Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel
Source abstract
Abstract
In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.
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Research context
OpenAlex topics: Advanced Fiber Optic Sensors · Photonic and Optical Devices · Semiconductor Lasers and Optical Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
I3N & Physics Department, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
References (37)
Show source-provided references
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