Portable gas analyzer based on fourier transform infrared spectrometer for patrolling and examining gas Exhaust

Aimed at monitoring emission of organic gases such as ch c c iso-c n-c c c c co,and co from coal mines,petroleum refineries,and other plants,a fourier transform infrared (ft-ir) spectrometer was used to develop a portable gas analyzer for patrolling and examining gas exhaust. firstly,structure of the instrument was introduced. then,a spectral analysis approach was presented. finally,instrument was tested with standard gases and with actual gases emitted from a petroleum refinery. for the latter test,a gas chromatograph (gc) was used as a reference instrument. the test results showed that the detection limit of every component of analyte was less than 10 × 10-6. the maximum test error of every analyte was less than 15 × 10-6 when its practical concentration was no more than 500 × 10-6. a final comparison showed that the result curves of analytes obtained with ft-ir spectrometer almost overlapped with those obtained with gc,and their resulting noise was less than 6.4% when the practical gas concentration was above 100 × 10-6. as a result,our instrument was suitable to be used as a portable instrument for monitoring exhaust gases. © 2015 yuntao liang et al.