An acoustic levitator design for suspending cosmic dust analogues and aerosol particles in light scattering experiments

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2025-04-22 DOI:10.1007/s10686-025-09994-8

A. Colin, O. Muñoz, F. J. García-Izquierdo, E. Frattin, J. Martikainen, Z. Gray, J. L. Ramos, J. Jiménez, A. Tobaruela, J. M. Gómez-López, I. Bustamante, J. C. Gómez, F. Moreno, A. Marzo

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Abstract

We present a design of an acoustic levitator composed of 35 ultrasonic transducers operating at 40 kHz configured to form a spherical cavity. The acoustic radiation force measured experimentally in the center of the cavity is \({{\varvec{F}}}_{rad}\approx 9.6 mN\), enough for levitating spheres as well as irregular particles of different materials of up to ~ 50 mg. Levitation tests have been performed with particles of different geometries and compositions, including liquid droplets and minerals relevant in studies of atmospheric aerosol and cosmic dust. This device has been deployed in the center of a polar nephelometer set-up to conduct studies of light scattering by irregular solid particles and liquid droplets. Test experiments have been carried out using a 1.5 mm diameter NBK- 7 glass sphere, for which three elements of the scattering matrix have been measured as functions of the scattering angle using a 647 nm diode laser. Mie theory calculations of the scattering matrix elements at this wavelength agree well with the measurements, demonstrating the functionality of the whole device.

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光散射实验中用于悬浮宇宙尘埃类似物和气溶胶粒子的声学悬浮器设计

我们提出了一种由35个工作在40 kHz的超声换能器组成的声学悬浮器的设计，配置形成一个球形腔。在空腔中心实验测量的声辐射力为\({{\varvec{F}}}_{rad}\approx 9.6 mN\)，足以使球体以及不同材料的不规则颗粒悬浮高达50毫克。对不同几何形状和成分的颗粒进行了悬浮试验，包括与大气气溶胶和宇宙尘埃研究有关的液滴和矿物。该装置已被部署在极地浊度计的中心，用于研究不规则固体颗粒和液滴的光散射。用直径1.5 mm的NBK- 7玻璃球进行了测试实验，用647 nm二极管激光器测量了散射矩阵的三个元素与散射角的关系。在该波长处散射矩阵元素的Mie理论计算与测量结果吻合良好，证明了整个装置的功能性。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.