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Pressure sensor using foil strain gauge

Pressure sensor using foil strain gauge

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Pressure sensor using foil strain gauge

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  1. Pressure sensor using foil strain gauge ANU Sensor Lab.

  2. Advantage of metal foil strain gauge • Universal and simple to use • Small/ low mass • Wide frequency range (>50kHz) • Low interaction with measurement object • Excellent linearity over a large strain range • Low and predictable temperature effects • High stability over time • Low costs

  3. Disadvantage of metal foil strain gauge • Relative resistance change very low ( electrical bridge circuit essential) • Temperature application limits • Single use only • Protective measures required against: - Moisture - Temperature ( temperature gradients ) - Ionizing radiation - Magnetic fields

  4. Signal processing circuit Strain gauge Diaphragm (stainless steel) Diaphragm Package Pressure Bonded foil strain gauge pressure sensor

  5. Where Diaphragm design Bending of circular plates with edge fixed The maximum radial stress at the edge The maximum tangential stress at the edge Stress at the center of the plate The maximum deflection occurs at the center

  6. Diaphragm design Resistance variation Output voltage

  7. Circular diaphragm(STS316L) Dimension: a=4.5mm, h=0.2mm Properties: E=193GPa, ν=0.3 Pressure: 2000KPa (20bars)