流速仪的流量测定根据矩形封闭管道流量测量的流速面积法,先测出流速再乘以断面面积即得流量,是一种测量河流、湖泊和渠道等水体的水流流量的仪器。流速仪的种类主要有机械、电测和超声3种类型,机械型以转子式为主,有旋桨式和旋杯式流速仪;电测型有电磁式流速仪;超声型有超声波时差法和多普勒法流速仪。 Flow meter flow measurement According to the rectangular closed pipe flow measurement flow area method, first measure the flow rate and then multiplied by the cross-sectional area of ​​the flow rate, is a measure of rivers, lakes and channels of water flow and other instruments. There are three types of the current meter: mechanical, electrical and ultrasonic. The main mechanical type is the rotor type, the propeller type and the rotary cup type flow meter, the electric type and the electromagnetic type flow meter, the ultrasonic type has the ultrasonic time difference method And Doppler flowmeter.