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1. 发明授权

US07137955B2 Methods and systems for distal recording of phonocardiographic signals 失效
公开(公告)号：US07137955B2
公开(公告)日：2006-11-21
申请号：US10418207
申请日：2003-04-18
申请人： Keith A. Bartels , Kevin S. Honeyager , Larry D. Canady, Jr.
发明人： Keith A. Bartels , Kevin S. Honeyager , Larry D. Canady, Jr.
IPC分类号： A61B5/04
CPC分类号： A61B5/02125 , A61B5/02 , A61B5/024 , A61B5/0285 , A61B5/0816 , A61B5/6817 , A61B5/7221 , A61B7/023 , A61B7/04
摘要： Methods and systems for determining cardiovascular parameters of a patient. In an exemplary embodiment, the method includes placing a phonocardiogram sensor on a patient's body at a first distal location to the heart, and a blood-pressure waveform sensor at a second distal location to the heart. Then, a first set and a second set of waveforms is obtained from the phonocardiogram sensor and the blood-pressure waveform sensor, respectively. A signal processing or conditioning operation may optionally be performed using the first and second sets of waveforms. Then, a time delay between a dicrotic notch signal and an S2 signal is determined. A blood pressure pulse transit time value is calculated by adding S2D, representing a time delay between a patient's heart valve closure time and an arrival time of the S2 signal at the first distal location, to the time delay between a dicrotic notch signal and an S2 signal. Cardiovascular parameters are then determined using the determined blood pressure pulse transit time and at least one physical parameter representative of a arterial distance between a location of the aortic valve and a location of the blood-pressure waveform sensor.

2. 发明授权

US06873746B2 Apparatus and method for monitoring a cable 有权
标题翻译：用于监测电缆的装置和方法
公开(公告)号：US06873746B2
公开(公告)日：2005-03-29
申请号：US09923256
申请日：2001-08-02
申请人： Andrew H. Stewart , K. Arun Pandey , Glenn M. Light , Richard F. Tennis , Bernard A. Clairmont , Edward A. Bloom , Keith A. Bartels
发明人： Andrew H. Stewart , K. Arun Pandey , Glenn M. Light , Richard F. Tennis , Bernard A. Clairmont , Edward A. Bloom , Keith A. Bartels
IPC分类号： G01R31/02 , G06T7/00 , G06K9/36 , G01L1/26
CPC分类号： G06T7/0004 , G01R31/021 , G06T7/70
摘要： In one embodiment the present invention provides a device for monitoring a cable, comprising an imaging device having a field of view; a target, distinguishable within the field of view of the imaging device, associated with a cable; and a computer processor connected to the imaging device for analyzing images of the target produced by the imaging device to determine a position of the cable. In another embodiment, the present invention provides a method for monitoring a cable, comprising calibrating a first image of a predetermined field of view showing a portion of a cable to be monitored; capturing a second image of the predetermined field of view; correlating the first image with the second image to determine a position of the portion of the cable within the second image; and reporting said position.
摘要翻译：在一个实施例中，本发明提供了一种用于监测电缆的装置，包括具有视野的成像装置; 在与成像装置的视野范围内可区分的目标，与电缆相关联; 以及连接到成像装置的计算机处理器，用于分析由成像装置产生的目标的图像，以确定电缆的位置。在另一个实施例中，本发明提供了一种用于监视电缆的方法，包括校准表示要监视的电缆的一部分的预定视场的第一图像; 捕获预定视野的第二图像; 将所述第一图像与所述第二图像相关联以确定所述电缆在所述第二图像内的所述部分的位置; 并报告该职位。

3. 发明授权

US06295677B1 Method for inspecting liquid filled pipes using magnetostrictive sensors 有权
标题翻译：使用磁致伸缩传感器检查填充液体的管道的方法
公开(公告)号：US06295677B1
公开(公告)日：2001-10-02
申请号：US09469423
申请日：1999-12-23
申请人： Hegeon Kwun , Keith A. Bartels
发明人： Hegeon Kwun , Keith A. Bartels
IPC分类号： G01N2908
CPC分类号： G01N29/46 , G01N29/2412 , G01N29/341 , G01N29/348 , G01N2291/0421 , G01N2291/0422 , G01N2291/048
摘要： An improved method for defect detectability for the inspection of liquid filled pipes using magnetostrictive sensors. The improved method comprises first recognizing the liquid-induced changes in the dispersion properties of the second longitudinal wave mode, L(0,2). These liquid-induced changes include a severe dispersion at periodic branching frequencies that result in a pulse-like characteristic in the extended received signal. A trailing portion of a received signal component associated with a geometric irregularity, is shown to comprise the branching frequency components. The trailing portion of the extended signal may therefore be removed in order to improve defect detection. The removal process comprises one of three alternative methods. A first method includes creating a short duration pulse free of the frequency components that comprise the trailing signals, and applying the pulse to a magnetostrictive transmitter, thereby generating a longitudinal wave signal in the pipe wall free of the trailing signal frequency components. A second method comprises transmitting a broadband signal and processing the detected signal through a digital filter that eliminates those frequency components known to comprise the trailing signals. A third method involves using a signal whose bandwidth lies in the region between two adjacent branching frequencies in the dispersion curve. The result is a detected signal within which components representative of irregularities are less extended and therefore less likely to override subsequent defect components in the detected signal.
摘要翻译：一种用于使用磁致伸缩传感器检测填充液体的管道的缺陷可检测性的改进方法。改进的方法包括首先识别第二纵波模式L（0,2）的液体引起的色散特性变化。这些液体引起的变化包括在延伸的接收信号中导致脉冲状特征的周期性分支频率的严重色散。与几何不规则相关联的接收信号分量的尾部被示出为包括分支频率分量。因此可以去除扩展信号的尾部，以便改善缺陷检测。去除过程包括三种替代方法之一。第一种方法包括产生不含包括尾部信号的频率分量的短持续时间脉冲，以及将脉冲施加到磁致伸缩发射机，由此在没有拖尾信号频率分量的管壁中产生纵波信号。第二种方法包括传输宽带信号并通过数字滤波器处理检测到的信号，该数字滤波器消除已知包括尾部信号的那些频率分量。第三种方法涉及使用其带宽位于色散曲线中的两个相邻分支频率之间的区域中的信号。结果是检测信号，其中表示不规则性的部件较少延伸，因此不太可能覆盖检测到的信号中的后续缺陷分量。

