Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Patent
1996-10-08
1998-04-07
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
250288, H01J 4940, H01J 4904
Patent
active
057367396
ABSTRACT:
Generally, the present invention provides a recirculating filtration system for use with a transportable ion mobility spectrometer in gas chromatography applications. The transportable recirculating filtration system comprises a pump and a set of filters and flow sensors connected to an ion mobility spectrometry sensor having a gas chromatograph column at its inlet. The IMS sensor's outlet flow is cleaned by the filters and recirculated by the pump back into the IMS sensor as the carrier fluid stream flow. A portion of the IMS sensor's outlet flow equal to the amount of flow introduced into the sensor as the sample is exhausted from the filtration system to maintain a constant total flow volume through the system as the sample is being analyzed. Preferably, the multicapillary column is sealed to a heated transfer line leading to the sample stream inlet of the IMS sensor. The transfer line is preferably maintained at a temperature 10.degree. C.-40.degree. C. above that of the multicapillary column in order to ensure that analyte species will not adsorb on the walls of the transfer line instead of entering the sample stream inlet of the IMS sensor. The transfer line can be optionally configured with a flow smoothing insert to produce a laminar flow profile throughout the volume between the transfer line outlet end and the IMS sensor housing upon exit of the carrier flow stream from the flow smoothing insert.
REFERENCES:
patent: 4259573 (1981-03-01), Proher
patent: 4317995 (1982-03-01), Bradshaw
patent: 4633083 (1986-12-01), Knorr et al.
patent: 4732046 (1988-03-01), Lawrence
patent: 4818264 (1989-04-01), Langhorst
patent: 5032721 (1991-07-01), Bacon
patent: 5218203 (1993-06-01), Eisele et al.
patent: 5420424 (1995-05-01), Carnahan et al.
patent: 5437179 (1995-08-01), Wiegand et al.
Analytical Chemistry -vol. 65, No. 3, 1993, Columbus, US, pp. 299-306, A.P. Snyder, "Portable Hand-Held Gas Chromatography/Ion Mobility Spectrometry Device", See Figure 2.
Carnahan Byron L.
Kouznetsov Viktor
Pipich Charles W.
Tarassov Alexander
Uber Robert E.
Berman Jack I.
Mine Safety Appliances Company
LandOfFree
Recirculating filtration system for use with a transportable ion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recirculating filtration system for use with a transportable ion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recirculating filtration system for use with a transportable ion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-15282