Kaushik Bukka

Publication Date


Document Type


First Advisor

Tahernezhadi, Mansour

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Electrical Engineering


Engineering; Electrical engineering; Liquid level indicators; Water levels--Measurement; Water towers; Tanks; Radar receiving apparatus


The present research is related to liquid level measurement using a non-contact radar. For this purpose we employ a Mono-Doppler transceiver whose function is to transmit and receive electromagnetic waves. The primary objective of the research is to estimate the height of water level in a tank and to build an efficient measuring device.;"Mono-Doppler transceiver operates as a pulse radar device. It emits pulses of microwaves in a duration of nanoseconds. For this reason the transceiver has high repetition rate. Within very short duration, a received signal is observed, the time delay of the received signal is used to evaluate to the height of water level. An antenna is attached to the transceiver to increase the directivity and percentage reflected power. To increase the signal strength an amplifier is introduced and it is constructed using LM 741. Further to notify us when the tank has reached its capacity, a comparator circuit is constructed. All the constructed amplifier and comparator circuits are evaluated in B2 Spice. Depending on the amplitude of the signal received when the tank has reached its capacity, a reference voltage is fed to comparator circuit. The output of comparator circuit is fed to LED. Thus when the LED is lit up, it is observed that the tank has reached its capacity.


Advisors: Mansour Tahernezhadi.||Committee members: Michael J. Haji-Sheikh; Martin Kocanda.


50 pages




Northern Illinois University

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