The capacitive proximity sensor based on transients in RC-circuits

2nd International Conference "Cognitive Robotics"

工业技术;无线电电子学;计算机科学

Yakunin, A.G.^1

AltSTU, Barnaul, Russia^1

关键词: Automation systems;    Capacitive proximity sensors;    Control device;    Measuring electrodes;    Parallel connections;    RC circuits;    Robotic complexes;    Sensitive sensors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/363/1/012007/pdf
DOI  :  10.1088/1757-899X/363/1/012007

来源: IOP

【 摘 要 】

The principle of operation of the capacitive proximity sensor is described. It can be used in various robotic complexes, automation systems and alarm devices to inform the control device of the approach to the sensor sensitive surface of an object. At the heart of the device is the measurement of the change in the current of the transient accompanying the charge of the reference capacitor because of the parallel connection to it the capacitance formed by the sensitive sensor surface and the external object. At the heart of the device is the measurement of the change in the current of the transient accompanying the charge of the reference capacitor caused by the parallel connection to it the capacitance formed by the sensitive sensor surface and the external object. As shown by theoretical and experimental studies, the value of this capacity, depending on the purpose of the device, can vary within very wide limits. In this case, the sensitive surface can be both a piece of ordinary wire several centimeters long, and a metall plate or grid, the area of which can reach units and even tens of square meters. The main advantage of the proposed solution is a significant reduction in the effect of spurious leakage currents arising at the capacitance of the measuring electrode under the influence of pollution and humidity of the environment.