Various methods have been proposed to measure vibration frequency. However, mechanical systems are not efficient as they have to be attached to the object of interest. So, the measurements are not precise when a new mass is introduced to the vibration surface. Besides, obtaining the power and phase distribution on the whole surface of the vibrating object is not possible through using accelerometers or other mechanical vibrometers. Out-of-plane vibration detection was previously proposed by one of the authors, using one pitch phase analysis method. In this paper, a novel accurate in-plane vibration detection technique by using sampling moir method is proposed. This paper is the first published report on the in-plane vibration distribution of an industrial scale size object. Since noncontact deformation distribution of a deformed body is possible using sampling moir method, in this study sampling moir method is applied to vibration analysis of a tuning fork using a high-speed camera. This paper shortly describes the principle of in-plane vibration detection method and compares the experimental in-plane frequency results with those obtained by an accurate laser displacement meter. Moreover, for the first time, power and phase distribution graphs of the whole surface of the tuning fork, in two different frequency modes, are obtained. This technology will be useful for vibration investigation in any movable object on an industrial scale.

已经提出了各种方法来测量振动频率。但是，机械系统效率不高，因为它们必须附加到感兴趣的对象上。因此，当将新的质量引入振动表面时，测量结果并不精确。此外，通过使用加速度计或其他机械振动计不可能获得振动物体整个表面上的功率和相位分布。平面外振动检测是一位作者先前使用一种螺距相位分析方法提出的。本文提出了一种新的采用采样莫尔方法的精确面内振动检测技术。本文是有关工业规模尺寸物体的面内振动分布的第一份公开报告。由于使用采样莫尔方法可以实现变形体的非接触变形分布，因此在本研究中，采样莫尔方法用于使用高速摄像机对音叉进行振动分析。本文简要介绍了平面内振动检测方法的原理，并将实验中的平面内频率结果与精确的激光位移计获得的结果进行了比较。此外，首次获得了两个不同频率模式下音叉整个表面的功率和相位分布图。该技术对于工业规模的任何可移动物体的振动研究都是有用的。本文简要介绍了平面内振动检测方法的原理，并将实验中的平面内频率结果与精确的激光位移计获得的结果进行了比较。此外，首次获得了两个不同频率模式下音叉整个表面的功率和相位分布图。该技术对于工业规模的任何可移动物体的振动研究都是有用的。本文简要介绍了平面内振动检测方法的原理，并将实验中的平面内频率结果与精确的激光位移计获得的结果进行了比较。此外，首次获得了两个不同频率模式下音叉整个表面的功率和相位分布图。该技术对于工业规模的任何可移动物体的振动研究都是有用的。