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Miniature Plasma Sprayed Strain Gauges for Torque Sensing

  • : Tervo, J1
  • : 1VTT Technical Research Centre of Finland
  • : PDF Download
  • : 2012


Direct Write Thermal Spray (DWTS) is a novel plasma spraying method that can be used to manufacture sensor structures on 2D- or 3D-surfaces. The method is developed and marketed by Mesoscribe Ltd. Minimum line width with present tooling is 150 ヘm with thickness of 10 ヘm - 1mm. Choices of powder materials include metals, alloys, ceramics and polymers. Resulting materials can be conductors, insulators or semiconductors. We have demonstrated the ability of the method to produce strain gauges and their applicability in dynamic torque measurement. Strain gauges were sprayed on opposite sides of dia. 20 mm stainless steel shafts and finished with laser. Pulsating load (4000 ? 9000 cycles) was applied to produce elastic torsion of 2deg. Standard HBM 1-XY41-6/350 strain gauges were used as reference. The sprayed structures produce results that are comparable to commercial strain gauges. Thus, the presented method can be applied for direct deposition of sensors on components.


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