Temperature insensitive magnetic field sensor based on an etched TCFMI cascaded with a FBG

Guofeng Yan; Liang Zhang; Sailing He

doi:10.1117/12.2193536

10 August 2015 Temperature insensitive magnetic field sensor based on an etched TCFMI cascaded with a FBG

Guofeng Yan, Liang Zhang, Sailing He

Proceedings Volume 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 96200I (2015) https://doi.org/10.1117/12.2193536
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

In this paper, a dual-parameter measurement scheme based on an etched thin core fiber modal interferometer (TCMI) cascaded with a fiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement of magnetic field and temperature. The magnetic fluid cladding surrounding the TCFMI was used as a magnetic field-to-refractive index transducer. To depress the temperature influence on the performance of such sensors, an FBG was inscribed in the leading SMF of the TCFMI. Experimental results show that, the reflection of the FBG has a magnetic field intensity and temperature sensitivities of -0.017 dB/Oe and 0.133 dB/℃, respectively, while the Bragg wavelength of the FBG only has a temperature sensitivity of 13.23 pm/℃. By monitoring the reflection wavelength and intensity of the Bragg mode, the intensity of the magnetic field and the temperature variance can be measured, which enables magnetic field sensing under strict temperature environments. Meanwhile the reflective sensing probe is more compact and practical for applications in hard-to-reach conditions.

Citation Download Citation

Guofeng Yan, Liang Zhang, and Sailing He "Temperature insensitive magnetic field sensor based on an etched TCFMI cascaded with a FBG", Proc. SPIE 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 96200I (10 August 2015); https://doi.org/10.1117/12.2193536

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KEYWORDS

Magnetism

Fiber Bragg gratings

Magnetic sensors

Temperature metrology

Cladding

Sensors

Single mode fibers

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