论文部分内容阅读
报道了一种具有高分辨率和高效且价廉的解调系统的光纤布拉格光栅(FBG)温度传感器。提出了光纤光 栅的金属槽封装技术,以提高传感光栅的温度灵敏性。研究了金属槽封装光栅的温度灵敏性,理论分析和实验结 果表明,封装光栅的温度灵敏系数比普通裸光栅提高了3.6倍。系统利用一长周期光栅(LPG)作为线性滤波器, 宽带光源经此长周期光栅调制后入射到传感光栅,可解调布拉格传感光栅的波长位移。理论分析与实验结果一 致,系统可达到的温度分辨率为0.02℃。
A Fiber Bragg Grating (FBG) temperature sensor with a high resolution and efficient and inexpensive demodulation system is reported. A metal groove encapsulation technology of fiber grating is proposed to improve the temperature sensitivity of the sensing grating. The temperature sensitivity of metal grating encapsulated grating is studied. The theoretical analysis and experimental results show that the temperature sensitivity coefficient of encapsulated grating is 3.6 times higher than that of normal bare grating. The system uses a long-period grating (LPG) as a linear filter. The broadband light source is incident on the sensing grating through this long-period grating and demodulates the wavelength shift of the Bragg grating. The theoretical analysis is consistent with the experimental results. The temperature resolution achievable by the system is 0.02 ℃.