Capacitive proximity sensors are capable of detecting which surfaces?

Capacitive proximity sensors are capable of detecting which surfaces?

• A. Metallic only
• B. Non-metallic only
• C. Metallic and wood
• D. Metallic and non-metallic

Answer: (D)

Capacitive proximity sensors work by measuring changes in capacitance in their electric field when a nearby object with a different dielectric constant than air comes close. Because many materials—metallic and non-metallic alike—affect that field, these sensors can detect both metal and non-metal surfaces. The strength and distance at which detection occurs depend on the material’s properties (dielectric constant, moisture, conductivity), but the capability to sense a wide range of materials makes metallic and non-metallic surfaces detectable. That’s why the best choice is the one that includes both metallic and non-metallic.

Capacitive proximity sensors work by measuring changes in capacitance in their electric field when a nearby object with a different dielectric constant than air comes close. Because many materials—metallic and non-metallic alike—affect that field, these sensors can detect both metal and non-metal surfaces. The strength and distance at which detection occurs depend on the material’s properties (dielectric constant, moisture, conductivity), but the capability to sense a wide range of materials makes metallic and non-metallic surfaces detectable. That’s why the best choice is the one that includes both metallic and non-metallic.