METHOD FOR MEASURING CONCENTRATION OF NITROGEN DIOXIDE IN ATMOSPHERE BY SINGLE WAVE LENGTH LASER INDUCED FLUORESCENCE METHOD AND DEVICE FOR MEASURING CONCENTRATION OF NITROGEN DIOXIDE BY USING IT

摘要

PROBLEM TO BE SOLVED: To provide a method capable of simply and accurately measuring concentration of nitrogen dioxide on a pptv level, and a device using the method. SOLUTION: A single wavelength laser beam 2 is irradiated to each of the atmosphere to be measured 5 and the reference atmosphere 6 obtained by removing nitrogen dioxide from the atmosphere to be measured 5, and intensity of light generated by the atmosphere to be measured 5 and intensity of light generated by the reference atmosphere 6 are individually measured. Concentration of the nitrogen dioxide in the atmosphere to be measured is measured by subtracting the intensity of light generated by the reference atmosphere 6 from the intensity of light generated by the atmosphere to be measured 5. The reference atmosphere 6 obtained by removing the nitrogen dioxide is formed by passing the atmosphere to be measured 20 through a diffusion scrubber 19 formed by applying titanium oxide powder onto its tube wall.