle pattern interferometry, the sinusoidal phase modulation technique by a direct modulation of laser injection current and the digital image processing technique an attempt is made to develop a system for the measurement of tympanic membrane small vibration. Then, the vibratory responses of guinea pig tympanic membranes are measured by this system. The results of this study indicate that the vibration amplitude is detectable in nanometer order even when the stimulus level is small, e.g. 70dB SPL.Consequently, the system developed by our group has a potential of the clinical application.