Design and development of microwave based moisture measurement system

Moisture measurement of grains and pulses using microwave transmission technique based on attenuation and phase shift is presented in this paper. In the proposed system, horn lens antennas are used which offer a directivity improvement of 2 dB as compared to conventional horn enabling higher accuracy in measurement. Calibration of the system is performed using three calibration techniques of which the Density Independent Function method offers the least SEC of 0.1217%. A Graphical User Interface has been developed which allows the user to calibrate the system for the grains and pulses of his choice in calibration mode In the operation mode, user can determine the moisture content, permittivity, bulk density of the sample under test.