Research output per year
Research output per year
Wei Zhang, David J. Webb
Research output: Chapter in Book/Published conference output › Conference publication
Controlling the water content within a product has long been required in the chemical processing, agriculture, food storage, paper manufacturing, semiconductor, pharmaceutical and fuel industries. The limitations of water content measurement as an indicator of safety and quality are attributed to differences in the strength with which water associates with other components in the product. Water activity indicates how tightly water is "bound," structurally or chemically, in products. Water absorption introduces changes in the volume and refractive index of poly(methyl methacrylate) PMMA. Therefore for a grating made in PMMA based optical fiber, its wavelength is an indicator of water absorption and PMMA thus can be used as a water activity sensor. In this work we have investigated the performance of a PMMA based optical fiber grating as a water activity sensor in sugar solution, saline solution and Jet A-1 aviation fuel. Samples of sugar solution with sugar concentration from 0 to 8%, saline solution with concentration from 0 to 22%, and dried (10ppm), ambient (39ppm) and wet (68ppm) aviation fuels were used in experiments. The corresponding water activities are measured as 1.0 to 0.99 for sugar solution, 1.0 to 0.86 for saline solution, and 0.15, 0.57 and 1.0 for the aviation fuel samples. The water content in the measured samples ranges from 100% (pure water) to 10 ppm (dried aviation fuel). The PMMA based optical fiber grating exhibits good sensitivity and consistent response, and Bragg wavelength shifts as large as 3.4 nm when the sensor is transferred from dry fuel to wet fuel.
Original language | English |
---|---|
Title of host publication | Micro-structured and specialty optical fibres III |
Editors | Kyriacos Kalli, Alexis Mendez |
Place of Publication | Bellingham, WA (US) |
Publisher | SPIE |
Number of pages | 6 |
ISBN (Print) | 978-1-62841076-1 |
DOIs | |
Publication status | Published - 19 May 2014 |
Event | Micro-structured and specialty optical fibres III - Brussels, Belgium Duration: 14 Apr 2014 → 15 Apr 2014 |
Name | SPIE proceedings |
---|---|
Publisher | SPIE |
Volume | 9128 |
ISSN (Print) | 0277-786X |
Conference | Micro-structured and specialty optical fibres III |
---|---|
Country/Territory | Belgium |
City | Brussels |
Period | 14/04/14 → 15/04/14 |
Research output: Chapter in Book/Published conference output › Conference publication
Research output: Chapter in Book/Published conference output › Conference publication
Research output: Chapter in Book/Published conference output › Conference publication