Magnetic field and temperature sensor based on a no-core fiber combined with a fiber Bragg grating

• An optical fiber magnetic field and temperature sensor is firstly proposed.
• Simultaneous measurement of magnetic field and temperature is achieved.
• The related theory is explained and the experiment results are analyzed.
• The sensor is of low fabrication cost and simple configuration.

An optical fiber magnetic field sensor based on the no-core fiber (NCF) and magnetic fluid (MF) is proposed and demonstrated. By using the temperature sensing property of fiber Bragg grating (FBG), the magnetic field sensor with dynamic temperature compensation can be achieved. The transmittance of the NCF that is sealed in a capillary with MF is highly sensitive to the surrounding magnetic field. Experimental results show that the sensor has the magnetic field sensitivity of 9.2 pm/mT ranging from 0 to 9 mT and the temperature sensitivity of 11.9 pm/°C ranging from 15 to 45 °C. The prototype might be attractive due to its low fabrication cost and simple configuration, which are desirable features in magnetic field measurement.