Decraemer W F, Khanna S M, Funnell W R
Laboratory of Experimental Physics, University of Antwerp, Belgium.
Hear Res. 1989 Mar;38(1-2):1-17. doi: 10.1016/0378-5955(89)90123-8.
The amplitude and phase of the tympanic membrane and malleus vibrations were measured over a wide frequency range with a homodyne interferometer. When sound pressure was maintained constant near the tympanic membrane, the malleus frequency response followed the typical pattern up to 10 kHz as measured by previous investigators. At higher frequencies the response changes dramatically. Instead of decreasing with frequency, between 10 and 20 kHz the vibration amplitude oscillates around a value which is only about 20 dB lower than the low frequency plateau level. Measurements of malleus vibration at several points along its length indicate that its mode of vibration changes at high frequencies, and no longer consists of a simple rotational component. All points on the tympanic membrane vibrate in phase with the malleus up to a frequency of 1 kHz. Above 5 kHz discrete resonances are observed, and the response varies strongly with position on the tympanic membrane.
使用零差干涉仪在很宽的频率范围内测量了鼓膜和锤骨振动的幅度和相位。当鼓膜附近的声压保持恒定时，锤骨的频率响应在高达10kHz的范围内遵循先前研究人员所测量的典型模式。在更高频率下，响应会发生显著变化。在10至20kHz之间，振动幅度不是随频率降低，而是围绕一个仅比低频平稳水平低约20dB的值振荡。沿锤骨长度上几个点的锤骨振动测量表明，其振动模式在高频时发生变化，不再由简单的旋转分量组成。鼓膜上所有点在高达1kHz的频率下与锤骨同相振动。在5kHz以上观察到离散共振，并且响应随鼓膜上的位置变化很大。
