Chen S, Palmer A W, Grattan K T, Meggitt B T
Appl Opt. 1992 Oct 1;31(28):6003-10. doi: 10.1364/AO.31.006003.
Several important digital processing techniques for optical-fiber sensor systems that use electronically scanned white-light interferometry are presented. These include fringe restoration, fringe-order identification, and resolution enhancement techniques. A pure low-coherence interference fringe pattern is restored by dividing, pixel by pixel, the beam intensity profile from the signal. The central (zero-order) fringe of the pattern is identified by using a centroid algorithm. A linear interpolation or a localized centroid algorithm is used to enhance further the phase resolution. Theoretical analyses, computer simulations, and experimental verifications have shown that these techniques are able to increase greatly the dynamic range of the measurement under a low signal-to-noise ratio environment.
介绍了几种用于采用电子扫描白光干涉测量法的光纤传感器系统的重要数字处理技术。这些技术包括条纹恢复、条纹级次识别和分辨率增强技术。通过逐像素地分割来自信号的光束强度分布，恢复出纯低相干干涉条纹图案。利用质心算法识别该图案的中心（零级）条纹。使用线性插值或局部质心算法进一步提高相位分辨率。理论分析、计算机模拟和实验验证表明，这些技术能够在低信噪比环境下大幅提高测量的动态范围。
