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首页> 外文期刊>Optics and Lasers in Engineering >Measurement Of Non-linear Distortions In The Vibration Of Acoustic Transducers And Acoustically Driven Membranes
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Measurement Of Non-linear Distortions In The Vibration Of Acoustic Transducers And Acoustically Driven Membranes

机译：声学换能器和声驱动膜振动中的非线性失真测量

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Different methods exist to quantify non-linearity, and recently a new method was proposed that uses multisines to determine output response level, noise level, and level of non-linear distortions simultaneously from one single short experiment. We used heterodyne vibrometry to measure the vibration of a membrane while it is stimulated acoustically, and to determine the non-linear distortions in its response with this new method of analysis. We demonstrate the method on an electrically driven earphone. Analysis of the sound output and optically measured vibration deliver comparable results, and clearly detect non-linear distortions. Next, we apply the method on an acoustically driven elastic membrane. At vibration amplitudes of the same magnitude as on the earphone, non-linear distortions are much smaller, as to be expected on an elastic membrane, but they can still be detected with the vibrometer. This technique can be used to investigate the non-linearity of acoustically driven systems such as the middle ear.
机译：存在多种量化非线性的方法，最近提出了一种新的方法，该方法使用多正弦波从一个短时间实验中同时确定输出响应级别，噪声级别和非线性失真级别。我们使用外差振动测量法来测量膜在受到声学刺激时的振动，并通过这种新的分析方法确定其响应中的非线性失真。我们在电动耳机上演示了该方法。对声音输出和光学测量的振动进行分析可获得可比的结果，并清楚地检测出非线性失真。接下来，我们将该方法应用于声学驱动的弹性膜上。在与耳机相同的振幅下，非线性失真要小得多，这在弹性膜上是可以预料的，但是仍然可以用振动计检测到。此技术可用于研究声学驱动系统（例如中耳）的非线性。

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