Thermal and magnetic correlation in apparent strain down to 4.2 K and up to 6 T on strain gauges

摘要

In recent years the exceptional development of cryogenic technology in connection with applications in the fields of superconductivity, research concerning particle acceleration, thermonuclear fusion and in the spatial sector, has clearly shown the necessity of characterizing materials and transducers suitable to operate in the range from room temperature to that of liquid helium (4,2 K). Besides fulfilling its institutional tasks of the realization and maintenance of the primary standards of thermal and mechanical quantities, the Istituto di Metrologia “G. Colonnetti” (IMGC-CNR), now Istituto Nazionale di Ricerca Metrologica (INRIM) carries out also work concerning the metrological characterization of sensors and transducers. In particular was undertaken a work for the characterization of stress/strain sensors to be used at cryogenic temperature and in high magnetic fields. The present paper describes the IMGC facilities for strain gauge characterization from room temperature down to 1.53 K. Apparent Strain and Gauge Factors (K) are given from 293 K to 4.2 K and for high magnetic fields (from 0 T to 6 T).