English to Spanish Tech/Engineering Electronics / Elect Eng capacitive sensors

Capacitive Sensors - Operating Principle
The active element is formed by two metallic electrodes positioned much like an “opened” capacitor (Figure 1). Electrodes A and B are placed in a feedback loop of a high frequency oscillator. When no target is present, the sensor’s capacitance is low, therefore the oscillation amplitude is small. When a target approaches the face of the sensor, it increases the capacitance. This increase in capacitance results in an increased amplitude of oscillation.
The amplitude of oscillation is measured by an evaluating circuit that generates a signal to turn on or off the output (Figure 2).

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