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首页> 外文会议>International Congress on Sound and Vibration >THE HETERODYNE LASER DOPPLER VIBROMETER USING AN ONE-SHOT F/V CONVERTER FOR MODE SHAPE ANALYSIS
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THE HETERODYNE LASER DOPPLER VIBROMETER USING AN ONE-SHOT F/V CONVERTER FOR MODE SHAPE ANALYSIS

机译：外差激光多普勒振动计使用单次F / V转换器进行模式形状分析

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The vibration can be measured by measuring the Doppler frequency because it is directly proportional to the surface velocity of the object. The differentiating method is widely used for the demodulation since the amplitude of the differentiated sinusoidal signal is proportional to the frequency of the interferent signal. However, the signal processing is complex to implement, resulting in generating the noise and nonlinearity. Furthermore, several versatile operational amplifiers are required to achieve the differentiation operation in high frequency region. Here, the method using an one-shot F/V converter is suggested to overcome the drawbacks of the previous method. The frequency in the one-shot F/V converter method can be easily obtained by measuring the period of the signal without any further signal processing since the period of the interferent sinusoidal signal is inversely proportional to the frequency of the signal. The one-shot F/V converter is very simple and robust to the variation of the amplitude of the interferent signal. The bandwidth of the signal processing using the one-shot F/V converter is 20kHz, and the maximum detectable velocity of the target is ±0.13m/s. A Zeeman frequency stabilized He-Ne laser instead of the AOM (acousto-optic-modulator) system is constructed to take the advantages of the simple and cheap interferometer construction, because it gives two different frequencies without any complex signal processing. The proposed vibration measurement technique is compared with the differentiation method experimentally.
机译：振动可以通过测量多普勒频率来测量，因为它与物体的表面速度成本成比例。差分方法广泛用于解调，因为差分正弦信号的幅度与干扰信号的频率成比例。然而，信号处理是为了实现的复杂，导致产生噪声和非线性。此外，需要几种通用的运算放大器来实现高频区域中的差异化操作。这里，建议使用单次F / V转换器的方法来克服先前方法的缺点。通过测量没有任何进一步的信号处理的信号的时段可以容易地获得单次F / V转换器方法中的频率，因为干扰正弦信号的周期与信号的频率成反比地成反比。单次F / V转换器对干涉信号幅度的变化非常简单且鲁棒。使用单次F / V转换器的信号处理带宽是20kHz，目标的最大可检测速度为±0.13m / s。构造了一个塞曼频率稳定的HE-NE激光器代替AOM（声光调制器）系统，以采取简单和廉价的干涉仪结构的优点，因为它在没有任何复杂信号处理的情况下提供了两种不同的频率。实验中提出的振动测量技术与分化法进行了比较。

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