Solving the inverse problem for coarse-mode aerosol particle morphology with digital holography.

Solving the inverse problem for coarse-mode aerosol particle morphology with digital holography.
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通过数字全息图解决了粗模式气溶胶颗粒形态的逆问题。

DOI:
10.1038/s41598-017-09957-w
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发表时间:
2017-08-24
期刊:
影响因子:
4.6
通讯作者:
Holler S
Holler S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Berg MJ;Heinson YW;Kemppinen O;Holler S

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粗模式大气气溶胶颗粒在农业、沙漠和城市环境中丰富。准确表征这些颗粒的形态是科学和应用背景下的重要需求,特别是为了增进我们对此类气溶胶如何影响大气的太阳辐射强迫的理解。弹性光散射是以非接触方式研究气溶胶颗粒的标准方法,其中测量的散射图案被解释为推断颗粒形态。部分由于这些测量中缺乏波相信息,推断并不唯一,这一困难通常被称为反演问题。另一种方法是数字全息术,其中波相位信息被编码在测量中。我们表明,数字全息术和空间过滤可以解决自由流动气溶胶颗粒的逆问题,因为测量的散射图案可以与产生它的颗粒尺寸、形状和方向唯一相关。
Coarse mode atmospheric aerosol particles are abundant in agricultural, desert, and urban environments. Accurate characterisation of these particles’ morphology is an important need in scientific and applied contexts, especially to advance our understanding for how such aerosols influence solar radiative forcing of the atmosphere. Elastic light scattering is a standard method to study aerosol particles in a contact-free manner, wherein measured scattering patterns are interpreted to infer particle morphology. Due in part to the absence of wave-phase information in these measurements, the inference is not unique, a difficulty generally known as the inverse problem. An alternative approach is digital holography where wave-phase information is encoded in the measurements. We show that digital holography and spatial filtering can solve the inverse problem for free-flowing aerosol particles in the sense that a measured scattering pattern can be uniquely associated with the particle size, shape, and orientation producing it.
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