Patent ID: 7514841

Claim:
A method of packaging and mounting a quartz SAW sensor having at least two SAW devices electrically connected to each other on to a shaft, comprising the steps of: providing a glass cover wafer having a diameter substantially the same as said quartz SAW sensor; adding a glass frit paste having a desired pattern on said glass cover wafer to form a pattern of glass frit spacers and thereafter pre-consolidating said glass frit paste, said glass frit spacers having a TCE substantially the same as said glass cover wafer; aligning of said glass cover wafer on said SAW sensor and making direct contact there between to thereby isolate said glass cover wafer and said SAW sensor by said glass frit spacers, said glass frit spacers further isolating said at least two SAW devices; consolidating said glass frit paste at a temperature below the Curie temperature of said quartz SAW sensor to form consolidated solid glass material; slicing said glass cover wafer to expose said at least two SAW devices for making electrical contact therewith; thereafter directly attaching the back of said quartz SAW sensor to a shaft by applying a gel phase of a glass frit composition to a place on said shaft and consolidating said gel phase to a cured glass frit, said glass frit composition having a TCE bridging the TCE of said shaft and the TCE of said back of said quartz SAW sensor; and bonding said back of said quartz SAW sensor to said glass frit composition.