Vibration sensor based on stretchable optical fiber and interferometric measurement

Soft polymer optical fiber (SPOF) has shown great potential in optical based wearable and implantable biosensors due to its excellent mechanical properties and optical guiding characteristics. However, the multimodality characteristics of SPOF limit their integration with traditional fiber optic sensors. This article introduces for the first time a flexible fiber optic vibration sensor based on laser interference technology, which can be applied to vibration measurement under high strain conditions. This sensor utilizes elastic optical fibers made of polydimethylsiloxane (PDMS) as sensing elements, combined with phase generating carrier technology, to achieve vibration measurement at 50~400 Hz within the strain range of 0~42%. 软聚合物光纤（SPOF）因其优异的机械性能和光导特性，在基于光学的可穿戴和可植入生物传感器中显示出巨大的潜力。然而，单点光纤的多模态特性限制了它们与传统光纤传感器的集成。本文首次介绍了一种基于激光干涉技术的柔性光纤振动传感器，可应用于高应变条件下的振动测量。该传感器利用聚二甲基硅氧烷（PDMS）制成的弹性光纤作为传感元件，结合相位发生载体技术，在0~42%的应变范围内实现50~260 Hz的振动测量。