Patent ID: 11874251
Assignee: JP SCIENTIFIC LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G  H

Claim 0:
1. A trapped ion mobility spectrometer comprising:
a source of flowing carrier gas; and
an analyzer, the analyzer having:
a body defining an ion channel extending therethrough, the ion channel being continuous, the ion channel having an input section at a first end of the body for receiving ions and an output section at a second end of the body for outputting ions; and
a plurality of elongate resistive conductor elements disposed at the body in the ion channel and each elongate resistive conductor element extends continuously along a substantially whole length of the ion channel, wherein each elongate resistive conductor element has a gradient of resistance along the length of the ion channel so that the resistive conductor elements are configured to generate an electric field having a gradient along the length of the ion channel when a DC signal is applied across the resistive conductor elements, wherein the electric field exerts a first force on ions within the ion channel in a direction toward the input section, wherein the resistive conductor elements are separate from the body,
a plurality of electrodes extending along the length of the ion channel and configured to generate a confining field when a time-varying electrical signal is applied to the plurality of electrodes, the confining field for confining ions along the length of the ion channel in a central portion of the ion channel,
wherein the analyzer is configured to receive, at the input section, the flowing carrier gas and to provide the flowing carrier gas to the ion channel, wherein a pressure differential is provided so that a pressure at the input section is higher than a pressure at the output section such that the flowing carrier gas exerts a second force on ions in the ion channel in a direction toward the output section.