Agilent Technologies E1356A Dokumentacja Pobierz pdf (Strona 61)

Poisson 1/2 Bridge

(HPOisson)

In applications where there is no equal strain of opposite sign as there is for

the beam in Figure 4-10, an increase in measurement sensitivity and

temperature compensation is achieved by mounting the strain gages at right

angles on the specimen. Mounting the gages in this manner is known as a

Poisson arrangement and is represented in Figure 4-11. With a Poisson

arrangement, the sensitivity is not as great as with the bending

⁄

bridge;

however, it is approximately 25% greater than a

⁄

bridge arrangement.

Again, since the gages are adjacent legs of the Wheatstone Bridge circuit,

complete temperature compensation is achieved.

Dummy Gage

In a dummy gage configuration, one of the strain gages in the

⁄

bridge

arrangement is mounted to an unstrained portion of the specimen (Figure

4-12). This gage arrangement provides complete temperature

compensation; however, measurement sensitivity is not increased since a

⁄

bridge measurement is made with the one active gage.

Figure 4-12. Dummy Gage Arrangement

Figure 4-11. Strain Gages in Poisson Arrangement

60 Understanding the Strain Gage Multiplexers Chapter 4

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Agilent Technologies E1356A Dokumentacja Strona 61