Imperial College London
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ProfessorAndrewHolmes

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor of Microelectromechanical Systems
 
 
 
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Contact

 

+44 (0)20 7594 6239a.holmes Website

 
 
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Assistant

 

Ms Susan Brace +44 (0)20 7594 6215

 
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Location

 

701Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Davies:2014:10.1109/JPHOT.2014.2326652,
author = {Davies, E and George, DS and Holmes, AS},
doi = {10.1109/JPHOT.2014.2326652},
journal = {IEEE Photonics Journal},
pages = {1--1},
title = {Remote photothermal actuation for calibration of in-phase and quadrature readout in a mechanically amplified Fabry-Pérot accelerometer},
url = {http://dx.doi.org/10.1109/JPHOT.2014.2326652},
volume = {6},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A mechanically amplified Fabry-Perot optical accelerometer is reported in which photothermal actuation is used to calibrate the in-phase and quadrature (I&Q) readout. The Fabry-Perot interferometer (FPI) is formed between a gold-coated silicon mirror, situated in the middle of a V-beam amplifier, and the end surface of a cleaved optical fiber. On the opposite side of the silicon mirror, a further cleaved optical fiber transmits near-infrared laser light (λ = 785 nm), which is absorbed by the uncoated silicon causing heating. The thermal expansion of the V-beam is translated into an amplified change in cavity length of the FPI, large enough for the 2π-phase variation necessary for I&Q calibration. A simple 1D thermal analysis of the structure has been developed to predict the relationship between laser power and change in cavity length. A device having a V-beam of length 1.8 mm, width 20 μm, and angle 2 ° was found to undergo a cavity length change of 785 nm at 30 mW input power. The device response was approximately linear for input accelerations from 0.01 to 15 g. The noise was measured to be ~ 60 μg/√Hz from 100 Hz to 3.0 kHz, whereas the limit of detection was 47.7 mg from dc to 3.0 kHz.
AU  - Davies,E
AU  - George,DS
AU  - Holmes,AS
DO  - 10.1109/JPHOT.2014.2326652
EP  - 1
PY  - 2014///
SN  - 1943-0647
SP  - 1
TI  - Remote photothermal actuation for calibration of in-phase and quadrature readout in a mechanically amplified Fabry-Pérot accelerometer
T2  - IEEE Photonics Journal
UR  - http://dx.doi.org/10.1109/JPHOT.2014.2326652
UR  - https://ieeexplore.ieee.org/document/6823683
UR  - http://hdl.handle.net/10044/1/41250
VL  - 6
ER  -
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