CAJ | 학술논문

吸收光谱技术用于痕量气体浓度监测，特别是在气体分子稳定同位素丰度探测中，吸收谱线参数的准确性非常重要，目前普遍使用的 HITRAN数据库中给出的各项参数具有一定的不确定性。为利用2.0μm激光波段进行CO2浓度及其同位素丰度探测，需要对该波段的CO2吸收谱线参数进行校准，采用窄线宽分布反馈式二极管激光器作为光源，结合自行搭建的谱线参数测量系统，采集了2.0μm波段10条CO2吸收谱线，获得了各谱线的位置、强度、自加宽系数和N2加宽系数，并与HITRAN2012数据库中相应的数据进行对比发现两者之间吻合较好，CO2谱线强度和自加宽系数相对偏差均小于2％。实测实验室大气的CO2浓度为440 ppm ，13 CO2的丰度值δ为-9‰。测量结果为该波段应用于CO2浓度及13 CO2同位素丰度的实时在线探测提供了重要参考依据。
흡수광보기술용우흔량기체농도감측，특별시재기체분자은정동위소봉도탐측중，흡수보선삼수적준학성비상중요，목전보편사용적 HITRAN수거고중급출적각항삼수구유일정적불학정성。위이용2.0μm격광파단진행CO2농도급기동위소봉도탐측，수요대해파단적CO2흡수보선삼수진행교준，채용착선관분포반궤식이겁관격광기작위광원，결합자행탑건적보선삼수측량계통，채집료2.0μm파단10조CO2흡수보선，획득료각보선적위치、강도、자가관계수화N2가관계수，병여HITRAN2012수거고중상응적수거진행대비발현량자지간문합교호，CO2보선강도화자가관계수상대편차균소우2％。실측실험실대기적CO2농도위440 ppm ，13 CO2적봉도치δ위-9‰。측량결과위해파단응용우CO2농도급13 CO2동위소봉도적실시재선탐측제공료중요삼고의거。
The accuracy of absorption spectral parameters is very important for the trace gas measurement based on absorption spectroscopy techniques ,especially for the isotopic abundance measurement of gas molecules .For some of the applications , spectral parameters listed in HITRAN database were used to retrieve the trace gas concentration .However ,these parameters have uncertainty ,in order to validate spectroscopic parameters near 2.0 μm of CO2 lines ,which are to be used in detecting the CO2 concentration and isotopic abundance ,spectra of those lines were recorded at room temperature using a distributed feed-back (DFB) diode laser .The recorded absorption spectra were fitted to Voigt profile .Line position ,intensity ,self-broadening coeffi-cient and N2-broadening coefficient were deduced from those data .The results show a good consistency in comparison with those listed in HITRAN2012 database .The discrepancy of most line intensities and self-broadening coefficients are less than 2% .The CO2 concentration andδ(13CO2 )in real atmosphere inside laboratory are 440 ppm and -9‰ respectively .These results provide a reliable basis for real time and on line detecting the CO2 concentration and δ(13CO2 )in the wavelength range .