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首页> 外文会议>International Conference on Vibration Measurements by Laser and Noncontact Techniques >Laser Doppler Velocimetry for Measurement of Nonlinearity in the Vibrations of the Middle Ear
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Laser Doppler Velocimetry for Measurement of Nonlinearity in the Vibrations of the Middle Ear

机译：激光多普勒测速器，用于测量中耳振动中的非线性

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摘要

At audible Frequencies and at sound pressure below 96 dB SPL the mammalian middle ear is known to behave as an almost entirely linear system. However, as we go to higher sound pressure levels, smaller nonlinear distortions begin to appear, and increase with increasing pressure level. Some modern hearing aids seek to remedy hearing impairment by amplifying sounds to sound pressure levels as high as 130 or 140 dB SPL. Thus at these levels the small nonlinear distortions can become significant, and understanding their behaviour could help us to improve the design of these hearing aids. In order to measure the tiny vibration amplitudes of the middle ear, and to detect the even smaller nonlinear distortions, a very sensitive measurement and analysis method is needed. The tiny vibration amplitudes of the middle ear can easily be measured with laser vibrometry. Thanks to the highly linear response of LDV, the technique is also able to measure small nonlinearities. To detect the nonlinear distortions we developed a sophisticated measurement and analysis method based on the use of multisine excitation signals. These signals are specially designed to measure nonlinear systems. We will describe our set up and our stimulation and analysis method in detail, we will then go on to present some results of measurements at different points along the ossicular chain.
机译：在声音频率和低于96dB的声压下，已知哺乳动物中耳，表现为几乎完全的线性系统。然而，随着我们走到更高的声压级，较小的非线性扭曲开始出现，随着压力水平的增加而增加。一些现代化的助听器寻求通过放大声音的声音水平高达130或140 dB SPL的声音来解决听力损伤。因此，在这些层面上，小非线性扭曲可能会变得显着，并且了解他们的行为可以帮助我们改善这些助听器的设计。为了测量中耳的微小振动振动，并检测甚至更小的非线性扭曲，需要非常敏感的测量和分析方法。中耳的微小振动幅度可以通过激光振动器轻松测量。由于LDV的高度线性响应，该技术也能够测量小非线性。为了检测非线性扭曲，我们开发了基于多语激励信号的复杂测量和分析方法。这些信号专门设计用于测量非线性系统。我们将详细描述我们的设立和刺激和分析方法，然后我们将继续在沿着音箱链的不同点处呈现一些测量结果。

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