Stability Design of the Ultrasonic Signal in Flow Measurement

CAO Xiao-hua，SUN Jie
（College of Electrical Engineering，North China University of Science and Technology，Tangshan 063009，China）
Abstract：The traditional flow measurement，due to the material of ultrasonic transducer and the gas medium were a far cry from what the characteristic impedance of the two，causing the transducer transmitting and receiving efficiency was too low. Because this project requires the design of the ultrasonic flowmeter，then it can suitable for different pipe diameter measurement，and the gas flow velocity in the pipe was changed，ultrasonic transducer receives signal after amplification and detection，treatment should be to ensure that the signal amplitude unchanged. The system of automatic gain control signa was received，And after the nonlinear correction，it can provened high precision and good stability.
Key words：ultrasonic；flowmeter；automatic gain control