Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.
Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
Sci Rep. 2017 Sep 5;7(1):10413. doi: 10.1038/s41598-017-10919-5.
Digital holography allows production of high-speed three-dimensional images at rates over 100,000 frames per second; however, simultaneously obtaining suitable performance and levels of accuracy using digital holography is difficult. This problem prevents high-speed three-dimensional imaging from being used for vibrometry. In this paper, we propose and test a digital holography method that can produce vibration measurements. The method is based on single-shot phase-shifting interferometry. Herein, we imaged the surface of a loudspeaker diaphragm and measured its displacement due to the vibrations produced by a frequency sweep signal. We then analyzed the frequency of the experimental data and confirmed that the frequency spectra inferred from the reconstructed images agreed well with the spectra produced by the sound recorded by a microphone. This method can be used for measuring vibrations with three-dimensional imaging for loudspeakers, microelectromechanical systems, surface acoustic wave filters, and biological tissues and organs.
数字全息术允许以每秒超过 100,000 帧的速率生成高速三维图像；然而，同时使用数字全息术获得合适的性能和精度水平是困难的。这个问题阻止了高速三维成像在振动测量中的应用。在本文中，我们提出并测试了一种可以进行振动测量的数字全息术方法。该方法基于单次相移干涉测量法。在这里，我们对扬声器膜片的表面进行成像，并测量了由于频率扫描信号产生的振动而引起的位移。然后，我们分析了实验数据的频率，并确认从重建图像推断出的频谱与由麦克风记录的声音产生的频谱非常吻合。该方法可用于测量扬声器、微机电系统、声表面波滤波器以及生物组织和器官的三维成像中的振动。
