Simultaneous Detection of SF6 Decomposition CO and OCS in Overlapping Absorption Bands Using a Nonlinear Inversion Algorithm

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-10-03 DOI:10.1016/j.snb.2025.138907

Yalan Luo, Lei Li, Zhechen Fan, Mingyang Feng, Pengbo Chen, Mu Liang, Yingying Qiao, Chongxin Shan

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Abstract

Photoacoustic spectroscopy (PAS) has emerged as a crucial methodology for detecting sulfur hexafluoride (SF₆) decomposition by-products in gas-insulated switchgear (GIS) equipment. This study demonstrates a highly sensitive PAS detection system for simultaneous quantification of trace carbonyl sulfide (OCS) and carbon monoxide (CO) in SF₆, featuring an interband cascade laser (ICL) emitting at 4823 nm and an H-type differential resonant photoacoustic cell designed to suppress noise. To resolve spectral cross-interference, a nonlinear inversion algorithm is developed, effectively reducing the inversion error compared with the linear superposition method. Experimental results show that the mean absolute relative errors (MAREs) for OCS and CO are 0.571% and 1.196%, with the minimum detection limits (MDLs) of 6.34 ppb and 41.09 ppb, and measurement accuracies of 99.58% and 99.5%, respectively. This work establishes a robust framework for simultaneous and anti-interference monitoring of multiple SF₆ decomposition by-products, addressing a critical need in GIS fault diagnosis.

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利用非线性反演算法同时检测SF6分解CO和OCS在重叠吸收波段

光声光谱法（PAS）已成为气体绝缘开关柜（GIS）设备中检测六氟化硫（SF₆）分解副产物的重要方法。采用4823 nm波段的带间级联激光器（ICL）和h型差分谐振光声电池，设计了一套高灵敏度的PAS检测系统，用于同时定量SF₆中痕量羰基硫醚（OCS）和一氧化碳（CO）。为了解决光谱交叉干扰，提出了一种非线性反演算法，与线性叠加法相比，有效地减小了反演误差。实验结果表明，OCS和CO的平均绝对相对误差（MAREs）分别为0.571%和1.196%，最小检出限（MDLs）分别为6.34 ppb和41.09 ppb，测量精度分别为99.58%和99.5%。本文建立了一个强大的框架，用于同时和抗干扰地监测多个顺货号分解副产物，解决了GIS故障诊断的关键需求。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.