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Related Experiment Video

Updated: Jun 9, 2025

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

Published on: March 8, 2020

FBG Interrogator Using a Dispersive Waveguide Chip and a CMOS Camera.

Zhenming Ding^1,2, Qing Chang³, Zeyu Deng¹

¹Laboratory of Photonic Integration, School of Engineering, Westlake University, 18 Shilongshan Road, Hangzhou 310024, China.

|October 26, 2024

Summary

This summary is machine-generated.

A new, cost-effective method uses a waveguide spectral lens (WSL) and CMOS camera to interrogate fiber Bragg grating (FBG) temperature sensors. This approach offers a practical alternative to complex, expensive FBG interrogation systems.

Keywords:

FBG interrogator fiber Bragg gratings integrated optics waveguide spectral lens

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Last Updated: Jun 9, 2025

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

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Published on: March 8, 2020

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Published on: September 30, 2019

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Published on: May 11, 2014

Area of Science:

Optical Sensing
Photonics
Sensor Technology

Background:

Fiber Bragg gratings (FBGs) offer advantages over electronic sensors, including electromagnetic interference immunity and suitability for harsh environments.
Current FBG interrogation systems are often complex and costly, hindering widespread adoption.
Developing cost-effective and practical interrogation methods is crucial for advancing FBG sensor technology.

Purpose of the Study:

To present a novel, clean, and cost-effective method for interrogating FBG temperature sensors.
To demonstrate the feasibility of using a waveguide spectral lens (WSL) and a standard CMOS camera for FBG interrogation.
To evaluate the performance of the proposed system against a commercial optical spectrum analyzer (OSA).

Main Methods:

Development of an interrogation system utilizing a micro-chip waveguide spectral lens (WSL) and a CMOS camera.
Projection of the FBG transmission spectrum onto the camera without free-space optical components.
Implementation of data processing techniques, including direct spatial shift analysis and deep neural network training, for temperature sensing.

Main Results:

The WSL-camera system demonstrated comparable wavelength-temperature sensitivity (6.33 pm/°C) to a commercial OSA (6.32 pm/°C).
Direct data processing achieved a sensitivity of 0.44 μm/°C based on the spatial shift of FBG spectra.
A deep neural network achieved a temperature resolution of 0.1 °C (60-120 °C), significantly outperforming direct valley detection (7.84 °C).

Conclusions:

The proposed WSL-camera hardware and data processing methods offer a compact, practical, and low-cost solution for FBG interrogation.
This technology has the potential to significantly reduce the cost and complexity of FBG sensor systems.
The developed system paves the way for broader applications of FBG sensors in various fields.