Electric conductivity-measuring material, electric conductivity-measuring film, electric conductivity-measuring device, and electric conductivity-measuring method, as well as electric resistivity-measuring material, electric resistivity-measuring film, electric resistivity-measuring device, and electric resistivity-measuring method

An electric conductivity-measuring method for measuring electric conductivity of a surface or inside of a measurement object by measuring light emission from the surface of the measurement object, comprising steps of:

• forming the electric conductivity-measuring film containing at least one of a fluorescent substance, a luminescent substance, an electroluminescent substance, a fractoluminescent substance, a photochromic substance, an afterglow substance, a photostimulated luminescent substance and a mechanoluminescent substance on the surface of the measurement object;
• and
• emitting charged particles toward the electric conductivity-measuring film;
• wherein the mechanoluminescent substance is:
• a substance represented by SrAl2O4 which is doped with Eu2+;
• a substance represented by SrAl2O4 which is doped with at least one of Eu2+, Ho3+, Dy2+, M1, M2 and M3 (M1, M2, M3=monovalent to trivalent metal ions different from each other);
• or a substance represented by CaYAl3O7 which is doped with Eu2+.

An electric conductivity-measuring method for measuring electric conductivity of a surface or inside of a measurement object by measuring light emission from the surface of the measurement object, comprising steps of:

• forming the electric conductivity-measuring film containing at least one of a fluorescent substance, a luminescent substance, an electroluminescent substance, a fractoluminescent substance, a photochromic substance, an afterglow substance, a photostimulated luminescent substance and a mechanoluminescent substance on the surface of the measurement object;
• emitting charged particles toward the electric conductivity-measuring film, wherein the charged particles have an energy ranging from 1 V/mm to 3000 V/mm;
• and
• applying voltage to the measurement object.