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当导体在磁场中作切割磁力线方向的运动时,就会产生一个其方向与磁场方向和导体运动方向相垂直的感应电动势。这个感应电动势e的大小与磁感应强度B和导体运动速度V成正比;即e=BLV。式中L为导体的长度。于是当磁感应强度B恒定,同时导体的长度L为一定时,感应电动势e只与导体的运动速度V成正比例。于是人们利用这个法拉弟的电磁感应定律设计了测量封蔽管道中导电液体的体积流量的仪表一电磁流量计。国际上从二十年代初就有人对电磁流量计进行探索性的实验。我国是从1957年开始对电
When the conductor in the magnetic field for cutting the direction of the magnetic line of movement, it will produce a direction and the direction of the magnetic field and the direction of motion of the conductor perpendicular to the induced electromotive force. The magnitude of this induced electromotive force e is proportional to the magnetic induction B and the conductor velocity V; ie, e = BLV. Where L is the length of the conductor. So when the magnetic induction B constant, while the length of the conductor L is constant, the induced electromotive force e only with the conductor velocity V is proportional to. Therefore, people use this Faraday’s electromagnetic induction law to design a measure of the volume of conductive liquid in the enclosed pipe flow meter-electromagnetic flowmeter. Internationally, since the early 1920s, some people have conducted exploratory experiments on electromagnetic flowmeters. Our country started to power from 1957