基于聚合物体光栅膨胀实现全息湿度传感装置研制

摘要

聚合物基全息传感器采用成分共混、蒸发溶剂方法制膜,以丙烯酰胺聚合物系统作为全息光栅记录介质,基底选用具有吸湿能力的聚乙烯醇.传感器对环境湿度具有较高的敏感性,当水分子渗透进入基底内部后,与其中的极性分子发生键合,导致分子间作用力的改变,从而实现基底的膨胀.通过光纤光谱仪直接读取,衍射峰值波长偏移十分显著.通过定量化湿度与全息参量的关系,能够实现全息传感器的定标,这为装置的实用化提供了更多的定量依据.%Recently,holographic optical element based on polymer has been paid much attention due to its low cost,simple process,excellent performance,and obvious optical phenomenon.The fringe space recorded inside the materials can be changed by the environmental conditions.It brings about wavelength shift of diffraction peak.The corresponding sensing process is achieved during the process.Based on acrylamide systems with polyvinyl alcohol (PVA) binder the novel holographic sensor is formed by solvent evaporation.This holographic sensor is sensitive to the environmental humidity.After osmosis of water molecules into the binder,the intermolecular forces can be changed by bonding with polar molecules and then the swelling process of binder can be caused.Using fiber spectrometer to measure the diffraction wavelength,the wavelength shift is obvious for the instrument.The quantitative relations between relative humidity and holographic properties can bring about a calibration.