RESISTIVE, CAPACITOR, INDUCTIVE, PIEZOELECTRIC SENSOR 2006200401 Tae-eui, Kim.

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Presentation transcript:

RESISTIVE, CAPACITOR, INDUCTIVE, PIEZOELECTRIC SENSOR Tae-eui, Kim

Resistive Sensor ① Strain gage : changes in ② Force sensing resistor : changes in A ③ Thermistor : change in T ④ Potentiometer changes in L

Forcing Sensing Resistive

Thermister ceramicR NTC(Negative Temperature Coefficient) Thermister cf) PTC(Positive Temperature Coefficient)

(A) Voltage Divider (B) Inverting Amplifier

(C) Bridge Circuit (D) Linearization Linear region

Capacitive Sensor Most capacitive sensors are based on changes in

Inductive Sensor ① Self Inductance ② Mutual Inductance ③ Differential Inductance

Inductive Sensor ① Self Inductance

Inductive Sensor ② Mutual Inductance Don’t know where it is

Inductive Sensor ③ Differential Inductance LVDT(Linear variable Differential Transformer) a b c d e f Primary coil

Inductive Sensor (a) When core is at ; cancelled out

Inductive Sensor (b) When core is at

Inductive Sensor (c) When core is at Adventage of LVDT ; You have wide of range of measuring

Problem 13

Rectifier + LPF

Problem 13 Rectifier + LPF

Problem 13 phase – sensitive demodulation

Problem 13 phase – sensitive demodulation

Problem 14

Piezoeletric Sensor ifthen Piezoelectric sensor has no dc response You cannot measure static, but dynamic Microphone, pulse

Piezoeletric Sensor

② Charge Amplifier

Piezoeletric Sensor If you plan to use the piezoelectric sensor for measuring pulse, the lowest frequency of pulse signal is assumed to be 0.1Hz