Generally known temperature compensation techniques for strain gages (like the use of a dummy gage or the implementation of half- and full-bridge configurations) are not applicable to all strain-measurement situations and cannot fully compensate for all sources of error. Digital Enhancement of Analog Measurement Systems presents a universal method of corrections for these effects in which temperature is measured independently of other variables and ex post facto corrections are computed and applied to digitized readings of the analog measurement system.
A single, linear-pattern strain gage, self-temperature-compensated for steel 1018, has been utilized in a quarter-bridge to measure tensile strain in a test specimen of similar material configured as an end-loaded cantilever. Temperature was measured with a platinum RTD in dual, constant current source signal conditioner. After implementing this design approach, digital temperature compensation of strain gages resulted in highly accurate measurements, with an average of about 1% error in the measurements of the known mass over a range of masses and temperatures.
Date of publication
David Beams, Ron Pieper, Premananda Indic
Master of Science in Electrical Engineering
Karimov, Islombek, "Digital Enhancement of Analog Measurement Systems for Temperature Compensation of Strain Gages" (2018). Electrical Engineering Theses. Paper 38.