As early as 1738, the Swiss Daniel first Bernoulli measured water flow by differential pressure method based on Bernoulli equation. Later, the Italians g.b. Venturi research uses venturi tube to measure flow, and published results in 1791. 1886, the American C. Herschel a practical device for measuring water flow by venturi in the early 20th century to the medium term, the original measurement principle gradually matured, people began to explore new measuring principles since 1910, the United States began to develop measurement of water flow in the open ditch trough-type flowmeter. In the 1922, R.L Pachel the original Venturi flume into a Pachel sink (named in 1929 by the American Society of Civil Engineers). 1911-1912 years, Hungarian-American T.von Carmen proposed a new theory of Carmen Vortex Street. In the 30 's, a method for measuring the flow rate of liquids and gases was explored using sound waves, but no significant progress was made until the Second World War until 1955, when the acoustic-cycling (two-group) Maxentius flowmeter was used to measure the flow of aviation fuel. In 1945, a. Colin successfully measured the flow of blood with an alternating magnetic field. After the 60 's, the instrument to the precision, miniaturization and other direction of development. For example, a force-balanced differential pressure transmitter and a capacitive differential pressure transmitter are present in order to improve the precision of the differential pressure instrument, and the electromagnetic flowmeter with non-uniform magnetic field and low frequency excitation mode is used to make the sensor miniaturization of the electromagnetic flowmeter and improve the signal-to-noise ratio. With the rapid development of integrated circuit technology, ultrasonic (wave) flowmeter with phase-locked loop technology has been widely used. The wide application of microcomputers has further improved the capacity of flow measurement, such as laser Doppler flow meter application of microcomputers can handle more complex signals.
The United States issued the first TUF patent as early as 1886, and the 1914 patent says TUF traffic is related to frequency. The first TUF in the United States, developed in 1938, was used to measure fuel flow on aircraft, only to achieve real industrial applications in the aftermath of the Second World War because of the need for a high-precision, fast-responding flowmeter for jet engines and liquid jet fuel. Nowadays, it has been widely used in petroleum, chemical industry, scientific research, national defense and measurement departments.
Flow measurement was first started by the Swiss, in 1738, the famous Swiss physicist Daniel Bernoulli based on Bernoulli equation, using differential pressure method to measure water flow.