边孔光纤长周期光栅的传感特性研究  

Sensing characteristics of side-hole fiber long-period grating

作　　者：辛奕[1] 董新永[1] 袁俊伟[1] 张淑琴[1] 李裔[1] 金尚忠[1] 

机构地区：[1]中国计量学院光电子技术研究所,浙江杭州310018

出　　处：《光电子．激光》2013年第11期2070-2074,共5页Journal of Optoelectronics·Laser

基　　金：国家"873"计划(2010CB327804);国家自然科学基金(61007050;61007051);浙江省自然科学基金(Z13F05003)资助项目

摘　　要：采用CO2激光脉冲技术在边孔光纤(SHF)上写入长周期光栅(LPG),并对其温度、外界折射率和弯曲的传感特性进行测试。实验表明,当温度从20℃升高到80℃时,SHF-LPG的谐振波长随温度升高线性蓝移6.51nm,温度灵敏度为-0.11nm/℃。其对外界折射率的敏感度随折射率升高而增加,越接近光纤包层的有效折射率灵敏度越高,测量范围为1.34-1.44;其谐振波长随弯曲曲率的增加线性红移,但弯曲传感灵敏度具有较强的方向相关性,最大达到9.36nm/m-1。Long-period gratings （LPGs） were fabricated in a side-hole fibe r （SHF） by using a pulsed CO2laser.Sensing characteristics of this SHF-LPG to temperature,su rrounding refractive index and bending have been investigated experimentally.Experimental results show that the resonant wavelength of the SHF-LPG has a blue shift of 6.51nm with temperature increasing in a range from 20℃ to 80℃ with sensitivity of -0.11nm/℃,a blue shift with increasing sensitivity and surrounding refractive index ranging from 1.34to 1.44（the m aximum sensitivity is achieved when the surrounding refractive index reaches the effect ive index of the fiber cladding）,and a red shift with bending-direction-dependent sensitiv ity up to 9.36nm/m^-1.

关 键 词：边孔光纤(SHF) 长周期光纤光栅(LPG) 温度 弯曲 折射率 

分 类 号：O436[机械工程—光学工程]