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GAO Zhi HU Limin & SHEN Yiqing Institute of Mechanics Chinese Academy of Sciences Beijing China 《中国科学G辑(英文版)》2004,47(3):338-351
The gas pressure in a laser cavity of flowing chemical oxygen-iodine laser (COIL)is about 133.31333 Pa[1]. In this pressure range, effects of homogeneous and inhomo-geneous broadening competing with each other on the performances of a COIL are no-ticeable. Generally, a rate equation (RE) model is adopted to the performance modeling of a supersonic COIL, such as in refs. [1—4]. This model assumes the spectral line pro-file is homogeneously broadened. Homogeneous broadening assumption sim… 相似文献
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A chemical oxygen–iodine laser (COIL) that operates without primary buffer gas has become a new way of facilitating the compact integration of laser systems. To clarify the properties of spatial gain distribution, three-dimensional (3-D) computational fluid dynamics (CFD) technology was used to study the mixing and reactive flow in a COIL nozzle with an interleaving jet configuration in the supersonic section. The results show that the molecular iodine fraction in the secondary flow has a notable effect on the spatial distribution of the small signal gain. The rich iodine condition produces some negative gain regions along the jet trajectory, while the lean iodine condition slows down the development of the gain in the streamwise direction. It is also found that the new configuration of an interleaving jet helps form a reasonable gain field under appropriate operation conditions. 相似文献
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Deng Liezheng Shi Wenbo Wang Xiangdan Yang Heping Qu Lishen Sha Guohe 《化学物理学报(中文版)》2004,17(4):378-384
The absolute O2 (1Δ)concentration measurement performed for a singlet oxygen generator(SOG)by using the infrared radiation-calorimetry method is reported with a detailed discussion of its principle and related technique. The influence of O2 (1Δ)gas temperature variation is considered and the corresponding correction has been made,which is neglected by the previous researchers and may cause a significant error in the case of measurement for the large O2 (1Δ)flowrate. Furthermore,an automatically balanced Wheatstone bridge circuit,which is necessary for O2 (1Δ)detection on the SOG of short operation period,is designed and tested by measuring the heat capacity of oxygen. The final error analyses give out a total relative error of ±16% for the O2 (1Δ)concentration,which mainly arises from the measurements of infrared radiation,pressure and temperature at the optical cell. 相似文献
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