CAJ | 학술논문

介绍了基于傅里叶变换红外技术检测CO2气体碳同位素比的新方法,详细介绍了如何从HITRAN红外数据库中提取气体标准吸收截面;介绍了基于非线性最小二乘法反演CO2气体碳同位素比和整套实验装置的组成及实验步骤.从理论和实验分析两方面讨论了温度和气压变化对δ13CO2值的影响规律.对于同一CO2标准气体,采用FTIR和同位素质谱法两种技术进行了δ13CO2值对比检测,两种测量技术的平均值差异仅为0.25%.从实验结果可以看出, FTIR技术可以实现对CO2气体碳同位素比的检测.
개소료기우부리협변환홍외기술검측CO2기체탄동위소비적신방법,상세개소료여하종HITRAN홍외수거고중제취기체표준흡수절면;개소료기우비선성최소이승법반연CO2기체탄동위소비화정투실험장치적조성급실험보취.종이론화실험분석량방면토론료온도화기압변화대δ13CO2치적영향규률.대우동일CO2표준기체,채용FTIR화동위소질보법량충기술진행료δ13CO2치대비검측,량충측량기술적평균치차이부위0.25%.종실험결과가이간출, FTIR기술가이실현대CO2기체탄동위소비적검측.
A new method to detect carbon isotope ratio of carbon dioxide is presented, which is developed based on Fourier transform infrared spectroscopy (FTIR)technique. The method to obtain the absorption coefficient from HITRAN is introduced in detail. The nonlinear least square algorithm to determineδ13CO2 value is studied. The total system and experimental procedure are shown in the paper. The temperature and pressure effect onδ13CO2 value determination are analyzed from both theory and experiment analysis. For the same CO2 standard gas, theδ13CO2 value is detected by both FTIR and IRMS technology, and the results are also comparatively analyzed and discussed. The difference in mean between both methods is only 0.25%. The experimental results show that the FTIR technique to detect carbon isotope ratio of carbon dioxide is viable.