Abstract
A novel high sensitivity relative humidity (RH) sensor was proposed by using micro structure plastic optical fiber (POF) based on the surface plasmon resonance (SPR) effect and the evanescent wave (EW) loss. The micro structure was fabricated on the POF and coated with a gold layer and agarose, adopting the sputtering and dip-coating technique. These construction effects on the attenuation of power caused by the SPR effect and the EW loss were used to perform RH detections. The agarose’s different refractive indexes (RIs) caused fluctuations in the transmission power when the humidity increased. The demonstrated experimental results showed that the proposed sensor achieved a linear response from 20% RH to 80% RH with a high sensitivity of 0.595µW/%. The proposed sensor had the advantages of fast response and recovery. Furthermore, the temperature dependence and the repeatability test of the sensor were also performed.
Highlights
Relative humidity (RH) attracts lots of attention, from agriculture, medicine, and other fields [1,2,3]
The effect of agarose on the RH response to the proposed sensor was investigated in the experiment
The slope of the response curve with agarose is significantly higher than the slope of the response curve without agarose. It indicated that the sensor with the agarose sensor was more sensitive to humidity than that without agarose. This loss occurring in transmitted power was due to the effect of the surface plasmon resonance (SPR) effect and evanescent wave (EW) loss, and its intensity change was more significant than that under the influence of EW loss
Summary
Relative humidity (RH) attracts lots of attention, from agriculture, medicine, and other fields [1,2,3]. Gratings have unique spectral characteristics, combined with different hydrophilic materials, which increase the system’s stability and sensitivity [5,6,7,8,9] These sensors are cross-sensitive to temperature and strain, limiting the measurement accuracy. Model interference RH sensors such as photonic crystal fiber (PCF) [10], multi-segment splicing [11], and tapered fiber [12] have attracted attention owing to special structures. This type of fiber has the disadvantages of high price and low robustness, which increases the difficulty of sensor fabrication and system construction. Many materials such as SnO2 [13, 14], Article type: Regular
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