Monitoring strain is important in precision engineering applications that require maintaining the precise alignments of structures over time, such as those found in machine tools and metrology frames. We present a fiber-optic strain measurement technique based upon broadband interferometry that is variously configurable in terms of gauge length and sensitivity. This is achieved by the use of an unbalanced interrogation interferometer configuration that alleviates the cavity length limit imposed by the temporal coherence of the system. We also demonstrate that dispersion in fiber sensors based on intrinsic Fabry–Perot interferometers must be considered to optimize performance. The possibility of multisensor interrogation using the same optical system is also reported.

中文翻译：

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使用宽带干涉仪的柔性标距本征光纤应变传感器[邀请]

在需要长期保持结构精确对准的精密工程应用中，例如在机床和计量框架中发现的应变，监视应变非常重要。我们提出了一种基于宽带干涉测量的光纤应变测量技术，该技术可根据轨距长度和灵敏度进行多种配置。这是通过使用不平衡的询问干涉仪配置来实现的，该配置减轻了由于系统的时间相干性而引起的腔体长度限制。我们还证明，必须考虑基于固有Fabry-Perot干涉仪的光纤传感器中的色散以优化性能。还报告了使用同一光学系统进行多传感器询问的可能性。