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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control)
Khairulanwar Mokhiri
Mass Rapid Transit Corporation Sdn. Bhd. (MRT), MRT Sungai Buloh Depot, Jalan Sungai Buloh, U 4, 47810 Petaling Jaya, Selangor, Malaysia
Computer Science & IT

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Optimization of light source wavelength for ammonia detection in water Nurfatihah Che Abd Rashid; Noran Azizan Cholan; Kim Gaik Tay; Afiqah Yaacob; Nazrah Ilyana Sulaiman; Khairulanwar Mokhiri; Nor Hafizah Ngajikin
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 20, No 5: October 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v20i5.24079

Abstract

Optimization of light source wavelength for ammonia detection in surface water is presented in this work. For the ammonia detection, the surface water sample is mixed with sodium chloride and nessler reagent, whereas the sensor head consists of unclad plastic optical fiber. The unclad region has a length of 1 cm and the cladding is removed by immersing it in acetone solution. Experimental results indicate that the output light intensity of the sensor has linear relationship with the ammonia concentration. At the wavelength of 510 nm, the output light increases linearly as the ammonia concentration varies from 0.07 mg/L to 8.97 mg/L. At the same wavelength, the proposed sensor achieves the sensitivity of 0.0139 (mg/L)-1, accuracy of 99.59% and resolution of 0.72 µg/L. The analysis of light source wavelength reveals that a wavelength range from 450 nm to 580 nm produces the optimized performances. Within this wavelength range, the proposed sensor achieves sensitivity of higher than 0.01 (mg/L)-1, accuracy of higher than 99% and resolution of less than 1 µg/L.
Co-Authors Afiqah Yaacob Kim Gaik Tay Nazrah Ilyana Sulaiman Nor Hafizah Ngajikin Noran Azizan Cholan Nurfatihah Che Abd Rashid