Fujikura Limited

Sumitomo Special Metals Co., Ltd.

Hitoshi Taimatsu

Masami Ueda

Seiki Kato

Ryouji Nagano

Yukio Matsuki

A limiting current type oxygen sensor having a gas diffusion mechanism comprising a gas diffusion bore and an internal space communicating with the gas diffusion bore for supplying a diffusion-rate-determined gas. The gas diffusion mechanism may be configured such that an oxygen concentration gradient within the internal space satisfies the expression:1=(1/4){()+()}based on the Faraday constant (F); a diffusion coefficient (D); an oxygen concentration (C); a bore area (S) of the gas diffusion bore; a bore length (l) in the axial direction of the gas diffusion bore; a distance (l) in the internal space between the first electrode and the inner surface opposed thereto; an effective cross section (S) of the internal space; and an output current value (I). This makes it possible to accurately sense and measure the oxygen concentration, even at low oxygen concentrations, and achieve easy producibility and cost reducibility.

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Akita, Japan

Hitoshi Taimatsu