Weak signal extraction system for fluidic flowmeter based on related amplification technology and method

Abstract

The invention discloses a weak signal extraction system for a fluidic flowmeter based on a related amplification technology and a method. The system adopts the related amplification technology as a signal processing mode of the fluidic flowmeter. A flow choking part is installed in a measuring tube; a first electrode, a third electrode and a second electrode are respectively installed at the front side and the back side of the flow choking part; a U-shaped excitation structure is installed on the measuring tube and can carry out excitation control by being connected with an excitation drive circuit; the second electrode is connected with the ground end of a related amplification circuit through a wire; the first electrode and the third electrode are connected to a differential amplification input end of the related amplification circuit; the output end of the related amplification circuit is respectively connected with an AD conversion circuit and a singlechip circuit, and the AD conversion circuit is connected to the singlechip circuit; and the singlechip circuit also fulfills the functions of LCD display and the like. By adopting the method, the fluidic flowmeter has the advantages of lower limit, wide measurement range, high accuracy, and the like.

Description

technical field [0001] The invention relates to the field of signal detection of jet flowmeters, in particular to a system and method for extracting weak signals of jet flowmeters based on correlation amplification technology Background technique [0002] At present, with the global shortage of energy and water resources and the start of key projects such as the South-to-North Water Diversion Project, the whole society has higher and higher requirements for water metering. Mechanical water meters have been widely used at home and abroad due to their simple structure and low price. However, mechanical water meters have transmission resistance and mechanical moving parts, resulting in low accuracy and high failure rate. The jet flowmeter has almost no pressure loss, no mechanical moving parts, and high reliability. At the same time, the lower measurement limit of the jet flowmeter is low, but the signal is easily disturbed by the outside at low flow rates. [0003] Existing j...

AI Technical Summary

Problems solved by technology

Mechanical water meters have been widely used at home and abroad due to their simple structure and low price. However, mechanical water meters have transmission resistance and mechanical moving parts, resulting in low accuracy and high failure rate.

The jet flowmeter has almost no pressure loss, no mechanical moving parts, and high reliability. At the same time, the lower measurement limit of the jet flowmeter is low, but the signal is easily disturbed by the outside at low flow rates.

[0003] Existing jet flowmeters generally use differential amplification technology to extract signals. The advantage of using this method is that the weak signal amplification capability is strong; the disadvantage is that it is easy to amplify the power frequency signal when it is in the air, and it is easy to cause flow mismeasurement.

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