Graphene oxide based optical fiber humidity sensor having a linear response throughout a large dynamic range and
Applied Optics
|January 4, 2024
Summary
This study introduces a novel optical fiber sensor for accurately measuring relative humidity (RH). The sensor demonstrates a highly linear response across a wide range with exceptionally fast response and recovery times, making it ideal for precise environmental monitoring.
Area of Science:
- Photonics and Sensing Technologies
- Materials Science for Environmental Monitoring
- Nanomaterials in Sensor Development
Background:
- Accurate relative humidity (RH) sensing is crucial for various environmental and industrial applications.
- Existing optical fiber sensors often face limitations in linearity, dynamic range, or response speed.
- Graphene oxide (GO) has shown potential for humidity sensing due to its unique properties.
Purpose of the Study:
- To develop a high-sensitivity optical fiber relative humidity (RH) sensor.
- To achieve a linear response over a wide dynamic range with optimal response/recovery times.
- To utilize a simple optical fiber sensing configuration for practical implementation.
Main Methods:
- Fabrication of an optical fiber RH sensor using a graphene oxide (GO) diffused silica nanostructured thin film as cladding.
- Employment of an intensity modulation scheme via evanescent wave absorption spectroscopy.
- Detailed experimental analysis of the sensor's response characteristics, including dynamic range, sensitivity, and response/recovery times.
Main Results:
- The developed sensor exhibits a linear response over the widest dynamic range (15.0%-95.3%RH) compared to other GO-based sensors.
- Achieved shortest (fastest) response and recovery times of 0.1436 s and 0.1547 s, respectively.
- Demonstrated a linear sensitivity of 0.1036 dB/%RH, along with excellent reversibility, reliability, and repeatability.
Conclusions:
- The proposed optical fiber sensor effectively meets the objective of high sensitivity, linearity, wide dynamic range, and fast response/recovery times.
- The simple configuration and superior performance characteristics make it a promising candidate for advanced RH sensing applications.
- The sensor's reliability and repeatability confirm its potential for practical and robust humidity monitoring solutions.
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