Ultrahigh sensitivity nitrogen oxide measurement system based on ultraviolet-visible waveband absorption spectrum
An absorption spectrum and measurement system technology, applied in the field of ultra-high sensitivity trace gas measurement systems, can solve the problems of no high reflectivity, attenuated light intensity, etc., and achieve the effect of improving measurement sensitivity
Active Publication Date: 2016-03-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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However, since nitric oxide is in the ultraviolet-visible range, the main absorption peak is in the deep ultraviolet band, and the Rayleigh scattering of the atmosphere will strongly attenuate the light intensity, and the current coating technology is limited, so there is no high reflection in the deep ultraviolet band at home and abroad. High-efficiency (>0.9995) lens, it is impossible to use the incoherent broadband cavity to enhance the absorption spectrum in the ultraviolet-visible range to achieve ultra-high sensitivity measurement of nitric oxide
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[0016] The structure diagram of the present invention is as figure 1 As shown, it includes an intake pipe 1 , a filter membrane 2 , a first optical resonant cavity detection unit 3 , a second optical resonant cavity detection unit 6 , an ozone generation unit 4 , a nitric oxide conversion unit 5 , a pump 7 , and an exhaust pipe 8 .
[0017] When the measurement system of the present invention measures, the pump 7 is turned on, and the sampling gas enters the measurement system from the intake pipe 1, and the sampling flow rate is V 1 , the sampling gas first passes through the filter membrane 2 to remove the influence of atmospheric Mie scattering on the measurement, and then enters the first optical resonant cavity measurement unit 3 to obtain the nitrogen dioxide concentration value C NO2 , and then with the ozone generated by the ozone generating unit 4 (flow rate V 2 ) are mixed in the nitric oxide conversion unit 5, the nitric oxide in the sample gas reacts fully with oz...
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Abstract
The invention discloses an ultrahigh sensitivity nitrogen oxide measurement system based on an ultraviolet-visible waveband absorption spectrum. The measurement system comprises a first optical resonant cavity measurement unit, a second optical resonant cavity measurement unit, an ozone generation unit, a nitric oxide conversion unit and a sampling gas passage unit. When the measurement system measures, a sampled gas goes through the first optical resonant cavity measurement unit to obtain the concentration of nitrogen dioxide in the sampled gas and then is mixed with ozone, nitric oxide in the sampled gas fully reacts with ozone and is converted into nitrogen dioxide, and the concentration of nitric oxide in atmosphere is obtained through difference calculation by using the total concentration of nitrogen dioxide in the second optical resonant cavity measurement unit. The measurement system can be used for ultrahigh-sensitivity measurement of nitric oxide and nitrogen dioxide, the measurement sensitivity can reach several PPTs (10<-12>), and is even low, and the measurement sensitivity of the system disclosed in the invention is 1-2 orders of magnitude higher than the measurement sensitivity of nitrogen oxide measuring instruments in the present market.
Description
technical field [0001] The invention belongs to an ultra-high sensitivity trace gas measurement system, and relates to a system suitable for nitrogen oxides (NO&NO 2 ) field of measurement system design. Background technique [0002] At present, air pollution has become an important problem restricting my country's economic development, and nitrogen oxides, as an important pollutant in my country, are the focus of environmental monitoring at present, and nitrogen oxides and other primary pollutants will produce photochemical The reaction produces secondary pollutants, and the photochemical smog formed by the mixture of primary pollutants and secondary pollutants will affect the atmospheric environment and endanger human health. [0003] At present, conventional nitrogen oxide measuring instruments usually use chemiluminescence, such as the 42i nitrogen oxide analyzer of the American ThermoFisher company, the T200 nitrogen oxide analyzer of the American API, etc., all use the...
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IPC IPC(8): G01N21/31
CPCG01N21/314
Inventor 秦敏段俊方武卢雪沈兰兰梁帅西李昂谢品华刘建国刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI