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    • 1. 发明授权
    • Noise rejecting detector for biomedical signals
    • 用于生物医学信号的噪声抑制检测器
    • US4899760A
    • 1990-02-13
    • US062781
    • 1987-06-15
    • Jonathan P. JaebMerle E. Converse
    • Jonathan P. JaebMerle E. Converse
    • A61B5/022A61B5/00A61B5/0428A61B5/145A61B5/1477
    • A61B5/14551A61B5/0428Y10S128/901Y10S128/902
    • An improved biological signal detector which is extremely sensitive, yet resistant to the effects of high frequency noise. A multiplexed signal representation of a plurality biological signals is demultiplexed by a detector circuit comprising a plurality of switches each of which controls an individual storage network. A switch logic control circuit synchronizes the various switches to close during the time intervals corresponding to the pulse amplitudes representing the particular signal of interest. The amplitude of the alternating component of each of the biological signals is stored in one of the respective storage networks over a number of pulse time intervals. In the preferred embodiment, the storage networks of the detector each have a time constant which is purposely chosen to be substantially longer than the time interval of the pulses. The long time constant of the storage networks allows the detector circuit to track changes in amplitude which manifest themselves over a relatively large number of time intervals, but prevents the detection of high frequency noise signals which may be present during the sampling intervals.
    • 一种改进的生物信号检测器,其极度敏感,但耐高频噪声的影响。 多个生物信号的复用信号表示由包括多个开关的检测器电路解复用,每个开关控制各个存储网络。 开关逻辑控制电路使各种开关在对应于表示感兴趣的特定信号的脉冲幅度的时间间隔期间同步闭合。 每个生物信号的交替分量的振幅通过多个脉冲时间间隔存储在相应的存储网络之一中。 在优选实施例中,检测器的存储网络各自具有时间常数,该时间常数被有意地选择为比脉冲的时间间隔更长。 存储网络的长时间常数允许检测器电路跟踪在相对较大数量的时间间隔上表现出来的幅度变化,但是防止在采样间隔期间可能存在的高频噪声信号的检测。
    • 3. 发明授权
    • Method and apparatus for locating leaks in a multiple layer geomembrane
liner
    • 用于定位多层土工膜衬里的泄漏的方法和装置
    • US4740757A
    • 1988-04-26
    • US934640
    • 1986-11-25
    • Merle E. ConverseThomas E. Owen
    • Merle E. ConverseThomas E. Owen
    • G01V3/10G01M3/16G01M3/40G01R27/18G01R31/00G01V3/02
    • G01R27/18G01M3/40G01V3/02
    • A leak detection and location method and apparatus for detection of perforations in a obscure geomembrane liner is set forth. In a typical application, upper and lower liners are positioned contiguous to one another and a conducting liquid is placed between them. In the event a tear or perforation is formed in the lower liner, a current flow path is established from a power supply and conductors connected to the power supply. The current flow path extends through the liquid to the leak. Because of the liquid path through the liner, electric current will flow through the perforation and establish an associated magnetic field in the near vicinity of the leak. Magnetic sensors are then swept across the surface of or through the impounded liquid above the liners to indicate such magnetic field variations and the locations of such perturbations correspond to the locations of the leak perforations.
    • 阐述了一种用于检测模糊土工膜衬套中的穿孔的泄漏检测和定位方法和装置。 在典型的应用中,上部和下部衬里彼此相邻地定位并且在它们之间放置导电液体。 在下层衬板中形成撕裂或穿孔的情况下,从连接到电源的电源和导体建立电流流路。 当前的流动路径延伸穿过液体泄漏。 由于通过衬套的液体路径,电流将流过穿孔,并在泄漏附近建立相关联的磁场。 然后将磁性传感器扫过穿过衬垫上方的被阻塞液体的表面,以指示这种磁场变化,并且这种扰动的位置对应于泄漏穿孔的位置。
    • 8. 发明授权
    • Directional potential analyzer method and apparatus for detecting and
locating leaks in geomembrane liners
    • 用于检测和定位土工膜衬里泄漏的定向电位分析仪方法和装置
    • US4725785A
    • 1988-02-16
    • US810023
    • 1985-12-17
    • Merle E. ConverseKathryn B. GlassThomas E. Owen
    • Merle E. ConverseKathryn B. GlassThomas E. Owen
    • G01M3/40G01R27/18G01R31/16G08B21/00
    • G01M3/40G01R27/18
    • A directional potential analyzer method and apparatus using a non-intrusive electrical measurement technique to obtain a precise location of a leak in a geomembrane liner. The method and apparatus can be used for detecting leaks in either a single layer or a two layer geomembrane liner. The directional potential analyzer comprises a differential voltage detection probe which is moved through the liquid with the potential difference between the electrodes on the probe being measured and recorded as a function of azimuthal position of the probe. An initial scan of the liquid impoundment is used as a reference trace showing all of the anomalies of an unfaulted liner. Subsequent traces obtained by rotating the analyzer probe at a later date are processed and compared with the reference trace to determine the occurrence of new anomalies representing leaks in the liner. In an alternate embodiment of the invention, two directional analyzers are employed and a triangulation analysis is used to obtain a more precise location of a leak in the liner.
    • 一种使用非侵入式电气测量技术的方向电位分析器方法和装置,以获得在土工膜衬里中的泄漏的精确位置。 该方法和装置可用于检测单层或双层土工膜衬里中的泄漏。 方向电位分析仪包括差分电压检测探针,其被测量并且记录在探针的方位位置的函数上,该探针被探测器中的电极之间的电位差移动通过液体。 使用液体蓄水池的初始扫描作为示出未破坏的衬管的所有异常的参考迹线。 随后通过旋转分析器探头获得的随后痕迹被处理并与参考迹线进行比较,以确定表示衬管中泄漏的新异常的发生。 在本发明的替代实施例中,采用两个方向分析器,并且使用三角测量分析来获得衬套中泄漏的更精确的位置。