Resistive glass structures used to shape electric fields in analytical instruments

a technology of resistive glass and electric fields, applied in the field of mass spectrometers, can solve problems such as reducing electrical resistan
US20080073516A1Inactive Publication Date: 2008-03-27LAPRADE BRUCE N
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
LAPRADE BRUCE N
Publication Date
2008-03-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

A reflectron lens for a time-of-flight mass spectrometer is disclosed. The reflectron lens includes a glass tube having a conductive surface along the length of the tube. The conductive surface has an electrical resistance gradient along its length. The electrical resistance gradient provides an electric field interior to the tube that varies in strength along the length of the tube when an electric potential is applied to opposing ends of the tube. A mass spectrometer incorporating the reflectron lens, a method of making the reflectron lens, and an apparatus for removing lead from the surface of a lead silicate glass tube are also disclosed.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit if U.S. Provisional Application No. 60 / 781,088, filed Mar. 10, 2006.BACKGROUND OF THE INVENTION

[0002] This invention relates generally to mass spectrometers, and in particular to a reflectron type time-of-flight mass spectrometer and to a glass reflectron lens for such a spectrometer wherein the lens has a gradient electrical resistance on its surface.

[0003] Mass spectrometers are analytical instruments capable of identifying unknown materials in complex mixtures with precision in the parts per billion range. Once used exclusively in research laboratories, mass spectrometers are now in use in a broad range of applications. They are used in screening for pesticides in canned foods, controlling semiconductor manufacturing processes, diagnosing disease, exploring for natural resources, discovering new pharmaceuticals, predicting volcano eruptions, and security systems. Indeed, these instruments have tra...

Claims

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