Coherent optical frequency domain reflectometry has been widely used to locate static reflectors with high spatial resolution. Here, we present a new type of Doppler optical frequency domain reflectometry that offers simultaneous measurement of the position and speed of moving objects. The system is exploited to track optically levitated “flying” particles inside a hollow-core photonic crystal fiber. As an example, we demonstrate distributed temperature sensing with sub-mm-scale spatial resolution and a standard deviation of ∼10°C up to 200°C.

中文翻译：

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多普勒光学频域反射仪用于远程光纤传感

相干光频域反射仪已被广泛用于定位具有高空间分辨率的静态反射器。在这里，我们介绍了一种新型的多普勒光学频域反射仪，它可以同时测量移动物体的位置和速度。该系统被用来跟踪空心光子晶体光纤中的光学悬浮的“飞行”粒子。例如，我们展示了具有亚毫米级空间分辨率和200°C时约10°C的标准偏差的分布式温度传感。