ДИФФЕРЕНЦИАЛЬНО-ЕМКОСТНОЕ УСТРОЙСТВО С ДВУМЯ АВТОГЕНЕРАТОРАМИ

Abstract

The article describes the structure, design, installation, functionality, technical parametersof a capacitive device used in security and warning systems for the perimeters of objects, as wellas a circuit of a patented differential-capacitive sensor with two autogenerators, which is part ofthe device, the probability of detecting unauthorized intrusions is calculated and estimated usingthe device. The operation of the capacitive sensor is found in the transformations of the change inthe capacitance of two sensitive elements relative to the Earth, the possibility of a protective fence,the change in frequency using autogenerators when approaching or touching them on externalfaces, and the principle of operation of the capacitive device is based on detecting detection whenthe frequency difference of the autogenerators exceeds the set limit value. The advantage ofautogenerators circuits built on logic elements in a differential capacitive sensor is shown, to theinputs of which sensitive elements are connected, one of which is used as a signal, and the other asa reference generator. It is shown that when RLC-elements with lumped parameters and quartzresonators are not used as frequency counters, the circuits of self-oscillators built on digitalmicrocircuits according to the same scheme and their adaptation to changes in the externalenvironment are greatly simplified. happens automatically. To transfer the high frequency signalsof the generators to the laptop, first these signals are converted into low frequency signals throughfrequency dividers, which are in the frequency counters, then these low frequency signals areconverted into digital signals using the Arduino Uno module. The software written on the laptopcalculates the frequency difference and generates an alarm at a certain value of the difference.According to the calculations, a rather high probability of detecting unauthorized intrusions onobjects and the efficiency of using a security warning device with a differential capacitive sensorbased on two self-oscillators in the aviation security system were noted.