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http://dx.doi.org/10.21288/resko.2017.11.2.133

Proposition of a Vibration Based Acceleration Sensor for the Fully Implantable Hearing Aid  

Shin, Dong Ho (경북대학교 의공학연구소 리서치펠로우)
Mun, H.J. (경북대학교 대학원 전자공학부)
Seong, Ki Woong (경북대학교병원 의공학과)
Cho, Jin-Ho (경북대학교 IT대학 전자공학부)
Publication Information
Journal of rehabilitation welfare engineering & assistive technology / v.11, no.2, 2017 , pp. 133-141 More about this Journal
Abstract
The hybrid acoustic sensor for implantable hearing aid has the structure in which a sound pressure based acoustic sensor (ECM) and a vibration based acceleration sensor are combined. This sensor combines the low frequency sensitivity of an acoustic sensor with the high frequency sensitivity of an acceleration sensor, allowing the acquisition of a wide range of sound from low to high frequency. In this paper, an acceleration sensor for use in a hybrid acoustic sensor has been proposed. The acceleration sensor captures the vibration of the tympanic membrane generated by the acoustic signal. The size of the proposed acceleration sensor was determined to diameter of 3.2 mm considering the anatomical structure of the tympanic membrane and the standard of ECM. In order to make the hybrid acoustic sensor have high sensitivity and wide bandwidth characteristics, the aim of the resonance frequency of the acceleration sensor is to be generated at about 3.5 kHz. The membrane of the acceleration sensor derives geometric structure through mathematical model and finite element analysis. Based on the analysis results, the membrane was implemented through a chemical etching process. In order to verify the frequency characteristics of the implemented membrane, vibration measurement experiment using external force was performed. The experiment results showed mechanical resonance of the membrane occurred at 3.4 kHz. Therefore, it is considered that the proposed acceleration sensor can be utilized for a hybrid acoustic sensor.
Keywords
Fully-implantable hearing aid; Acceleration sensor; Finite element method;
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