Half-Width Integral Method for Gas Concentration Measuring in Tunable Diode Laser Absorption Spectroscopy.

We analyze the influence of random errors and absorption shape fitting errors on gas concentration measurement in tunable diode laser absorption spectroscopy. We then propose a new data processing method according to the characteristic of random errors and fitting absorption shape. This method only uses the integral value within the half width at half maximum of the fitting absorption shape to determine the gas concentration in actual measurements. Meanwhile, the O2transition at 13,150.197 cm−1is selected to measure the O2concentration using this method. Compared with the traditional method, the method established in this paper can accurately measure O2concentration. [ABSTRACT FROM AUTHOR]