| 摘要 |
PURPOSE: A device for measuring the concentration of gas using a laser multi-passage gas tube is provided to improve accuracy and sensitivity of measurement by using a multi-passage gas tube and increasing optical passages. CONSTITUTION: A device for measuring the concentration of gas using a laser multi-passage gas tube comprises a light source(510), a beam splitter(512) splitting a beam incident from the light source, a standard gas tube(522) inputting and outputting a standard gas and through which the beam split by the beam splitter passes, a corrective light detecting unit(526) converting the light passing through the standard gas tube to an electric signal, a multi-passage gas tube(531) inputting and outputting a test gas, through which the split beam passes through multiple passages and in which discharge occurs, a current detecting unit measuring the concentration of gas by LOG(Laser-opto Galvanic) effect, a measuring light detecting unit(538) measuring the concentration of gas by TDLAS(Tunable Diode Laser Absorption Spectroscopy), and a signal processing unit calculating the concentration of gas by analyzing the signals inputted from the light detecting units.
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