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A. Vujanic, Z. Djinovic, M.C. Tomic, S. Mitic, R. Pavelka, D. Vujanic, C. Kment, M. Cordes:
"Low-Power Implantable Vibrometer for Measurement of Nanometric Vibrations Inside Middle Ear";
Talk: 1st Vienna International Conference on Micro- and Nano-Technology - Viennano'05, Vienna, Austria; 03-09-2005 - 03-11-2005; in: "1st Vienna International Conference on Micro- and Nano-Technology - Proceedings", Österreichische Tribologische Gesellschaft, Wien (2005), ISBN: 3-901657-17-7; 33 - 40.

In this paper we present a method and minature system for contactless measurement of vibrations of ossicles of animal
and human middle ear. The basic principle of operation of the developed micro-optical system is low coherence
interferometry. The system is realised in the form of miniaturised fiber-optic sensor with only one sensing fiber directed
to the oscillating target (e.g. incus). The vibrations of the incus were succesfully investigated from 200Hz to 10kHz
under the acoustic pressure in the range of 70 to 90 dB (which corresponds to the amplitude of vibrations of several
nanometers p-p). All measurements were obtained for about 200μm distance between the incus and sensing fiber which
enables continuous functionality of the method even in the case of large quasistatic movements of auditory ossciles.
Special care was given to the design of the optoelectronic part in the way to provide extremely low power consumption
of the whole system, which is very important for medical implants. The current prototype of the system has power
consumption of about 6mW.

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