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Operational Amplifiers and Strain gages

Operational Amplifiers and Strain gages. National Instruments http://zone.ni.com/devzone/cda/tut/p/id/3642. Resistance. Resistance is Resistivity ( r ) times L/A. Definition of Strain. percent of length unitless. Strain Gage. Change of resistance with change in length along active axis.

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Operational Amplifiers and Strain gages

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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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