Multi-pass Differential Photoacoustic Sensor for Real-Time Measurement of SF6Decomposition Component H2S at the ppb Level

化学 时滞与积分 检出限 线性 分析化学(期刊) 噪音(视频) 信号(编程语言) 堆栈(抽象数据类型) 灵敏度(控制系统) 光学 电子工程 物理 图像(数学) 色谱法 工程类 人工智能 计算机科学 程序设计语言
作者
Xinyu Zhao,Min Guo,Dongyu Cui,Chenxi Li,Hongchao Qi,Ke Chen,Fengxiang Ma,Jiayu Huang,Guangyin Zhang,Jikuan Zhao
出处
期刊:Analytical Chemistry [American Chemical Society]
卷期号:95 (21): 8214-8222 被引量:47
标识
DOI:10.1021/acs.analchem.3c00003
摘要

We designed and implemented a photoacoustic (PA) sensor for H2S detection in SF6 background gas based on a multi-pass differential photoacoustic cell (MDPC) and a near-infrared distributed feedback (DFB) laser. In the MDPC apparatus, two resonators with identical geometric parameters were vertically and symmetrically embedded. The differential processing algorithm of two phase-reversed signals realized the effective enhancement of the PA signal and suppressed the flow noise in the dynamic sampling process. In addition, the λ/4 buffer chamber in the MDPC was utilized as a muffler to further reduce the flow noise and realize the dynamic detection of H2S. The collimated excitation light was reflected 30 times in a multi-pass structure constituted of two gold-plated concave mirrors, and an absorption path length of 4.92 m was achieved. Due to the high gas density of SF6, the relationship between the signal-to-noise ratio (SNR) and the gas flow was different between SF6 and N2 background gases. The maximum flow rate of the characteristic gas components detected in the SF6 background is 150 standard cubic centimeters per minute (SCCM), which is lower than 350 SCCM in N2. The linearity property was analyzed, and the results show that the sensitivity of the sensor to H2S in the SF6 background was 27.3 μV/ppm. With the structure, parameters, temperature, gas flow, and natural frequency of the MDPC been optimized, a minimum detection limit (MDL) of 11 ppb was reached with an averaging time of 1000 s, which furnished an effective preventive implement for the safe operation of gas insulation equipment.
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