Evaluation of magnetoelectric sensor systems for cardiological applications
Evaluation of magnetoelectric sensor systems for cardiological applications
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DOI：
10.1016/j.measurement.2017.09.047
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发表时间：
2018-02-01
期刊：
影响因子：
5.6
通讯作者：
Schmidt, Gerhard
中科院分区：
文献类型：
--
作者：
Reermann, Jens;Durdaut, Phillip;Schmidt, Gerhard
薄膜磁电传感器能够测量非常低的磁场。因此，磁电传感器可用于生物磁测量的假设经常被提及，但从未得到证实。在这篇文章中，这个假设的第一个证明将通过测量人类心脏的（众所周知的）R 波来给出。这可以通过平均来缩小传感器灵敏度和信号电平之间的差距来实现。为了保证平均过程的快速收敛，即使在非常嘈杂的（现实）测量环境中，也指出了时域和频域中不同的自适应平均技术。综合测量的评估表明，与传统的平均方法相比，在 750 个平均周期后，静态测量场景的平均过程在信噪比方面提高了 20 dB。最后，对人类心脏的 R 波进行测量。
Thin-film magnetoelectric sensors are able to measure very low magnetic fields. As a consequence the hypothesis that magnetoelectric sensors could be used for biomagnetic measurements was often mentioned but never proven. In this contribution the first proof of this hypothesis will be given by the measurement of the (wellknown) R-wave of the human heart. This will be achieved by closing the gap between the sensor sensitivity and the signal level by averaging. In order to guarantee a fast convergence of the averaging process even in very noisy (realistic) measurement environments, different adaptive averaging techniques in the time-and frequency-domain are pointed out. The evaluation by synthetic measurements shows an improvement of the averaging process by up to 20 dB in terms of signal-to-noise ratio for an instationary measurement scenario in comparison to the conventional averaging after 750 average periods. Finally, measurements of the R-wave of a human heart are performed.