摘要:
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.
Abstract:
We report on the development of incoherent broadband cavity enhanced absorption spectroscopy system based on a short arc Xenon lamp for trace gas detection and aerosol optical properties measurements.A minimum detection sensitivity of 1.8×10~（-7） cm~（-1）（1σ,0.12 s integrating time,and 50 times average） is obtained on the basis of absorption spectroscopy of NO_2 in a spectral range of 520-560 nm,which corresponds to a minimum detection concentration of～33 nmol/mol for NO_2.Combining a laboratory aerosol generation system,the extinction coefficients of 600 nm diameter monodispersed ammonium sulfate aerosol are measured under different particle concentrations.A cross-section of 1.12×10~（-8）cm~2 for ammonium sulfate at 532 nm wavelength is obtained, which agree well with the literature result of 1.167×10~（-8）cm~2.The results demonstrate the ability of our system to quantitativly measure aerosol optical properties.
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