Permanent magnetism type excitation method in use for electromagnetic flowmeter

A technology of electromagnetic flowmeter and excitation method, which is applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effect, etc. problem, to achieve the effect of simple structure, avoiding interference and improving response speed

Inactive Publication Date: 2005-03-30
ZHEJIANG UNIV
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Problems solved by technology

[0007] The low-frequency rectangular wave excitation technology has changed the morphological characteristics of power frequency interference. Using power frequency synchronous sampling technology, the electromagnetic flowmeter has a better ability to resist power frequency interference, and the measurement accuracy and zero point stability are higher. However, the frequency of low-frequency rectangular wave excitation Generally, it is 1/2 to 1/32 of the power frequency, which sacrifices the response speed of the electromagnetic flowmeter while obtainin

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  • Permanent magnetism type excitation method in use for electromagnetic flowmeter
  • Permanent magnetism type excitation method in use for electromagnetic flowmeter
  • Permanent magnetism type excitation method in use for electromagnetic flowmeter

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[0030] The present invention will be further described below in conjunction with the drawings and embodiments.

[0031] in figure 1 In the implementation form of the solution 1 shown, there are two permanent magnets 1 distributed on both sides of the pipe 2 opposite to each other, and the polarities of the two permanent magnets are arranged in the same direction. The pipe 2 is provided with an insulating layer or a measuring tube formed of insulating material. The conductive fluid flows through the measuring tube 2. An electrode 3 is installed on the inner wall of the measuring tube 2 perpendicular to the diameter direction of the magnetic field, and the electrode 3 is insulated from the measuring tube 2.

[0032] The input control signal S terminal of the switch 4 is connected to an output terminal of the microprocessor part 7, and the input voltage signal terminals X1 and Y1 of the switch 4 are connected to two output terminals of the microprocessor part 7. The switch 4 The sig...

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Abstract

The invention discloses a permanent magnet excitation method for electromagnetic flow meter. Said method includes the following steps: the permanent magnet can produce working magnetic field which is respectively perpendicular to conductive fluid flow-rate direction and electrode connected-wire direction, flow signal can be detected by electrode and fed into preamplifier portion, the preamplifier portion can be used for making impedance matching and differential amplification, then the obtained signal is fed into signal processing finally the processed signal can be fed into microprocessor portion, said microprocessor can be used for making calculation of flow, said flow value can be fed into display portion to display said flow value. It is simple in structure, can effectively detect flow signal and can effectively raise response speed of electromagnetic flow meter.

Description

technical field [0001] The invention relates to an excitation method for an electromagnetic flowmeter, in particular to a permanent magnet excitation method for an electromagnetic flowmeter. Background technique [0002] The electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. Its working principle is that when the conductive fluid moves and cuts the magnetic field lines in the working magnetic field, an induced electric potential e is generated at both ends of the fluid. Its direction is determined by the right-hand rule, and its magnitude is related to the magnetic induction of the magnetic field. The strength B is proportional to the length L of the fluid in the magnetic field and the moving speed u of the conductor. If B, L and u are perpendicular to each other, then e=Blu. [0003] The normal operation of the electromagnetic flowmeter requires a certain strength of the magnetic field. At present, there are three main methods of generating m...

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Application Information

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IPC IPC(8): G01F1/58
Inventor 傅新周泉金艳
Owner ZHEJIANG UNIV
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