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Understanding Operational Amplifiers and Strain Gages for Sensor Applications

Learn the basics of operational amplifiers and strain gages, including resistance, strain measurement, bridge circuits, and amplifier circuits for sensor applications. Dive into discrete op-amps, schematic diagrams, switched-capacitor amps, and more.

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Understanding Operational Amplifiers and Strain Gages for Sensor Applications

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  1. Operational AmplifiersandStrain gages National Instruments http://zone.ni.com/devzone/cda/tut/p/id/3642

  2. Resistance • Resistance is Resistivity (r) times L/A

  3. Definition of Strain • percent of length • unitless

  4. Strain Gage • Change of resistance with change in length along active axis

  5. Bridge Circuit • Two voltage dividers • Output voltage is labeled VO

  6. Strain Gage Circuit • Tension makes RG+DR higher • Compression makes RG-DR lower • Force F makes VO+ lower in voltage

  7. Strain Gage Amplifier • Note Differential Amplifier • Some elements of bridge with amplifier

  8. Discrete Op-amps

  9. Schematic Diagram

  10. Op-amps embedded in Chips

  11. Switched-Capacitor Amp. Residue Amplifier

  12. Schematic

  13. Comparator

  14. Die Photograph

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