Quantitative Analysis of FTIR Spectra with Wavelet Transform

Fourier transform infrared spectroscopy has been employed in environmental gas quantitative analysis.In order to get high sensitivity and reliable results,the measured spectra should be preprocessed.In the paper,wavelet threshold filter algorithm is applied to gaseous infrared spectra analysis.The measured gas transmittance spectra are taken as processed object.Firstly,the spectra of single component are de-noised with wavelet transform.Secondly,the measured spectra of multiple-component are de-noised and analyzed.Finally,the important results such as gas concentration can be acquired.The results show that the method is good for application.