Miniature high sensitive pH sensor based on micro optical fiber interferometer
A biocompatible pH sensor based on a Mach-Zehnder is proposed with the structure of SMF-TCF-SMF with a taper on the TCF portion. The sensor is then coated with PVA/PAA hydrogel which swells reversibly in response to changes to pH, which leads to a change of refractive index which translate to shifti...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/72082 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A biocompatible pH sensor based on a Mach-Zehnder is proposed with the structure of SMF-TCF-SMF with a taper on the TCF portion. The sensor is then coated with PVA/PAA hydrogel which swells reversibly in response to changes to pH, which leads to a change of refractive index which translate to shifting interference dips in the optical spectrum analyzer. The proposed sensor has limited success with a sensitivity of 0.73449 and R2= 0.8947. The range of sensitivity was between pH 2 to 4.2. |
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