采用开放光路FTIR光谱法的1, 3-丁二烯测量研究

为验证利用开放光路傅里叶变换红外光谱法（OP-FTIR）测量工业区环境大气中1，3-丁二烯浓度的可行性，首先在实验室对配置的已知浓度的标准气体进行了测量研究。利用自行搭建的基于Bruker公司IR-Cube光谱仪的开放光路FTIR测量系统对不同浓度的1，3-丁二烯进行了测量，然后结合QASOFT数据库1，3-丁二烯的吸光度信息，利用非线性最小二乘拟合算法（NLLS）对测量光谱进行了浓度反演，并对测量系统作了线性标定。实验结果表明，开放光路FTIR测量系统性能稳定；系统响应快；线性度好，线性相关系数为0.998；系统对于1，3-丁二烯的检测下限约为18.77 mgm-2。实验研究表明，OP-FTIR系统能用于区域环境大气的1，3-丁二烯的监测和研究，开放光路FTIR方法能够作为1，3-丁二烯的一种分析检测技术。

Measurement and study of 1,3-butadiene based on open path FTIR spectroscopy

In order to validate the feasibility of using open path Fourier transform infrared spectroscopy (OP-FTIR) to measure 1,3-butadiene concentration of industrial area ambient gas, the standard gas with known concentration was measured in laboratory first. Different concentration 1,3-butadiene were measured by open path FTIR measurement system which was based on Bruker IR-Cube. Combined with the absorbance information of 1,3-butadiene from QASOFT database, the measured spectrum was retrieved by the nonlinear least square algorithm(NLLS), and the OP-FTIR system was calibrated with linear fitting method. Experimental results indicate that the open path FTIR measurement system has stable performance, fast response and fine linearity. The correlation coefficient is 0.998. The detection limit of 1,3-butadiene is about 18.77 mgm-2. Experimental studies have shown that the OP-FTIR system can be used to monitor and study 1,3-butadiene in ambient gas,and the open path FTIR method can be used as a technology to detect 1,3-butadiene.