Villey Richard, Carrion Lionel, Morneau Dominic, Boudoux Caroline, Maciejko Roman
Centre d'optique, photonique et laser, Department of Engineering Physics, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montreal, Quebec, Canada.
Appl Opt. 2010 Jun 1;49(16):3140-9. doi: 10.1364/AO.49.003140.
We present a real-time time-domain Doppler optical coherence tomography (OCT) system based on the zero-crossing method for velocity measurements of fluid flows with attainable velocities up to 10 m/s. In the current implementation, one-dimensional and two-dimensional velocity profiles of fluid flows ranging from 1 cm/s to more than 3 m/s were obtained for both laminar and turbulent flows. The line rate was approximately 500 Hz, and the images were treated in real time. This approach has the advantage of providing reliable velocity maps free from phase aliasing or other artifacts common to several OCT systems. The system is particularly well suited for investigating complex velocity profiles, especially in the presence of steep velocity gradients.
我们展示了一种基于过零法的实时时域多普勒光学相干断层扫描（OCT）系统，用于测量流体流速，可达速度高达10米/秒。在当前的实现中，对于层流和湍流，均获得了流速范围从1厘米/秒到超过3米/秒的一维和二维速度剖面。线速率约为500赫兹，并且图像是实时处理的。这种方法的优点是能够提供可靠的速度图，而不会出现相位混叠或其他一些OCT系统常见的伪像。该系统特别适合研究复杂的速度剖面，尤其是在存在陡峭速度梯度的情况下。
