Temperature-compensated DC magnetic field sensor based upon a microcapillary resonator

Abstract

A temperature-compensated direct current (DC) magnetic field sensor based on a whispering gallery mode (WGM) microcapillary resonator is described in which both temperature-compensation and magnetic field sensing is realized by resonant wavelength difference in two high-order modes. A simulation and experimental results verified that the temperature response of the sensor is significantly reduced using the resonant wavelength difference between two high-order optical modes. In addition, the magnetic field response of resonant wavelength difference between two high-order optical modes was characterized. The results show that the resonant wavelength difference first blue-shifted and subsequently red-shifted as the magnetic field strength increased to provide DC magnetic field sensitivities of −0.03 and 0.01 pm/Oe from 34.79 to 62.56 Oe and 62.56 to 181.012 Oe, respectively. This temperature-compensated DC magnetic field sensor is anticipated to applications for current and rotation angle detection.

Keywords:

• Magnetic field sensing
• temperature-compensation
• whispering gallery mode resonator

Disclosure statement

The authors declare no conflicts of interest.

Additional information

Funding

This work was supported by the “Pioneer” and “Leading Goose” R&D Program of Zhejiang Province (Grant 2022C01053), the National Key Research and Development Program (Grants 2022YFF1400100), the National Natural Science Foundation of China (Grants 11874135, 12004090), the Key Research and Development Program of Zhejiang Province (Grants 2021C01039), and the Natural Science Foundation of Zhejiang Province, China (Grants KYZ044123050CZ, LQ20F040005, LQ21A050001, LY20F050009).