Capacitance Proximity Sensor (CPS) is a line-type sensor that detects penetration through openings that are covered by what?

Capacitance Proximity Sensor (CPS) is a line-type sensor that detects penetration through openings that are covered by what?

• A. grill bars or metal shutters
• B. glass panes
• C. wood frames
• D. concrete walls

Answer: (A)

Capacitance sensors detect intrusion by noticing changes in the electric field when something enters the sensing area. A line-type CPS is set up across an opening that is covered by metal grill bars or shutters, which creates a defined conductive path for the field. When a person or object penetrates through that opening, it perturbs the field and changes the measured capacitance along the line, letting the system know there’s a breach. If the opening were covered by glass, wood, or concrete, the barrier either isn’t conductive in the same way or is a solid, non-coupling medium for the field. That makes it much harder for the capacitance change to occur in a detectable, reliable manner, so penetration wouldn’t trigger the sensor as effectively.

Capacitance sensors detect intrusion by noticing changes in the electric field when something enters the sensing area. A line-type CPS is set up across an opening that is covered by metal grill bars or shutters, which creates a defined conductive path for the field. When a person or object penetrates through that opening, it perturbs the field and changes the measured capacitance along the line, letting the system know there’s a breach.

If the opening were covered by glass, wood, or concrete, the barrier either isn’t conductive in the same way or is a solid, non-coupling medium for the field. That makes it much harder for the capacitance change to occur in a detectable, reliable manner, so penetration wouldn’t trigger the sensor as effectively.