A high sensitivity long period grating Mach-Zehnder refractometer

Thomas D.P. Allsop, D.J. Webb, I. Bennion

Research output: Chapter in Book/Published conference outputConference publication


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.
Original languageEnglish
Title of host publication15th Optical Fiber Sensors conference technical digest, 2002
Number of pages4
ISBN (Print)0-7803-7289-1
Publication statusPublished - 2002
Event15th conference on Optical Fibre Sensors - Portland, Oregon, United States
Duration: 10 May 2002 → …


Conference15th conference on Optical Fibre Sensors
Abbreviated titleOFS 2002
Country/TerritoryUnited States
CityPortland, Oregon
Period10/05/02 → …


Dive into the research topics of 'A high sensitivity long period grating Mach-Zehnder refractometer'. Together they form a unique fingerprint.

Cite this