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Machine learning-assisted high-accuracy and large dynamic range thermometer in high-Q microbubble resonators.

Hao Chen, Zhengyu Wang, Yan Wang

|May 9, 2023

Summary

Multimode sensing using whispering gallery mode (WGM) resonators extracts more information than single-mode tracking. This advanced approach enhances measurement accuracy for applications like temperature detection.

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Area of Science:

Optics and Photonics
Sensing Technologies
Machine Learning Applications

Background:

Whispering gallery mode (WGM) resonators offer high sensitivity and fast response for precise measurements.
Traditional WGM sensing methods often ignore valuable data from multiple resonances, limiting performance.
Developing novel sensing strategies is crucial to fully leverage WGM resonator capabilities.

Purpose of the Study:

To demonstrate that multimode sensing in WGM resonators contains more Fisher information than single-mode tracking.
To investigate the potential of multimode sensing for achieving superior measurement performance.
To develop an intelligent optical sensing system based on WGM resonators.

Main Methods:

Utilizing a microbubble resonator as the sensing platform.
Implementing an automated experimental setup to collect multimode spectral signals.
Employing a generalized regression neural network (GRNN) machine learning algorithm for data analysis and temperature prediction.

Main Results:

The multimode sensing method achieved an average temperature error of 3.8 × 10⁻³ °C within the 25.00°C to 40.00°C range.
Demonstrated that multimode sensing contains more Fisher information compared to single-mode tracking.
Analyzed the impact of data resources, including training data volume and temperature range variations, on prediction accuracy.

Conclusions:

Multimode sensing significantly enhances the performance of WGM resonator-based sensors.
The developed GRNN-based temperature detection system exhibits high accuracy and a large dynamic range.
This work establishes a foundation for intelligent optical sensing utilizing WGM resonators.