中文摘要：

为了提高δ13CO2值的FTIR检测准确度,保证不同检测系统检测数据之间的兼容性,需要对测量值进行标准气体校准。首先研究了δ13CO2值的标准气体校准方法,重点研究了浓度直接校准法和δ13CO2值经验校准法的校准过程,在此基础上对δ13CO2值的FTIR测量值进行了校准修正。校准修正结果表明：校准后δ13CO2值的测量准确度有明显提高,浓度直接校准法和δ13CO2值经验校准法的准确度分别提高5.5和6.4倍。该研究有助于提高FTIR技术的检测准确度和不同系统之间检测值的兼容性。

英文摘要：

Calibration to standard reference gas scale is necessary to improve the accuracy of the measurements ,and ensure the compatibility of measurement values between different instruments for δ13CO2 value based on Fourier Transform Infrared （FTIR） spectroscopy. Firstly, the calibration methods were put forward, the absolute calibration and empirical calibration methods were studied in detail. On the basis of these researches, the δ13CO2 values were calibrated to standard reference gas scale. The calibration results show that measurements accuracy has been improved greatly, compared with measurement results of no calibration. The accuracy for absolute calibration and empirical calibration methods are improved 5.5 and 6.4 times respectively. The study is benefit to improve the accuracy of PTIR measurements and the compatibility between different instruments.