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基于氙灯的非相干宽带腔增强吸收光谱系统,并将其应用于痕量气体及气溶胶消光系数的测量.该系统的探测灵敏度通过测量NO_2在520—560 nm波长范围内的吸收得到验证,最小可探测灵敏度为1.8×10~(-7) cm~(-1)(1σ,0.12 s积分时间,50次平均),对应的NO_2探测极限～33 nmol/mol.结合标准气溶胶粒子发生系统,测量了不同浓度的单分散硫酸铵气溶胶粒子在532 nm波长处的消光系数,得到粒径为600 nm的硫酸铵气溶胶的消光截面为1.12×10~(-8)cm~2,与文献报道值1.167×10~(-8)cm~2相一致,验证了气溶胶测量的可行性和准确性.
Xenon lamp based incoherent wideband cavity enhanced absorption spectroscopy system and its application to the trace gas and aerosol extinction coefficient measurement.The detection sensitivity of this system is verified by measuring the absorption of NO 2 in the wavelength range of 520-560 nm, The detection sensitivity is 1.8 × 10 -7 cm -1 (1σ, 0.12 s integration time, 50 averages), and the corresponding detection limit of NO 2 is ~ 33 nmol / mol. Combined with the standard aerosol particle generation system, The extinction coefficient of the monodisperse ammonium sulfate aerosols at 532 nm was measured. The extinction cross section of the ammonium sulfate aerosol with the particle size of 600 nm was 1.12 × 10 -8 cm -2. Compared with the literature The reported values of 1.167 × 10 -8 cm -2 agree well with the feasibility and accuracy of aerosol measurements.