Das Bhargab, Chandra Vikash
Appl Opt. 2016 Oct 10;55(29):8287-8292. doi: 10.1364/AO.55.008287.
We present an experimental comparative study of the two most commonly used fiber Bragg grating (FBG) sensor interrogation techniques: a charge-coupled device (CCD) spectrometer and a fiber Mach-Zehnder interferometer (F-MZI). Although the interferometric interrogation technique is historically known to offer the highest sensitivity measurements, very little information exists regarding how it compares with the current commercially available spectral-characteristics-based interrogation systems. It is experimentally established here that the performance of a modern-day CCD spectrometer interrogator is very close to a F-MZI interrogator with the capability of measuring Bragg wavelength shifts with sub-picometer-level accuracy. The results presented in this research study can further be used as a guideline for choosing between the two FBG sensor interrogator types for small-amplitude dynamic perturbation measurements down to nano-level strain.
我们展示了对两种最常用的光纤布拉格光栅（FBG）传感器询问技术的实验性比较研究：电荷耦合器件（CCD）光谱仪和光纤马赫曾德尔干涉仪（F-MZI）。尽管从历史上看，干涉式询问技术以提供最高灵敏度测量而闻名，但关于它与当前市售的基于光谱特性的询问系统相比如何，却几乎没有相关信息。在此通过实验确定，现代CCD光谱仪询问器的性能非常接近F-MZI询问器，能够以亚皮米级精度测量布拉格波长偏移。本研究中呈现的结果可进一步用作在两种FBG传感器询问器类型之间进行选择的指导方针，用于低至纳米级应变的小幅度动态扰动测量。
