Strain Sensors

Abstract

The quantity “strain” — in this context meant to be “linear strain” — in an elastic body is defined as the ratio ε=Δl/l₀, where Δl is the increase in length and /0 is the length in a reference state to be specified. The unit for strain in the SI (Système International) is “one” i.e. 1 ε= 1 = 1 m/m. In practice, the “unit” for strain is called “strain” and the symbol e is used. Usually, strain is in the order of um/m, i.e. 10^-6, and therefore, the unit “µε” (microstrain) is most commonly used.