Research Of Ultrasonic Flow Measurement And Temperature Compensation Based On Neural Netwerk

In traditional ultrasonic flow measurement, temperature has greater infection on the speed of sound, furthermore, the accuracy of ultrasonic will be affected by the related environmental factors of fluid, which include internal diameters and external diameter of the pipeline and pipeline pressure etc. In order to ensure the high accuracy and high sensitivity measurements of ultrasonic flowmeter, this text researches the ultrasonic flow measurement and temperature compensation based on neural network.According to the flow field of measured fluid, through analyzing the impact of mobility on the measurement of factors, time difference works of ultrasonic flow measurement is determined to use.According to the characteristics of sound velocity variation caused by temperature variation, through the research of the characteristics, the structure, algorithms and other contents of neural network, determining to use neural network technology to carry out temperature compensation, and temperature compensation model of ultrasonic flow measurement is established.Ultrasonic flow measurement system hardware design with temperature compensation is completed. Related circuits are designed rationally by the premise of ensuring accuracy of hardware design. Major hardware circuits include ultrasonic transmitter circuit, receiver circuit, temperature measurement circuit, system control circuit, high frequency oscillation and counting circuit.The software programs are designed according to the corresponding hardware structure. Using MATLAB simulation software to train the network by using measurement samples, thus temperature compensation of the ultrasonic flow measurement system is established. By using neural network technology to temperature compensation, the purpose for reducing error and increasing measurement accuracy are attained. The precision of the ultrasonic flow measurement is improved greatly by the application of neural network technique, and the intelligent temperature compensation of the ultrasonic flow measurement is realized, which lays the foundation for the practical application of high precision ultrasonic flowmeter.