Differential photoacoustic spectroscopy for flow gas detection based on single microphone

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL

Photoacoustics Pub Date : 2024-05-29 DOI:10.1016/j.pacs.2024.100624

Lujun Fu , Jiangshan Zhang , Yufeng Pan , Ping Lu

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引用次数: 0

Abstract

Differential photoacoustic spectroscopy (PAS) for flow gas detection based on single microphone is innovatively proposed and experimentally demonstrated. Unlike the traditional systems, only one microphone is used to suppress flowing gas noise. Wavelength modulation spectroscopy and second harmonic detection technique are applied in this PAS system with Q-point demodulation for acetylene (C₂H₂) gas detection. The experiment is conducted at 1 atm and 300 K. Different concentrations and flow rates of C₂H₂ from 0 sccm to 225 sccm are detected by using nitrogen (N₂) as the carrier gas, which indicates that the system can respond well to flowing gases while maintaining the noise at the same level. The system response time decreases to 3.58 s while the gas velocity is 225 sccm. The detection limit of 43.97 ppb with 1 s integration time and normalized noise equivalent absorption (NNEA) coefficient of 4.0 × 10^-9 cm^-1 W Hz^-1/2 is achieved at the flow rate of 225 sccm. The firstly proposed differential PAS based on single microphone greatly simplifies the system structure for flow gas detection, which provides a novel route for development of PAS with significant practical implementation prospects.

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基于单个麦克风的用于流动气体检测的差分光声光谱仪

创新性地提出了基于单传声器的流动气体检测差分光声光谱法（PAS），并进行了实验演示。与传统系统不同，该系统只使用一个传声器来抑制流动气体噪声。波长调制光谱学和二次谐波检测技术被应用于该 PAS 系统，并通过 Q 点解调进行乙炔（C2H2）气体检测。实验在 1 atm 和 300 K 条件下进行。使用氮气（N2）作为载气，检测了从 0 sccm 到 225 sccm 的不同浓度和流速的 C2H2，这表明该系统能够很好地响应流动气体，同时将噪声保持在同一水平。当气体速度为 225 sccm 时，系统响应时间缩短至 3.58 秒。在流量为 225 sccm 时，1 秒积分时间的检测限为 43.97 ppb，归一化噪声等效吸收（NNEA）系数为 4.0 × 10-9 cm-1 W Hz-1/2。首次提出的基于单传声器的差分 PAS 大大简化了流动气体检测的系统结构，为 PAS 的发展提供了一条新的途径，具有重要的实际应用前景。

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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.