High-sensitivity trace gas detection based on differential Helmholtz photoacoustic cell with dense spot pattern

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL

Photoacoustics Pub Date : 2024-07-09 DOI:10.1016/j.pacs.2024.100634

Chu Zhang, Ying He, Shunda Qiao, Yahui Liu, Yufei Ma

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引用次数: 0

Abstract

A high-sensitivity photoacoustic spectroscopy (PAS) sensor based on differential Helmholtz photoacoustic cell (DHPAC) with dense spot pattern is reported in this paper for the first time. A multi-pass cell based on two concave mirrors was designed to achieve a dense spot pattern, which realized 212 times excitation of incident laser. A finite element analysis was utilized to simulate the sound field distribution and frequency response of the designed DHPAC. An erbium-doped fiber amplifier (EDFA) was employed to amplify the output optical power of the laser to achieve strong excitation. In order to assess the designed sensor's performance, an acetylene (C₂H₂) detection system was established using a near infrared diode laser with a central wavelength 1530.3 nm. According to experimental results, the differential characteristics of DHPAC was verified. Compared to the sensor without dense spot pattern, the photoacoustic signal with dense spot pattern had a 44.73 times improvement. The minimum detection limit (MDL) of the designed C₂H₂-PAS sensor can be improved to 5 ppb when the average time of the sensor system is 200 s.

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基于具有密集光斑模式的差分亥姆霍兹光声电池的高灵敏度痕量气体检测技术

本文首次报道了一种基于具有密集光斑图案的差分亥姆霍兹光声电池（DHPAC）的高灵敏度光声光谱（PAS）传感器。为了实现密集光斑模式，设计了一个基于两个凹面镜的多通电池，实现了入射激光的 212 倍激发。利用有限元分析模拟了所设计的 DHPAC 的声场分布和频率响应。采用了掺铒光纤放大器（EDFA）来放大激光的输出光功率，以实现强激励。为了评估所设计传感器的性能，使用中心波长为 1530.3 nm 的近红外二极管激光器建立了乙炔（C2H2）检测系统。实验结果验证了 DHPAC 的差分特性。与不带密集光斑图案的传感器相比，带密集光斑图案的光声信号提高了 44.73 倍。当传感器系统的平均时间为 200 秒时，所设计的 C2H2-PAS 传感器的最低检测限（MDL）可提高到 5 ppb。

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.