Li, YL;
Barker, PF;
(2018)
Field Evaluation of a Portable Whispering Gallery Mode Accelerometer.
Sensors
, 18
(12)
, Article 4184. 10.3390/s18124184.
Preview |
Text
sensors-18-04184.pdf - Published Version Download (3MB) | Preview |
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.
| Type: | Article |
|---|---|
| Title: | Field Evaluation of a Portable Whispering Gallery Mode Accelerometer |
| Location: | Switzerland |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3390/s18124184 |
| Publisher version: | https://doi.org/10.3390/s18124184 |
| Language: | English |
| Additional information: | This is an open access article distributed under the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). |
| Keywords: | accelerometer, cavity, field trial, optical sensing, optical sensors, optomechanics, prototype, resonator, whispering gallery mode |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10064613 |
Archive Staff Only
 |
View Item |
