CN101583867B - 检测设备 - Google Patents
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Abstract
IMS设备在其进口开口(6)的外侧具有预浓缩器(7)。分析物蒸汽在第一阶段期间被吸附,此时基本不允许任何气体进入反应区域(3)。预浓缩器(7)随后被施加电压以释放分析物分子,并在IMS外壳(1)的外侧创建一定体积的被释放的分子。接下来,压强脉冲器(8)被瞬间施加电压以降低外壳(1)中的压强,并从所述所释放的体积(9)中通过所述开口(6)小量地抽取分析物分子。这将重复直到所释放的体积(9)中的分析物分子的浓度过低而不能进行准确分析,在此之后所述设备进入另一吸附过程。
Description
技术领域
本发明涉及用于检测或分析分析物样本气体或蒸汽的检测设备,该设备具有用于允许分析物样本气体或蒸汽进入的开口。
背景技术
离子迁移率谱仪或IMS(离子迁移率谱)设备经常被用于检测诸如炸药、毒品、糜烂性和神经性药剂等物质。IMS设备一般包括检测器单元,包含可疑物质或分析物的空气样本被以气体或蒸汽的形式连续地提供到所述检测器单元。所述单元在大气压或接近大气压的条件下运行并且包含电极,对电极加上电压可以沿所述单元产生电压梯度。空气样本中的分子都已被电离(例如通过放射源、UV源或电晕放电等方式来实现),并由在一端的静电式门(gate)将其提供到所述单元中的漂移区域。电离的分子以和离子的迁移率相关的速度漂移到所述单元的另一端。通过对沿所述单元的飞行时间进行测量,能够对所述离子进行鉴别。在常规的IMS设备中,清洁干燥气流连续地通过反应和电离区域。这种配置能够实现连续采样和较短的恢复时间。当样本分析物在样本气体中只具有很小的浓度时,会存在相对较低的信噪比,这使得可靠地检测很难得以实现。
发明内容
本发明的目的是提供一种可选择的检测设备。
根据本发明的一个方面,提供了一种上述类型的检测设备,其特征在于,所述设备被配置成当不允许任何分析物气体或蒸汽进入时,在开口外侧建立一定体积的(a volume of)分析物,并经由所述开口以进发(burst)的方式每间隔一定的周期从所述体积中提供分析物到所述设备中,其中所述进发小于所述体积。
所述设备优选地包括预浓缩器,所述开口外侧的所述一定体积的分析物通过该预浓缩器建立。所述预浓缩器可以包括聚二甲基硅氧烷。所述设备优选地包括与所述设备的内部连通的压强脉冲器,所述分析物的进发通过该压强脉冲器被提供到所述设备中。所述设备可以是IMS,所述开口通向反应区域,而所述反应区域通向漂移区域。
根据本发明的另一个方面,提供了一种检测分析物样本气体或蒸汽的方法,其特征在于,所述方法包括下列步骤:建立一定体积的分析物;允许小于所建立的体积的分析物分子的进发进入到反应区域,所述进发按时间周期间隔发生,在所述时间周期期间基本不允许任何分析物分子进入;以及检测被允许进入的分析物分子的存在。
所述一定体积的分析物优选地通过吸附和释放来建立。所述分析物优选地在没有任何流量进入所述反应区域时被吸附,所述分析物随后被释放并且压强被瞬间减少以将所释放的分析物分子抽取到反应区域中。可以不断地减少压强,以便从所释放的分子中逐渐地以多次吸吮抽取分析物分子,从而耗尽所述体积中的分析物分子。分析物样本气体或蒸汽可以再次被预浓缩器所吸附,并且当所述体积中的分析物浓度被耗尽到分析已不再可靠的程度时停止压强减少,而在足够的时间之后再次重新开始释放和压强减少以释放可检测数量的分析物。
附图说明
下面将以示例的方式结合附图对根据本发明的IMS设备进行描述,该附图示出了示意性IMS设备。
具体实施方式
所述设备采用具有一般管状外壳1的离子迁移率谱仪(IMS)的形式,所述管状外壳1带有在其右手端的漂移或分析区域2,以及在其相对的左手端的反应或电离区域3。
进口管道4在一端5具有开口,与空气或其它将被采样或分析的气体或蒸汽源相连通。在另一端,管道4与泵17相连,所述样本通过泵17被抽取到所述管道,以及由毛细通道或针孔6提供的开口,该开口连通所述管道和反应区域3的内部,由此感兴趣的分子可以从所述管道被传送到所述反应区域中。所述开口可以由隔膜或其它装置来提供。进口管道4包括预浓缩器7或其它用于设置一定体积的分析物气体或蒸汽的装置,其目的将在下文中描述。
