Measurement of frequency response of the bone ossicles in the sheep middle ear by the fiber-optic microphone

摘要

In this paper we present a contactless technique for measurement of acoustic vibrations and frequency response of the bone ossicles in the sheep middle ear. This technique is based on high-coherence interferometry performed by a single mode fiber-optic sensing configuration with just one sensing fiber directed against the target. High-coherence light of 1310 nm wavelength has been impinging a retroreflective target that is firmly fixed upon the incus of the middle ear. We measured frequency response of the middle ear causing vibration of the incus by generation of air pressure from a well calibrated acoustic source in the range of 50 to 90 dB SPL and frequency from 250 Hz to 6 kHz.