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提出了一种可以用于曲率矢量测量的温度不敏感的错位熔接-粗锥型光子晶体光纤(PCF)曲率传感器,它由两段普通单模光纤(SMF)之间熔接一段PCF组成,呈SMF-PCF-SMF结构。其中PCF的一端与SMF错位熔接导致传感器圆柱轴不对称,使得传输光谱在两个对称弯曲方向上出现明显的红移和蓝移现象;另一端与SMF通过过度熔接形成粗锥,最终形成马赫-曾德尔干涉仪。实验研究了传感器的曲率和温度特性,结果表明,在0.12~1.06m-1的曲率范围内,凹向弯曲时的光谱发生红移,其灵敏度为11.22nm/m-1,凸向弯曲时的光谱发生蓝移,其灵敏度为-13.62nm/m-1,且凹向弯曲时和凸向弯曲时均具有较好的线性度;在20~80℃的温度范围内,此传感器的温度灵敏度仅为1.63pm/℃,具有对温度不敏感的特性。该传感器与传统光纤传感器相比,能够避免温度与曲率同时测量时的交叉敏感问题,具有易于制备、结构简单、灵敏度高等优势,可用于工业生产、建筑监测、航天航空等领域。
A temperature insensitive dislocation fusion-rough tapered photonic crystal fiber (PCF) curvature sensor, which can be used for curvature vector measurement, is composed of a section of PCF fused between two ordinary single-mode optical fibers (SMF) -PCF-SMF structure. One end of the PCF and SMF misalignment welding lead to the sensor cylinder axis is asymmetric, so that the transmission spectrum in the two symmetrical bending direction obvious redshift and blue shift phenomenon; the other end and the SMF by over-welding to form a rough cone, the final formation Mach- Zehnder interferometer. The experimental results show that the sensitivity of the sensor to red-shift is about 11.22nm / m-1 in the curvature of 0.12 ~ 1.06m-1, The blue shift of the spectrum occurs, its sensitivity is -13.62nm / m-1, and it has good linearity when concave bending and convex bending; in the temperature range of 20 ~ 80 ℃, the temperature sensitivity of this sensor is only 1.63pm / ℃, with temperature-insensitive properties. Compared with the traditional optical fiber sensor, the sensor can avoid the cross-sensitivity problem of simultaneous measurement of temperature and curvature. The sensor has the advantages of easy preparation, simple structure and high sensitivity, and can be used in industrial production, construction monitoring, aerospace and other fields.