利用微型多通电池和石英音叉光电探测器在SF6气体基质中检测ppb水平H2S的光致热弹性传感器

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL

Photoacoustics Pub Date : 2023-10-01 DOI:10.1016/j.pacs.2023.100553

Bo Sun , Pietro Patimisco , Angelo Sampaolo , Andrea Zifarelli , Vincenzo Spagnolo , Hongpeng Wu , Lei Dong

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引用次数: 0

摘要

我们提出了一种基于光致热弹性光谱的光学传感器，用于检测六氟化硫（SF6）中的硫化氢（H2S）。该传感器包含一个尺寸为6厘米×4厘米×4 cm的紧凑型多通电池，并使用石英音叉（QTF）光电探测器。光功率为30mW的1.58µm近红外分布式反馈（DFB）激光器用作激发源。该传感器在300 ms的积分时间内实现了～300 ppb的最小检测极限（MDL），对应于3.96×10−9 W·cm−1·Hz−1/2的归一化噪声等效吸收系数（NNEA）。通过将积分时间延长到100 s，MDL可以减少到~25 ppb。对于70 sccm的气体流速，传感器的响应时间为~1分钟。

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Light-induced thermoelastic sensor for ppb-level H2S detection in a SF6 gas matrices exploiting a mini-multi-pass cell and quartz tuning fork photodetector

We present an optical sensor based on light-induced thermoelastic spectroscopy for the detection of hydrogen sulfide (H₂S) in sulfur hexafluoride (SF₆). The sensor incorporates a compact multi-pass cell measuring 6 cm × 4 cm × 4 cm and utilizes a quartz tuning fork (QTF) photodetector. A 1.58 µm near-infrared distributed feedback (DFB) laser with an optical power of 30 mW serves as the excitation source. The sensor achieved a minimum detection limit (MDL) of ∼300 ppb at an integration time of 300 ms, corresponding to a normalized noise equivalent absorption coefficient (NNEA) of 3.96 × 10⁻⁹ W·cm⁻¹·Hz^−1/2. By extending the integration time to 100 s, the MDL can be reduced to ∼25 ppb. The sensor exhibits a response time of ∼1 min for a gas flow rate of 70 sccm.

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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.