Towards Development of a Simple Technique Based on Wavelength Specific Absorption for Quality Measurement of Flowing Water

Nayeem, Huzaifa and Syed, Azeemuddin and Khan, Mohammed Zafar Ali (2020) Towards Development of a Simple Technique Based on Wavelength Specific Absorption for Quality Measurement of Flowing Water. IEEE Sensors Journal, 20 (24). pp. 14780-14790. ISSN 1530-437X

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Water quality assessment has undeniable value for humanity's well-being. Despite that, most of the existing techniques struggle to measure the quality of running water due to costly infrastructure or large evaluation time. Recently, quality measurement has been demonstrated using spectrum analysis. However, these modern systems need complicated signal processing algorithms and high processor capabilities for decision making, have elaborate optical assemblies and sizable power requirement making them bulky and expensive to operate. Thus, a refined technique with simplified implementation, low cost, and reliable long-time operation is essential to address this challenge. We present, for the first time to our knowledge, a holistic approach towards a simple and rapid method for determination of water quality parameters in flowing water. This is based on the selection of characteristic wavelengths for the parameters considered and usage of narrowband LEDs as the inspection light source. Thereby incorporating the benefits of optical sensing such as electromagnetic immunity, selectivity, sensitivity, etc. The specific wavelengths of 560nm, 860nm, and 635nm have been demonstrated to have a dominant effect due to pH, turbidity, and total dissolved solids (TDS) respectively, from regression analysis. Using only these wavelengths, an evaluation system capable of determining the light absorption after passing through water has been designed and developed. The obtained optical responses are subsequently related to water parameters, specifically pH, TDS, and turbidity. Experiments were performed to evaluate samples and then validate this technique against standard instruments for both flowing and sampled water setups. It is shown from the measurement results that pH, turbidity, and TDS have linear regression coefficients of 0.9773, 0.9617, 0.8271 and 0.9691, 0.9729, 0.76 for flowing and sampled water arrangements, respectively.

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IITH Creators:
IITH CreatorsORCiD
Nayeem, HuzaifaUNSPECIFIED
Syed, AzeemuddinUNSPECIFIED
Khan, Mohammed Zafar AliUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Electromagnetic immunity; Linear regression coefficients; Long-time operation; Quality measurements; Signal processing algorithms; Total dissolved solids; Water quality assessments; Water quality parameters
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 15 Jul 2021 07:32
Last Modified: 15 Jul 2021 07:32
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