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本课题是由国家计委、经委、科委下达的国家“六五”科技攻关项目。任务是研制应用激光监测大气中污染物浓度的系统,可定站在石油化工厂,化工塑料厂等厂区附近,测定工厂排放的乙烯气在大气中的漂浮状况,也适用于大气中氨,臭氧等含量的测定。激光长程吸收测污系统利用乙烯等污染物对10μ波长红外光的共振吸收原理及差分工作方式,藉助二台光栅选线CO_2激光器产生二束激光,分别调谐在被测物的共振吸收峰线和谷线上,作为测量光束和参考光束。由于二束光对大气中存在的其他成分(主要是水汽和二氧化碳)的吸收是很接近的,因此通过差分工作
This topic is issued by the State Planning Commission, Economic Commission, Science and Technology Commission issued by the state “Six Five” scientific and technological projects. The task is to develop a system that uses laser to monitor the concentration of pollutants in the atmosphere. It can be stationed in the vicinity of petrochemical plants, chemical plastic plants and other plants to measure the floatation of ethylene gas emitted by the factory in the atmosphere. It is also applicable to atmospheric ammonia, ozone Determination of other content. Long-range laser absorption measuring system utilizes the resonance absorption principle and differential working mode of 10μ-wavelength infrared light by pollutants such as ethylene, and generates two laser beams by means of two sets of grating-selected CO_2 laser, respectively, and respectively adjusts resonance absorption peak line and Valley line, as the measuring beam and reference beam. Since the two beams are very similar to the absorption of the other components present in the atmosphere (mainly water vapor and carbon dioxide), the differential work