现有的接近传感器倾向于依靠磁性感应，不情愿或HALL效应设备来表现其性能特性，在诸如汽车点火传感器之类的应用中，它们会导致运行性能差。现在，牛津的研究人员大学's Physics Department have developed an extraordinarily versatile proximity sensor that uses RF signals to detect the motion of a多种金属和非 -金属，从汽车悬架，变速箱和发动机管理系统中的位置或速度传感器进行大量潜在应用，以检测不均匀液体流动的变化，例如血液/盐水，油中的水或油中的油水混合物。 RF传感器如何与更常规的传感器不同’用于汽车行业中位置传感的大多数类型的接近传感器都使用光学或磁场进行操作，’ISIS Innova物理科学项目经理Robert Adams博士解释欧洲杯线上买球说牛津大学技术转移公司Tion Limited。’Over time wear products such as dust, grease or dirt can cover the sensor, degrading its performance. If wear products cover part of our sensor they should not degrade its performance as they will produce a static background signal, which will被电子设备忽略 -它只是更改参数这会引起信号。’ RF传感器的组件RF位置传感器包括三个主要零件封装将单个紧凑型单元 -线圈形射频天线，驱动天线的RF振荡器电路和监测电路，该电路确定了耦合天线和振荡器的行为中是否发生了变化。传感器的原型如图1所示。虽然传感器不需要使用任何特殊材料进行初始专利应用，但亚当斯指出，如果它纯粹用于测量区域中的磁场强度，则欧洲杯足球竞彩一块磁性材料需要be placed adjacent to the coil. ‘The only other instance in which special materials may be required is if the sensor is used to measure motion in extremely hot environments, i.e. 1,000°C, in which case the RF antenna coil is mounted remotely to the electronics and the coil is made of some high- 温度耐受金属，’he says.
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图1。Close up of the RF sensor being used to detect a metal toothed wheel. |
How the RF Sensors Work
传感器通过检测电磁正确的变化来发挥作用构成其“敏感区域”的卷的关系它位于线圈口外面，形成一个近似立方体，其侧面与天线线圈的直径相似。穿过敏感区域的物体或不同材料的存在会导致这种变化。’因为传感器使用电磁场而不是either a purely magnetic or electric field,’解释亚当斯’它对同时侵入敏感体积的材料的磁性和电性能敏感，例如，旋转的金属齿轮穿过敏感区域的牙齿。欧洲杯足球竞彩’Other examples include homogeneous liquid flowing within a pipe located in the sensitive region, which contains small bubbles or pieces of solid debris carried along in the flow. As the liquid passes through the sensor a signal is produced that is proportional to the size or mass of the debris and for which the signal type is characteristic of that particular material. RF传感器在材料回收中的应用欧洲杯足球竞彩传感器的电子信号输出的特性可用于区分不同类型的材料，具体取决于其磁性或欧洲杯足球竞彩电的介电特性。’我n plastics recycling, for example, the sensor could be used to discriminate between different types of plastics from their electrical properties,’says Adams.’类似的事情可以为金属做。’ Advantages of the RF SensorThe sensor has advantages over competing devices in that: •我t requires no additional components such as magnets, coils or magnetic circuits •我T可能很小，电子设备可以容纳在100μm平方的硅晶片上 •它具有高信号 -噪声比，can be maximised by optimising the sensor design for a particular application •与众不同电感传感器，其输出是独立的。 概括原型已经been tested as an ignition-timing sensor on an internal combustion engine, and Isis Innovation has been approached by a couple of general bearings manufacturers, an aerospace maintenance equipment company and a couple of car component manufacturers with a view to evaluating the technology.’To date, no licences have由我们的讨论产生的says Adams.’但是，我们目前正在生产一些演示设备来展示技术的功能o these potential licensees.’ |