A method for reconstructing the pulse counting signal of a multi-channel flowmeter verification device

Abstract

The invention provides a multi-path flow meter calibrating device pulse counting signal reconstruction method. The method comprises the steps of obtaining output signals uo(t) of to-be-calibrated flow meters and a standard flow meter; analyzing the amplitude-frequency characteristics of the uo(t); selecting the first trough frequency before the signal with the maximum amplitude as the filter cut-off frequency; using an N-order high pass digital Chebyshev filter and obtaining filtered signals v(t); calculating the average period Tv and the amplitude mean square root Av of the v(t); setting the rising edge and falling edge threshold value coefficients ku and kd, the rising edge and falling edge triggering threshold values being kuAv and kdAv; recording all the rising edge triggering positions as a one-dimensional array Pu and all the falling edge triggering positions as a one-dimensional array Pd; reconstructing pulse signals u(t) according to the Pu and Pd and with the Av as the amplitude, the time delta t between adjacent rising edges (falling edges) meeting the condition of (1-3sigma)Tv<delta t<(1+3sigma)Tv, wherein sigma is the pulse output period deviation.

Description

technical field [0001] The invention relates to the field of flowmeter pulse signal denoising, in particular to a pulse counting signal reconstruction method of a multi-channel flowmeter verification device. Background technique [0002] With the development of modern industry, the demand for flowmeters continues to increase, especially the pulse output flowmeter (in the case of a stable flow field, the instantaneous flow rate of the pulse output flowmeter is proportional to the pulse frequency) has been unprecedentedly applied, which is of great significance for its rapid and accurate verification. major. Universal verification device, the industrial computer drives the commutator according to the phase-locked signal of the pulse signal of the flowmeter, and can intercept the pulse signal of the flowmeter for the entire period. However, in multi-position devices, there are non-linear distortions in the signals generated by non-ideal devices such as standard flowmeters, unt...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above existing problems and defects, the present invention proposes a method for reconstructing the pulse counting signal of a multi-channel flowmeter verification device, which realizes the method of combining filtering and reconstruction, reconstructs the output pulse signal of the flowmeter, and removes the Single-frequency noise, pulse interference, white noise, improve the signal-to-noise ratio of the signal, and prevent pulse counting errors caused by noise interference in flow measurement

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