Field Evaluation of a Portable Whispering Gallery Mode Accelerometer.
Sensors (Basel)
; 18(12)2018 Nov 29.
Article
em En
| MEDLINE
| ID: mdl-30501064
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 2â»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.
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MEDLINE
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En
Ano de publicação:
2018
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Article