传感技术学报2017，Vol.30Issue(3)：341-347,7.DOI:10.3969/j.issn.1004-1699.2017.03.002
基于ELC谐振器的湿度传感器
Humidity Sensor Based on ELC Resonator
摘要
Abstract
LC-resonanted humidity sensor has become a research focus which because it's wireless passive and can extends application greatly.Metamaterials is selected as the resonator structure to deal with problems of large size and low sensitivity that the conventional LC-resonanted humidity sensor exists.The humidity sensor consists of an ELC resonator and polyvinyl alcohol film.Firstly,through analyzing the effect of the ELC resonator's main structural parameters on resonant characteristics by electromagnetic simulation software,an ELC resonator is designed and made.It has a resonant frequency of 2.45 GHz and quality factor of 302.Then,the humidity sensor is fabricated through coating the prepared polyvinyl alcohol solution on the surface of ELC resonator by drop coating method.At last,its humidity sensitivity is tested by utilizing two antennas in microwave mode without any external circuit.The experimental results show that permeability is positive in the whole band and permittivity is negative from 2.19 GHz to 2.98 GHz.The experimental results show that this humidity sensor shifts 69.875 MHz totally when the relative humidity range from 35% RH to 88% RH and humidity sensitivity η reaches 71.5 MHz/% RH at 83% RH~88% RH.Studies show that ELC resonator as the humidity sensor's structure achieves miniaturization and high quality factor which improves the humidity sensitivity due to its metamaterials's property.关键词
湿度传感器/超常媒质/ELC谐振器/PVA薄膜Key words
humidity sensors/metamaterials/ELC resonator/PVA film分类
信息技术与安全科学引用本文复制引用
薛严冰,孟影,宋智..基于ELC谐振器的湿度传感器[J].传感技术学报,2017,30(3):341-347,7.基金项目
国家自然科学基金(61201092 （）
61471080) （）
辽宁省高等学校优秀人才支持计划(LJQ2013047) （LJQ2013047）
