As a monitoring technique with spectroscopy, the differential optical absorption spectroscopy technique(DOAS)uses the narrow molecular absorption bands to identify trace gases and their absorption strength to retrieve concentrations of the trace gases.

• 差分吸收光谱技术(DOAS:DifferentialOpticalAbsorptionSpectroscopy)是一种光谱监测技术,其基本原理就是利用空气中的气体分子的窄带吸收特性来鉴别气体成分,并根据窄带吸收强度来推演出微量气体的浓度。