Rapid and precise measurement of atmospheric CO2 and its isotopic ratios using a mid-infrared gas sensor

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub Date : 2025-05-01 Epub Date: 2025-01-28 DOI:10.1016/j.snb.2025.137329

Xiaojuan Cui , Xiaohan Cui , Qizhi Zhu , Shuaikang Yin , Xin Shi , Lewen Zhang , Benli Yu , Yang Hong , Weidong Chen

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Abstract

A new sensor system using tunable laser absorption spectroscopy (TLAS) technology and a quantum cascade laser (QCL) has been developed to rapidly and precisely measure atmospheric CO₂ levels and its stable isotope ratios. The sensor can detect CO₂ levels as low as 0.219 ppm within 116 ss. It achieved measurement precisions of 0.256 ‰ for δ¹³C and 0.293 ‰ for δ¹⁸O at 95 ss. This system used the weighted Kalman filtering algorithm for the first time, resulting in a 7-fold improvement in precision for δ¹³C and δ¹⁸O measurements within a 1-s integration time. This improvement is comparable to the precision obtained by the standard averaging technique after 95 ss. Multiple measurements near the laboratory showed average values of −9.19 ± 0.29 ‰ for δ¹³C and −1.46 ± 0.34 ‰ for δ¹⁸O in the atmosphere. The successful development of this gas sensor lays the foundation for its future application in atmospheric CO₂ tracing.

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使用中红外气体传感器快速、精确地测量大气中的二氧化碳及其同位素比率

利用可调谐激光吸收光谱（TLAS）技术和量子级联激光器（QCL）研制了一种新型传感器系统，用于快速、精确地测量大气CO2水平及其稳定同位素比值。该传感器可以在116秒内检测到低至0.219 ppm的二氧化碳水平。在95秒内，δ13C和δ18O的测量精度分别达到0.256‰和0.293‰。该系统首次采用加权卡尔曼滤波算法，在1 s积分时间内将δ13C和δ18O的测量精度提高了7倍。这种改进与95秒后标准平均技术获得的精度相当。在实验室附近的多次测量表明，大气中δ13C的平均值为-9.19±0.29‰，δ18O的平均值为-1.46±0.34‰。该传感器的研制成功为其在大气CO2示踪中的应用奠定了基础。

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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.