Fiber optic interferometer sensor for responsive hydrogel based heavy metal cation detection
This project objective aimed to fuse a Mach-Zehnder type interferometer and using the hydrogel volume phase transition theory to measure the refractive index dependence due to the heavy metal concentration. The refractive index sensor was made by splicing a three centimeter photonic crys...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/60243 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | This project objective aimed to fuse a Mach-Zehnder type interferometer and
using the hydrogel volume phase transition theory to measure the refractive index
dependence due to the heavy metal concentration. The refractive index sensor was
made by splicing a three centimeter photonic crystal fiber (PCF) and placing it in
between two single mode fibers. To allow the coupling of various modes, the air
holes of PCF must be fully collapsed at the spliced region. The hydrogel will be
coated onto the PCF interferometer via dipping into it. The copolymerizing of both
polyacrylic acid with polyvinyl alcohol and cross-linkers incorporated epoxy groups
as molecular recognition agents for 5-amino-8-hydroxyquinoline. The heavy metal
cation will induced hydrogel to swell and shrink according to the RI changes, and can
be transduced to an optical signal using an interferometric optical fiber sensor. |
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