CN111693498A - 一种基于飞秒激光诱导荧光测量气态氨的装置及方法 - Google Patents
一种基于飞秒激光诱导荧光测量气态氨的装置及方法 Download PDFInfo
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Abstract
本发明公开一种基于飞秒激光诱导荧光测量气态氨的装置及方法,装置包括含有氨气(NH3)的待测流场、飞秒激光器、光学参量放大器、聚焦透镜、光束截止器、成像透镜、光谱仪、ICCD相机和计算机,所述光谱仪设置于待测流场的一侧,所述光谱仪与所述ICCD相机相连,光谱仪和ICCD相机均与计算机相连,所述飞秒激光器出射的激光经所述Topas调整得到波长为305nm的激光,波长为305nm的激光依次经过聚焦透镜、待测流场和光束截止器,所述待测流场和所述光谱仪之间设有所述成像透镜。
Description
技术领域
本发明涉及飞秒激光光谱技术领域,等离子体领域和气体诊断领域,具体是基于飞秒激光诱导荧光技术实现流场中气态氨(NH3)的测量。
背景技术
实现对大气或流场中气态氨(NH3)的测量在诸多领域具有重要意义。首先,作为化工行业常用的化学品,NH3广泛应用在化肥、制冷等产业,它具有刺激性气味、有毒,若长期暴露在NH3的环境中,会对身体造成一定的伤害,在大气环境中进行NH3的检测一定程度上可以降低由于NH3泄露带来的危害[1]。其次,柴油机等燃烧设备的脱硝过程也离不开NH3。柴油机后处理装置中的尿素分解出NH3,能够有效降低尾气中的氮氧化物,但是尿素若分解过量,则会使过量的NH3排放到大气中造成二次污染,因此在这一过程中需要对NH3进行精确测量与控制[2]。第三,在燃烧领域,NH3可作为一种不含碳元素的清洁燃料,对其燃烧特性的研究与分析有助于促进相关燃烧机理的研究与燃烧模型的建立,因此实现对燃烧场中NH3的测量极为关键[3]。
目前已知的关于气态氨(NH3)的测量方法主要分为取样测量和实时测量。取样测量主要有电流检测法、荧光比率法和比色法等[4-6]。取样测量需从待测环境中提取部分气体或溶液,利用氨传感器对样品进行检测,或者是将氨传感器直接置于待测环境中进行检测。虽然取样法测量操作简便,***简单,检测极限也可低至几ppm,但取样测量破坏了待测流场的初始条件,具有干扰性,通常对NH3的存在形式(溶液)也有要求,且测量***的响应时间比较长(约20s),因此不能实现气态氨(NH3)的实时在线测量,很难将其应用到燃烧流场或封闭流场[7,8]。
基于激光的光学测量在这一方面具有较大的优势,可实现氨的实时在线测量,且对待测流场具有非干扰性,近年来在流场组分测量方面逐渐受到重视。关于气态氨(NH3)的激光诊断技术主要是基于纳秒激光(1ns=10-9s)开发的[9,10],利用纳秒激光共振激发流场中的NH3,使其发生电子能级跃迁,向外释放出荧光,通过探测荧光信号可实现NH3的测量。目前该方法已获得较高的时间空间分辨率,但仅能实现高浓度NH3的测量(800ppm),而且在燃烧场中NH3的成像质量较差。
随着激光技术的发展,飞秒激光在流场组分测量方面应用越来越广泛,相比于纳秒激光,飞秒激光的脉冲宽度低于纳秒激光5个数量级,激光峰值能量极高,可大幅提高诱导产生的荧光信号强度;而且脉冲积分能量低,解决了测量过程中的干扰问题。目前尚无相关工作基于飞秒激光诱导荧光实现流场中气态氨(NH3)的测量,本发明拟提出一种基于飞秒激光诱导荧光测量气态氨(NH3)的方法。
参考文献:
[1]胡逸.工业氨气泄漏报警***[D].哈尔滨理工大学,2016.
[2]张涛,贺蕾,张彦.燃煤锅炉烟气氨法脱硝实时监测***[J].轻工学报,2014(3):97-99.
[3]Duynslaegher C,Contino F,Vandooren J,et al.Modeling of ammoniacombustion at low pressure[J].Combustion and Flame,2012,159(9):2799-2805.
[4]Cui S,Mao S,Wen Z,et al.Controllable synthesis ofsilvernanoparticle-decorated reduced graphene oxide hybrids for ammonia detection[J].Analyst,2013,138(10):2877-2882.
