Application of differential optical absorption spectroscopy in ambient air monitoring

Differential optical absorption spectroscopy(DOAS) was a new developed method of ambient air monitoring.DOAS was gradually being widely used in ambient air automatic monitoring,which has many technical advantages compared with other methods.Taken the OPSIS SYSTEM 300 of Sweden as an example,the measuring principle,data processing and analysis,instrument structure and parameters,calibrate operation and daily maintenance of DOAS were introduced and summarized in this paper.