International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, Jiangsu, China.
Sensors (Basel). 2012;12(6):7318-25. doi: 10.3390/s120607318. Epub 2012 May 30.
A simple and high sensitive method employing a hybrid long period grating (LPG)/chirped fiber Bragg grating (CFBG) for refractive index (RI) measurements is proposed and investigated experimentally. The wide wavelength range of backward cladding modes are excited through the coupling and recoupling between LPG and CFBG. Experimental results indicate that the recoupled cladding modes between LPG and CFBG and core mode are modulated by the surrounding RI and highly sensitive RI measurements can be achieved by simply measuring the reflected intensity changes of the recoupled cladding modes and core mode.
提出并实验研究了一种用于折射率（RI）测量的简单且高灵敏度的混合长周期光栅（LPG）/啁啾光纤布拉格光栅（CFBG）方法。通过 LPG 和 CFBG 之间的耦合和再耦合，激发了反向包层模式的宽波长范围。实验结果表明，LPG 和 CFBG 之间的再耦合包层模式和芯模被周围 RI 调制，通过简单测量再耦合包层模式和芯模的反射强度变化，可以实现高灵敏度的 RI 测量。
