發(fā)布時間：2018-04-03 19:46

  本文選題：飛秒激光成絲　切入點：非線性特性　出處：《吉林大學》2017年碩士論文

【摘要】：飛秒激光在非線性介質中傳輸時,當克爾自聚焦和等離子散焦達到動態(tài)平衡時,就會形成等離子體細絲。在成絲過程中會發(fā)生諸多非線性效應,是研究者關注的焦點。因飛秒激光成絲時光強極高,足以將空氣分子激發(fā)到高激發(fā)態(tài),而處于高激發(fā)態(tài)的分子再次返回基態(tài)時,就會發(fā)射特征熒光,近年來,它逐漸成為科學界研究的熱點課題。本論文將飛秒激光成絲應用到燃燒科學領域,提出了一種新的燃燒診斷技術,即飛秒激光成絲誘導熒光光譜技術,這項技術能夠實現(xiàn)對多種燃燒中間產(chǎn)物的同時探測。在遙感以及提高燃料能量轉化效率等方面都具有很大的實用價值。我們對飛秒激光脈沖作用于丁烷火焰成絲時產(chǎn)生的后向散射的熒光進行了探測,發(fā)現(xiàn)多種燃燒中間產(chǎn)物CN、CH、C_2以及N_2、N_2~+在火焰中的空間分布呈現(xiàn)出極大的差異,這一差異主要取決于氣體溫度(密度)的空間分布,同時,在丁烷燃燒過程中發(fā)生的一系列反應也會對其產(chǎn)生一定的影響。飛秒激光成絲誘導熒光技術不僅可以用于探測燃燒過程中的中間產(chǎn)物,實現(xiàn)對燃燒過程的診斷,還可以對空氣中含有的可燃氣體成分進行檢測。
[Abstract]:Femtosecond laser pulses propagating in nonlinear media, when Kerr self focusing and defocusing plasma equilibrium, it will form the plasma filaments. Many nonlinear effects in the spinning process, is the focus of study. Because of strong femtosecond laser filamentation time high enough to air molecules excited to excited, and in molecular highly excited states once again return to the ground state, will emit characteristic fluorescence, in recent years, it has gradually become a hot research topic in the scientific community. This paper will be applied to femtosecond laser filamentation combustion science, put forward a new combustion diagnostic technique, namely femtosecond laser filamentation induced fluorescence spectroscopy technology, this technology can achieve detection of the intermediate products at the same time. A variety of combustion has great practical value in remote sensing and improve fuel energy conversion efficiency and so on. We make the femtosecond laser pulse For the production of butane flame during spinning of the backscattered fluorescence were detected, found a variety of combustion intermediates CN, CH, C_2 and N_2, showed a great difference in the distribution of flame space in N_2~+, this difference mainly depends on the gas temperature (density) distribution, at the same time, in a series of butane combustion the reaction occurs in the process will have some effects on the femtosecond laser filamentation induced fluorescence technique not only can be used for the detection of combustion intermediates in the process of implementation of the diagnosis of the combustion process, but also on the fuel gas composition detection can be contained in the air.

【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.21;TN249

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本文編號：1706648