All-Optical Humidity Sensor Using SnO2 Nanoparticle Drop Coated on Straight Channel Optical Waveguide

• 来源期刊: 光子传感器（英文版）
• 关键词: Humidity measurement SnO2 nanoparticle optical sensors
• 年，卷（期）: 2020,（2）
• 页码范围: 123-133
• 页数: 11页
• 语种: 英文
• DOI: 10.1007/s13320-019-0563-8

摘要

The straight channel optical waveguide coated with the SnO2 nanoparticle is studied as an all-optical humidity sensor.The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity (RH) from 56％ to 90％ with very good repeatability.The sensitivity to changes in relative humidity is ～2 dB/％ RH.The response time of the humidity sensor is 2.5 s,and the recovery time is 3.5 s.The response to humidity can be divided into 3 different regions,which are correlated to the degree of water adsorption in the SnO2 nanoparticle layer.Compared with the previous all-optical humidity sensor based on SnO2,the proposed sensor exhibits more rapid response,simpler fabrication process,and higher sensitivity.The proposed sensor has a potential application in the long distance,remote agriculture,and biological humidity sensing.