A multi-pass differential photoacoustic spectrometer at 1064 nm for ambient aerosol absorption

IF 6.8 1区医学 Q1 ENGINEERING, BIOMEDICAL

Photoacoustics Pub Date : 2025-09-10 DOI:10.1016/j.pacs.2025.100769

Jie Chen , Xianmei Qian , Wenyue Zhu , Qiang Liu , Jianjie Zheng , Tao Yang , Tengfei Yang

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Abstract

Accurate atmospheric aerosol absorption measurements are critical for advancing our understanding of global climate effects and reginal meteorological processes. In this paper, a multi-pass differential photoacoustic spectrometer (MP-DPAS) worked at 1064 nm, was developed for the in-situ measurement of atmospheric aerosol absorption coefficients (Abs). By employing the multi-pass configuration, 22 reflections of the incident laser were achieved, thereby the photoacoustic signal was enhanced by a factor of ten. Meanwhile, the differential configuration not only suppress background noise but also amplifies the signal by a factor of two. Consequently, the MP-DPAS achieved a minimum detection limit of 0.05 Mm⁻¹ within an integration time of 110 s and a precision of 1.4 Mm⁻¹. The accuracy of the MP-DPAS was validated by comparing the measured Abs with the calculated Abs of Mie scattering theory and the variation of particle size distribution measured by SMPS (Scanning Mobility Particle Sizer).

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1064 nm的多通差分光声光谱仪用于环境气溶胶吸收

准确的大气气溶胶吸收测量对于提高我们对全球气候影响和区域气象过程的理解至关重要。本文研制了一种工作波长为1064 nm的多通差分光声光谱仪（MP-DPAS），用于大气气溶胶吸收系数（Abs）的原位测量。通过采用多通道结构，入射激光的22次反射被实现，从而光声信号被提高了十倍。同时，差分结构不仅可以抑制背景噪声，还可以将信号放大两倍。因此，MP-DPAS在110 s的积分时间内实现了0.05 Mm−1的最小检测限和1.4 Mm−1的精度。通过与Mie散射理论计算的Abs值进行比较，以及SMPS（扫描迁移率粒度仪）测量的粒径分布变化，验证了MP-DPAS的准确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.

A multi-pass differential photoacoustic spectrometer at 1064 nm for ambient aerosol absorption

Abstract

A multi-pass differential photoacoustic spectrometer at 1064 nm for ambient aerosol absorption