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• W3100800765 abstract "Navigation, biotracking devices, and gravity gradiometry are among the diverse range of applications requiring ultrasensitive measurements of acceleration. We describe an accelerometer that exploits the dispersive and dissipative coupling of the motion of an optical whispering gallery mode (WGM) resonator to a waveguide. A silica microsphere-cantilever is used as both the optical cavity and inertial test-mass. Deflections of the cantilever in response to acceleration alter the evanescent coupling between the microsphere and the waveguide, in turn, causing a measurable frequency shift and broadening of the WGM resonance. The theory of this optomechanical response is outlined. By extracting the dispersive and dissipative optomechanical rates from data, we find good agreement between our model and sensor response. A noise density of 4.5 μg·Hz <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-1/2</sup> with a bias instability of 31.8 μg (g = 9.81 m·s <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-2</sup> ) is measured, limited by classical noise larger than the test-mass thermal motion. Closed-loop feedback is demonstrated to reduce the bias instability and long-term drift. Currently, this sensor outperforms both commercial accelerometers used for navigation and those in ballistocardiology for monitoring blood flowing into the heart. Furthermore, optimization would enable short-range gravitational force detection with operation beyond the lab for terrestrial or space gradiometry." @default.
• W3100800765 created "2020-11-23" @default.
• W3100800765 creator A5047595889 @default.
• W3100800765 creator A5069961743 @default.
• W3100800765 date "2018-09-15" @default.
• W3100800765 modified "2023-10-15" @default.
• W3100800765 title "Characterization and Testing of a Micro-g Whispering Gallery Mode Optomechanical Accelerometer" @default.
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• W3100800765 doi "https://doi.org/10.1109/jlt.2018.2853984" @default.
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