Purchasing Torsional Strain Gauges

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Torsional strain gauges are not a specific product; instead, strain gauges measure direct strain. For torsion in circular shafts, shear strain occurs on the surface, which can be captured using standard strain gauges positioned at 45 degrees to the axis. A strain gauge rosette, consisting of three gauges arranged 120 degrees apart, can effectively measure two-dimensional strain fields. Users seeking to measure torsional effects should consider these alternative configurations rather than looking for a specialized torsional strain gauge. Understanding these principles is essential for accurate strain measurement in engineering applications.
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Does anyone know where I can purchase a torsional strain gauge? Website? Company?
Thanks
 
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I don't think there is sich a thing as a "torsional strain gauge". Strain gauges measure direct strain. If you have torsion in a circular shaft for example, there is a shear strain on the surface of the shaft which is equivalent to equal and opposite direct strains at 45 degrees to the axis of the shaft. So you just use two "ordinary" strain gauges at 45 degrees to the axis.

A strain gauge rosette with 3 gauges 120 degrees apart will measure any two-diimensional strain field.
 

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