Magnetic Field and Temperature Two-Parameter Sensor Based on MachZehnder Interferometer and Faraday Rotation Effect

A novel combination of structural design and sensing theory is proposed for an optical fiber magnetic field and temperature two-parameter sensor based on the Mach-Zehnder interferometer (MZI) and Faraday rotation effect. The sensor structure includes a polydimethylsiloxane (PDMS) microcavity and a small section of offset spliced fiber. Numerical analysis shows that the sensor exhibits high-temperature sensitivity, which has been experimentally verified. The sensor has a temperature sensitivity of -846 pm/degrees C in the 20 degrees C to 35 degrees C and a magnetic field intensity sensitivity of 190 pm/Gs in the range of 0-150 Gs. The temperature and magnetic field intensity responses of the sensor are linear and have been optimized for sensitivity demodulation. The sensor is well-suited for standardized monitoring of temperature and magnetic field in applications requiring accurate measurements.

Automated summary

A novel combination of structural design and sensing theory is proposed for an optical fiber sensor based on the Mach-Zehnder interferometer (MZI) and Faraday rotation effect, which can measure both magnetic field and temperature. The sensor demonstrates high temperature sensitivity, as confirmed by experimental verification. The temperature sensitivity of the sensor is -846 pm/°C within a range of 20°C to 35°C, and the magnetic field intensity sensitivity is 190 pm/Gs within a range of 0-150 Gs. The sensor's temperature and magnetic field intensity responses are linear and optimized for sensitivity demodulation. It is well-suited for standardized monitoring of temperature and magnetic field in applications requiring accurate measurements.