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Capacitive transimpedance amplifier with bias

A technology of amplifiers and operational amplifiers, applied in the direction of amplifiers, charge amplifiers, instruments, etc., can solve problems such as collector current pulses

Active Publication Date: 2018-04-20
SMITHS DETECTION WATFORD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionized molecules drift to the other end of the cell at a velocity dependent on the size of the ions to the collector, which causes a current pulse in the collector

Method used

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  • Capacitive transimpedance amplifier with bias
  • Capacitive transimpedance amplifier with bias
  • Capacitive transimpedance amplifier with bias

Examples

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Embodiment Construction

[0020] figure 1 is a schematic diagram of an exemplary spectrometer, such as an ion mobility spectrometer ("IMS") 100, that enables electrical ionization of molecules in a sample of interest. IMS 100 includes an elongated housing 102 extending from a first wall 104 to a second wall 106 . Defined in the housing 102 proximate to the first wall 104 is an inlet 108 . Molecules of interest may be drawn into housing 102 through inlet 108 . The housing 102 also defines an ionization chamber 110 and a drift chamber 112 in fluid communication but separated by a gate 114 that can control the passage of ions to the drift chamber. Ionization chamber 110 includes ionization source 116, which may be a radioactive source, such as a nickel 63 source, a corona discharge device, a photoionization source, or any other suitable type of source for ionizing a sample of interest. The drift chamber 112 includes electrode pairs 118 spaced apart along the drift chamber 112 to provide a potential gra...

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PUM

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Abstract

A spectrometer comprising a cumulative capacitive detector is described. An accumulating capacitive detector accumulates the ion current from the collector (768) into a changing voltage. The detector includes a collector configured to receive ions in the spectrometer, a dielectric, and a plate disposed in an overlapping configuration with the collector on opposite sides of the dielectric. The detector also includes an amplifier (764). A capacitive detector with bias (776) is described.

Description

technical field [0001] The present invention relates to detector arrangements, and more particularly to detectors for spectrometers. Background technique [0002] Ion Mobility Spectrometry ("IMS") and Field Asymmetric Ion Mobility Spectrometry ("FAIMS") or Differential Mobility Spectrometry ("DMS") devices are commonly used to detect substances such as explosives, drugs, foamers, and nerve agents. A spectrometer typically includes a detector unit in which an air sample containing a suspected substance or analyte is provided as a gas or vapor. The cells operate at or near atmospheric pressure and contain electrodes energized to create a voltage gradient across the cell. [0003] Molecules in the air sample are ionized, such as by a radioactive source, an ultraviolet ("UV") source, or by corona discharge, and are allowed to enter the drift region of the cell through an electrostatic gate at one end. The ionized molecules drift to the other end of the cell at a speed dependen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62H01J49/02
CPCG01N27/622H01J49/022H01J49/26H03F3/70H03F2200/267
Inventor J·P·菲茨杰拉德
Owner SMITHS DETECTION WATFORD LTD