Abstract
An all-fiber magnetic field sensor by using a TbDyFe rod as the sensing element for the measurement of the weak alternating magnetic field is presented and experimentally demonstrated. The sensor is constructed with a 3 × 3 coupler based Mach-Zehnder interferometer, and the time-varying phase shift induced by the applied magnetic field is recovered by using a passive demodulation method. The experimental results show that the sensor exhibits excellent linearity and reversibility within 0-75 μT (residual mean square), and a high sensitivity of 69.83 mrad/μT (residual mean square) with a resolution of 2.14 nT/√Hz (residual mean square) at 200 Hz is experimentally achieved. The frequency response and the temperature characteristic of the sensor are also investigated.
| Original language | English |
|---|---|
| Pages (from-to) | 2085-2090 |
| Number of pages | 6 |
| Journal | Applied Optics |
| Volume | 54 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 10 Mar 2015 |