| 摘要 |
PURPOSE:To enable measurement of pressure of an atmospheric gas due to current flowing with gas ions as the carrier, by a method wherein porous electrodes are provided on both sides of a solid electrolyte with one thereof as anode and the other as cathode and a gas diffusion control body is provided covering the cathode to apply a voltage between both the electrodes under a low pressure. CONSTITUTION:An anode 12 and a cathode 13 are provided on both surfaces of a solid electrolyte 11; when a voltage is applied between both the electrodes of the solid electrolyte 11 heated with a heater 16, oxygen contained in a gas is reduced with the cathode 13 to become oxygen ions, which are transferred to the anode 12 through an oxygen ion vacancy in the solid electrolyte 11 to make current flow with the oxygen ions as the carrier. A plateau is generated at an area where the voltage is applied with the control of the diffusion of oxygen through a gas passage hole 15 provided on a gas diffusion control body 14. The so-called threshold current value IL at the plateau is proportional to the concentration of oxygen in a gas, thereby enabling an oxygen sensor to detect the concentration of oxygen from the current value IL. |
