Abstract
This paper proposes a novel strategy for low humidity detection, an optical waveguide (OWG) sensor that is locally coated with polyvinylpyrrolidone (PVP) film. The humidity sensor was fabricated using a spin coating on a K+-exchanged glass optical waveguide with PVP film. Its sensing properties were investigated by injecting a humid air range of 10.6~32%RH (relative humidity) at room temperature. The surface morphology of the PVP film was characterized by an atomic force microscope (AFM). The possible humidity sensing mechanism of the proposed sensor was discussed by using absorption spectra. This study showed that the PVP-coated OWG sensor possessed high sensitivity, stability, and rapid response/recovery. Therefore, these observed results demonstrate that the low-cost OWG humidity sensor could be applied in real-time low concentration water vapor monitoring.
Highlights
As we know, humidity monitoring is required in many fields, such as industry, pharmaceutical industry, storage, farming, etc
It can be found that the recovery time of the optical waveguide (OWG) humidity sensor was longer than its response time, and this phenomenon may be due to more dry air being gas stream was exhausted from the sample chamber, I basically restored to its original level with dry air
The humidity sensing properties of the OWG sensor were investigated by exposing it to a humidity range of 10.6~32%relative humidity (RH) at OWG sensor were investigated by exposing it to a humidity range of 10.6~32%RH at room room temperature
Summary
Humidity monitoring is required in many fields, such as industry, pharmaceutical industry, storage, farming, etc. The OWG sensor is based on the evanescent wave. Such as RI, density, absorbance, etc., which could be used as a sensitive probe. OWG sensors witnessed widespread application in the detecting biological molecules [14], metal ions have witnessed widespread application in the detecting biological molecules [14], metal [15], and low-concentration gas (such as xylene [16,17], chlorobenzene [18], ions [15], and low-concentration gas (such as xylene [16,17], chlorobenzene [18], ammonia [19,20], hydrogen chloride [21], simulant of chemical weapon agents [22,23]).
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