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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Influence of uncertainties in the diameter and refractive index of calibration polystyrene beads on the retrieval of aerosol optical properties using cavity ring down spectroscopy
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Influence of uncertainties in the diameter and refractive index of calibration polystyrene beads on the retrieval of aerosol optical properties using cavity ring down spectroscopy

机译：校准聚苯乙烯珠的直径和折射率的不确定性对使用腔衰荡光谱技术恢复气溶胶光学性质的影响

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摘要

We consider the impact of uncertainties in the refractive index and size of polystyrene beads on the retrieved optical properties of aerosol particles by aerosol cavity ring down spectroscopy (A-CRDS). Polystyrene beads are frequently used to verify and calibrate light extinction measurements by cavity ring down instruments. Any uncertainties in either the polymer particle size or the refractive index can contribute to systematic errors in properties retrieved for any subsequent measurements on other aerosol types. We demonstrate that the tolerances on bead size reported by the manufacturers can lead to a range in the real part of the refractive index of the polymer beads retrieved from A-CRDS measurements of as large as 2.9%. Further, we show that the current uncertainty in the refractive index of polystyrene beads in the visible part of the electromagnetic spectrum limits the accuracy with which the real part of the refractive index of other aerosol types can be retrieved to uncertainties of -0.5% and +0.3% at a minimum. This error should be included in any subsequent retrieval of aerosol optical properties from aerosol cavity ring down instruments that are dependent on polystyrene bead calibration. It is expected that such calibrations could lead to significantly larger uncertainties if the complex part of the refractive index is to be retrieved.
机译：我们考虑了气溶胶腔衰荡光谱法（A-CRDS）的不确定性对聚苯乙烯珠的折射率和大小的影响，对气溶胶颗粒光学特性的影响。聚苯乙烯珠经常用于通过腔衰荡仪器来验证和校准消光测量。聚合物粒径或折射率的任何不确定性都可能导致系统对其他气溶胶类型进行后续测量而获得的性能出现系统误差。我们证明，制造商报告的对珠子尺寸的公差可能导致从A-CRDS测量获得的聚合物珠子的实际折射率范围高达2.9％。此外，我们表明，电磁波谱中可见光部分中聚苯乙烯珠的折射率的当前不确定性限制了可将其他气溶胶类型的折射率的实际部分取回的不确定性，精度为-0.5％和+最低0.3％。以后从气溶胶腔衰荡仪器中重新获得气溶胶光学特性时，都应包括该误差，这些光学特性取决于聚苯乙烯珠的校准。期望如果要获取折射率的复杂部分，则此类校准会导致更大的不确定性。

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