Precision strain measurement component converting mechanical deformation into electrical resistance changes for pressure sensing applications.
A strain gauge or piezoresistor is a precision sensing element that measures mechanical strain by detecting changes in electrical resistance when subjected to deformation. In pressure sensors/transducers, it converts applied pressure into measurable electrical signals through the piezoresistive effect, where material resistance changes proportionally to mechanical stress. These components are typically bonded to a diaphragm or beam that flexes under pressure, with the resulting strain altering the gauge's resistance in a Wheatstone bridge configuration for accurate pressure measurement.
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Strain gauges typically use metallic foil that changes resistance due to geometric deformation, while piezoresistors use semiconductor materials where resistance changes due to the piezoresistive effect in the crystal structure. Piezoresistors generally have higher gauge factors but are more temperature sensitive.
They are bonded to a diaphragm or beam using specialized adhesives, precisely aligned to measure strain in the desired direction. The installation requires surface preparation, proper adhesive curing, and protective coating to ensure long-term stability and accuracy.
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