The ionic self-assembly technology is used to deposit polymer multilayer thin films onto the end faces of optical fibers. The assemblies of the polymer multilayers and the working principle of the fiber optic humidity-sensing element is introduced. The specialties of this polymer multilayer sensing element are investigated.%利用离子自组装技术在光纤端面上制备了具有多层结构的、含有亲水基团的聚电解质感湿薄膜,介绍了这种光纤湿度敏感元件的工作原理,测试了其感湿特性。
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