Abstract
The vibrational characteristics of a model B-71 bone vibrator were determined using a laser vibrometer. The bone vibrator is normally used for auditory evoked potential testing. The purpose of these measurements was to characterize the performance of this device between a frequency range of 500–5000 Hz. The dynamic characteristics of the bone vibrator were measured with the device mounted on a Beltone model M5B artificial mastoid. Frequency response functions were determined for the bone vibrator/mastoid system at several locations. Subsequently, transfer functions between the driving voltage and the seismic mass of the bone vibrator, the case of the bone vibrator, and the artificial mastoid were determined, as well as the transfer function between the seismic mass and the mastoid. The vibrations of the bone vibrator were obtained with a high degree of spatial resolution by focusing the vibrometer laser beam on the location of interest to obtain the instantaneous velocity at that point. The mastoid response was measured with a conventional accelerometer. Besides the resonance associated with the seismic mass, two structural modes of the bone vibrator case were identified in the frequency range of interest and the mode shapes of the case vibrations were investigated.
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