Title:
METHOD AND EQUIPMENT FOR DETECTING GAS CONCENTRATION
Document Type and Number:
Japanese Patent JPH1123450
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To separate a resonant signal from an unresonant signal without requiring any precise and intricate wavelength discriminator, e.g. a high resolution spectrometer or a narrow band interference filter, and to measure the gas concentration without being affected by fluctuation in the irradiating atmosphere or the laser intensity. SOLUTION: The method for detecting the gas concentration comprises a step for irradiating a region 2 to be measured with a wide band laser light 1, a step for collecting the backscattering light 4 from the region 2, a step for splitting the backscattering light 4 into light beams 6a, 6b, a step for passing one light beam 6a through a high concentration gas to be measured to a first photodetector 10a and passing the other light beam 6b, as it is, to a second photodetector 10b, and a step for calculating the mean gas concentration in the region 2 to be measured based on the intensity of backscattering light detected by the photodetectors 10a, 10b.
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Inventors:
NAKAGAWA JUN
KATSUMATA KENJI
KATSUMATA KENJI
Application Number:
JP18330997A
Publication Date:
January 29, 1999
Filing Date:
July 09, 1997
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
G01N21/27; (IPC1-7): G01N21/27
Attorney, Agent or Firm:
Nao Okuyama (2 outside)