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United States of America Patent
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Nov 23, 2004
Grant Date -
Dec 19, 2002
app pub date -
Aug 20, 2002
filing date -
May 8, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides apparatus and methods which facilitate movement of an instrument relative to an item or location being monitored and/or the item or location relative to the instrument, whilst successfully excluding extraneous ions from the detection location. Thus, ions generated by emissions from the item or location can successfully be monitored during movement. The technique employs sealing to exclude such ions, for instance, through an electro-field which attracts and discharges the ions prior to their entering the detecting location and/or using a magnetic field configured to repel the ions away from the detecting location.
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