TELKOMNIKA Telecommunication, Computing, Electronics and Control
Optimization of light source wavelength for ammonia detection in water

TELKOMNIKA Telecommunication, Computing, Electronics and Control
Optimization of light source wavelength for ammonia detection in water

Ammonia detection, Optical sensor, Plastic optical fiber

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.

Nurfatihah Che Abd Rashid, Noran Azizan Cholan, Kim Gaik Tay, Afiqah Yaacob, Nazrah Ilyana Sulaiman, Khairulanwar Mokhiri, Nor Hafizah Ngajikin

DOI: 10.12928/TELKOMNIKA.v20i5.24079

Universitas Ahmad Dahlan

October 2022

Sri Wahyuni

ISSN: 1693-6930

http://journal.uad.ac.id/index.php/TELKOMNIKA

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TELKOMNIKA Telecommunication, Computing, Electronics and Control