The Law of Unintended Consequences, or, What is Strain Gage Thermal Output?
To aid our understanding of strain gage sensor thermal output, it is helpful to first understand thermal expansion. Often called Temperature Coefficient of Expansion (TCE) or Coefficient of Thermal Expansion (CTE), all materials change dimensions when subjected to a temperature change. Some, such as unfilled polypropylene, change more than others, e.g., titanium silicate. The temperature response of rolled-foil strain gages can be adjusted for a broad range of materials (TCEs), minimizing the residual thermal output over an extended temperature range.