Patent ID: 6590207
Filing Date: 2003-07-08
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 and a second film resistor, said first film resistor deposited on an inside surface of said first plate and said second film resistor deposited on an inside surface of said second plate, said film resistors substantially concentric and congruent and having a circular arc shape; a first boundary electrode positioned adjacent a first curved edge of each said film resistor; and a second boundary electrode positioned adjacent a second curved edge of each said film resistor.