Development of microwave imaging system using multi-static configuration with polarization diversity for object detection/

Chandran, Aishwarya (2022) Development of microwave imaging system using multi-static configuration with polarization diversity for object detection/. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Imaging systems, for example, play an essential role in our daily lives. It has been widely employed in a variety of applications, including civil, industrial, and biological, to identify or detect an object that has been obscured by a structure. X-rays, CT scans, MRI (magnetic resonance imaging), ultrasound, and microwave imaging are just a few examples of imaging. In order to detect the substance, the sensors of the 4x4 MWI system based on a multi-static arrangement have been designed. The microwave sensors with different polarization angles of 0 degrees, 45 degrees, -45 degrees, and 90 degrees have been designed using a rectangular patch structure at a frequency of 2.4GHz. All sensors are able to meet the minimum criterion of -10dB for the reflection coefficient. The next step was to configure the 4x4 multi-static MWI system so that it could be tested for object detection. This setup consists of four transmitter (Tx1 – Tx4) and four receivers (Rx 1 – Rx 4) and all the signal transmitted simultaneously to each four receivers. During this time, several materials, including an empty bottle, water, soap, stones, oil, and flour, were chosen to be examined (MUT). The receivers are connected to AD8318 module to convert AC to DC signal which the operating frequency is 1 to 8GHz with input power between 5dBm to -65dBm, supply voltage of 7V to 15V and producing the output voltage in range of 0V to 2V. This project is using Arduino MEGA 2560 as the processing unit and for the display module, this system is using the 3.5” TFT screen display. The development system is able to characterize the different material based on the detected voltage.

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