Spatiotemporally synchronized dual-wavelength measurement of aerosol optical properties using a dual-differential sphere-tube coupled photoacoustic-scattering system.

Zhengang Li, Hepeng Zhang, Daming Dong, Yonghua Fang

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Article in Photoacoustics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 authors.

Zhengang LiKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Hepeng ZhangUniversity of Science and Technology of China, Hefei 230026, China.

Daming DongResearch Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.

Yonghua FangKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

To reduce potential inconsistencies in particle transport, temporal response, and microenvironment in conventional split-type aerosol absorption-scattering systems, we developed a dual-wavelength spatiotemporally synchronized measurement method. Two integrating spheres serve as scattered-light collection cavities and acoustic buffers and form a low-frequency differential Helmholtz resonator, while the central tube supports a high-frequency differential second-order longitudinal mode. The 450 and 532 nm lasers were modulated at 2572 and 169 Hz and synchronously demodulated using an FPGA-based digital lock-in amplifier. Absorption channels were calibrated with NO₂, and scattering channels with N₂/CO₂ Rayleigh scattering. At 1 s integration and a 3

Indexed as

Aerosol optical propertiesDual-differential acoustic resonanceIntegrating-sphere nephelometryPhotoacoustic spectroscopySpatiotemporal synchronization

Identifiers

PMID42571256

DOI10.1016/j.pacs.2026.100864

PMCPMC13451899

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.