Toyota Jidosha Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Satoshi Fukada

Yoshihiro Deguchi

Masahiro Yamakage

Katsutoshi Goto

Masao Watanabe

Minoru Danno

Masazumi Tanoura

Kenji Muta

Shinichiro Asami

Tomoyasu Iwase

Tokio Okano

A gas analyzer capable of measuring a concentration of a gas component in gas at sensor units provided at a plurality of positions in real time by decreasing the number of signals input from the sensor units to an analyzer so as to reduce a data amount input to the analyzer and a gas analyzing method. The gas analyzing method includes the steps of: demultiplexing laser light by a demultiplexer into measurement laser light and reference laser light; letting the measurement laser light pass through gas to be received by a photoreceiver; finding an absorption spectrum absorbed by a gas component in the gas based on a light intensity of the received measurement laser light and of the reference laser light; and analyzing the absorption spectrum to measure a concentration of the gas component.

Gas analyzer and gas analyzing method

An exhaust gas analyzer of the present invention includes a sensor unitinstalled in an exhaust path from an engine, applies laser light to exhaust gas emitted from the engine and receives laser light that has passed through the exhaust gas so as to measure the concentration of a component contained in the gas based on the received laser light. To an apertureformed in a sensor baseof the sensor unit, an adjustment ringin a circumferential face of which small holesserving as a laser light passage portion is formed and whose inner circumferential face serves as an exhaust gas passage openingis detachably fitted, whereby the sensor unit can be attached so as to conform to different inner diameters of exhaust tubes.

Sensor unit in exhaust gas analyzer

Growing community of inventors

Kobe, Japan

Satoshi Fukada