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提出了一种基于纵向微结构光纤的分布式压力传感方案,该方案同时采用波长编码与频率编码技术,实现了单根光纤上的准分布式压力测量,具有实现大容量复用、高空间分辨率和高精度测量的潜力。采用硫化硅橡胶聚合物材料对光纤进行封装,使纵向微结构光纤的压力灵敏度提升至1.032×10-3相对波长变化/MPa,是裸光纤光栅压力灵敏度的500多倍。构建了包含6个光纤微结构的单纤传感系统,并进行了分布式压力测试实验,实验结果显示出很好的线性度和较高的测量精度。该传感方案具有长距离、高分辨率测压(HRM)的潜力,可广泛运用于土木结构健康监测、管道泄漏监控、人体体内压力分布式传感等工程领域中。
A distributed pressure sensing scheme based on longitudinal microstructured optical fiber is proposed. The scheme uses both wavelength encoding and frequency encoding simultaneously to achieve quasi-distributed pressure measurement on a single optical fiber. It achieves high-capacity multiplexing, high spatial Resolution and high-precision measurement potential. The encapsulation of the optical fiber by the vulcanized silicone rubber polymer material enhances the pressure sensitivity of the longitudinal microstructure optical fiber to 1.032 × 10-3 relative wavelength change / MPa, which is more than 500 times the sensitivity of the bare optical fiber grating. A single fiber sensing system consisting of 6 optical fiber microstructures was constructed and distributed stress test was carried out. The experimental results show good linearity and high measurement accuracy. The sensing scheme has the potential of long-distance, high-resolution manometry (HRM) and can be widely used in engineering fields such as civil structure health monitoring, pipeline leak monitoring and human body pressure distributed sensing.