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制作了一种基于光子晶体光纤(PCF)和单模光纤(SMF)错芯结构的全光纤传感器。实验中,采用5cm的PCF,将其两端分别与SMF错芯熔接,制成传感单元。第1个错芯结构将宽带光源的光分别耦合到PCF的纤芯和包层中,纤芯模式和包层模式经过一定传输距离后进行SMF的纤芯,满足相位条件的发生干涉。在光谱仪(OSA)中观测其干涉谱。当外界温度、折射率变化时,观测干涉峰位置的改变可实现对温度和折射率的传感。实验结果显示,本文光纤传感器对温度的灵敏度为-8×10-3 nm/℃,对折射率的灵敏度为102nm/RIU。对PCF填充乙醇后,制成相同结构的传感器,温度灵敏度达到-1.008nm/℃,提高了123倍。本文传感器制作简单,操作方便,能够广泛应用于生物和物理传感领域。
An all-optical fiber sensor based on photonic crystal fiber (PCF) and single-mode fiber (SMF) has been fabricated. Experiment, the use of 5cm of PCF, both ends of their respective SMF core fusion, made of sensing unit. The first core-of-core structure couples the light from the broadband source to the core and cladding of the PCF, respectively. The core and cladding modes pass through the core of the SMF after a certain transmission distance to meet the phase condition. The interference spectrum was observed in a spectrometer (OSA). When the outside temperature and refractive index change, observing the change of interference peak position can realize the sensing of temperature and refractive index. Experimental results show that the sensitivity of the optical fiber sensor to temperature is -8 × 10-3 nm / ° C and the sensitivity to refractive index is 102 nm / RIU. PCF filled with ethanol, made of the same structure of the sensor, the temperature sensitivity of -1.008nm / ℃, increased by 123 times. This sensor is simple to create, easy to operate, can be widely used in biological and physical sensing.