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1. 发明授权

US06915242B2 Evaluating a vortex flow-meter signal 有权
标题翻译：评估涡流流量计信号
公开(公告)号：US06915242B2
公开(公告)日：2005-07-05
申请号：US10889007
申请日：2004-07-13
申请人： Tarek Ghaoud , David W. Clarke
发明人： Tarek Ghaoud , David W. Clarke
IPC分类号： G01F1/32 , G06F19/00
CPC分类号： G01F1/329
摘要： A signal processor, for use with a zero crossing module of a vortex flow meter, includes a peak amplitude detector, a comparator, and a filter module. The filter module is enabled when the comparator determines that the amplitude is less than a low flow rate threshold. The filter module filters a vortex signal and the filtered signal is provided to a frequency estimator that uses a zero crossing algorithm. The signal processor may increase the signal-to-noise ratio at low flow rates for which the frequency estimator may not otherwise be able to accurately estimate the flow rate. Low flow rates may be measured by determining that there is a low flow rate using amplitude detection of a vortex signal, filtering the vortex signal based on the amplitude detection, and using a zero crossing algorithm on the filtered vortex signal.
摘要翻译：与涡流流量计的零交叉模块一起使用的信号处理器包括峰值振幅检测器，比较器和滤波器模块。当比较器确定振幅小于低流量阈值时，滤波器模块被使能。滤波器模块对涡流信号进行滤波，滤波后的信号被提供给使用零交叉算法的频率估计器。信号处理器可以在低流量下增加信噪比，频率估计器可能不能够准确地估计流量。可以通过使用涡流信号的振幅检测，基于振幅检测来过滤涡流信号，以及使用过滤涡流信号上的零交叉算法来确定存在低流量来测量低流量。

2. 发明授权

US06993445B2 Vortex flowmeter 有权
公开(公告)号：US06993445B2
公开(公告)日：2006-01-31
申请号：US09921293
申请日：2001-08-03
申请人： David W. Clarke , Tarek Ghaoud
发明人： David W. Clarke , Tarek Ghaoud
IPC分类号： G01F1/32
CPC分类号： G01F1/329
摘要： A process variable transmitter, implemented in a dual PLL structure, includes a first PLL having a first bandwidth producing a first output signal, and a second PLL having a second bandwidth narrower than the first bandwidth of the first PLL. The first and second PLLs are operable to lock into a frequency of an input signal and produce first and second output signals, respectively. The second PLL is operable to lock into the frequency of the input signal with greater accuracy and greater immunity to noise than the first PLL. A switch is operable to switch an output signal of the process variable transmitter between the first output signal and the second output signal.

3. 发明授权

US06832179B2 Evaluating a vortex flow-meter signal 有权
标题翻译：评估涡流流量计信号
公开(公告)号：US06832179B2
公开(公告)日：2004-12-14
申请号：US10177757
申请日：2002-06-24
申请人： Tarek Ghaoud , David W. Clarke
发明人： Tarek Ghaoud , David W. Clarke
IPC分类号： G06F1130
CPC分类号： G01F1/329
摘要： A signal processor, for use with a zero crossing module of a vortex flow meter, includes a peak amplitude detector, a comparator, and a filter module. The filter module is enabled when the comparator determines that the amplitude is less than a low flow rate threshold. The filter module filters a vortex signal and the filtered signal is provided to a frequency estimator that uses a zero crossing algorithm. The signal processor may increase the signal-to-noise ratio at low flow rates for which the frequency estimator may not otherwise be able to accurately estimate the flow rate. Low flow rates may be measured by determining that there is a low flow rate using amplitude detection of a vortex signal, filtering the vortex signal based on the amplitude detection, and using a zero crossing algorithm on the filtered vortex signal.
摘要翻译：与涡流流量计的零交叉模块一起使用的信号处理器包括峰值振幅检测器，比较器和滤波器模块。当比较器确定振幅小于低流量阈值时，滤波器模块被使能。滤波器模块对涡流信号进行滤波，滤波后的信号被提供给使用零交叉算法的频率估计器。信号处理器可以在低流量下增加信噪比，频率估计器可能不能够准确地估计流量。可以通过使用涡流信号的振幅检测，基于振幅检测来过滤涡流信号，以及对过滤的涡流信号使用零交叉算法，来确定存在低流量的低流量。

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