An adaptive calibration circuit for flow measurement using venturi

Design of an adaptive calibration circuit for flow measurement technique using venturi flow meter is reported in this paper. The objectives of the present work are: (i) to extend the linearity range of measurement to 100% of full scale input range, (ii) to make the measurement technique adaptive to variations in discharge coefficient, diameter ratio of venturi nozzle and pipe (β), liquid density, and liquid temperature, and (iii) to achieve the objectives (i) and (ii) using an optimized neural network. A suitable optimized ANN is added, in place of conventional calibration circuit, in cascade to data conversion unit. To produce outputs linear to input flow for the entire input range, and adaptive to variations in discharge coefficient, diameter ratio, liquid density, and temperature. Results show that the proposed technique has fulfilled the objectives.