A variable dielectric capacitive sensor as shown in the following figure is used to measure displacement via a Wheatstone bridge. C2 R3 dl E1 E1 Vs Eth C1 Eo = 8.85 x 10-12 F/m E =1 for air Ez=3 for dielectric Length of a capacitor plate = 1 cm Width of a capacitor plate= 1 cm C2 d=5 mm V=5 V Derive the expression for the capacitance C1 and C2 for any displacement x. Find the expression/value of x for a balanced bridge, given R3= R4=100 Q. Derive the expression for the output voltage in terms of x. Comment on the sensitivity of this displacement sensor.

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A variable dielectric capacitive sensor as shown in the following figure is
used to measure displacement via a Wheatstone bridge.
B1 B1.1
R3
d E1
E1
Vs
Eth
C1
Eo = 8.85 x 10-12 F/m
Ez=1 for air
E2=3 for dielectric
Length of a capacitor plate = 1 cm
Width of a capacitor plate= 1 cm
C2
R,
d=5 mm
V=5 V
a) Derive the expression for the capacitance Cı and C2 for any displacement
х.
b) Find the expression/value of x for a balanced bridge, given R3= R4=100
Q.
c) Derive the expression for the output voltage in terms of x. Comment on
the sensitivity of this displacement sensor.
Transcribed Image Text:A variable dielectric capacitive sensor as shown in the following figure is used to measure displacement via a Wheatstone bridge. B1 B1.1 R3 d E1 E1 Vs Eth C1 Eo = 8.85 x 10-12 F/m Ez=1 for air E2=3 for dielectric Length of a capacitor plate = 1 cm Width of a capacitor plate= 1 cm C2 R, d=5 mm V=5 V a) Derive the expression for the capacitance Cı and C2 for any displacement х. b) Find the expression/value of x for a balanced bridge, given R3= R4=100 Q. c) Derive the expression for the output voltage in terms of x. Comment on the sensitivity of this displacement sensor.
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