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Tungsten disulfide (WS₂) based all-fiber-optic humidity sensor.

Yunhan Luo, Chaoying Chen, Kai Xia

|May 4, 2016

Summary

We developed a new all-fiber-optic humidity sensor using a tungsten disulfide (WS₂) film on a side-polished fiber. This sensor offers high sensitivity and resolution for accurate humidity monitoring in various photonics applications.

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Area of Science:

Photonics
Materials Science
Sensor Technology

Background:

Accurate humidity monitoring is crucial for various industrial and environmental applications.
Traditional humidity sensors often face limitations in terms of response time, stability, and integration with existing systems.
Fiber-optic sensors offer advantages like remote sensing, immunity to electromagnetic interference, and miniaturization.

Purpose of the Study:

To demonstrate a novel all-fiber-optic humidity sensor.
To investigate the performance characteristics of a WS₂-coated side-polished fiber sensor for humidity detection.
To assess the sensor's potential for practical applications in humidity sensing networks.

Main Methods:

Fabrication of a side-polished fiber (SPF) coated with a tungsten disulfide (WS₂) film.

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Characterization of the sensor's optical power response to varying relative humidity (RH) levels.

Evaluation of sensor performance metrics including linearity, sensitivity, resolution, repeatability, and reversibility.

Main Results:

The WS₂-coated SPF sensor exhibited an optical power variation of up to 6 dB over a relative humidity range of 35%-85%.
The sensor demonstrated a high linear correlation coefficient (99.39%), sensitivity of 0.1213 dB/%RH, and a humidity resolution of 0.475%RH.
The sensor showed excellent repeatability, reversibility, and a rapid response to stimuli like breath.

Conclusions:

The developed WS₂-based all-fiber optic humidity sensor is easy to fabricate and compatible with existing fiber optic systems.
This novel sensor exhibits high performance, making it suitable for accurate and reliable humidity detection.
The sensor holds significant potential for integration into all-fiber optic humidity sensing networks and other photonics applications.