Ultrasonic flowmeter is a non-contact flow measurement instrument, which has developed rapidly in the past 20 years. Especially in the large diameter flow measurement, flow measurement in two-phase flow containing solid particles, rivers and canals are on corrosive and flammable and explosive medium flow measurement, open channel flow and non full pipe flow measurement and other aspects. Compared with other flowmeters, it has obvious advantages.
Ultrasonic flowmeter is the use of ultrasound in the flow of fluid to achieve the characteristics of the flow measurement, ultrasonic wave in the fluid in the city, you can load the fluid velocity information. Therefore, by receiving the ultrasonic wave, the flow velocity of the measured fluid can be detected, and then the flow rate can be converted into a flow rate. There are many methods used in ultrasonic flow measurement, can according to the signal detection, generally can be divided into velocity method, Doppler, correlation method, beam deflection method, measurement in industrial production application propagation velocity method is the most common.
The ultrasonic flowmeter is composed of several parts, such as ultrasonic transducer, electronic circuit and flow display and accumulation system. The ultrasonic transducer is a device that converts electrical energy into ultrasonic energy and sends it to the measured fluid. After the amplification effect of the electronic circuit to convert the electrical signal to represent the flow, to supply the display and the meter to display and integration, so that the flow detection and display.
The piezoelectric transducer used in ultrasonic flowmeter is made of piezoelectric material, which is suitable for the piezoelectric component of the transmitting transducer by using the appropriate transmitting circuit. Ultrasonic wave is injected into the fluid at a certain time, and then received by the receiving transducer. It is through the piezoelectric element into the electric energy, it is more convenient to detect, the transducer is the use of piezoelectric components of the inverse piezoelectric effect, which will receive the transducer, which is the use of piezoelectric effect.
