Compact gas cell for simultaneous detection of atmospheric aerosol optical properties based on photoacoustic spectroscopy and integrating sphere scattering enhancement

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL Photoacoustics Pub Date : 2024-01-26 DOI:10.1016/j.pacs.2024.100591

Zhengang Li , Jiaxiang Liu , Zhiqiang Ning , Haichun Xu , Junfang Miao , Ying Pan , Changping Yang , Yonghua Fang

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Abstract

Atmospheric aerosols play a pivotal role in the earth-atmospheric system. Analyzing their optical properties, specifically absorption and scattering coefficients, is essential for comprehending the impact of aerosols on climate. When different optical properties of aerosols are individually measured using multiple devices, cumulative errors in the detection results inevitably occur. To address this challenge, based on photoacoustic spectroscopy (PAS) and integrating sphere (IS) scattering enhancement, a compact gas cell (PASIS-Cell) was developed. The PASIS-Cell comprises a dual-T-type photoacoustic cell (DTPAC) and an IS. IS is coupled with DTPAC through a transparent quartz tube, thereby enhancing the scattering signal without compromising the acoustic characteristics of DTPAC. Concurrently, DTPAC can realize high-performance photoacoustic detection of absorption signal. Experimental results demonstrate that PASIS-Cell can simultaneously invert atmospheric aerosol absorption and scattering coefficients, with a minimum detection limit of less than 1 Mm⁻¹, showcasing its potential in the analysis of aerosol optical properties.

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基于光声光谱学和积分球散射增强技术同时检测大气气溶胶光学特性的紧凑型气体池

大气气溶胶在地球-大气系统中起着举足轻重的作用。分析气溶胶的光学特性，特别是吸收和散射系数，对于理解气溶胶对气候的影响至关重要。当使用多种设备分别测量气溶胶的不同光学特性时，检测结果不可避免地会出现累积误差。为了应对这一挑战，基于光声光谱（PAS）和积分球（IS）散射增强技术，开发了一种紧凑型气体池（PASIS-Cell）。PASIS-Cell 由一个双 T 型光声池 (DTPAC) 和一个 IS 组成。IS 通过透明石英管与 DTPAC 相耦合，从而在不影响 DTPAC 声学特性的情况下增强散射信号。同时，DTPAC 还能实现对吸收信号的高性能光声检测。实验结果表明，PASIS-Cell 可同时反演大气气溶胶的吸收和散射系数，最低检测限小于 1 Mm-1，展示了其在气溶胶光学特性分析方面的潜力。

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来源期刊

Photoacoustics Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

11.40

自引率

16.50%

发文量

审稿时长

53 days

期刊介绍： The open access Photoacoustics journal (PACS) aims to publish original research and review contributions in the field of photoacoustics-optoacoustics-thermoacoustics. This field utilizes acoustical and ultrasonic phenomena excited by electromagnetic radiation for the detection, visualization, and characterization of various materials and biological tissues, including living organisms. Recent advancements in laser technologies, ultrasound detection approaches, inverse theory, and fast reconstruction algorithms have greatly supported the rapid progress in this field. The unique contrast provided by molecular absorption in photoacoustic-optoacoustic-thermoacoustic methods has allowed for addressing unmet biological and medical needs such as pre-clinical research, clinical imaging of vasculature, tissue and disease physiology, drug efficacy, surgery guidance, and therapy monitoring. Applications of this field encompass a wide range of medical imaging and sensing applications, including cancer, vascular diseases, brain neurophysiology, ophthalmology, and diabetes. Moreover, photoacoustics-optoacoustics-thermoacoustics is a multidisciplinary field, with contributions from chemistry and nanotechnology, where novel materials such as biodegradable nanoparticles, organic dyes, targeted agents, theranostic probes, and genetically expressed markers are being actively developed. These advanced materials have significantly improved the signal-to-noise ratio and tissue contrast in photoacoustic methods.