Non-dispersive Infrared (NDIR)spectroscopic technique based on Lamber-beer law is used to detect trace gas in air.In the Lamber-beer law,approximation absorbance is linear to gas concentration.

• 针对城市痕量污染气体检测中,所测气体浓度低、吸收弱,采用两点标定和高浓度标气定标造成吸收曲线误差增大的问题,本文提出了采用低浓度标气、多点定标的方法来获得吸收曲线的方法来建立吸收方程。