所述反应区域3包含某种用于对分析物质的分子进行电离的装置,例如高电势的电晕放电点10。反应区域3和漂移区域2都处于大气压或只是稍低于大气压。反应区域3和漂移区域2通过可选的常规静电闸板(shutter)(例如B·尼尔森门11)而彼此分离,其中所述门11对流入漂移区域的离子流进行控制。漂移区域2具有一系列的电极对12,所述电极对12分布在相对的两侧,并沿所述区域的长度方向彼此分离。电压源13对每个电极对12施加电压,所施加的电压沿漂移区域2的长度方向向右侧逐渐增加,从而经过门11的离子将经历电压梯度,该电压梯度使这些离子沿漂移区域的长度方向移动。集电极(collector)平板14安装在所述漂移区域2的远端(右手端),负责对通过所述漂移区域的离子进行收集。当离子与集电极平板14发生碰撞时,每个离子所产生的电荷都会向处理器单元15产生电信号。所述处理器单元15对所述信号进行分析,以得到所检测到的不同离子的迁移率的谱表示,并将这些结果提供给显示器或其它应用装置16。
气流系统20沿外壳1的内部产生与离子流方向相反的清洁干燥空气流。所述气流系统20包括在其进口和出口处分别具有分子筛过滤器22和23的泵21。进口过滤器22连接到进口管24,进口管24与外壳1在反应区域3的左手端(进口端)连通。出口过滤器23连接到出口管25,出口管25与外壳1在漂移区域2的右手端(下游端)连通。泵21运行,以从反应区域3中抽取气体,由此使气体在从漂移区域2的右手端流回到外壳1中之前流经第一过滤器22、泵21和第二过滤器23。
所述设备还包括压强脉冲器8,该压强脉冲器8类似于扩音器,以US6073498中描述的方式连接到外壳1。所述脉冲器8间歇地、瞬时地运行,从而将较少体积的样本蒸汽或气体抽取到反应区域3中,以产生所描述类型的压强脉冲模式。
预浓缩器7包括一定数量的材料,该材料可以吸附感兴趣的分析物蒸汽并可被配置成用于释放所述蒸汽。可以使用的典型材料包括聚二甲基硅氧烷。可在所述预浓缩器7周围配置挡板以减少由扩散所带来的样本损失。预浓缩器7位于进口针孔6附近。
在实际操作中,在吸附阶段,将被取样的空气通过泵17流入到管道4中,从而存在进出所述管道4的连续流。在该吸附阶段,分析物蒸汽被预浓缩器7所吸附,并且基本不存在到检测器外壳1中的流量。所述设备随后进入到释放阶段,在该释放阶段,泵17被关闭,由此到所述管道4的进口流被停止,以避免所收集的样本被驱散。预浓缩器7随后被加热,或通过其他方式使其将所吸附的分析物蒸汽释放到所述预浓缩器与针孔进口6之间的体积(volume)9内。同时,泵21被关闭,或者流被充分地减少,以阻止或减少沿外壳1的气流。所述压强脉冲器8随后被启动,以引起外壳1内的压强的脉冲式减少。这将带来体积9中的蒸汽的小的进发、喷出或吸吮(sip),其经由所述针孔6喷射到所述反应区域3中。每个进发中的蒸汽在反应区域3中被电离,并且离子迁移率谱由所述处理器15产生。由脉冲器8引起的每个进发的体积充分地小于预浓缩器7在体积9中所建立的蒸汽的静态体积。如此,所述脉冲器8可以在所述体积中的分析物浓度耗尽到使产生的谱变得不可靠的程度之前多次吸吮所述蒸汽静态体积。当这些发生时,检测器重新回返到吸附阶段。
通过从所建立体积的分析物蒸汽中进行多次吸吮,可获得许多谱样本,从而能够实现延长的取平均(averaging)以及信噪比的增加。这在分析物只存在于极低浓度的情况下尤其有价值。对样本所采用的小吸吮还避免使检测器超载过多的分析物质(这种情况一般发生于高数量的情况)并使得所述设备的动态范围可被延展。如果在第一次进发中检测到的蒸汽浓度很高,则所述设备可被配置成不再发生任何进发。另外,由于本发明的配置能够阻止有效电离,从而避免了在高湿度条件下出现的问题。通过采取小进发,湿度被降低到一定程度,由此它不会阻止对感兴趣的混合物进行检测。
虽然,在样本进发被抽取到反应区域中时停止由气流系统20在外壳1内产生的气流更为优选,但这不是必须的,因为可以维持所述流以冲去(flushaway)样本进发,所述样本进发使得所述样本为了进行分析而在所述反应区域内停留了足够长时间。还应注意的是,并不是必须停止沿整个外壳的气流,这是因为所述设备可以在所述反应区域内具有单独的气流路径。在这种配置下,可以停止该单独的气流,而维持沿漂移区域的剩余气流。根据另一种配置,气流可在每次进发发生时停止并在进发之间重新开始以冲去分析物质。可替换地,通过反应区域的气流可被停止一段时间,在此段时间内可发生多个进发。
