A high sensitivity long period grating Mach-Zehnder refractometer

Allsop, Thomas D.P., Webb, D.J. and Bennion, I. (2002). A high sensitivity long period grating Mach-Zehnder refractometer. IN: 15th Optical Fiber Sensors conference technical digest, 2002. IEEE.


A refractive index sensing system has been demonstrated, which is based upon an in-line fibre long period grating Mach-Zehnder interferometer with a heterodyne interrogation technique. This sensing system has comparable accuracy to laboratory-based techniques used in industry such as high performance liquid chromatography and UV spectroscopy. The advantage of this system is that measurements can be made in-situ for applications in continuous process control. Compared to other refractive index sensing schemes using LPGs, this approach has two main advantages. Firstly, the system relies on a simple optical interrogation system and therefore has the real potential for being low cost, and secondly, so far as we are aware it provides the highest refractive index resolution reported for any fibre LPG device.

Publication DOI: https://doi.org/10.1109/OFS.2002.1000517
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
Event Title: 15th conference on Optical Fibre Sensors
Event Type: Other
Event Dates: 2002-05-10
Full Text Link: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1000517
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Published Date: 2002
Authors: Allsop, Thomas D.P.
Webb, D.J. ( 0000-0002-5495-1296)
Bennion, I.

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