基于可拉伸光纤和干涉测量的振动传感器
Vibration sensor based on stretchable optical fiber and interferometric measurement
doi: 10.37188/CO.EN-2025-0010
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摘要:
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，柔性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，可应用于大拉伸条件下的振动测量。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%的拉伸范围内实现50~260 Hz的振动测量。
Abstract: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 stretch 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 50−260 Hz within the stretch range of 0−42%.
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Figure 1. (a) Structure diagram of vibration sensing system based on SPOF. (b) schematic diagram of arctangent algorithm
Figure 2. (a) PDMS flexible optical waveguide fabrication process. (b), (c) Sectional images and surface morphology of SPOF under optical microscope. (d) MMF-SPOF-MMF structure after demolding.
Figure 3. Mechanical and optical properties of SPOF: (a) PDMS transmission spectrum. (b) Optical loss evaluation of 5 SPOF samples, blue represents the optical loss measured without any testing, and red represents the optical loss measured after
1000 stretching cycles. (c) Optical loss of SPOF. (d) Optical loss of SPOF measured after1000 stretching cycles.
Figure 4. Mechanical properties of SPOF (a) The relationship between transmitted light intensity and stretching amount under cyclic dynamic stretching state. (b) The relationship between stretching length and transmitted light intensity.
Figure 5. The relationship between the interference signal and the signal generated by the signal light passing through the point of and the reference light when the random disturbance is applied.
Figure 6. SPOF measures the phase change response use of several representative frequency points at a fixed stretch.
Figure 7. PDMS-SPOF affixed to the surface of the balloon is used to obtain different stretching amounts of the measured fiber by charging and deflating the balloon.
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