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VARIABLE CAPACITIVE TRANSDUCER

VARIABLE CAPACITIVE TRANSDUCER. MR. VISHAL VASISTHA ASSISTANT PROFESSOR (ME) DCE, GURGAON. VARIABLE CAPACITIVE TRANSDUCER. A variable capacitor is a capacitor whose capacitance may be changed Capacitance of two plate capacitor is given by C=KA / t

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VARIABLE CAPACITIVE TRANSDUCER

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  1. VARIABLE CAPACITIVE TRANSDUCER MR. VISHAL VASISTHA ASSISTANT PROFESSOR (ME) DCE, GURGAON

  2. VARIABLE CAPACITIVE TRANSDUCER • A variable capacitor is a capacitor whose capacitance may be changed • Capacitance of two plate capacitor is given by C=KA / t A change in anyone of K, A, t may be used in sensing process • Variable capacitance is used to convert physical phenomena into electrical signals

  3. TYPES OF VCT • CAPACITIVE ROTATION TYPE • CAPACITIVE DISPLACEMENT/PRESSURE TYPE • CAPACITIVE LIQUID LEVEL TYPE

  4. CAPACITIVE ROTATION TYPE • Angular displacement of one of the plates causes change in effective AREA

  5. CAPACITIVE DISPLACEMENT/ PRESSURE TYPE • Displacement of one of the plates changes x (distance between plates)

  6. CAPACITIVE LIQUID LEVEL TYPE • A change in K (depends on dielectric properties of medium between two plates) is produced as the fluid level between the capacitor plate changes

  7. TYPES OF VCT Rotary plate capacitor Thin diaphragm Linear Capacitance Transducer

  8. APPLICATIONS • To tune a radio as tuning capacitors, or antenna tuners

  9. APPLICATIONS

  10. APPLICATIONS

  11. APPLICATIONS • Capacitance microphone • Capacitive Liquid level sensor • Pressure transducer

  12. CAPACITANCE BRIDGE CIRCUIT Compensator Z1 Sensor Z2 AC Excitation Bridge Output vo v  vref + Z3 Z4 Bridge Completion

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