Principles of Biomedical Systems & Devices Principles of ... - Rowan
Principles of Biomedical Systems & Devices Principles of ... - Rowan
Principles of Biomedical Systems & Devices Principles of ... - Rowan
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Strain gage w/ Wheatstone<br />
Bridge<br />
PBS&D – Fall 2004 – Polikar http://engineering.rowan.edu/~polikar/CLASSES/ECE404<br />
υ i<br />
R x<br />
R y<br />
R 2 =A<br />
a<br />
∆υ o<br />
B<br />
C<br />
d<br />
c<br />
R 3 =D<br />
Diaphragm<br />
A<br />
D<br />
R 4 =C<br />
R i<br />
R 1 =B<br />
b<br />
Armature<br />
Strain-gage wires<br />
R<br />
∆V<br />
1<br />
0 = 0 ⇔ =<br />
R<br />
2<br />
Let all R initially be equal to R 0 « R i . If R 1 and R 3<br />
increase and R 2 and R 4 decrease by ∆R, then<br />
∆v<br />
0<br />
=<br />
∆R<br />
R<br />
0<br />
vi<br />
R<br />
R<br />
4<br />
3<br />
R 1<br />
R 4<br />
R 2<br />
R 3