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首页> 美国卫生研究院文献>British Heart Journal >Distortion of non-invasive cardiac pulse curves. A capillary-damped pick-up and a calibration unit forapex cardiograms and other pulse curves.
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Distortion of non-invasive cardiac pulse curves. A capillary-damped pick-up and a calibration unit forapex cardiograms and other pulse curves.

机译：非侵入性心脏搏动曲线失真。毛细管阻尼传感器和校准单元可记录心电图和其他脉搏曲线。

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摘要

A calibration unit and a capillary-damped pick-up, of funnel type, intended for apex cardiograms and other non-invasive cardiac pulse curves are presented. The physical properties of a recording system, suitable for non-invasive cardiac diagnostic techniques, are reviewed. In 4 identical recording units consisting of a funnel with and without capillary damping, connected via air transmission to a transducer, the overamplification in the underdamped systems varied between 2-4 and 4-3, and in the capillary-damped systems between 1-1 and 1-2. The capillary damping gave an approximately linear relation between phase shift and frequency in the high frequency range with a calculated delay of about 4ms. The low frequency time constant in the systems varied between 1-9 and 4-6 s, depending on the amplifier setting used, which for sine curves of frequency 0-5 and 2 Hz means an apparent prematurity for their maxima and minima varying between 53 and 1 ms, this being larger with lower frequency time constants and lower frequency curves.
机译：提出了用于心尖和其他非侵入性心搏曲线的漏斗型校准单元和毛细管阻尼传感器。回顾了适用于非侵入性心脏诊断技术的记录系统的物理特性。在4个相同的记录单元（包括带有和不带有毛细管阻尼的漏斗）中，通过空气传输连接到换能器，欠阻尼系统中的过度放大在2-4和4-3之间变化，而毛细管阻尼系统中的过度放大在1-1之间变化和1-2。毛细管阻尼在高频范围内给出了相移与频率之间的近似线性关系，计算得出的延迟约为4ms。系统中的低频时间常数在1-9到4-6 s之间变化，具体取决于所使用的放大器设置，对于频率0-5和2 Hz的正弦曲线，这意味着它们的最大值和最小值在53之间变化时明显过早。和1 ms，在使用较低的频率时间常数和较低的频率曲线时会更大。

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