| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a stacked-type gas sensor element having high durability and reliability. <P>SOLUTION: This stacked type gas sensor element 1 is formed by directly connecting a solid electrolyte layer 11 containing zirconia and alumina to the first and second insulating layers 21, 22 mainly composed of alumina by simultaneous baking. A portion MZ1 very close to an interference IF1 in the solid electrolyte layer 11 is irradiated with a laser beam, and stress σZ applied to the solid electrolyte layer 11 at the portion MZ1 is determined from the wave number value κpsz of an acquired fluorescence peak, by utilizing the fact that the wave number value of the fluorescence peak, emitted from Cr<SP>3+</SP>ions in alumina crystal particles, is changed by a stress when the laser light is irradiated. When the tensile stress applied to the solid electrolyte layer 11 is smaller than 300 MPa at the maximum, the durability is satisfactory. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
