GAS ANALYZING DEVICE AND GAS ANALYZING METHOD

摘要

An object of the invention is to provide 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 transmit to the analyzer, thus reducing a data amount input to the analyzer. A gas analyzing method of the present invention includes the steps of: demultiplexing laser light by a demultiplexer 22 into measurement laser light and reference laser light; letting the measurement laser light pass through gas to be received by a photoreceiver 25; finding an absorption spectrum absorbed by a gas component in the gas based on a light intensity of the received measurement laser light and a light intensity of the reference laser light; and analyzing the absorption spectrum to measure a concentration of the gas component. The measurement laser light is applied to the gas through an optical attenuator 23, and the optical attenuator is controlled so that the light intensity of the measurement laser light that has passed through the gas has a predetermined relationship with the light intensity of the reference laser light.