This thesis proposes a light-weight, compact, and accurate optical micro-seismometer that could be used in many applications, such as planetary exploration. The sensor proposed here is based on the principle of whispering gallery optical mode (WGM) resonance shifts of a dielectric micro-resonator due to disturbances of its evanescent field. The micro-seismometer could be used in place of the traditional bulky seismometers. The design of a waveguide-resonator and mechanical structure to disturb the evanescent field are presented. A proof-of-concept a seismometer model that uses a 5µm ring resonator is numerically tested with actual seismic data. The results show that a WGM-based optical micro-seismometer may be feasible.
M. Volkan Otugen
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Da Silva, Jaime, "Optical Micro-Seismometer Based on Evanescent Field Perturbation of Whispering Gallery Modes" (2018). Mechanical Engineering Research Theses and Dissertations. 11.