基于单台中红外激光的 CH/CH 双气体传感系统

CH/CH dual gas sensing system using a single mid-infrared laser.

机构信息

School of Information Science and Engineering, and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, 72 Binhai Road, Qingdao 266237, China.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Apr 15;291:122368. doi: 10.1016/j.saa.2023.122368. Epub 2023 Jan 13.

DOI:10.1016/j.saa.2023.122368

PMID:36657290

Abstract

Methane (CH) and ethane (CH) dual gas sensor with low system complexity and strong stability is proposed. The correction method based on absorbance spectrum is applied, and the cross-interference of CH to CH is eliminated. In the single gas concentration measurement, linear fitting is performed between the absorbance and concentration of CH and CH, and the correlation coefficients of R = 0.99959 and R = 0.99994 are obtained respectively, which proves that the accuracy of the dual gas sensor is robust. In the dual gas concentration measurement, we carry out continuous measurement of five mixed gases and a long-term measurement of a mixture of gases, which verifies that our sensor has the fast response speed and strong stability. The minimum detectable column densities of 0.62 ppm·m for CH and 0.1 ppm·m for CH are achieved, respectively. The CH/CH dual gas sensor assisted by the correction method has high sensitivity and strong robustness to cross-interference, and has great potential for application in various scenarios.

摘要

提出了一种具有低系统复杂性和强稳定性的甲烷（CH）和乙烷（CH）双气体传感器。应用基于吸光度谱的校正方法，消除了 CH 对 CH 的交叉干扰。在单气体浓度测量中，对 CH 和 CH 的吸光度与浓度进行线性拟合，分别得到相关系数 R=0.99959 和 R=0.99994，证明了双气体传感器的准确性具有较强的鲁棒性。在双气体浓度测量中，对五种混合气体进行了连续测量，并对混合气体进行了长期测量，验证了传感器具有快速的响应速度和较强的稳定性。分别实现了对 0.62ppm·m 的 CH 和 0.1ppm·m 的 CH 的最小可检测柱密度。校正方法辅助的 CH/CH 双气体传感器具有较高的灵敏度和对交叉干扰的强鲁棒性，在各种场景下具有很大的应用潜力。