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

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub 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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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.