Poittevin Julien, Picart Pascal, Faure Charly, Gautier François, Pézerat Charles
Appl Opt. 2015 Apr 10;54(11):3185-96. doi: 10.1364/AO.54.003185.
This paper describes a digital holographic setup based on in-line holography and a high-speed recording to get a multipoint vibrometer. The use of a high-speed sensor leads to specificities that enable the in-line configuration to be used. The case of transient vibrations is investigated through a full simulation of the holographic process. The simulation shows that the first instants are critical since distortion may occur, resulting in errors in the phase measurement. Experimental results are provided by exciting an aluminum beam with a transient signal. A comparison with the velocity measured by a pointwise vibrometer is provided. Frequency response functions are extracted and the experimental results confirm the ability of the method to provide full-field contactless measurements at the high-speed time scale evolution of the vibration.
本文描述了一种基于同轴全息术和高速记录的数字全息装置，用于获得多点振动计。高速传感器的使用带来了一些特性，使得同轴配置得以应用。通过对全息过程的全面模拟研究了瞬态振动的情况。模拟表明，最初的瞬间至关重要，因为可能会出现失真，从而导致相位测量误差。通过用瞬态信号激励铝梁来提供实验结果。提供了与逐点振动计测量的速度的比较。提取了频率响应函数，实验结果证实了该方法在振动的高速时间尺度演变中提供全场非接触测量的能力。
