Water quality performance analysis using fiber optic sensor based on lateral offset displacement for agricultural application

Azman, Noor Erina (2021) Water quality performance analysis using fiber optic sensor based on lateral offset displacement for agricultural application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Agricultural activities have played the most significant role in economic's growth which one of the activities is the hydroponic crop system. In this paper, a compact and sensitive fiber optic sensor based on a lateral offset displacement sensor is formed and demonstrated in measuring the water quality of the hydroponic crop system. The fiber is designed in SM-SM and MM-MM fiber mode configuration with a lateral offset structure. The fiber's core has been spliced in various offset distances, which act as a sensing region of the fiber sensor towards the pH and temperature. Upon completion, the sensitivity obtained for SM-SM based on lateral offset is -0.5744 dBm/pH and the -0.1432 dBm/°C that obtained for pH and temperature measurement where the offset distance is 18.72μm, meanwhile for the MM-MM based on lateral offset, the sensitivity is -0.8322 dBm/pH and -0.1645 dBm/°C for the pH and temperature measurement, where the offset distance is 7.83μm. The fiber sensor has successfully developed and used the sensor to measure the pH and temperature of the water quality.

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