Magnetic field and temperature two-parameter sensor based on optical microfiber coupler interference (OMCI) wrapped...

Area of Science:

• Optoelectronics
• Fiber Optic Sensors
• Materials Science

Background:

• Accurate simultaneous measurement of magnetic fields and temperature is crucial in various scientific and industrial applications.
• Existing sensors often face challenges with cross-sensitivity and limited performance.
• Optical microfiber couplers (OMCs) offer a promising platform for developing compact and sensitive sensors.

Purpose of the Study:

• To propose and experimentally validate a novel optical fiber sensor for simultaneous measurement of magnetic field and temperature.
• To analyze the sensing characteristics and optimize the performance of the proposed sensor.
• To address and overcome the cross-sensitivity between magnetic field and temperature measurements.

Main Methods:

• Fabrication of an optical microfiber coupler (OMC) sensor.
• Encapsulation of the OMC with Polydimethylsiloxane (PDMS) and magnetic fluid (MF) as the sensing medium.
• Theoretical analysis and experimental verification of magnetic field and temperature sensing.
• Establishment and demodulation of a sensitivity matrix to resolve cross-sensitivity.

Main Results:

• The sensor demonstrated high sensitivity to magnetic fields (up to 96.8 pm/Oe) and temperature (up to 919.1 pm/°C).
• A sensitivity matrix was successfully established and demodulated to overcome cross-sensitivity.
• Optimization of the PDMS package size and OMC structure was discussed for enhanced performance.

Conclusions:

• The proposed optical fiber sensor offers a high-sensitivity, low-cost, and integrated solution for dual-parameter sensing.
• This technology holds significant potential for multi-parameter sensing of fundamental physical quantities.
• Further optimization of sensor design can lead to improved performance for advanced applications.