The Law of Unintended Consequences, or, What is Strain Gage Thermal Output?

In this video, Bob and Kevin discuss about 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.

STC stands for Self-Temperature-Compensation.  The number itself relates to the material coefficient of thermal expansion (CTE) that the gage is intended to be used on.  For example, STC 06 is for low-carbon steel, which has a CTE of approximately 6.7 ppm/°F (12 ppm/°C).  Self-Temperature-Compensation is a technique used when manufacturing the foil strain gage sensor to provide a gage response that minimizes the free expansion of a test part subjected to a change in temperature. 




The effect of short range order on the thermal output and gage factor:

The Law of Unintended Consequences: or, What is Thermal Output? (Article):