使用 2.45 mL Helmholtz 谐振器和 4823.3 nm ICL 光源进行 OCS 的光声痕量气体检测

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL Photoacoustics Pub Date : 2024-04-29 DOI:10.1016/j.pacs.2024.100612

Zijian Gao , Lei Li , Minghui Liu, Shen Tian, Mingyang Feng, Yingying Qiao, Chongxin Shan

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引用次数: 0

摘要

本文提出了一种基于微型光声光谱的气体传感器，利用可调谐中红外带间级联激光器（ICL）和亥姆霍兹光声电池检测亚ppm级硫化羰（OCS）。研究了中心波长为 4823.3 nm 的可调谐 ICL 的调谐特性，以获得最佳驱动参数。为了使测量系统小型化，设计并优化了一个体积为 2.45 mL 的亥姆霍兹光声电池。通过优化调制参数和信号处理，验证了该系统对 OCS 浓度具有良好的线性响应。锁定放大器的积分时间为 10 秒，在差分模式下，1σ 噪声标准偏差为 0.84 mV，在常压和室温条件下，最低检测限 (MDL) 为 409.2 ppbV。

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Photoacoustic trace gas detection of OCS using a 2.45 mL Helmholtz resonator and a 4823.3 nm ICL light source

A miniaturized photoacoustic spectroscopy-based gas sensor is proposed for the purpose of detecting sub-ppm-level carbonyl sulfide (OCS) using a tunable mid-infrared interband cascade laser (ICL) and a Helmholtz photoacoustic cell. The tuning characteristics of the tunable ICL with a center wavelength of 4823.3 nm were investigated to achieve the optimal driving parameters. A Helmholtz photoacoustic cell with a volume of ∼2.45 mL was designed and optimized to miniaturize the measurement system. By optimizing the modulation parameters and signal processing, the system was verified to have a good linear response to OCS concentration. With a lock-in amplifier integration time of 10 s, the 1σ noise standard deviation in differential mode was 0.84 mV and a minimum detection limit (MDL) of 409.2 ppbV was achieved at atmospheric pressure and room temperature.

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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.