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Galvanometer

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...

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AC Magnetometry Using Nano-ferrofluid Cladded Multimode Interferometric Fiber Optic Sensors for Power Grid Monitoring

Dolendra Karki¹, Tulika Khanikar¹, Suraj V Mullurkara¹

¹Mechanical Engineering & Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.

ACS Applied Nano Materials

|December 19, 2024

Summary

This study demonstrates high-frequency AC magnetic field sensing using nano-ferrofluids in fiber-optic sensors. Optimized nano-ferrofluids enable rapid response times for real-time electrical grid monitoring.

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Published on: September 30, 2019

Area of Science:

* Nanotechnology and Materials Science
* Fiber Optics and Photonics
* Sensor Technology

Background:

* Superparamagnetic nano-ferrofluids exhibit AC magnetic field response governed by Neel and Brownian relaxation.
* High-frequency response is crucial for equilibrium state in time-varying magnetic fields.
* Optical AC magnetic field sensing using nano-ferrofluids in fiber optics remains largely unexplored, with limitations cited due to response times.

Purpose of the Study:

* To investigate the high-frequency AC magnetic field sensing capability of nano-ferrofluids.
* To develop and optimize a fiber-optic multimode interferometry (MMI) sensor utilizing nano-ferrofluid cladding.
* To assess the sensor's efficacy in monitoring current and current-induced magnetic fields in electrical power systems.

Main Methods:

* Employed a fiber-optic multimode interferometry (MMI) structure optimized for the fourth self-imaging spectral response.
* Utilized superparamagnetic nano-ferrofluid as the cladding material.
* Optimized both the sensing structure and nano-ferrofluid solution to achieve response times under 1 ms.
* Tested sensor performance using 60 Hz AC magnetic and current fields.

Main Results:

* Demonstrated high-frequency (up to 15 kHz) AC magnetic field sensing capability.
* Achieved a magnetic field sensitivity of 240 mV/Gauss per dBm for a 60 Hz field.
* Measured a 60 Hz AC current sensitivity of 2.83 mV/A.
* Validated the sensor's potential for metering and monitoring in electrical power grid systems.

Conclusions:

* Nano-ferrofluids can be effectively utilized for high-frequency AC magnetic field sensing in fiber-optic sensors.
* Optimized MMI structures and nano-ferrofluid solutions overcome previous response time limitations.
* The developed sensor shows promise for real-time monitoring applications in the electrical power industry.