Ultrasonic flow meter measurement principle and components
Ultrasonic flowmeter is a non-contact flow measuring instrument, which has developed rapidly in the past 20 years and has become an indispensable flowmeter in flow measuring instruments.
Ultrasonic flowmeter is a non-contact flow measuring instrument, which has developed rapidly in the past 20 years and has become an indispensable flowmeter in flow measuring instruments. Especially in the flow measurement of large pipe diameter, the flow measurement of two-phase flow containing solid particles is the flow measurement of corrosive media and flammable and explosive media, the flow measurement of open channels of rivers and canals, and the flow measurement of non-filled water pipes. Compared with other measured flowmeters, it has very obvious advantages.
Ultrasonic flowmeter is the use of ultrasonic propagation characteristics in the fluid to achieve flow measurement, ultrasonic propagation in the fluid, can be loaded with fluid flow rate information. Therefore, by receiving the ultrasonic wave, the velocity of the measured flow can be detected, and then converted into the flow rate, so that the goal of measuring the flow can be achieved. In the use of ultrasonic flow measurement methods there are many, according to the way of signal detection, can be roughly divided into the propagation speed method, Doppler, correlation method, beam offset method, etc., in industrial production measurement in the application of the propagation speed method is more common.
The ultrasonic flowmeter is composed of ultrasonic transducer, electronic circuit and flow display and accumulation system. The ultrasonic emission transducer converts electrical energy into ultrasonic energy and transmits it to the fluid being measured, and the ultrasonic signal received by the receiver. After the electronic line amplification effect is converted into an electrical signal representing the flow, it is supplied to the display and integration instrument for display and integration, so that the detection and display of the flow is realized.
The piezoelectric transducer commonly used in ultrasonic flowmeter is to use the piezoelectric effect of piezoelectric materials, and adopt a suitable emission circuit to add electric energy to the piezoelectric element of the emission transducer, so that it produces ultrasonic vibration. The ultrasonic wave is propagated by being shot into the fluid at a certain time and then received by the receiving transducer. It is the electrical energy changed by the piezoelectric element, which is more convenient to detect, and the transmitting transducer is the use of the inverse piezoelectric effect of the piezoelectric element, so it will receive the transducer, which is the use of the piezoelectric effect.
