Hei Kefei, Anandarajah Kaszubowska, Martin Eamonn P, Shi Guang, Anandarajah Prince M, Bhattacharya Nandini
Opt Express. 2021 Mar 15;29(6):8108-8116. doi: 10.1364/OE.413478.
The measurement of distance plays an important role in many aspects of modern societies. In this paper, an absolute distance measurement method for arbitrary distance is proposed and demonstrated using mode-resolved spectral interferometry with a gain-switched dual comb. An accuracy of 12 µm, when compared to a He-Ne fringe counting laser interferometer, for a displacement up to 2.5 m is demonstrated by tuning the repetition frequency of the dual comb from 1.1 GHz to 1.4 GHz. The compact measurement system based on a gain-switched dual comb breaks the constraint of periodic ambiguity. The simplification and improvements are significant for further industrial applications.
距离测量在现代社会的许多方面都起着重要作用。本文提出并演示了一种使用增益开关双梳状频谱干涉术测量任意距离的绝对距离测量方法。通过将双梳状频谱的重复频率从1.1GHz调至1.4GHz，在与氦氖条纹计数激光干涉仪对比时，对于高达2.5m的位移，证明了其精度为12μm。基于增益开关双梳状频谱的紧凑型测量系统打破了周期性模糊的限制。这些简化和改进对于进一步的工业应用具有重要意义。
