豚鼠耳蜗基底膜响应特性的实验测试与分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (4) : 160-164.

论文

豚鼠耳蜗基底膜响应特性的实验测试与分析

塔娜1，张景1，许立富1，周雷2，黄新生2，饶柱石1

作者信息 +

Experimental measurement and analysis on dynamic response of cochlear basilar membrane in guinea pig

TA Na1, ZHANG Jing1, XU Lifu1, ZHOU Lei2, HUANG Xinsheng2, RAO Zhushi1

Author information +

文章历史 +

摘要

为探究耳蜗基底膜的动态特性，利用激光多普勒测振仪(Laser Doppler Vibrometer, LDV)测试了豚鼠耳蜗基底膜在纯音激励下的动态响应。实验时，选取了14只新鲜的豚鼠耳蜗离体标本，分别测试了70dB、80dB、90dB三种声激励下耳蜗基底膜的速度响应和位移响应，并改变输入声音信号的频率，研究了基底膜的振动特性。实验结果表明：纯音激励下基底膜的振动是正弦振动；在大小相同、频率不同的纯音激励下，基底膜同一位置处振动速度和振动位移大小不同，基底膜具有频率选择特性，在最佳频率处振动响应最大；基底膜在不同大小声压激励下相位响应趋势接近，超过最佳频率后相位滞后迅速增加；基底膜的运动具有行波特征。实验方法和测试结果可为人耳耳蜗听觉机制的研究提供指导。

Abstract

To explore the dynamic characteristics of basilar membrane, the dynamic responses to pure tone in the basilar membrane (BM) of guinea pig were measured by using Laser Doppler Vibrometer (LDV).14 fresh specimens of guinea pig cochlea in vitro were used to test the velocity response and the displacement response of BM under pure tone excitation of 70dB, 80dB, and 90dB SPL.And the vibration characteristics of BM was analyzed by changing the frequency of the input sound signal.The experimental results show that the vibration of BM under pure tone excitation is sinusoidal vibration. The vibration velocity and displacement of BM at the same location varies from the frequency of input sound signal and the BM has the frequency selective characteristics and the maximum vibration response appears at the best frequency.The phase responses of BM under different sound pressures excitation have the similar trend and phase-delay increases rapidly above the best frequency. The sound transmission in the BM has the characteristic of travelling wave. The experimental methods and results guided studying the auditory mechanism of human ear.

导出引用

塔娜1，张景1，许立富1，周雷2，黄新生2，饶柱石1. 豚鼠耳蜗基底膜响应特性的实验测试与分析[J]. 振动与冲击, 2018, 37(4): 160-164

TA Na1, ZHANG Jing1, XU Lifu1, ZHOU Lei2, HUANG Xinsheng2, RAO Zhushi1. Experimental measurement and analysis on dynamic response of cochlear basilar membrane in guinea pig[J]. Journal of Vibration and Shock, 2018, 37(4): 160-164

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