Strain gauge with steel substrate

摘要

A strain gauge has a stainless steel substrate with a dielectric coating comprising two dielectric layers. A circuit comprising conductors, resistors and piezoresistors in a Wheatstone bridge configuration is formed on the dielectric. One dielectric layer is to adhere to the steel and a second is to form a barrier against diffusion of the first layer into the piezoresistor material. An amplification and signal conditioning circuit is applied adjacent the bridge. The steel substrate is to be welded or bolted at its marginal portions to a structure subject to strain.