Development of Light Dependent Resistor (LDR) sensor in detergent for different concentractions using LED detection

Alia, Natasya Najwa (2025) Development of Light Dependent Resistor (LDR) sensor in detergent for different concentractions using LED detection. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A system and medium for sending data as light pulses over a glass or plastic strand is known as fiber optics, or optical fiber. Total internal reflection is the term for the phenomenon where light signals bounce off the core of a fiber optic cable while being transmitted. Because of their high sensitivity, quick detection, and adaptability to harsh environments, optical microfiber sensors have attracted a lot of research attention recently. The goal of this project was to develop a Light Dependent Resistor (LDR) sensor for liquid detergent at various concentrations using microfiber optics and LED detection. The best size of microfiber optics will be used for additional research as a liquid sensor after the single mode fiber has been tapered using the tapering method. Additionally, tests will be conducted on the three samples containing varying concentrations of liquid detergent. The fiber would be measured and dipped in the samples prior to each test. As a result, the outcomes of every measurement would vary. The results of the experiment will be discussed in terms of the graph's sensitivity, correlation, and coefficient of determination, all of which are entirely dependent on the concentration of liquid detergent and light source.

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