High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion

被引：11
|
作者：
Reinis, Pauls Kristaps [1 ]
Milgrave, Lase [1 ]
Draguns, Kristians [1 ]
Brice, Inga [1 ]
Alnis, Janis [1 ]
Atvars, Aigars [1 ]
机构：
[1] Univ Latvia, Inst Atom Phys & Spect, Quantum Opt Lab, LV-1586 Riga, Latvia
来源：
SENSORS | 2021年 / 21卷 / 05期
关键词：
whispering gallery mode; humidity sensor; microsphere resonator; glycerol; tunable laser; RESONATOR; WATER; WGM;
D O I：
10.3390/s21051746
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
We demonstrate a highly sensitive whispering gallery mode (WGM) relative humidity (RH) sensor based on a glycerol microdroplet. WGMs were excited using a 760 nm tunable semiconductor laser. We used free space coupling, which is effective when using a liquid resonator. A detailed analysis of different parameters influencing the sensor's characteristics (sensitivity, hysteresis, resolution, stability, and temperature) is presented. The sensitivity of the sensor is one of the highest reported (2.85 nm/% RH in the range 50-70% RH with the resolution 1 x 10(-4)% RH). This type of humidity sensor has several advantages, such as high sensitivity, extended lifetime, good repeatability, and low cost, as well as the use of a non-toxic and environmentally friendly liquid.
引用
收藏
页码：1 / 13
页数：13
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