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研制了一种基于级联长周期光纤光栅对(LPFGP)用作液体折射率检测的聚合物封装温度减敏的新型结构。选用负热光系数的OE4110聚合物材料作为封装的基底材料,封装结构中引入一个特殊的凹槽,方便待测溶液通过通孔进入。封装后的LPFGP谐振波长温度灵敏度约10pm/℃,而相同参数的未封装的LPFGP的温度灵敏度为120pm/℃,封装后的LPFGP大大降低了传感器谐振波长对温度变化的灵敏度。本文的封装装置融保护和温度补偿功能于一体,特殊的结构设计使之适用于液体折射率的检测。
A novel structure based on cascaded long periodic fiber grating (LPFGP) for temperature detection of polymer refractive index was developed. The OE4110 polymer material with negative thermal coefficient is selected as the base material of the package. A special groove is introduced into the package structure to facilitate the solution to be tested to enter through the through hole. The temperature sensitivity of LPFGP resonant wavelength after encapsulation is about 10 pm / ℃, while that of unpackaged LPFGP with the same parameters is 120 pm / ℃. The encapsulated LPFGP greatly reduces the sensitivity of sensor resonant wavelength to temperature change. The packaging device of this article melts the protection and the temperature compensates the function in an organic whole, the special structure design makes it suitable for the liquid refractive index examination.