# 동서의료공학과 2005200444 정 진 웅. cf. kinds of several resistive sensor 1)strain gage = changes in L & 2) force sensing resistor = changes in A. 3) thermistor.

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동서의료공학과 2005200444 정 진 웅

cf. kinds of several resistive sensor 1)strain gage = changes in L & 2) force sensing resistor = changes in A. 3) thermistor = changes in T. 4) potentiometer = changes in L.

Principle of FSR F F R R eq) A ∝ F, R ∝ 1/F R F

R ceramic R T NTC (Negative Temp Coefficient) circuit (A) V O VS F VS T ☜ not linear

(B) (C) bridge circuit (D) linearriation R linear range

x A Most capacitor sensors are based on changes in x.

1. Self inductance 2. Mutual inductance 3. Differential inductance ( kinds of Inductance sensor ) F ac LVDT (Linear Variable Differential Transformer.)

+D -D x=0 c case1) when core is at x=0, V cd V fe >> t=0:0.01:2; >> y1=-sin(2*pi*t); >> y2=+sin(2*pi*t); >> plot(t,y1); >> hold on; >> plot(t,y2,'r'); >> clear; +δ+δ -δ-δ

case2) when core is at x=+δ, V cd V fe VoVo >> t=0:0.01:2; >> y1=-sin(2*pi*t); >> y2=2*sin(2*pi*t); >> y3=sin(2*pi*t); >> plot(t,y1); >> hold on; >> plot(t,y2,'r'); >> plot(t,y3,'k'); case3) when core is at x=-δ, V cd V fe VoVo >> t=0:0.01:2; >> y1=-2*sin(2*pi*t); >> y2=+sin(2*pi*t); >> y3=-sin(2*pi*t); >> plot(t,y1); >> hold on; >> plot(t,y2,'r'); >> plot(t,y3,'k');

저번에 메일 보냈던 정진웅 학생입니다. 교수님이 가르쳐 주신대로 주파수를 1000 에서 10000 으로 올리니깐 비슷한 사인곡선은 나오는데 문제와 같이는 도대체 어떻게 해야 할지 감조차 안 오더군요.. 매틀랩 소스라도 한번 보내주시면 안될까요.. 위의 매틀랩은 생각대로 되는데 13 번과 14 번은.. 죄송합니다.

then i=0 piezoelectric sensor has no dc response x q=change, x=deflection Pirzoelectric sensor i(t) ☞ circuit 1)

☞ circuit 2) Piezoelectric sensor i(t) “change amplifier”

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

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