|発明の名称||OXYGEN AND OXIDE ION SENSOR, AND ITS USE|
PROBLEM TO BE SOLVED: To provide an oxygen sensor usable in a wide temperature range, without consuming an electrode and an electrolyte, and capable of detecting precisely an oxygen concentration stably over a wide oxygen concentration area, and its use.
SOLUTION: This oxygen sensor is provided with the first electrode 11 containing a carbon material having an sp3 bond, the second electrode 12 functioned as a reference electrode, an electrolyte phase 13 contacting with the first and second electrodes, and having a molten salt containing an oxide ion, a potential difference measuring part 14 for measuring a potential difference between the first and second electrodes, and a calculation means for calculating the oxygen concentration, based on a measured result obtained by the potential difference measuring part 14, and an oxide ion concentration in the electrolyte phase 13, when the oxide ion concentration in the electrolyte phase 13 is known. The oxygen sensor is usable in the wide temperature range, without consuming the electrode and the electrolyte, and detects precisely the oxygen concentration stably over the wide oxygen concentration area. The oxide ion concentration in the molten salt is also measured by the same manner when the oxygen concentration is known.
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