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Parallel type electromagnetic flowmeter with dual excitations

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

Inactive Publication Date: 2009-05-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 1: Referring to Fig. 1, this parallel double excitation electromagnetic flowmeter includes a sensor 1 having an excitation magnetic field B to form a fluid cutting magnetic force line to generate an induced potential, a differential amplifier 3 having an input internal resistance R3 and a signal amplification factor K1 and A signal processing unit 4, the sensor 1 has 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 fluid The electrical conductivity makes two electrodes C and D have fluid internal resistance R1, and the electrodes C and D of sensor 1 have induced potential E1=K0×B×V under the fluid velocity V, K0 is the coefficient of sensor (1); It is characterized in that An additional excitation 2 is connected in parallel at both ends of the electrodes C and D of the...

Embodiment 2

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

[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 × R ...

Embodiment 3

[0105] Embodiment 3: This embodiment is basically the same as Embodiment 1, the difference is: referring to Fig. 6 and Fig. 7, the above-mentioned 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 addition...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/58
Inventor 沈天飞李斌曹金亮
Owner SHANGHAI UNIV
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