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Rapid transfer function determination for tracking filter

A transfer function, flow meter technology, applied in the measurement of flow/mass flow, volume/mass flow generated by mechanical effects, liquid/fluid solid measurement, etc., can solve problems such as limiting speed

Inactive Publication Date: 2004-01-21
MICRO MOTION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This limits how quickly the mass flow rate can be calculated, or what other functions the microprocessor can perform between mass flow rate calculations

Method used

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  • Rapid transfer function determination for tracking filter
  • Rapid transfer function determination for tracking filter
  • Rapid transfer function determination for tracking filter

Examples

Experimental program
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Embodiment Construction

[0012] Fig. 1 illustrates an embodiment of the vortex flowmeter 10 of the present invention. Generally, the vortex flowmeter 10 includes a vortex sensor 11 for detecting the vortex 15 in the fluid 14 flowing through the pipe 16. The vortex sensor 11 is connected to the electronic circuit 12. The electronic circuit 12 generates a current of 4 to 20 milliamperes (mA) indicating the flow on the current loop 17, and at the same time generates an output square wave F out , The square wave has a frequency proportional to the fluid flow rate.

[0013] The vortex flowmeter 10 includes a vortex meter housing 22 in which a non-linear body 24 is installed. When the fluid 14 flows through the non-linear body 24, a jet vortex 15 having a frequency representing the flow velocity is generated. The vortex sensor 26 is preferably located at the non-linear body 24 and detects a pressure difference associated with the jet vortex 15. For example, the vortex sensor 26 may include a piezoelectric senso...

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PUM

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Abstract

A vortex flowmeter (10) senses a pressure of vortices in a flowing fluid and transmits an output related to mass flow. The vortex flowmeter includes a dynamic filter (68) filtering the vortex pressure signal. The dynamic filter (68) provides a first filtered output signal (82) and a second filtered output signal (86). The dynamic filter (68) includes a controllable transfer function. Control circuitry (70) controls the controllable transfer function and provides an output related to mass flow as a function of the first filtered output signal (82) and the second filtered output signal (86). Transmitter circuitry (85) receives the output signal and transmits a signal related to mass flow.

Description

Technical field [0001] The present invention is particularly suitable for a vortex baffle flowmeter or a flowmeter such as a vortex meter that can respond to fluid flow. The present invention relates to the determination of digital filter transfer functions in these instruments and other processing instruments. Background technique [0002] The flow meter detects the flow of liquid and gas in the pipeline and provides a signal indicative of this flow. Under certain conditions, the existence of any obstacles in the pipeline, such as wake rods, non-linear bodies, or vortex generators, will produce periodic vortices in the liquid flow. The frequency of these vortices is directly proportional to the flow rate in the flow meter. The wake vortex provides an alternating pressure difference at both ends of the nonlinear body at the wake frequency. The pressure difference is converted into an electrical signal by piezoelectric crystals or other pressure difference devices. The size of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32
CPCG01F1/329G01F1/3287
Inventor 洛厄尔·A·克莱文
Owner MICRO MOTION INC