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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.

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Presentation on theme: "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."— Presentation transcript:

1 동서의료공학과 정 진 웅

2 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.

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

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

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

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

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

8 +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

9 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');

10 저번에 메일 보냈던 정진웅 학생입니다. 교수님이 가르쳐 주신대로 주파수를 1000 에서 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.

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

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

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

14


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