HEC/PVDF作为光纤湿度传感器感湿材料性能研究

Study on performance HEC/PVDF wet-sensing material for fiber-optic humidity sensor

制作了一种基于以聚偏氟乙烯(PVDF)/羟乙基纤维素(HEC)共混物为感湿材料的折光率变化型光纤湿度传感器。对共混物感湿膜的膜厚度、皮层长度以及共混物的配比进行了考察,并用扫描电镜(SEM)对感湿膜进行了表征。结果表明:用PVDF和HEC共混物合成的感湿膜具有抗人为涂层误差、常温下无需温度补偿等优点;材料PVDF∶HEC为1∶2制备的感湿膜性能最优,具有宽检测范围和高灵敏度。

A refractive index change type optical fiber sensor baseds on blends of polyvinylidene fluoride（PVDF） and hydroxyethyl cellulose （HEC） as wet-sensing material is fabricated. The thickness, length, as well as the ratio of blends of wet-sensing film were studied, and then were characterized by scanning electron microscopy （SEM）. The results showed that the coated film made from blends of PVDF and HEC has the advantage of anti-human error, not required temperature compensation at room temperature, etc. The wet-sensing film made of 1：2 （PVDF： HEC） has the best performance of wide detecting range and high sensitivity.