A experimental method to the study of wireless passive LC sensors

R. J. Rodrigues, Renan Melo De Freitas
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引用次数: 2

Abstract

The wireless passive resonant LC sensors studies and developments have had a significant growing in the last two decades because these sensors do not need for power supply, wiring connections and electronics circuits.1,2 These sensors represent great possibilities for monitoring of physiological parameters inside the human body.3 An implantable device has to operate under harsh environment as a blood vessel.2,3 Both development of an implantable intraocular pressure sensor for detection of glaucoma,1 and blood pressure sensor for monitoring blood vessel pressure are application examples.3‒6 The measuring, i.e. pressure in most cases, changes the capacitance of the LC circuit placed within the environment being monitored (Figure 1). Thus the LC resonant frequency is changed as a pressure function. This resonant frequency is detected by a coil, magnetically coupled and outside the sensor environment. A readout circuit is connected to this external coil.6 The coil L1 receives an AC signal from Signal Generator, which induces an electrical current in the coil L2 (Lei de Faraday-Lenz). The energy changes between L2 and the capacitor C induces an electrical current in the coil L1, which will be detected as coupled impedance, measured between (a) and (b) points marked in the Figure 1. The total impedance measured between (a) and (b) points is given by Equation 1.2,7
一种研究无线无源LC传感器的实验方法
无线无源谐振LC传感器的研究和发展在过去二十年中有了显着的增长,因为这些传感器不需要电源,接线连接和电子电路。这些传感器为监测人体内的生理参数提供了巨大的可能性植入式装置必须像血管一样在恶劣的环境下工作。2,3用于青光眼检测的植入式眼压传感器1和用于监测血管压力的血压传感器的开发都是应用实例。3-6在大多数情况下,测量,即压力,会改变置于被监测环境中的LC电路的电容(图1)。因此LC谐振频率作为压力函数而改变。这个谐振频率是由一个线圈,磁耦合和外部传感器环境检测。读出电路连接在这个外部线圈上线圈L1接收来自信号发生器的交流信号,该信号在线圈L2(雷-法拉第-伦茨)中诱导电流。L2和电容器C之间的能量变化在线圈L1中产生电流,这将被检测为耦合阻抗,在图1中标记的(a)和(b)点之间测量。(a)和(b)点之间测量的总阻抗如式1.2、7所示
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