New York University

Ke Xiao

David G Grier

Fook Chiong Cheong

David Pine

An in-line holographic microscope can be used to analyze on a frame-by-frame basis a video stream to track individual colloidal particles' three-dimensional motions. The system and method can provide real time nanometer resolution, and simultaneously measure particle sizes and refractive indexes. Through a combination of applying a combination of Lorenz-Mie analysis with selected hardware and software methods, this analysis can be carried out in near real time. An efficient particle identification methodology automates initial position estimation with sufficient accuracy to enable unattended holographic tracking and characterization.

Automated real-time particle characterization and three-dimensional velocimetry with holographic video microscopy

A method for analyzing porosity of a particle and a medium disposed in the porosity of the particle. A video-holographic microscope is provided to analyze interference patterns produced by providing a laser source to output a collimated beam, scattering the collimated beam off a particle and interacting with an unscattered beam to generate the interference pattern for analyzation to determine the refractive index of the particle and a medium disposed in the porosity of the particle to measure porosity and the medium.

Method and system for measuring porosity of particles

A method and system for controlled fractionation of particles. A sample having a plurality of particles of different size distributions. A uniform array for the preparing of optical traps having a selected array lattice constant. The plurality of particles for inputting the plurality of particles to the uniform array of optical traps at a driving direction angle &#x398; and the plurality of particles separating along different directions &#x398;based on variable particle attributes.

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Elmhurst, NY, United States of America

Ke Xiao