[5]Duong H D,Rhee J I.A ratiometric fluorescence sensor for thedetection of ammonia in water[J].Sensors andActuators B:Chemical,2014,190:768-774.
[6]Takagai Y,Nojiri Y,Takase T,et al.“Turn-on”fluorescent polymericmicroparticle sensors for the determination of ammonia and amines in thevapor state[J].Analyst,2010,135(6):1417-1425.
[7]孙墨杰,姚杰,王冬.氨气传感器的研究[J].硅酸盐通报,2015,v.34(s1):136-139.
[8]ChengY,Feng Q,Yin M,et al.A fluorescence and colorimetric ammoniasensorbased on a Cu(II)-2,7-bis(1-imidazole)fluorene metal-organic gel[J].Tetrahedron Letters,2016,57(34):3814-3818.
[9]Brackmann C,Hole O,Zhou B,et al.Characterization of ammonia two-photon laser-induced fluorescence for gas-phase diagnostics[J].AppliedPhysics B,2014,115(1):25-33.
[10]Westblom U,Aldén M.Laser-induced fluorescence detection of NH3inflames with the use oftwo-photon excitation[J].Applied Spectroscopy,1990,44(5):881-886.
发明内容
本发明的目的是为了克服现有技术中的不足,提供一种基于飞秒激光诱导荧光测量气态氨的装置及方法,可用于实现低浓度NH3的测量。
本发明的目的是通过以下技术方案实现的:
一种基于飞秒激光诱导荧光测量气态氨的装置,包括含有氨气(NH3)的待测流场,还包括飞秒激光器、光学参量放大器(Topas)、聚焦透镜、光束截止器、成像透镜、光谱仪、ICCD相机和计算机,所述光谱仪设置于待测流场的一侧,所述光谱仪与所述ICCD相机相连,光谱仪和ICCD相机均与计算机相连,所述飞秒激光器出射的激光经所述光学参量放大器调整得到波长为305nm的激光,波长为305nm的激光依次经过聚焦透镜、待测流场和光束截止器,所述待测流场和所述光谱仪之间设有所述成像透镜。
还提供一种基于飞秒激光诱导荧光测量气态氨的方法,包括以下步骤:
飞秒激光器产生飞秒激光,飞秒激光入射到光学参量放大器中经调整产生波长为305nm的飞秒激光;
305nm的飞秒激光经反射镜反射引导至聚焦透镜处进行聚焦,调整聚焦焦点位于流场待测流场处;
待测流场中的气态氨经波长为305nm的飞秒激光诱导产生相应的荧光信号;
荧光信号经成像透镜聚集后聚焦至光谱仪的狭缝处,光谱仪对荧光信号进行分光处理后将荧光信号输送给ICCD相机;
ICCD相机将接收到的光谱信号输送给计算机进行数据处理与分析,最终实现气态氨的瞬态测量。
与现有技术相比,本发明的技术方案所带来的有益效果是:
1.本发明属于光学测量法,对待测流场无干扰,能够实现在封闭、开放流场以及在燃烧场环境中测量气态氨(NH3);
2.本发明的气态氨(NH3)的测量方法响应时间极短(约为几纳秒),能够实现流场中NH3的实时在线测量;
3.飞秒激光的脉冲宽度极短,峰值能量高,会提高多光子过程的效率,提高荧光信号的强度,降低测量NH3的极限值;
4.本发明的气态氨(NH3)的测量方法能够实现NH3燃烧场等复杂燃烧场的NH3测量;
5.本发明的气态氨(NH3)的测量方法能够实现NH3具有空间分辨的一维测量,空间分辨率约为几十微米。
附图说明
图1是本发明的结构示意图。
图2为NH3能级图
附图标记:1-飞秒激光器,2-光学参量放大器,3-聚焦透镜,4-待测流场,5-光束截止器,6-成像透镜,7-光谱仪,8-ICCD相机,9-计算机
具体实施方式
以下结合附图和具体实施例对本发明作进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
