Advantages of a half bridge over a full bridge (wheatstone)

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SUMMARY

The discussion centers on the advantages of using a half Wheatstone bridge over a full Wheatstone bridge in strain measurement applications. While a full bridge configuration provides double the sensitivity (Vout = NEGS/4 with N=4), a half bridge requires only half the number of strain gauges, making it a cost-effective solution. Additionally, the reduced wire count for a half bridge is beneficial for remote sensors, where minimizing impedance wire count is crucial. The choice between configurations also depends on the specific application and type of strain being measured.

PREREQUISITES
  • Understanding of Wheatstone bridge configurations (full and half bridge)
  • Knowledge of strain gauge types I and II
  • Familiarity with impedance and its impact on sensor performance
  • Basic principles of strain measurement and applications
NEXT STEPS
  • Research the cost implications of different Wheatstone bridge configurations
  • Explore the types of strain gauges and their specific applications
  • Learn about impedance matching techniques for remote sensor applications
  • Investigate the impact of wire count on sensor performance in various environments
USEFUL FOR

Engineers, researchers, and technicians involved in strain measurement, sensor design, and applications requiring cost-effective and efficient sensor configurations.

GBA13
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Homework Statement


Hi Guys,

I know that, when measuring strain using gauges, using a full wheatstone bridge over a half bridge will give you double the sensitivity (Vout = NEGS/4, with N=2 for half and N=4 for full). But why would you use a hald bridge over a full one? What are the advantages?

Thanks.

Homework Equations

The Attempt at a Solution


I can think of cost, you only need half the number of gauges.
 
There are 1/4, 1/2, and full bridge gauge arrangements each with their own advantages. These come in types I and II. Which type are you referring to?

However, one of the main concerns with remote sensors stationed away from power sources and sensing amplifiers is the number balanced impedence wire count. What is the wire count required for a half bridge vs. full bridge (for the sensor types you have been introduced to)?

The specific application (what sort of strain is being measured?) also dictates the type of sensor arrangement is most applicable.
 

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