Abstract: A mass sensor, in an exemplary embodiment, includes a housing that includes a first plate, a second plate, and a center portion positioned between the first and second plates. The mass analyzer also includes an ionizer a double focusing mass spectrometer, and an ion detector. The ionizer, the double focusing mass spectrometer, and the ion detector are located in a cavity in the housing. The double focusing mass spectrometer includes an electric sector energy analyzer that includes a first element located on an inside surface of the first plate, and a second element located on an inside surface of the second plate. The first and second elements are substantially concentric and congruent and have a circular arc shape. Each first and second element include a first boundary electrode, a second boundary electrode, and a continuous resistive material extending between the first and second boundary electrodes.

Abstract: A mass sensor, in an exemplary embodiment, includes a housing that includes a first plate, a second plate, and a center portion positioned between the first and second plates. The mass analyzer also includes an ionizer a double focusing mass spectrometer, and an ion detector. The ionizer, the double focusing mass spectrometer, and the ion detector are located in a cavity in the housing. The double focusing mass spectrometer includes an electric sector energy analyzer that includes a first element located on an inside surface of the first plate, and a second element located on an inside surface of the second plate. The first and second elements are substantially concentric and congruent and have a circular arc shape. Each first and second element include a first boundary electrode, a second boundary electrode, and a continuous resistive material extending between the first and second boundary electrodes.

Abstract: This invention provides an apparatus or manipulator for positioning objects within a sealed chamber. The inventive positioning apparatus has a stator (or sleeve) sized and shaped for receiving a substantially cylindrical outer rotatable element. The outer element is rotatable with respect to the stator. The outer element has an eccentrically bored longitudinal passage sized and shaped for receiving an inner rotatable element. The inner and outer rotatable elements are independently rotatable with respect to each other. The object to be positioned in the sealed chamber is eccentrically mounted on the internal end face of the inner element such that relative rotation of the inner and outer element translates the mounted object in an X-Y plane perpendicular to the axis of the outer element. Relative rotation of the inner and outer elements allows two-dimensional object positioning.