Design of optical sensor for water level detection based on fresnel reflection /
Optical fibers are used most often to transmit light between the two ends of the fiber and wide usage in fiber optic communication. The system permits signal transmission over longer distances with a higher bandwidth and data rates in comparison to the conventional electrical based communication sys...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur :
Kulliyyah of Engineering, International Islamic University Malaysia,
2018
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| Subjects: | |
| Online Access: | http://studentrepo.iium.edu.my/handle/123456789/4520 |
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| Summary: | Optical fibers are used most often to transmit light between the two ends of the fiber and wide usage in fiber optic communication. The system permits signal transmission over longer distances with a higher bandwidth and data rates in comparison to the conventional electrical based communication system. In the process of measuring the liquid level, fiber optic sensor is suitable to sense, detect and monitor the measurement. Fresnel-reflection-based fiber optic sensor is capable to become a water level detector mechanism based on the difference of the fiber core refractive index to its end interface with air and water. In this research, Optisystem software is used to simulate the optical power range difference at the receiver side according to the design water level resolution and different branch of a river. At the fiber end sensing point of eight levels, the received power shows a linear power difference of -22.48 dBm to -36.48 dBm between levels for both signal wavelengths 1310 nm and 1550 nm at a fixed fiber length L1. As the fiber length is varied with two different river branches respectively, a total length of 150 km is achieved for 0 dBm signal launch at a transmitter side. OSNR level from 45.52 dBm to 77.52 dBm for both wavelengths at the 150 km transmission length is acceptable for the receiver to determine the power level difference that indicates the water level consequently. The determination of the power level range and transmission length serves as an indicator for the developed water level sensor to be deployed in the diverse structure of drain and river water level monitoring. It is also served for a practical remote river level monitoring mechanism as part of the natural disaster early warning system of any residential or business area along the river that could save the life. |
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| Physical Description: | xiv, 52 leaves : colour illustrations ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves 51-52). |