Fiber Optic Magnetic Field Sensor Based on Terfenol-D
Mentor 1
Chiu T. Law
Location
Union Wisconsin Room
Start Date
5-4-2019 1:30 PM
End Date
5-4-2019 3:30 PM
Description
A fiber optic magnetic field sensor based upon the actuation provided by expansion of Terfenol-D in a magnetic field is developed. A light source with wavelength around 1550 nm is sent through the tip of a single mode fiber and its optical power is coupled to the tip of a second single mode optical fiber. Both tips are located inside a block of epoxy resin acting as their guiding interface. The proximity of the two tips, i.e. the gap between them, can be inferred by the optical power transmitting through the second fiber. Preliminary data indicated that the transmitted power was inversely related to the gap size and some sensitivity to an external magnetic field was achieved when one of the fiber tips was mounted on a Terfenol-D piece. However, subsequent trials showed that some additional effects on the coupled power rely on the influence of the capillary tube as an optical cavity and possible fiber misalignments, yielded inconclusive results. Further testing will determine which guiding interface will reduce the fiber misalignment difficulties over greater distances. Additionally, the design of mounting platforms for fiber tips is evaluated for noise reduction.
Fiber Optic Magnetic Field Sensor Based on Terfenol-D
Union Wisconsin Room
A fiber optic magnetic field sensor based upon the actuation provided by expansion of Terfenol-D in a magnetic field is developed. A light source with wavelength around 1550 nm is sent through the tip of a single mode fiber and its optical power is coupled to the tip of a second single mode optical fiber. Both tips are located inside a block of epoxy resin acting as their guiding interface. The proximity of the two tips, i.e. the gap between them, can be inferred by the optical power transmitting through the second fiber. Preliminary data indicated that the transmitted power was inversely related to the gap size and some sensitivity to an external magnetic field was achieved when one of the fiber tips was mounted on a Terfenol-D piece. However, subsequent trials showed that some additional effects on the coupled power rely on the influence of the capillary tube as an optical cavity and possible fiber misalignments, yielded inconclusive results. Further testing will determine which guiding interface will reduce the fiber misalignment difficulties over greater distances. Additionally, the design of mounting platforms for fiber tips is evaluated for noise reduction.
