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Strain Gauges in Electronics: Wheatstone Bridge and Elastomer Applications

Dive into the world of strain gauges and electronics with a focus on the Wheatstone Bridge circuit and elastomer strain gauge technology. Learn how to analyze DC circuits, apply strain gauges to structures, and ensure accuracy and reliability through testing.

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Strain Gauges in Electronics: Wheatstone Bridge and Elastomer Applications

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Presentation Transcript

  1. Strain Gauges: Present and Future Applications of Electronics

  2. Objectives: • Analyze series-parallel DC circuits • Build and take measurements in series-parallel DC Circuits • Use innovative and critical thinking to analyze a problem.

  3. In this module, we'll answer the following questions: • How do you “redraw” the Wheatstone Bridge circuit to recognize the series-parallel relationship among the resistors? • How is a strain gauge used in a Wheatstone Bridge? • How does the elastomer strain gauge work? • How can you apply the elastomer strain gauge to a structure? • What tests and evaluations would you need to do to show that the elastomer strain gauge is accurate and reliable?

  4. What is a strain gauge? • Strain Gauge video

  5. Back to Series-Parallel Circuits:The Wheatstone Bridge • Voltage output is zero when the bridge is “balanced” • Ra/Rb = R1/R2

  6. Foil Strain Gauge • One leg of the Wheatstone Bridge

  7. Elastomer Strain Gauge • Graphene particles in Latex • Resistance varies with strain (displacement)

  8. Some things to consider: • Concept of operation • Application examples from the literature • How does it compare with a foil strain gauge in terms of ease of use, reliability, and durability? • What tests would you do to “demonstrate” that elastomer strain gauge is a viable product?

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