4. 发明授权

US06205859B1 Method for improving defect detectability with magnetostrictive sensors for piping inspection 有权
标题翻译：用于管道检查用磁致伸缩传感器改善缺陷可检测性的方法
公开(公告)号：US06205859B1
公开(公告)日：2001-03-27
申请号：US09228456
申请日：1999-01-11
申请人： Hegeon Kwun , Keith A. Bartels
发明人： Hegeon Kwun , Keith A. Bartels
IPC分类号： G01N2912
CPC分类号： G01N29/36 , G01N29/2412 , G01N29/348 , G01N29/40 , G01N29/46 , G01N2291/0258 , G01N2291/0421 , G01N2291/0422 , G01N2291/2634
摘要： An improved method for defect detection with systems using magnetostrictive sensor techniques. The improved method involves exciting the magnetostrictive sensor transmitter by using a relatively broadband signal instead of a narrow band signal typically employed in existing procedures in order to avoid signal dispersion effects. The signal detected by the magnetostrictive sensor receiver is amplified with an equally broadband signal amplifier. The amplified signal is transformed using a time-frequency transformation technique such as a short-time Fourier transform. Finally, the signal characteristics associated with defects and anomalies of interest are distinguished from extraneous signal components associated with known wave propagation characteristics. The process of distinguishing defects is accomplished by identifying patterns in the transformed data that are specifically oriented with respect to the frequency axis for the plotted signal data. These identified patterns correspond to signals from either defects or from known geometric features in the pipe such as welds or junctions. The method takes advantage of a priori knowledge of detected signal characteristics associated with other wave modes (such as flexural waves) and sensor excitation as well the effects caused by liquid induced dispersion.
摘要翻译：一种使用磁致伸缩传感器技术的系统进行缺陷检测的改进方法。改进的方法包括通过使用相对宽带信号来代替通常在现有程序中使用的窄带信号来激励磁致伸缩传感器发射机，以避免信号色散效应。由磁致伸缩传感器接收器检测的信号用同等宽度的信号放大器放大。放大的信号使用诸如短时傅里叶变换的时间 - 频率变换技术进行变换。最后，与感兴趣的缺陷和异常相关联的信号特征与与已知的波传播特性相关联的外来信号分量区分开。区分缺陷的过程是通过识别对于绘制的信号数据而相对于频率轴具体定向的变换数据中的模式来实现的。这些识别的图案对应于来自任何缺陷的信号或来自管道中的已知几何特征的信号，例如焊缝或接头。该方法利用了与其他波形（例如弯曲波）和传感器激励相关联的检测信号特性以及由液体诱导色散引起的影响的先验知识。

5. 发明授权

US6000288A Determining average wall thickness and wall-thickness variation of a liquid-carrying pipe 失效
标题翻译：确定载液管的平均壁厚和壁厚变化
公开(公告)号：US6000288A
公开(公告)日：1999-12-14
申请号：US63362
申请日：1998-04-21
申请人： Hegeon Kwun , Keith A. Bartels
发明人： Hegeon Kwun , Keith A. Bartels
IPC分类号： G01B17/00 , G01B17/02 , G01N29/04 , G01N29/11 , G01N29/46
CPC分类号： G01N29/449 , G01B17/00 , G01B17/02 , G01N29/041 , G01N29/11 , G01N29/46 , G01N2291/02854 , G01N2291/0421 , G01N2291/102 , G01N2291/2634
摘要： The average wall thickness and the wall-thickness variation of a liquid-carrying pipe are determined. An elastic wave is generated and is measured after traveling a distance along the pipe. From the received wave, the average radius of the pipe, the average inside diameter of the pipe, and the inside diameter variation of the pipe are determined. From the average radius of the pipe and the average inside diameter of the pipe, the average wall thickness of the pipe is determined. From the variations in the average radius of the pipe and the inside diameter variation of the pipe, the wall-thickness variation of the pipe is determined. To determine the average inside diameter of the pipe, the invention relies upon the coupling between the elastic wave modes propagating in the wall of the pipe and the modes propagating in the liquid within the pipe.
摘要翻译：确定液体输送管的平均壁厚和壁厚变化。产生弹性波，并沿着管道行进一段距离后测量。从接收的波形中，确定管的平均半径，管的平均内径和管的内径变化。从管的平均半径和管的平均内径确定管的平均壁厚。根据管的平均半径的变化和管的内径变化，确定管的壁厚变化。为了确定管的平均内径，本发明依赖于在管的壁中传播的弹性波模与在管内的液体中传播的模式之间的耦合。

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