公开(公告)号：EP0867105A1

公开(公告)日：1998-09-30

申请号：EP96940951.0

申请日：1996-12-10

申请人： MDS Inc.

发明人： FRENCH, John, Barry ,  JONG, Raymond ,  ETKIN, Bernard

IPC分类号： H05H1

CPC分类号： H05H1/30 ,  H05H2001/3468 ,  H05H2001/3478

摘要： A torch for Inductively Coupled Plasma Spectrometry (ICPS) is formed from quartz and has inner and outer tubes defining an annular channel. The end of the inner tube is within an end portion of the outer tube, to define a chamber for a plasma ball. An inlet for a main gas flow opens tangentially into the annular channel. The annular channel is configured so as to maximize the swirl component of this flow. To this end, a connection to the inlet is provided with an annular toroidal shape, having a cross section to or larger than the inlet. Further, the inlet is mounted relatively close to the end of the inner tube, so as to minimise decay of the swirl component as the gas flows along the annular channel, the length of the annular channel being sufficient to ensure that the flow leaving the annular channel is uniform and has a uniform swirl component. This arrangement enables a significantly reduced consumption of gas to generate a plasma ball, and can give improved performance, in terms of a higher detection rate in a spectrometer.

公开(公告)号：EP0867105B1

公开(公告)日：2002-07-24

申请号：EP96940951.5

申请日：1996-12-10

申请人： MDS Inc.

发明人： FRENCH, John, Barry ,  JONG, Raymond ,  ETKIN, Bernard

IPC分类号： H05H1/30

CPC分类号： H05H1/30 ,  H05H2001/3468 ,  H05H2001/3478

摘要： A torch for Inductively Coupled Plasma Spectrometry (ICPS) is formed from quartz and has inner and outer tubes defining an annular channel. The end of the inner tube is within an end portion of the outer tube, to define a chamber for a plasma ball. An inlet for a main gas flow opens tangentially into the annular channel. The annular channel is configured so as to maximize the swirl component of this flow. To this end, a connection to the inlet is provided with an annular toroidal shape, having a cross section to or larger than the inlet. Further, the inlet is mounted relatively close to the end of the inner tube, so as to minimise decay of the swirl component as the gas flows along the annular channel, the length of the annular channel being sufficient to ensure that the flow leaving the annular channel is uniform and has a uniform swirl component. This arrangement enables a significantly reduced consumption of gas to generate a plasma ball, and can give improved performance, in terms of a higher detection rate in a spectrometer.

公开(公告)号：EP1012871A1

公开(公告)日：2000-06-28

申请号：EP97951050.0

申请日：1997-12-22

申请人： MDS Inc.

发明人： FRENCH, John, B. ,  ETKIN, Bernard ,  JONG, Raymond ,  LEGERE, Guy

IPC分类号： H01J49/04 ,  G01N21/73 ,  G01N30/72

CPC分类号： H01J49/049 ,  H01J49/045 ,  H01J49/105

摘要： A spray chamber for producing a sample for an analyzer which may contain a plasma torch. In the chamber, a heated sheath gas is fed into the periphery of the spray surrounding the spray, adjacent the origin of the spray, thus reducing the size of droplets which are recirculated, thereby reducing agglomeration of the droplets and promoting rapid drying of the spray. Preferably all of the spray solvent is evaporated in a very short chamber, thus further reducing the amount of spray recirculated, and all of the combined flow of dried particulates from the spray, nebulizing gas and sheath gas is directed into the torch. In one embodiment, the central core of the combined flow is directed to the torch and the peripheral portion of the combined flow is ducted to waste. In another embodiment the aqueous spray solvent is fully evaporated before it leaves the spray chamber, and the combined flow is directed through a membrane dryer before reaching the torch, to remove most of the water vapor from the flow and thus to reduce water vapor loading on the torch.