IMC C SERIES - Page 38

© 2018 imc Test & Measurement GmbH
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19
38 Properties of the imc C-SERIES
4.6.2.2.7 Full bridge with Poisson strain gauges in opposed branches
  N
4
K
U
U
B
IN
U
IN
U
B

1

2

3

4

1

2

3

4

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:
k: gauge factor
Poisson's ratio of test object material
4.6.2.2.8 Full bridge with Poisson strain gauges in adjacent branches
 N
4
K
U
U
B
IN
 
 12N
U
IN
U
B

1

2

3

4

1

2

3

4

1

2

3

4
Full bridge with 4 active strain gauges. 2 active strain gauges complemented by 2 transverse Poisson
strain gauges. They are located in opposed bridge arms. Higher exploitation of transverse contraction
longitudinal expansion while providing good temperature compensation.
k: gauge factor
Poisson's ratio of test object material