Лако-красочные материалы — производство

An electrical strain gauge mainly consists of a resistance grid of very fine wire or more commonly, metallic foil in a grid pattern, connectors (also called solder tabs) and an encapsulation layer. The grid pattern maximizes the amount of metallic wire or foil subject to strain in the parallel direction. The cross-sectional area of the grid is minimized to reduce the effect of shear strain and Poisson strain. When the object undergoes deformation, the foil is deformed, causing its electrical resistance to change. This change of resistance, usually measured using a Wheatstone bridge, is related to the strain by the quantity known as the gauge factor. Gauge factor is defined as the ratio of fractional change in electrical resistance to the fractional change in length (strain). To connect the strain gauge to the Wheatstone bridge, a minimum of two electric wires is required, with an optional third wire for minimization of the effect of wire resistance upon the strain measurements.