| abstract |
Rapid response, highly precise determinations of oxygen partial pressures in internal combustion engines operating with lean air/fuel mixtures are accomplished by using a thin film internal reference, solid electrolyte electrochemical type oxygen sensor comprising laterally disposed galvanic sense and pump cells on a single planar substrate, and an internal reference gas chamber provided by a cap. A cerium dioxide, thin film electrode on the galvanic pump cell provides an oxygen reservoir for the internal reference gas chamber. |