一个高敏感的金属涂的长时期的纤维栅栏(LPFG ) 传感器基于材料分散被设计。基于联合模式理论,金属涂的 LPFG 的双山峰的特征上的材料分散的影响被学习。在考虑材料分散以后, dual-resonant-wavelength 的跳的区域向双山峰的金属涂的 LPFG 传感器的更薄的电影厚度,和敏感变到液体折射索引(RI ) 能被获得供应精确参数联合。试验性地,有不同电影厚度的二种银涂的 LPFG 和栅栏时期被制作监视盐答案,并且这二个传感器的敏感被比较。试验性的结果与理论分析一致。这个工作被国家自然科学基金会支持了中国(No.60777035 ) ,科学研究钥匙工程资金(号码 208040 ) ,上海市政的教育委员会(No.11ZZ131 ) 的革新节目,和带学术纪律的上海投射(No.S30502 ) 。
A high-sensitivity metal-coated long-period fiber grating (LPFG) sensor based on material dispersion is designed. Based on the coupled mode theory, the influence of the material dispersion on the dual-peak characteristics of the metal-coated LPFG is studied. After considering the material dispersion, the jumping region of the dual-resonant-wavelength shifts toward the thinner film thickness, and the sensitivity of the dual-peak metal-coated LPFG sensor to liquid refractive index (RI) can be obtained to supply accurate parameter combinations. Experimentally, two kinds of silver-coated LPFGs with different film thicknesses and grating periods are fabricated to monitor the salt solution, and the sensitivities of these two sensors are compared. The experimental results are consistent with the theoretical analyses.