Field Evaluation of a Portable Whispering Gallery Mode Accelerometer
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2018
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Abstract
An accelerometer utilising the optomechanical coupling between an optical whispering gallery mode (WGM) resonance and the motion of the WGM cavity itself was prototyped and field-tested on a vehicle. We describe the assembly of this portable, battery operated sensor and the field-programmable gate array automation. Pre-trial testing using an electrodynamic shaker demonstrated linear scale-factors with <0.3% standard deviation ( ± 6 g range where g = 9.81 ms − 2 ), and a strong normalised cross-correlation coefficient (NCCC) of r ICP / WGM = 0.997 when compared with an integrated circuit piezoelectric (ICP) accelerometer. A noise density of 40 μ g Hz − 1 / 2 was obtained for frequencies of 2–7 kHz, increasing to 130 μ g Hz − 1 / 2 at 200 Hz, and 250 μ g Hz − 1 / 2 at 100 Hz. A reduction in the cross-correlation was found during the trial, r ICP / WGM = 0.36, which we attribute to thermal fluctuations, mounting differences, and the noisy vehicle environment. The deployment of this hand-fabricated sensor, shown to operate and survive during ±60 g shocks, demonstrates important steps towards the development of a chip-scale device.| Reference Key |
li2018sensorsfield
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| Authors | Ying Lia Li;P. F. Barker;Li, Ying Lia;Barker, P. F.; |
| Journal | sensors |
| Year | 2018 |
| DOI | 10.3390/s18124184 |
| URL | |
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