Patent ID: 6831276
Filing Date: 2004-12-14
Classification: G06Q,H01J,H04L

Abstract:
A mass sensor comprising a magnet assembly and a mass analyzer, said mass analyzer comprising:a housing having a cavity therein, said housing comprising a first plate, a second plate, and a center portion positioned between said first and second plates, said center portion comprising an outer wall; an ionizer; a double focusing mass spectrometer having superimposed orthogonal magnetic and electric fields; and an ion detector, said ionizer, said double focusing mass spectrometer, and said ion detector located in said housing cavity; said double focusing mass spectrometer comprising an electric sector energy analyzer, said electric sector energy analyzer comprising: a first element located on an inside surface of said first plate; and a second element located on an inside surface of said second plate, said first and second elements substantially concentric and congruent and having a circular arc shape, each said first and second element comprising: a first boundary electrode; a second boundary electrode; and a continuous resistive material extending between said first and second boundary electrodes.