Active passive transducers slideshare

Active passive transducers

1. Passive transducer Device which derive power reqd. for transduction from auxiliary power source - externally powered Eg : resistive, inductive, capacitive Without power they will not work

2. Active transducer No extra power reqd. to produce I/p Self generating Draw power from input applied Eg. Piezo electric x’tal used for accelartion measurement

3. Analog transducer convert I/p quantity into an analog o/p Analog o/p- a continuous fn. Of time Eg. Strain gauge, L VDT, thermocouple

4. Digital transducer Converts I/p into an electrical o/p in the form of pulses

5. Types of pressure transducers Gravitational eg : manometer Elastic – force converted to strain eg . Diaphragm, capsule, bellows, bourdon tubes

6. Resistive Position Transducers 6 Example 1 An RPT with a shaft stroke of 5.5 inches is applied in the circuit as below. The total resistance of the potentiometer is 4.7kΩ. The applied voltage is E T = 3V. When the wiper is 0.9 in. from B, what is E out ?