| Abstract Scope |
The development of a distributed magnetic sensor has great potential in corrosion and structural health monitoring, ferromagnetic object detection, and downhole applications. Fiber optic distributed acoustic sensing (DAS) has garnered significant attention in recent years for its high strain sensitivity and ability to take measurements across kilometers worth of fiber in harsh environments. Coupling existing DAS technology with highly magnetostrictive materials allows for small scale magnetic field detection while maintaining the advantages of DAS fiber optics. In our group’s existing work, AC magnetic fields have been detected with single nanotesla amplitudes using this technique. However, due to the dynamic nature of interrogators for this kind of strain detection, static magnetic fields are more difficult to characterize. This talk will investigate measuring static fields with nanotesla sensitivity by manipulating magnetostrictive material behavior detected via DAS optical fiber. The development of the technology and its applications will be discussed. |