Validation of vortex flowmeters

被引：10

作者：

Clarke, DW ^{[1
]}

Ghaoud, T ^{[1
]}

机构：

[1] Univ Oxford, Dept Engn Sci, Oxford OX1 3PJ, England

来源：

COMPUTING & CONTROL ENGINEERING JOURNAL | 2002年 / 13卷 / 05期

关键词：

Algorithms - Bandpass filters - Hysteresis - Natural frequencies - Oscillators (electronic) - Phase locked loops - Transfer functions - Vortex shedding;

D O I：

10.1049/cce:20020503

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A vortex-shedding flow meter produces an approximately sinewave signal whose average frequency is proportional to volumetric flow rate. The frequency of vortex shedding varies over a large range (up to 1:100), depending on the size of the flow meter. The conventional frequency-estimation method-a zero-crossing algorithm-fails at low flows, where the signal:noise ratio is poor. This paper describes a dual phase-locked loop structure that tracks the frequency over the flowmeter's full range with improved accuracy. The lock indicators associated with each PLL provide the SEVA metrics.

引用

页码：237 / 241

页数：5