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The “Strain-Gauge Thermocouple”: A novel device for simultaneous strain and temperature measurement

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3 Author(s)
Cappa, P. ; Department of Mechanics and Aeronautics, University of Rome “La Sapienza,” Via Eudossiana 18, 00184 Rome, Italy ; Marinozzi, Franco ; Sciuto, Salvatore Andrea

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A novel methodology for simultaneous strain and temperature measurements by means of an ac powered electrical resistance strain gauge connected to a strain conditioner using thermocouple wires is proposed and validated. To this aim a specific device has been designed and implemented; the characteristics of the electronic circuit for signal conditioning have then been tested in order to determine the overall performances in temperature and strain measurements. The field verification of the method is conducted by imposing strain fields in the range from 0 to about 700 μm/m and temperature variations in the range from -10 to 100 °C. The difference between the strain measured by the proposed device and the one evaluated by a conventional digital strain meter was always less than 4 μm/m while the mean temperature discrepancy was 0.5 °C with respect to the reference temperature measured with a K-type thermocouple. Finally, compensation of temperature effects on the actual strain value has been performed while the temperature ranges from ambient to 100 °C with a residual error value of 1.4±1 μm/m. © 2001 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:72 ,  Issue: 1 )

Date of Publication:

Jan 2001

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