Verpillat F, Joud F, Atlan M, Gross M
Laboratoire Kastler Brossel: UMR 8552 CNRS- ENS- UPMC, 24 rue Lhomond 75231 Paris 05, France.
Opt Express. 2012 Sep 24;20(20):22860-71. doi: 10.1364/OE.20.022860.
We propose here to combine sideband holography with stroboscopic illumination synchronized with the vibration of an object. By sweeping the optical frequency of the reference beam such a way the holographic detection is tuned on the successive sideband harmonic ranks, we are able to image the instantaneous velocities of the object. Since the stroboscopic illumination is made with an electronic device, the method is compatible with fast (up to several MHz) vibration motions. The method is demonstrated with a vibrating clarinet reed excited sinusoidally at 2 kHz, and a stroboscopic illumination with cyclic ratio 0.15. Harmonic rank up to n = ± 100 are detected, and a movie of the instantaneous velocities is reported.
我们在此提议将边带全息术与与物体振动同步的频闪照明相结合。通过以这样一种方式扫描参考光束的光频率，即全息检测被调谐到连续的边带谐波等级上，我们能够对物体的瞬时速度进行成像。由于频闪照明是由电子设备实现的，该方法适用于快速（高达几兆赫兹）的振动运动。该方法通过一个以2千赫兹正弦激励的振动单簧管簧片以及占空比为0.15的频闪照明进行了演示。检测到了高达n = ± 100的谐波等级，并给出了瞬时速度的动态图像。
