Ceramic static-strain gauges capable of generating mechanical-strain signals much larger than spurious thermal signals have been invented. These gauges are intended for use at temperatures from room temperature to 1,250 °C. Heretofore, external circuits have been used to provide temperature compensation for (that is, to correct for or suppress the spurious signals of) strain gauges. No such external temperature-compensation circuits are needed for temperature compensation of the present developmental strain gauges.

There are numerous potential uses for self-temperature-compensated strain gauges as the transducers of strain and pressure sensors in automotive and aerospace applications that involve temperatures >200 °C. At the present stage of development, it is not yet possible to construct a single gauge of this type that can operate over the entire temperature range from room temperature to 1,250 °C; instead, one can construct one gauge that functions from 100 to 800 °C and another gauge that functions from 900 to 1,250 °C. Development efforts continue and are expected to lead to publication in a journal.

This work was done by Otto J. Gregory of the University of Rhode Island for Glenn Research Center.

Inquiries concerning rights for the commercial use of this invention should be addressed to

NASA Glenn Research Center
Commercial Technology Office
Attn: Steve Fedor
Mail Stop 4 —8
21000 Brookpark Road
Ohio 44135.

Refer to LEW-16704.