Question

To reduce the effect of fringing in a capacitive type transducer,

• A. The transducer is shielded and the shield is kept at ground potential
• B. A guard ring is provided and it is kept at ground potential
• C. The transducer is shielded and the shield is kept at the same potential as the moving plate
• D. A guard ring is provided and it is kept at the same potential as the moving plate

Hint:

To minimize fringing effects in capacitive transducers, always ensure that any shield or guard ring is at the same potential as the moving plate to maintain measurement accuracy.

Answer 1

The Correct Option is D

Fringing effects in capacitive transducers occur when the electric field extends beyond the plates of the transducer, affecting the accuracy of measurements. To minimize this effect, a guard ring is often used.
The guard ring is kept at the same potential as the moving plate to ensure that the fringing field does not extend beyond the desired area of measurement. This helps to reduce the undesired influence of fringing, which would otherwise lead to inaccurate readings.
Therefore, the correct method to reduce fringing is to keep the guard ring at the same potential as the moving plate.