| 摘要 |
PURPOSE:To obtain a gas sensor which has high measurement accuracy and superior durability and response by combining a porous layer as a diffusion rate determining means with a narrow flat space, so as to obtain a sharp characteristic curve stably. CONSTITUTION:This sensor is constituted integrally by laminating an airtight ceramic body 4 made of the same material with a solid-state electrolyte body 2 on the solid-state electrolyte body 2. Further, the discoid flat space 6 which has specific gas diffusion resistance is formed between the electrolyte body 2 and ceramic body 4. An annular electrode 10 is provided on the electrolyte body 2 while exposed in the space 6, an annular electrode 12 is provided on the outside surface of the electrolyte body 2 opposite it, and an electrochemical pump cell is composed of the electrolyte body 2 and electrodes 10 and 12. Further, a columnar porous layer 8 with specific diffusion resistance is provided in a through hole 14 which is open in the electrolyte body 2 at the center part of the space 6 inside the electrodes 10 and 12 to obtain integral structure with the electrolyte body 2. Further, the porous layer 8 is arranged successively to the electrode 10 when viewed in the vertical direction of the space 6. |
