IMC CANSAS - Page 186

186 Measurement Technique
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
5.1.2.1.7 Full bridge with Poisson strain gauges in opposed branches
N
4
K
U
U
B
IN
U
IN
U
B
1 2
34
12 34
1
2
3
4
12N
Two active WSGs are positioned along the longitudinal strain and are joined by two transversally
positioned WSGs to complete the bridge (torsion bar arrangement). In the bridge, the longitudinal strain
gauges are located in opposite branches. This circuit provides better exploitation of transversal
contraction and longitudinal force as well as good temperature compensation. In this arrangement, the
transversal expansion coefficient must be specified. The strain is computed as:
5.1.2.1.8 Full bridge with Poisson strain gauges in adjacent branches
N
4
K
U
U
B
IN
12N
U
IN
U
B
1 2
34
12
34
1
2
3
4
Two active WSGs are positioned along the main direction of strain. These two are completed with two
transversally positioned WSGs. In the bridge, the two longitudinal strain gauges are in adjacent bridge
arms. This circuit offers improved sensitivity to the moment of bending and simultaneously compensates
longitudinal force, torque and temperature.