Fibre optic systems for gas detection principals, progress and prospects

Brian Culshaw

doi:10.1117/12.884483

2 November 2010 Fibre optic systems for gas detection principals, progress and prospects

Brian Culshaw

Proceedings Volume 7853, Advanced Sensor Systems and Applications IV; 785302 (2010) https://doi.org/10.1117/12.884483
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

Gas sensing is evolving into an important application contributing particularly to environmental and safety monitoring. Fibre optic sensing will have an important role to play as the need for gas measurements increase. This paper seeks to overview of the optical techniques which are compatible with fibre optic technology and present a limited snapshot of the applications. Fibre optic techniques offer intrinsic safety, reliability and very long interrogation distances over the fibre link together with prospects for highly multiplexed and distributed systems. There are two basic approaches for fibre sensing targeted at gas measurements. The first involves some intermediate compound in contact with the end of the fibre (or deposited along the fibre) whose optical properties change with the presence of the gas of interest, usually measured spectroscopically. The second involves direct absorption spectroscopy typically in the near infrared. Former techniques are invariably responsive to a number of gas species and are usually difficult to calibrate accurately. The latter techniques are highly gas specific and can be accurately calibrated. However both approaches have their application sectors depending upon particular measurement requirements. The paper presents a brief overview of the principles of both these techniques and analyses some of their applications.

Citation Download Citation

Brian Culshaw "Fibre optic systems for gas detection principals, progress and prospects", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 785302 (2 November 2010); https://doi.org/10.1117/12.884483

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