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A wireless flow sensor based on magnetic higher-order harmonic fields

机译：基于磁场高次谐波场的无线流量传感器

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摘要

The design and fabrication of a wireless, passive flow sensor based on changes in magnetic higher-order harmonic fields is described. The sensor consisted of a flow channel, a permanent magnetic strip (biasing element) and a magnetically soft ferromagnetic strip (sensing element). The biasing element was attached on the channel's wall in parallel to the flow direction, while the sensing element was applied on the opposite wall at a small angle to the flow direction. Flowing water in the channel created a pressure on the sensing element's surface, causing a deflection that varied its separation distance from the biasing element. The change in the separation distance in turn altered the biasing field experienced by the sensing element, causing a shift in its higher-order harmonic fields that could be measured remotely through a magnetic coil. The novelty of this sensor is its wireless, passive nature, which is ideal for applications where wire connections are prohibited. In addition, this sensor can be used on a disposable basis due to its simple design and relatively low material cost.
机译：描述了一种基于磁高阶谐波场变化的无线被动流量传感器的设计和制造。传感器由流动通道，永磁条（偏置元件）和软磁性铁磁条（传感元件）组成。偏置元件平行于流动方向安装在通道壁上，而传感元件以相对于流动方向小的角度施加在相对的壁上。通道中流动的水在传感元件的表面上产生压力，导致偏转，从而改变了其与偏置元件的分离距离。间隔距离的变化又改变了传感元件所经历的偏置场，从而导致其高次谐波场发生了偏移，可以通过电磁线圈进行远程测量。该传感器的新颖之处在于其无线，无源特性，非常适合禁止电线连接的应用。另外，由于其简单的设计和相对较低的材料成本，该传感器可以一次性使用。

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