Dept. of Biomedical Engineering YOUNHO HONG

(1)Self inductance (2)Mutual inductance F x Vo Vs + Vo - Magnetic core

(3) Differential inductance (a) when core is at x=0 X=0 +D -D δ -δ-δ a b c d e f VcdVfe Vo

(b) When core is at x=+ δ (c) When core is at x=- δ Vcd Vfe Vo Vcd Vfe Vo

(problem 13.) (a) Skretch output signal of LVDT from 0ms to 10ms.

(b) Write the methods of finding y(t). Method 1 : Full wave Rectifier + LPF Method 2 : phase-sensitive demodulation V(t) Vo(t) FWR +LPF Vo(t)

(ploblem 14.) (a) θ=0. (b) θ=10. +LPF Vo(t)

(c) θ=45. (d) θ=90. To get rid of this effect, We need to multifly.

Piezoelectric cristal x q = kx chargedeflection Piezoelectric sensor has no dc response. (1) Vo(t) Vs(t) X(t)

(2) Vo(t) f |H| Fc=1/2 πRC k/c If you plan to use the piezoelectric sensor, for measuring pulse, The lowest freq of pulse signal is assumed to be 0.1Hz.