Radiant energy – Ionic separation or analysis – With sample supply means
Reexamination Certificate
2006-01-17
2006-01-17
Wells, Nikita (Department: 2881)
Radiant energy
Ionic separation or analysis
With sample supply means
C250S286000, C250S281000, C250S282000
Reexamination Certificate
active
06987262
ABSTRACT:
Disclosed is a method and apparatus for detecting trace levels of a vapour in a carrier gas stream. A method according to the instant invention comprises the steps of providing a flow of a carrier gas through an analyzer region of a high field asymmetric waveform ion mobility spectrometer (22), the carrier gas including a first gas and a trace amount of a vapour. At least a first type of indicator ions are introduced into the analyzer region, and a compensation voltage for transmitting the at least a first type of indicator ions through the analyzer region, in the presence of the flow of a carrier gas and at a given asymmetric waveform voltage, is determined. The determined compensation voltage is compared to calibration data relating to a compensation voltage for transmitting the at least a first type of indicator ions through the analyzer region at the given asymmetric waveform voltage in the presence of each of a plurality of different known trace amounts of the vapour mixed with the first gas. In this way, an amount of the vapour in the carrier gas is determined, absent a step of ionizing a substantial portion of the vapour.
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Freedman & Associates
Ionalytics Corporation
Wells Nikita
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