Patent application number | Description | Published |
20090039248 | Detection apparatus - An ion mobility spectrometer has a pair of electrodes ( | 02-12-2009 |
20090090196 | Preconcentrator and Detector Apparatus - IMS apparatus has a preconcentrator ( | 04-09-2009 |
20090206246 | Detection Apparatus and Methods - Detection apparatus including an IMS detector ( | 08-20-2009 |
20090309019 | FAIMS Apparatus Comprising Source of Dry Gas - An ion mobility spectrometer has an inlet opening into an ionization region including a conventional ionization source. A series of several charged, circular electrode plates with aligned apertures extending therethrough provides a drift region on the opposite side of the ionization region from the inlet. A gas inlet connected to a source of clean, dry flushing gas opens between the ends of the drift region, with the gas flowing against the ion flow to one side to remove water molecules from the analyte. Gas flowing in the opposite direction is effective to help drive the dry analyte ions to an analysis region provided by two parallel asymmetric field plates. | 12-17-2009 |
20100090100 | Spectrometer Apparatus - An ion mobility spectrometer has several electrodes spaced along its ion source region. Voltages are applied to the electrodes to produce a voltage gradient along the length of the ion source region. By varying the voltage gradient, the residence time of ions in the ion source region can be selectively varied. Typically, the spectrometer is arranged to reduce the residence time in response to a decrease in the amplitude, of an ion peak detected at the far end of the drift region. | 04-15-2010 |
20100308216 | FAIMS Ion Mobility Spectrometer With Multiple Doping - A FAIMS ion mobility spectrometer is arranged so that the analyte is subject to different ion chemistries at different locations along the spectrometer. Different dopants, or different concentrations of dopants or water vapor are admitted at various locations, such as at the inlet, between the inlet and the ionizer between the ionizer and the gate, between the gate and the FAIMS parallel plates, through an opening in one of the plates, or between the end of the plates and the detector. | 12-09-2010 |
20110284739 | DETECTION APPARATUS - An ion mobility spectrometer has a pair of electrodes and midway along the drift chamber. A high field is applied between the electrodes and sufficient to modify ions in the region of thee electrodes such that they move at a different rate towards the collector plate. This is used to modify the time of flight of selected ions or ion clusters and enable identification of ambiguous peaks on the IMS spectrum. | 11-24-2011 |
20120273672 | Spectrometer Apparatus - An ion mobility spectrometer has several electrodes spaced along its ion source region. Voltages are applied to the electrodes to produce a voltage gradient along the length of the ion source region. By varying the voltage gradient, the residence time of ions in the ion source region can be selectively varied. Typically, the spectrometer is arranged to reduce the residence time in response to a decrease in the amplitude, of an ion peak detected at the far end of the drift region. | 11-01-2012 |
20130056632 | Detectors And Ion Sources - A field asymmetric ion mobility spectrometer (FAIMS) has an analyte ion source assembly by which an analyte substance is ionized and supplied to the inlet of the spectrometer. The ion source assembly has an upstream source of clean, dry air and two ion sources of opposite polarity arranged at the same distance along the flow path. The ion sources are arranged so that the overall charge of the plasma produced is substantially neutral. The analyte substance is admitted via an inlet downstream of the ion sources and flows into a reaction region of enlarged cross section to slow the flow and increase the time for which the analyte molecules are exposed to the plasma. | 03-07-2013 |