| 以干扰光谱做内部标准的乙醇激光遥测技术 |
| |
| 引用本文： | 刘鑫,杜振辉,王晓雨,袁立明,黄璐,李永建. 以干扰光谱做内部标准的乙醇激光遥测技术[J]. 红外与激光工程, 2022, 51(12): 20220275-1-20220275-7. DOI: 10.3788/IRLA20220275 |
| |
| 作者姓名： | 刘鑫 杜振辉 王晓雨 袁立明 黄璐 李永建 |
| |
| 作者单位： | 天津大学 精密仪器与光电子工程学院，天津 300072 |
| |
| 摘 要： | 乙醇是具有宽带吸收特征的大分子挥发性有机物气体，其宽带吸收受空气背景光谱的干扰，这给遥测带来了极大的困难。文中提出通过准确测量干扰光谱、用干扰光谱作为差分吸收谱内部标准的宽带谱气体分析方法，修正光谱分析系统可能的基线偏移和非线性，该方法成功应用于乙醇气体的激光遥测。针对乙醇的近红外特征吸收（7180 cm?1），在实验室条件下，以近红外DFB激光器构建了开放式的遥测实验系统，测量结果表明乙醇浓度测量误差小于3.5 ppm，由Allan方差评价结果表明在积分时间15.1 s时，检测限2.6 ppm，比目前报道的最低检测限低近2个数量级。实现了乙醇的高灵敏开放光程遥测，为进一步研制小型化的乙醇气体遥测系统奠定了基础。
|
| 关 键 词： | 激光遥测技术 乙醇气体 开放光程 宽带吸收 |
| 收稿时间： | 2022-04-15 |
Stand-off detection of ethanol by laser absorption spectrometry with interference-based internal standard |
| |
| Affiliation: | School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China |
| |
| Abstract: | Ethanol is a macromolecular volatile organic compound (VOC) with broadband absorption characteristics, which is always disturbed by the air background absorption for remote sensing. In this paper, it was proposed that a novel differential absorption spectroscopy for stand-off detection of VOCs with broadband absorption, in which accurately measured the interference spectrum and used as internal standard to correct the possible baseline offset and nonlinearity in the spectrometer. The method has been successfully applied to stand-off detection of gaseous ethanol. An open-air experimental system was constructed with a DFB diode laser under laboratory conditions for the near-infrared characteristic absorption (7180 cm?1) of ethanol. The results showed that the measurement error of ethanol concentration was less than 3.5 ppm, and the detection limit of 2.6 ppm with the integration time 15.1 s by Allan variance evaluation, which was nearly 2 orders of magnitude lower than the lowest detection limit reported at present. The proposed method laid a foundation of highly sensitive miniaturized optical system for VOCs stand-off detection. |
| |
| Keywords: | |
|
| 点击此处可从《红外与激光工程》浏览原始摘要信息 |
|
点击此处可从《红外与激光工程》下载免费的PDF全文 |
|
