Ion mobility spectrometer with non-radioactive ion source
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United States of America Patent
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Jul 1, 2003
Grant Date -
Dec 12, 2002
app pub date -
Apr 25, 2002
filing date -
Apr 26, 2001
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Abstract
An ion mobility spectrometer (IMS) is provided that has a non-radioactive electron source in an evacuated chamber that is separated from the reaction chamber of the IMS by an x-ray window. Electrons from the source impinge upon an x-ray anode, causing the emission of x-ray radiation toward the window. A current controller is provided by which currents in the electron-source chamber are monitored and controlled using a microprocessor circuit. If a maximum permissible residual gas pressure is exceeded, the electron source is automatically shut down and a gettering process is activated.
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