EE 552 · Chapter 3
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What is piezo electric transducer? What are the materials used in such transducer? Define voltage sensitivity, charge sensitivity and derive the expression for the output voltage developed due to applied force.
Explain the principles of operation of capacitive sensor. Also explain how linear relation between output and input can be obtained when capacitive sensor works on the principle of change in separation distance.
A capacitive transducer is made up of two concentric cylindrical electrodes. The outer diameter of the inner electrode is 3mm and the dielectric medium is air. The inner diameter of the outer electrode is 3.1 mm. Calculate the dielectric stress when a voltage of 100V is applied across the electrode. Is it within the safe limit? The length of the electrode is 20mm. Calculate the change in capacitance if the electrode is moved through a distance of 2mm. The breakdown strength of air is 3KV/mm.