Low cost intelligent vortex shedding flowmeter signal processing system based on DSP

A vortex flowmeter and signal processing technology, applied in the volume/mass flow generated by mechanical effects, volume indication and recording equipment, through the detection of dynamic effects of fluid flow, etc., can solve the problem of system implementation without giving algorithm calculation results , Experimental test results, system performance indicators and other issues, to achieve the effect of improving the ability to suppress noise, reducing peripheral devices, and reducing the size of the system

Inactive Publication Date: 2008-04-30
HEFEI UNIV OF TECH
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Problems solved by technology

However, the calculation results of the algorithm, the specific implementation scheme of the system, the experimental test results and the performance indicators of the system are not given in the paper.

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  • Low cost intelligent vortex shedding flowmeter signal processing system based on DSP
  • Low cost intelligent vortex shedding flowmeter signal processing system based on DSP
  • Low cost intelligent vortex shedding flowmeter signal processing system based on DSP

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Embodiment Construction

[0039] see figure 1 , the present embodiment is made up of analog signal conditioning module, TMS320LF2407A (DSP chip of TI company) and external expansion RAM, E2PROM, low voltage monitoring circuit, LCD display, keyboard input, analog quantity output circuit, pulse output circuit and power management module.

[0040] Vortex flowmeters are made using the Karman vortex principle in fluid dynamics. When the vortex generating body is placed in the fluid pipeline, two regular vortices will be generated on both sides of its downstream, and the frequency of vortex release is linearly related to the fluid flow rate, namely:

[0041] Q=k*f

[0042] In the formula, Q is the fluid volume flow rate, k is the instrument coefficient, and f is the vortex release frequency, that is, the vortex street frequency.

[0043] The sensor (such as: piezoelectric sensor) installed in the vortex generating body picks up the signal representing the frequency of the vortex street and converts it into...

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Abstract

This invention relates to one whorl flowmeter signal process system based on DSP intelligent and low cost, which is characterized by the following: analogue signal adjusting module, DSP chip and expanding RAM, EEPROM, low voltage monitor circuit, LCD display, keyboard input, analogue output, impulse output and power management module. The system adopts circle spectrum analysis and digital filter combination method to process the output signals of the flowmeter sensor.

Description

Technical field: [0001] The invention relates to a flow measuring instrument, in particular to a low-cost vortex flowmeter signal processing system with a digital signal processor (DSP) as the core and a combination of periodic graph analysis and digital filtering. Background technique: [0002] The vortex flowmeter is widely used in the field of fluid flow measurement because it has no moving parts in the measurement part, has small wear and pressure loss, has a large ideal range ratio, and can measure many fluid media. However, the vortex flow sensor is easily affected by fluid pulsation, pipeline or other vibration sources. Traditional signal processing methods, namely amplification, shaping, filtering and counting, cannot effectively suppress noise, so the measurement accuracy is not high; The threshold level will affect the turndown ratio, resulting in the inability to measure small flows; for different ranges and different measured fluids, the traditional signal proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32G01F15/06
Inventor 徐科军王肖芬陈智渊
Owner HEFEI UNIV OF TECH
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