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Open AccessArticle

Recent Improvement of Medical Optical Fibre Pressure and Temperature Sensors

Optical Fibre Sensors Research Centre-University of Limerick, Limerick MS1019, Ireland
Nanophotonics Research Laboratory, Cyprus University of Technology, Lemesos 3036, Cyprus
University of Limerick, Chemical & Environmental Science, Limerick MS1019, Ireland
Author to whom correspondence should be addressed.
Academic Editor: Yuliya Semenova
Biosensors 2015, 5(3), 432-449;
Received: 4 June 2015 / Revised: 1 July 2015 / Accepted: 2 July 2015 / Published: 13 July 2015
(This article belongs to the Special Issue Optical Sensors for Biomedical Applications)
This investigation describes a detailed analysis of the fabrication and testing of optical fibre pressure and temperature sensors (OFPTS). The optical sensor of this research is based on an extrinsic Fabry–Perot interferometer (EFPI) with integrated fibre Bragg grating (FBG) for simultaneous pressure and temperature measurements. The sensor is fabricated exclusively in glass and with a small diameter of 0.2 mm, making it suitable for volume-restricted bio-medical applications. Diaphragm shrinking techniques based on polishing, hydrofluoric (HF) acid and femtosecond (FS) laser micro-machining are described and analysed. The presented sensors were examined carefully and demonstrated a pressure sensitivity in the range of \(s_p\) = 2–10 \(\frac{\text{nm}}{\text{kPa}}\) and a resolution of better than \(\Delta P\) = 10 Pa protect (0.1 cm H\(_2\)O). A static pressure test in 38 cmH\(_2\)O shows no drift of the sensor in a six-day period. Additionally, a dynamic pressure analysis demonstrated that the OFPTS never exceeded a drift of more than 130 Pa (1.3 cm H\(_2\)O) in a 12-h measurement, carried out in a cardiovascular simulator. The temperature sensitivity is given by \(k=10.7\) \(\frac{\text{pm}}{\text{K}}\), which results in a temperature resolution of better than \(\Delta T\) = 0.1 K. Since the temperature sensing element is placed close to the pressure sensing element, the pressure sensor is insensitive to temperature changes. View Full-Text
Keywords: optical fibre sensors; Fabry–Perot interferometer; pressure sensors optical fibre sensors; Fabry–Perot interferometer; pressure sensors
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Poeggel, S.; Duraibabu, D.; Kalli, K.; Leen, G.; Dooly, G.; Lewis, E.; Kelly, J.; Munroe, M. Recent Improvement of Medical Optical Fibre Pressure and Temperature Sensors. Biosensors 2015, 5, 432-449.

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