Hermetically sealed high temperature strain gage

Abstract From the Canadian patent

A hermetically sealed strain gage for measuring strains of high temperature parts comprises an attachment shim plate which is adapted to be secured to the part to be measured. A first înner cylinder member has one end sealingly secured to the shim plate and a second outer cylindrical member is disposed over the first member and has an end which is also sealingly secured to the shim plate. The outer wall of the inner member is spaced from the inner wall of the outer member and first and second spaced apart capacitor plates are arranged at substantially diametrically opposite sides of the inner cylinder member in spaced relationship, each other. A cover plate is sealingly secured to the …