Resources Contact Us Home
Characterization of individual particle atomic composition by aerosol mass spectrometry

Image Number 6 for United States Patent #6784423.

A method for determining the shape and size of particles and their constituent elements is disclosed. Particle ions are accelerated through a mass spectrometer useful in identifying the source particle of the resulting ions. By measuring the time-varying intensity of the identified ions as they strike a detector, a plot of the intensity of the ions over time is obtained for each ionized particle. The size of each ionized particle is determined by measuring a time span corresponding to the width of the peak of this plot. If the detector is a phosphor detector, the shape of the particle may be determined by using a high-speed camera to capture cross-section images of the ion-induced light pattern at closely-spaced successive moments in time. Alternatively, the intensity of ions striking the detector along at least one lateral dimension may be detected. By combining the multiple cross section images or the multiple lateral direction intensity profiles that are thus captured, an actual image of the shape of the original particle can be obtained.

  Recently Added Patents
Method and system for scaling usage of a social based application on an online social network
Controller for flexible and extensible flow processing in software-defined networks
Quantitative sleep analysis system and method
Anti-FGFR3 antibodies and methods using same
Generating package profiles in software package repositories using selective subsets of packages
  Randomly Featured Patents
Process for preparing a thallium-containing superconductor
Exhaust treatment system and catalyst system
Method and a device for controlling amplification of a signal emitted by a mobile terminal and increasing the autonomy of the mobile terminal
BAS reinforced in-situ with silicon nitride
Method and system for transmitting buffered data packets on a communications network
Process and circuit for initalizing a printer or copying machine
Method and apparatus for the absorption of a gas in a liquid and their use in energy conversion cycles
Camera calibration system using planar concentric circles and method thereof
Dermal anesthetic compounds and pharmaceutical compositions for inducing local anesthesia and mitigating neuropathic pain
Dispensing container for highly viscous liquids