Non-Intrusive Liquid Level Detection System Using Ultrasound Technology

Ahmad Asyraf, Shari (2008) Non-Intrusive Liquid Level Detection System Using Ultrasound Technology. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Liquid level detection can be achieved in many ways. In order not to adulterate the liquid to be measured, a non-intrusive liquid level detection system is best preferred. This project is exactly aimed to achieve just that where detection of the liquid level is done by applying ultrasound technology where the sensor does not come into physical contact with the liquid. Ultrasonic is a cyclic sound pressure with a frequency greater than the upper limit of human hearing which is around 20 kilohertz (20,000 hertz). This project can be used to determine the level of liquid at any stage in a tank or container. An ultrasonic sensor transmits ultrasonic waves from its sensor head and then receives the ultrasonic waves reflected from an object or liquid. By measuring the length of time it takes for the sonic waves to travel to the target and the reflected waves detected by the sensor again will provide the necessary variables in relation to the position of the target, in this case the level of the liquid. The indicated level can be computed and displayed on an LCD screen or a 7-segment display. The project will take off by first looking into the various methods currently in used for liquid level detection and some comparisons made of their advantages and disadvantages. Ultimately, the project will be a liquid detection system using ultrasound technology to meet the objectives of the proposed project. Another very important aspect this project is very relevant for liquid which may be corrosive, contaminated or hazardous. Non-intrusive liquid level detection system is practical for the industry that involves significantly in liquid measurement and level control.

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