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Parallel type electromagnetic flowmeter with dual excitations

An electromagnetic flowmeter, double excitation technology, applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effects, etc., can solve the problem of dynamic monitoring of fluid conductivity or internal resistance. There is no ideal method, etc. question

Inactive Publication Date: 2006-04-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no ideal method for quantitative dynamic monitoring of fluid conductivity or internal resistance.

Method used

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  • Parallel type electromagnetic flowmeter with dual excitations
  • Parallel type electromagnetic flowmeter with dual excitations
  • Parallel type electromagnetic flowmeter with dual excitations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment one: see figure 1 , the parallel dual-excitation electromagnetic flowmeter includes a sensor 1 with an excitation magnetic field B to form an induced potential generated by fluid cutting magnetic force lines, a differential amplifier 3 with an input internal resistance R3 and a signal amplification factor K1, and a signal processing unit 4, the sensor 1 There are two measuring electrodes C and D for the fluid, the two measuring electrodes C and D are connected to the input of the differential amplifier 3, and the output U of the differential amplifier 3 is connected to the signal processing unit 4; the conductivity of the fluid makes the two electrodes C and D have a fluid internal resistance R1, and the electrodes C and D of the sensor 1 have an induced potential E1=K0×B×V at a fluid flow rate V, and K0 is a coefficient of the sensor (1); it is characterized in that an additional excitation 2 is connected in parallel with the sensor (1) two ends of electrode...

Embodiment 2

[0089] Embodiment 2: This embodiment is basically the same as the above-mentioned embodiment, the difference is: see Figure 4 and Figure 5 , the above additional excitation 2 is composed of the equivalent internal resistance R2 and the controllable potential E2 connected in series, and the output U of the corresponding differential amplifier 3 is:

[0090] U = K 1 × E 1 × R 50 R 1 + R 50 + E 2 × R 40 R 2 + R 40 , in R 40 = R 1 × ...

Embodiment 3

[0105] Embodiment three: this embodiment is basically the same as embodiment one, the difference is: see Figure 6 and Figure 7 , the above additional excitation 2 is only composed of controllable internal resistance R2, corresponding to the output U of the differential amplifier 3:

[0106] U = K 1 × E 1 × R 50 R 1 + R 50 , in R 50 = R 2 × R 3 R 2 + R 3 ;

[0107] The signal processing unit 4 has a control output G3 to control the controllable internal resistance R2 of the additional...

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Abstract

Under principle of electromagnetic flowmeter of traditional magnetic field excited sensor, the invention adds a controllable electric potential excitation source onto output end of signal from measuring electrode of sensor in parallel. Through relation between parallel excitation and internal resistance of liquid, flow rate of liquid is measured and also internal resistance of liquid is measured as well. Thus, the electromagnetic flowmeter possesses functions for dynamic measuring internal resistance of liquid or conductivity quantificationally.

Description

technical field [0001] The invention relates to an electromagnetic flowmeter, in particular to a parallel double excitation electromagnetic flowmeter capable of measuring fluid flow velocity and fluid internal resistance. technical background [0002] The electromagnetic flowmeter is based on a measurement equation formed by the induction potential generated by the fluid cutting the magnetic force line under an excitation magnetic field. The two electrodes of the sensor output an induction potential proportional to the fluid flow velocity. Therefore, the electromagnetic flowmeter is mainly an instrument for measuring fluid flow. With the increasing application of electromagnetic flowmeters, it is hoped that electromagnetic flowmeters can have the ability to quantitatively monitor fluid conductivity or internal resistance technically. At present, there is a method of detecting the relative change threshold of fluid conductivity that uses capacitive coupling high-frequency me...

Claims

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Application Information

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IPC IPC(8): G01F1/58
Inventor 沈天飞李斌曹金亮
Owner SHANGHAI UNIV
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