还存在多种建立一定体积的样本物质的替换方法。可使用MEMS进程来建造含有吸附剂材料的小室,其中蒸汽可被吸附到所述材料上并从所述材料上被释放。除了使用加热的方式来释放所吸附的物质以外,还可使用放射、加压或震动等方式来激励释放,这些方法可单独使用或相结合使用。
本发明可被用于实现以提高的信噪比对小浓度分析物的检测。本发明在IMS设备中特别有用,但同样可应用于不同形式的检测器。
Claims (8)
1.一种用于对分析物样本气体或蒸汽进行检测或分析的检测设备,该设备具有开口(6),所述分析物样本气体或蒸汽被允许通过所述开口(6)进入,其特征在于,所述设备被配置成当不允许任何分析物气体或蒸汽进入时,在所述开口(6)外侧建立一定体积(9)的分析物,并经由所述开口以迸发的方式每间隔一定的周期从所述体积中提供分析物到所述设备(1)中,其中所述迸发小于所述体积(9),其中,所述设备是IMS,所述开口(6)通向反应区域(3),所述一定体积(9)的分析物通过吸附和释放来建立,以及所述分析物在基本没有任何流量进入所述反应区域(3)时被吸附,并且所述分析物随后被释放并且压强被瞬间减少以将所释放的分析物分子抽取到所述反应区域中。
2.根据权利要求1所述的检测设备,其特征在于,该设备包括预浓缩器(7),所述开口(6)外侧的所述一定体积(9)的分析物通过所述预浓缩器(7)建立。
3.根据权利要求2所述的检测设备,其特征在于,所述预浓缩器(7)包括聚二甲基硅氧烷。
4.根据前述权利要求中任一项权利要求所述的检测设备,其特征在于,该设备包括与所述设备(1)的内部连通的压强脉冲器(8),所述分析物的迸发通过所述压强脉冲器(8)被提供到所述设备中。
5.根据前述权利要求中任一项权利要求所述的检测设备,其特征在于,所述反应区域通向漂移区域(2)。
6.一种用于对分析物样本气体或蒸汽进行检测的方法,其特征在于,该方法包括下列步骤:建立一定体积(9)的分析物;允许小于所建立的体积(9)的分析物分子的迸发进入到反应区域(3),所述迸发按时间周期间隔发生,在所述时间周期期间基本不允许任何分析物分子进入;以及检测被允许进入的分析物分子的存在,其中,所述一定体积(9)的分析物通过吸附和释放来建立,以及所述分析物在基本没有任何流量进入所述反应区域(3)时被吸附,并且所述分析物随后被释放并且压强被瞬间减少以将所释放的分析物分子抽取到所述反应区域中。
7.根据权利要求6所述的方法,其特征在于,所述压强被不断地减少,以便从所释放的分子中逐步地以多次吸吮抽取分析物分子,从而耗尽所述体积(9)中的分析物分子。
8.根据权利要求7所述的方法,其特征在于,所述分析物样本气体或蒸汽再次被预浓缩器吸附,并且当所述体积(9)中的分析物浓度被耗尽到分析已不再可靠的程度时停止压强减少,并且在足够的时间之后再次重新开始释放和压强减少以释放可检测量的分析物。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GBGB0625478.3A GB0625478D0 (en) | 2006-12-20 | 2006-12-20 | Detection apparatus |
GB0625478.3 | 2006-12-20 | ||
PCT/GB2007/004711 WO2008074986A1 (en) | 2006-12-20 | 2007-12-10 | Detection apparatus |
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CN101583867A CN101583867A (zh) | 2009-11-18 |
CN101583867B true CN101583867B (zh) | 2013-07-03 |
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CN2007800466368A Expired - Fee Related CN101583867B (zh) | 2006-12-20 | 2007-12-10 | 检测设备 |
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US (2) | US8734722B2 (zh) |
EP (1) | EP2095101A1 (zh) |
JP (1) | JP2010513898A (zh) |
KR (1) | KR101497951B1 (zh) |