本发明主要基于飞秒激光诱导荧光技术实现流场中气态氨(NH3)的测量,如图1所示为本实施例的基于飞秒激光诱导荧光测量气态氨的装置,包括含有氨气(NH3)的待测流场4,还包括飞秒激光器1、光学参量放大器2、聚焦透镜3、光束截止器5、成像透镜6、光谱仪7、ICCD相机8和计算机9,光谱仪7设置于待测流场4的一侧,光谱仪7与ICCD相机8相连,光谱仪7和ICCD相机8均与计算机9相连,飞秒激光器1出射的激光经光学参量放大器调整得到波长为305nm的激光,波长为305nm的激光依次经过聚焦透镜3、待测流场4和光束截止器5,待测流场4和光谱仪7之间设有成像透镜6。
飞秒激光器用于产生脉冲宽度为飞秒(1fs=10-19s)级别的激光;Topas用于将来自飞秒激光器的激光调整为所需波长为305nm的飞秒激光;聚焦透镜用于聚焦飞秒激光束,使激光聚焦焦点位于流场待测流场;本实施例中待测流场为一燃烧器,用于输出含NH3的混合气体,可通过控制***调整气体流量、流速等参数;光束截止器用于收集聚焦透镜散焦后的激光光束,避免入射到人体或其他物体上造成危害;成像透镜用于聚集NH3产生的荧光信号,并将其聚焦至光谱仪狭缝处;光谱仪用于分辨待测气体中NH3的荧光光谱,本发明中NH3的荧光信号位于波长565nm处;ICCD相机用于NH3产生的荧光光谱的收集与分析;计算机用于调整光谱仪和ICCD(Intensified charge-coupled device)相机等设备的运行参数,分析光谱仪和ICCD相机等设备采集的数据。
本发明测量气态氨的装置的技术原理如下:见图2所示,NH3通过吸收2个波长为305nm的飞秒激光光子,由X能级跃迁至C’能级,NH3在C’能级由于不稳定,会自发跃迁至A能级,在由C’能级跃迁回A能级的这一过程中会向外释放出波长为565nm的荧光,通过探测荧光信号,可实现对NH3的测量。将所需波长为305nm的飞秒激光经反射镜引导和聚焦透镜聚焦后入射到待测流场,共振激发流场中的NH3,使其发生由X能级向C’能级的跃迁,处于C’能级的NH3由于不稳定会自发向A能级跃迁,在由C’能级向A能级跃迁的这一过程中会释放出波长为565nm的荧光,通过光谱仪和ICCD相机采集相应的荧光信号,可实现NH3的瞬态测量。
具体的,气态氨(NH3)的测量方法的最佳实施方式如下:
首先由飞秒激光器1产生飞秒激光,飞秒激光入射到Topas2中经调整产生所需的波长为305nm的飞秒激光,305nm的飞秒激光经两个反射镜反射引导至聚焦透镜3处,经聚焦透镜3聚焦后,调整聚焦焦点位于流场待测流场4处,待测气体中的气态氨(NH3)经波长为305nm的飞秒激光诱导产生相应的荧光信号,荧光信号经成像透镜6聚集后聚焦至光谱仪7狭缝处,光谱仪7对信号进行分光处理后将荧光信号输送给ICCD相机8,ICCD相机再将光谱信号输送给计算机9进行数据处理与分析,最终实现气态氨(NH3)的瞬态测量。
本发明并不限于上文描述的实施方式。以上对具体实施方式的描述旨在描述和说明本发明的技术方案,上述的具体实施方式仅仅是示意性的,并不是限制性的。在不脱离本发明宗旨和权利要求所保护的范围情况下,本领域的普通技术人员在本发明的启示下还可做出很多形式的具体变换,这些均属于本发明的保护范围之内。
Claims (2)
1.一种基于飞秒激光诱导荧光测量气态氨的装置,包括含有氨气(NH3)的待测流场,其特征在于,还包括飞秒激光器、光学参量放大器、聚焦透镜、光束截止器、成像透镜、光谱仪、ICCD相机和计算机,所述光谱仪设置于待测流场的一侧,所述光谱仪与所述ICCD相机相连,光谱仪和ICCD相机均与计算机相连,所述飞秒激光器出射的激光经所述光学参量放大器调整得到波长为305nm的激光,波长为305nm的激光依次经过聚焦透镜、待测流场和光束截止器,所述待测流场和所述光谱仪之间设有所述成像透镜。
2.一种基于飞秒激光诱导荧光测量气态氨的方法,基于权利要求1所述测量气态氨的装置,其特征在于,包括以下步骤:
飞秒激光器产生飞秒激光,飞秒激光入射到光学参量放大器中经调整产生波长为305nm的飞秒激光;
305nm的飞秒激光经反射镜反射引导至聚焦透镜处进行聚焦,调整聚焦焦点位于流场待测流场处;
待测流场中的气态氨经波长为305nm的飞秒激光诱导产生相应的荧光信号;
荧光信号经成像透镜聚集后聚焦至光谱仪的狭缝处,光谱仪对荧光信号进行分光处理后将荧光信号输送给ICCD相机;
ICCD相机将接收到的光谱信号输送给计算机进行数据处理与分析,最终实现气态氨的瞬态测量。
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