Hitachi, Ltd.

Mitsuko Ito

Masayoshi Kaneyasu

Hideo Arima

Nobuo Sato

Tokio Isogai

Shoichi Iwanaga

Takanobu Noro

Akira Ikegami

Akira Ikagami

A gas detecting apparatus incorporates a number of gas detecting elements which react with a variety of gases and exhibit gas sensitivities differing from one another in dependence on the gas species. The detection patterns obtained by quantitizing the detection outputs of the gas detecting elements are compared with a plurality of standard patterns prepared previously for assumed combinations of gas species and concentrations thereof. On the basis of the standard pattern which is same or most similar to the detection pattern, the gas species is identified.

Gas detecting apparatus

A gas detecting apparatus is disclosed in which detection outputs from a plurality of semiconductor gas detecting elements different in gas detection characteristic from each other and previously-obtained characteristic values of the semiconductor gas detecting elements for a mixed gas are subjected to operational processing to detect one or more specified constituent gases contained in the mixed gas, and in which when the specified constituent gas is detected, the detection information is announced by some means, and also the supply of gas is stopped or a supply gas is diluted.

A gas detector with a layer of gas sensing material comprising an oxide semiconductor, wherein at least one coating layer each of a p-type oxide semiconductor and an n-type oxide semiconductor is provided in a multi-layer arrangement on the surface of said layer of gas sensing material that contacts the gas. The gas detector can selectively identify only specific gases.

Gas detector

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Yokosuka, Japan

Mitsuko Ito