The Sensitivity of Manganin Stress Gauge

According to the theory of the resistivity of manganin alloy given by K. Yosida, the resistivity is proportional to the following quantities: VDS/Ef, where Ef is the Fermi energy of an electron, V is the volume of the conductor, S is the spin of the manganese ion, D is the exchange integral function. Substituting into the formula of resistance, it is given R/R=D/D－Ef/Ef+S/S+2V/(3V). Then the autor derives the relations of the former three terms in the right hand of this equation to V/V, and by means of the hydrostatic compression curve, gets the relation of R/R with respect to as following R/R0=2.41105p (Pa), the relation with the dynamical pressure is R/R0=2.8105p (Pa). The results are compared with the experimental works both abroad and at home, they are very in accord with each other.