| 摘要 |
PCT No. PCT/JP79/00195 Sec. 371 Date Mar. 14, 1980 Sec. 102(e) Date Mar. 14, 1980 PCT Filed Jul. 26, 1979. An oxygen sensor in which a porous thick membrane (20) of transition-metal oxide and electrode metal thick membranes (14, 16) are provided on a ceramic base and these membranes are coated with a ceramic protective layer. The oxygen sensor in which the transition-metal oxide and the electrode metal are constructed in the forms of thick membranes and the protective layer is formed by plasma spray coating is mechanically tough and permits the gas to diffuse rapidly into the porous structure with rapid variation in the electric resistance depending on an oxygen partial pressure in the gas. Accordingly, the oxygen sensor may be conveniently used for detecting an oxygen content in the waste gas from automobiles.
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