基于SMF-PDMS-DCF的柔性曲率传感器设计

Design of Flexible Curvature Sensor Based on SMF-PDMS-DCF

为克服现有曲率传感器测量曲率范围小、灵敏度不高等缺陷,设计了一种以单模光纤(single mode fiber,SMF)和双芯光纤(double-core fiber,DCF)为干涉结构的SMF-PDMS-DCF柔性曲率传感器。该传感器使用聚二甲基硅氧烷(polydimethylsiloxane,PDMS)柔性材料作为耦合器,将单模光纤和双芯光纤软连接起来,利用PDMS材料和双芯光纤构成悬臂梁,使悬臂梁弯曲可以检测出曲率大小。经实验表明:曲率在0~4.1198 m^(-1)时,反射光的波长、光谱强度都和曲率之间具有良好的线性关系;从波长和曲率的关系看,灵敏度最高可达-0.3118 nm/m^(-1);从光谱强度和曲率的关系看,灵敏度最高可到-1.6715 dB/m^(-1)。

In order to overcome the defects of small curvature range and low sensitivity of existing curvature sensor,a SMF-PDMS-DCF flexible curvature sensor with single mode fiber(SMF)and double core fiber(DCF)as the interference structure was designed.A flexible material called polydimethylsiloxane(PDMS)was used as a coupler to soft connect single-mode fiber and dual-core fiber.The cantilever beam was made of PDMS material and double core optical fiber.The curvature could be detected by bending the cantilever beam.Experimental results show that when the curvature is within 0~4.1198 m^(-1),the wavelength and intensity of the reflected light have a good linear relationship with the curvature.From the relationship between the wavelength and the curvature,the sensitivity is up to-0.3118 nm/m^(-1).From the relationship between the light intensity and the curvature,the sensitivity can be up to-1.6715 dB/m^(-1).