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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

Polymer microfiber rings for high-sensitivity optical humidity sensing.

Pan Wang¹, Fuxing Gu, Lei Zhang

¹State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.

|November 17, 2011

Summary

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We developed a new high-sensitivity sensor using polyacrylamide (PAM) microfibers and microrings for accurate relative humidity (RH) detection. This innovative sensor offers a fast response time and a wide dynamic range for reliable moisture monitoring.

Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Relative humidity (RH) monitoring is crucial in various fields.
Existing RH sensors face challenges in sensitivity, response time, and dynamic range.
Microring resonators offer potential for high-performance sensing applications.

Purpose of the Study:

To develop a novel microring-based sensor for high-sensitivity RH detection.
To investigate the performance characteristics of polyacrylamide (PAM) microfibers in RH sensing.
To demonstrate the feasibility of using spectral shifts for quantitative humidity measurements.

Main Methods:

Fabrication of microrings integrated with polyacrylamide (PAM) microfibers.
Exposure of the sensor to varying levels of relative humidity (RH).

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Monitoring of spectral shifts in the microring's resonance peaks as a function of RH.

Characterization of sensor sensitivity, response time, and dynamic range.

Main Results:

The PAM microfiber-based microring sensor exhibited monotonic inflation with increasing RH.
Significant spectral shifts in resonance peaks were observed due to water absorption.
Achieved high sensitivity of 490 pm/%RH.
Demonstrated a rapid response time of approximately 120 ms.
Operated effectively within a dynamic range of 5% to 71% RH.

Conclusions:

The developed microring sensor assembled with PAM microfibers shows excellent potential for high-sensitivity RH sensing.
The sensor's performance metrics (sensitivity, response time, dynamic range) are promising for practical applications.
Spectral shift measurement is an effective method for quantitative humidity detection using this sensor design.