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

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Fiber-MZI-based FBG sensor interrogation: comparative study with a CCD spectrometer.

Bhargab Das, Vikash Chandra

|November 10, 2016

Summary

This summary is machine-generated.

Modern charge-coupled device (CCD) spectrometers offer performance comparable to fiber Mach-Zehnder interferometers (F-MZI) for fiber Bragg grating (FBG) sensing. This study guides FBG sensor selection for precise, small-amplitude dynamic strain measurements.

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Last Updated: Mar 12, 2026

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: September 30, 2019

Area of Science:

Optoelectronics
Sensor Technology
Photonics

Background:

Fiber Bragg Grating (FBG) sensors are widely used for various measurements.
Interrogation techniques determine how FBG sensor data is extracted.
Charge-coupled device (CCD) spectrometers and fiber Mach-Zehnder interferometers (F-MZI) are common interrogation methods.

Purpose of the Study:

To experimentally compare the performance of CCD spectrometer and F-MZI interrogation techniques for FBG sensors.
To evaluate their suitability for high-sensitivity, small-amplitude dynamic strain measurements.
To provide guidance for selecting appropriate FBG interrogation methods.

Main Methods:

Experimental setup comparing a CCD spectrometer and an F-MZI interrogator.
Measurement of Bragg wavelength shifts with high accuracy.
Analysis of sensor performance for dynamic perturbations.

Main Results:

Modern CCD spectrometers achieve performance nearly equivalent to F-MZI interrogators.
Both techniques demonstrated sub-picometer-level accuracy in measuring Bragg wavelength shifts.
The study establishes comparable capabilities for detecting nano-level strain.

Conclusions:

CCD spectrometers are a viable and high-performance alternative to F-MZI for FBG sensor interrogation.
The findings offer practical guidelines for selecting FBG interrogation systems for sensitive dynamic measurements.
Sub-picometer accuracy is achievable with current CCD spectrometer technology.