Article

Article title COMPARATIVE ANALYSIS OF THE ELECTRICAL CIRCUITS OF CAPACITIVE SENSORS
Authors R.N. Nabiyev, G.I. Garayev, R.R. Rustamov
Section SECTION I. INFORMATION-MEASURING SYSTEM
Month, Year 03, 2017 @en
Index UDC 536.22
DOI
Abstract The article were presentsed a comparative analysis of different types of capacitive sensors, taking into account their features, their positive and negative properties. Also were analyzed: the scheme of capacitive sensors of wide consumption; sensor circuits on capacitors; sensor circuits on deployed capacitors; schemes of capacitive sensors with a frequency-setting LC-circuit; schemes of sensors with a quartz resonator; sensor circuits with a suction LC-circuit; circuits with resonant capacitive sensors and circuits with differential capacitive sensors. Apparently, the capacitive sensors with different circuits have distinct advantages and disadvantages. Their main disadvantage is associated with a low level of sensitivity. Thus, the electric circuit of the capacitive sensor, which is used in combination with automated remote protection, is expedient, as primary conditions, to have the following functionalities, such as: the use of an RC generator to generate an operating signal when the antenna capacitance is changed (increased); the use of a bridge circuit with inductively coupled two antennas - symmetrically arranged sensing elements in opposite directions, in order to prevent false triggering, with a change in temperature and humidity of the environment; the use of a quartz resonator and a differential high-frequency transformer, in order to increase the stability of the oscillator frequency and the sensitivity of the device; large range of capacitance change in the sensor; application of a filter with an infinite impulse response in order to protect the sensor from external factors, such as temperature and humidity of the environment; application of algorithmic approach in sensors, with the aim of regulating direct reaction to environmental changes. To ensure the efficient operation of the sensor, in any conditions it is necessary to use the organic integration of the means of protection having the advantages provided above. It was found that such means, with the appropriate combination, it is advisable to operate in an automated manner in a complex form. There were established the optimal technical conditions for man-ufacturing, as well as designing electrical circuits for capacitive sensors of an automated remote security complex, taking into account their universality, high efficiency, reliability, ergonomics and rationality.

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Keywords Security; capacity; sensors; electric; circuit; circuit capacitor.
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