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OCC SACA Sensor Logic Systems 1 (C-205) Practice Test

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A capacitive proximity sensor uses the principle of what to sense objects?
Correct Answer:
Capacitance
Explanation:
Capacitive proximity sensors rely on changes in capacitance caused by the nearby object altering the electric field around the sensing electrode. The electrode and the object form a capacitor, and as the object approaches, the effective dielectric between the plates increases, raising the capacitance. The sensor’s electronics detect this change (often by a shift in oscillation frequency or charging time) and signal when the object is close enough. This non-contact method is distinct from inductive sensing, which uses magnetic fields to detect metal objects, resistance-based sensing that needs a current path, or reflectivity-based sensing that relies on light.

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