CN (1) | CN101583867B (zh) |
CA (1) | CA2672248A1 (zh) |
GB (1) | GB0625478D0 (zh) |
MX (1) | MX2009006512A (zh) |
RU (1) | RU2009122440A (zh) |
WO (1) | WO2008074986A1 (zh) |
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MX363117B (es) * | 2012-09-24 | 2019-03-08 | Smiths Detection Watford Ltd | Generador de vapor por solicitud. |
US9194805B2 (en) | 2013-08-27 | 2015-11-24 | Sandia Corporation | Trace detection of analytes using portable raman systems |
CN108956750B (zh) * | 2018-06-01 | 2021-07-27 | 清华大学深圳研究生院 | 一种工作于低气压条件的离子迁移谱装置 |
US11313833B2 (en) * | 2018-08-31 | 2022-04-26 | Leidos Security Detection & Automation, Inc. | Chemical trace detection system |
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2006
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2007
- 2007-12-10 RU RU2009122440/28A patent/RU2009122440A/ru not_active Application Discontinuation
- 2007-12-10 WO PCT/GB2007/004711 patent/WO2008074986A1/en active Application Filing
- 2007-12-10 US US12/521,542 patent/US8734722B2/en not_active Expired - Fee Related
- 2007-12-10 CN CN2007800466368A patent/CN101583867B/zh not_active Expired - Fee Related
- 2007-12-10 JP JP2009542189A patent/JP2010513898A/ja not_active Withdrawn
- 2007-12-10 KR KR1020097014987A patent/KR101497951B1/ko not_active IP Right Cessation
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JP2010513898A (ja) | 2010-04-30 |
US8734722B2 (en) | 2014-05-27 |
KR20090106529A (ko) | 2009-10-09 |
GB0625478D0 (en) | 2007-01-31 |
RU2009122440A (ru) | 2011-01-27 |
CN101583867A (zh) | 2009-11-18 |
WO2008074986A1 (en) | 2008-06-26 |
EP2095101A1 (en) | 2009-09-02 |
US9664657B2 (en) | 2017-05-30 |
US20140287522A1 (en) | 2014-09-25 |
KR101497951B1 (ko) | 2015-03-03 |
US20100317125A1 (en) | 2010-12-16 |
MX2009006512A (es) | 2009-11-05 |
CA2672248A1 (en) | 2008-06-26 |
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