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    • 4. 发明专利
    • Gas concentration measuring method and apparatus
    • JP5371268B2
    • 2013-12-18
    • JP2008066767
    • 2008-03-14
    • 三菱重工業株式会社
    • 昌純 田浦研二 牟田明生 近藤英治 加藤慎一郎 浅海伊智郎 粟屋篤史 瀧田
    • G01N21/39
    • PROBLEM TO BE SOLVED: To provide a gas concentration measuring method and a measuring apparatus, measuring gas concentration with the usage of a laser beam even in a gas atmosphere where a phenomenon speed is rapid such as combustion flame in a combustion chamber of an internal combustion engine, measuring the gas concentration with the usage of the laser beam even in the atmosphere where a quantity of transmitted light is small such as in an exhaust gas pipe from the internal combustion engine, and securing high noise resistance and measuring sensitivity. SOLUTION: This apparatus is provided with: an amplitude modulation means 24 for modulating the laser beam oscillated from a light source 4 with prescribed intensity; a wavelength modulation means 14 for performing modulation with a prescribed frequency; a light receiving means 30 for making the laser beam subjected to combined modulation by the amplitude modulation means 24 and the wavelength modulation means 14 transmit into a gas atmosphere to be measured and receiving the laser beam; an amplitude demodulation means 44 for taking out a component synchronized to amplitude modulation of light receiving signals; and a wavelength demodulation means 46 for taking out a component synchronized to wavelength modulation. The target signal is acquired by the amplitude demodulation means 44 and the wavelength demodulation means 46, to find the gas concentration. COPYRIGHT: (C)2010,JPO&INPIT