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US 4,150,319 AGranted
Ion gating grid
AssigneeThe Bendix Corporation
InventorsDavid J. Nowak, James E. Rice, Donald R. Bianco
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Abstract
A grid gates a stream of ions when a D.C. potential is applied between two sets of interdigitated wires included in the grid to produce a D.C. field. The improved grid disclosed herein contains the two sets of interdigitated wires in a single plane so that the D.C. field is precisely normal to the ion current flow direction to prevent a residual ion current flow when the grid provides the gating effect.
Claims4
In an ion mobility measurement device, a grid for gating a stream of ions, comprising:
- a ring shaped frame;
- a first series of through holes disposed around the inner periphery of the ring shaped frame at first equal radial distances from the center of said ring;
- a second series of through holes concentric with the first series of holes and disposed around the inner periphery of the ring shaped frame at second equal radial distances from the center of said ring, said second radial distances being greater than said first radial distances;
- a first continuous wire strand laced through the first series of holes;
- a second continuous wire strand laced through the second series of holes;
- and
- the first and second laced wire strands providing two sets of interdigitated wires in a single plane which is precisely normal to the stream of ions when the grid is disposed in the stream.
4 more elements
Dependencies are inferred from the claim text.