Vortex shedding flowmeter based on CPLD and correcting method thereof
A vortex flowmeter, vortex street technology, applied in the direction of volume/mass flow generated by electromagnetic effect, volume/mass flow generated by mechanical effect, liquid/fluid solid measurement, etc., can solve the program deviation from the normal path, measurement range Narrow, unstable use and other problems, to achieve the effect of increased running speed, good real-time performance, and fast running speed
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0041] see figure 1 , the vortex flowmeter of the present invention adopts a design that integrates two output modes of two-wire current and three-wire pulse, mainly from the perspective of dual-channel output and low power consumption, and designs an overall vortex flowmeter based on CPLD circuit.
[0042] As shown in the figure, the overall structure of piezoelectric sensors and instruments can be divided into piezoelectric sensors, vortex street pre-signal processing circuits, standard pulse shaping circuits, precision voltage-current conversion circuits, power supply voltage conversion circuits, crystal oscillator circuits and the core CPLD main control chip circuit, each part will be explained separately below.
[0043] 1. Piezoelectric sensor
[0044] Piezoelectric ceramics are packaged in the piezoelectric sensor. When the fluid passes throug...
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