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High Sensitivity Microfiber Interferometer Sensor in Aqueous Solution
Saad Hayatu Girei1, Hong Ngee Lim2, Muhammad Zamharir Ahmad3
1Wireless and Photonics Networks Research Centre, University Putra Malaysia, Serdang 43400, Selangor, Malaysia.
Sensors (Basel, Switzerland)
|August 23, 2020
Summary
A novel microfiber interferometer sensor effectively monitors ammonia nitrogen in water. This optical fiber sensor achieves high sensitivity for environmental water quality assessment.
Area of Science:
- Optical sensing
- Environmental monitoring
- Fiber optics
Background:
- Ammonia nitrogen is a key water quality indicator.
- Environmental protection necessitates accurate pollutant detection.
- Tapered microfiber interferometers (MFI) offer a promising sensing platform.
Discussion:
- A high-sensitivity MFI sensor was developed for ammonia nitrogen detection.
- A supercontinuum laser provided a broad wavelength range (1500-1800 nm) for evaluation.
- The sensor demonstrated optimal performance at 1785 nm, showing a sensitivity of 0.099 nm/ppm.
Key Insights:
- The MFI sensor exhibits linear response for ammonia nitrogen concentrations from 5-30 ppm.
- A measurement resolution of 0.5 ppm was achieved.
- The sensor successfully detected low concentrations of ammonia nitrogen in the infrared region.
Outlook:
- This optical fiber sensor shows potential for real-time rivers and drinking water monitoring.
- Further research can explore enhanced sensitivity and broader concentration ranges.
- Integration into portable monitoring systems could expand its applicability.
