An optical sensor with wide measurement range for the magnetic field detection

Electromagnetic pollution is a major challenge, as it has brought inevitable damage to the environment and human health. Monitoring of electromagnetic radiation is critical to identifying electromagnetic pollution for treatment. Conventional monitoring devices could produce a large number of waste batteries causing pollution. Optical fiber sensing with characteristic of passive detection is an efficient way to monitor electromagnetic field intensity. However, previously reported measurement range of optical fiber magnetic field sensors are rare to achieve a wide range of magnetic field measurement. In this work, we propose a passive optical fiber magnetic field measurement scenario. The measurement range from 0 to 100 mT and a resolution of 2.9 × 10−2 mT for DC magnetic field detection are obtained. Also, both exceptional orientation dependence property and the sensitivity of 341 pm/mT have been achieved. This passive optical fiber magnetic field sensor with wide range and anti-electromagnetic interference has excellent prospects for application in the electromagnetic pollution monitoring, power equipment assessment and geological exploration.