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公开(公告)号：EP1647820A2
公开(公告)日：2006-04-19
申请号：EP06000797.8
申请日：2002-09-06
申请人： TDW DELAWARE, INC.
CPC分类号： G01N21/3504 , G01J3/42 , G01J2003/423 , G01N21/031 , G01N21/39 , G01N2021/0307 , G01N2021/052 , G01N2021/399 , G01N2201/0612 , G01N2201/062
摘要： A method and device for measuring a concentration of a preselected gas in a gas sample are disclosed. The device comprises a Herriott type multiplass cell (10) having a center axle (74) and a housing (80A, 80B) surrounding and spaced from the axle t provide a tubular sample cavity (84). The gas ample is pumped through the sample cavity via apertures (154, 156) provided in opposed ends of the axle. A first mirror (44) nd a second mirror (46) are supported at opposed ends of the axle. A light source e.g a laser or LED, is provided for emitting a light beam into the sample cavity via an entry aperture (30) in the first mirror, the light beam having a wave length at which the preselected gas strongly absorbs. The beam is reflected between the mirrors for a number of times before exiting the cell via an exit aperture (48) in the second mirror and impinging on a detector (52). The device further comprises a reference detector (32) for monitoring the intensity of the unattenuated light beam and a detector for detecting the intensity of light transmitted through the second mirror after a single pass through the cell. The light source is operatively connected to a heat control assembly having a heat sink and the gas sample is passed said heat sink to augment temperature control of the light source.
摘要翻译： 公开了一种用于测量气体样品中的预选气体浓度的方法和装置。 该装置包括具有中心轴（74）和围绕轴t并与轴间隔开的壳体（80A，80B）的Herriott型多活细胞（10），提供管状样品腔（84）。 充气气体通过设置在轴的相对端中的孔（154,156）泵送通过样品腔。 第一反射镜（44）和第二反射镜（46）在轴的相对端处被支撑。 提供光源，例如激光器或LED，用于通过第一反射镜中的入射孔（30）将光束发射到样品腔中，该光束具有预选气体强烈吸收的波长。 该光束在反射镜之间反射多次，然后经由第二反射镜中的出射孔（48）离开单元并撞击到检测器（52）上。 该设备还包括用于监测未衰减光束的强度的参考检测器（32）和用于在单次通过单元之后检测透过第二反射镜的光的强度的检测器。 光源可操作地连接到具有散热器的热控制组件，并且气体样品通过所述散热器以增强光源的温度控制。
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公开(公告)号：EP1535047A1
公开(公告)日：2005-06-01
申请号：EP02778230.9
申请日：2002-09-06
申请人： TDW DELAWARE, INC.
CPC分类号： G01N21/3504 , G01J3/42 , G01J2003/423 , G01N21/031 , G01N21/39 , G01N2021/0307 , G01N2021/052 , G01N2021/399 , G01N2201/0612 , G01N2201/062
摘要： A method and device for measuring a concentration of a preselected gas in a gas sample are disclosed. The device comprises a Herriott type multipass cell (10) having a center axle (74) and a housing (80A, 80B) surrounding and spaced from the axle to provide a tubular sample cavity (84). The gas sample is pumped through the sample cavity via apertures (154, 156) provided in opposed ends of the axle. A first mirror (44) and a second mirror (46) are supported at opposed ends of the axle. A light source, e.g. a laser or LED, is provided for emitting a light beam into the sample cavity via an entry aperture (30) in the first mirror, the light beam having a wave length at which the preselected gas strongly absorbs. The beam is reflected between the mirrors for a number of times before exiting the cell via an exit aperture (48) in the second mirror and impinging on a detector (52). The device further comprises a reference detector (32) for monitoring the intensity of the unattenuated light beam and a detector for detecting the intensity of light transmitted through the second mirror after a single pass through the cell. The light source is operatively connected to a heat control assembly having a heat sink and the gas sample is passed said heat sink to augment temperature control of the light source.
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