权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Practical NO Concentration Diagnostic System by Laser Induced Fluorescence

激光诱导荧光实用NO浓度诊断系统的研制

基本信息

批准号：
06650244
负责人：
YOSHIKAWA Norihiko
金额：
$ 1.28万
依托单位：
Nagoya University (1995)Toyohashi University of Technology (1994)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650244/
关键词：
Laser Induced Fluorescence Nitric Oxide Combustion Spectroscopy Pollution Substance CCD Camera

项目摘要

A planar laser induced fluorescence technique for NO gas in burner flames is established for practical use. The electronic transition is induced using the (0,0) Q_1 (18) absorption band at 225.835nm for the detection of (0,2) band fluorescence at 247.1nm. The calibration of the laser sheet intensity is obtained using 10ppm NO sample gas in nitrogen. The linear relation between the laser intensity and the LIF intensity is ascertained. The experiments for laminar and turbulent premixed methane-air flames show that the LIF signal level is high in the relatively large zones behind the flame reaction front. In laminar diffusion flames of methane and hydrogen, LIF signal is observed even in fuel zone near the burner exit. The possibilities of other signals of O_2, PAH,and fuels are rejected through a systematic check. The reason is found that the quenching effects to NO is extremely reduced in methane and hydrogen gases. Very small concentration of NO,perhaps less than ppm order, is diffused from the reaction zone into the burner exit. The LIF detection for NO_2 at 479.5nm is also tried using 439.0nm excitation laser beam. The detection in flames is not obtained. The lower detection limit of nitrogen diluted NO_2 sample gas is 2ppm.

建立了一种用于燃烧器火焰中NO气体的平面激光诱导荧光技术。利用225.835nm处的（0，0）Q_1（18）吸收带诱导电子跃迁，检测247.1nm处的（0，2）带荧光。激光片强度的校准是使用在氮气中的10 ppm NO样品气体获得的。确定了激光强度与激光诱导荧光强度之间的线性关系。对层流和湍流甲烷-空气预混火焰的实验表明，LIF信号水平在火焰反应前沿后面的相对大的区域中是高的。在甲烷和氢气的层流扩散火焰中，即使在燃烧器出口附近的燃料区也能观察到LIF信号。通过系统的检验排除了O_2、PAH和燃料等其它信号的可能性。分析发现，甲烷和氢气对NO的猝灭作用明显减弱。非常小浓度的NO（可能小于ppm数量级）从反应区扩散到燃烧器出口中。用439.0nm激发激光在479.5nm处对NO_2进行了激光诱导荧光检测。火焰中的检测未获得。用氮气稀释的NO_2样气的检测下限为2 ppm。