This manuscript introduces and demonstrates a visible curvature fiber optic sensor using an all-fiber Mach-Zehnder interferometer. The all-fiber interferometer was constructed using an in-line optical fiber sandwich structure, utilizing fibers specifically designed for the visible range. We demonstrate the reproducibility of the curvature sensor fabricating several distinct interferometers. These devices were subjected to curvature testing, exhibiting suitable wavelength shifts and achieving a maximal sensitivity of −10.44 nm/m. The hysteresis analysis shows minimal path deviation, and the statistical ANOVA analysis reveals a consistent mean trend with a minimal Prob > F value of 9.30472 × 10. Consequently, the hysteresis analysis indicates that the error in the curvature direction has a minimal impact on the measurement, and the low Prob > F value ensures that the curvature measurements cannot overlap. Then, accurate and high reproducibility of the curvature measurements can be expected. The results validate that the optical fiber structure is among the limited approaches to phase modulation interference within the visible range, representing a competitive alternative for curvature measurement.

中文翻译：

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“具有低应变温度依赖性的可见光范围曲率光纤传感器”

本手稿介绍并演示了使用全光纤马赫-曾德干涉仪的可见曲率光纤传感器。全光纤干涉仪采用在线光纤夹层结构构建，利用专为可见光范围设计的光纤。我们展示了制造几个不同干涉仪的曲率传感器的再现性。这些器件经过曲率测试，表现出合适的波长偏移并达到-10.44 nm/m的最大灵敏度。滞后分析显示路径偏差最小，统计 ANOVA 分析显示一致的平均趋势，最小 Prob > F 值为 9.30472 × 10。因此，滞后分析表明曲率方向的误差对测量的影响最小，并且较低的 Prob > F 值可确保曲率测量结果不会重叠。然后，可以预期曲率测量的精确性和高再现性。结果验证了光纤结构是可见光范围内相位调制干涉的有限方法之一，代表了曲率测量的有竞争力的替代方案。