A compact low-frequency optomechanical triaxial inertial sensor

Daniel George; Jose D. Hernandez Rivero; Moritz Mehmet; Ramses Miranda Espino; Xiangyu Guo; Andrea Nelson; Jose Sanjuan; Felipe Guzman

arXiv · 2608.18247

A compact low-frequency optomechanical triaxial inertial sensor

Daniel George·Jose D. Hernandez Rivero·Moritz Mehmet·Ramses Miranda Espino·Xiangyu Guo·Andrea Nelson·Jose Sanjuan·Felipe Guzman

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Abstract

Triaxial optomechanical accelerometers offer compact, ground-testable alternatives to electrostatic sensors for satellite geodesy, seismometry, and various other applications. We demonstrate a low-CSWaP triaxial sensor using monolithic fused-silica resonators with dual heterodyne interferometric readout. The X axis reaches a 60~pico-g/$\sqrt{\mathrm{Hz}}$ readout noise floor, and the in-plane axes resolve ambient seismic ground motion in agreement with a co-located commercial seismometer from 4~mHz to 8~Hz. The Z axis exhibits higher noise under $1g$ loading due to gravity-induced geometric stiffening (44.45~Hz versus 11.07~Hz in a 0g-equivalent configuration), with measurements indicating in-orbit performance on par with the in-plane sensors. These results support the feasibility of triaxial optomechanical accelerometry for space missions and ground-based applications.

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Daniel George, Jose D. Hernandez Rivero, Moritz Mehmet, Ramses Miranda Espino, Xiangyu Guo, Andrea Nelson, Jose Sanjuan, Felipe Guzman. 2026-08-18. A compact low-frequency optomechanical triaxial inertial sensor. https://arxiv.org/abs/2608.18247

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