Interferometric apparatus and method for detection and characterization of particles using light scattered therefrom
This patent describes an apparatus for the identification and characterization of particles in a sample by observing light scattered therefrom, comprising in combination: means for producing a first radiation having a first wavelength and a first polarization; means for producing a second radiation substantially collinear with the first radiation and having a second wavelength and a second polarization substantially orthogonal to the first polarization; containment means containing the sample, for allowing the first and second radiations to scatter from collisions with the particles in the sample; polarization means receiving scattered first and second radiations for resolving the scattered first and second radiations, the polarization means having an axis of transmission along which resolved scattered first and second radiations pass; photodetector means receiving and detecting the resolved scattered first and second radiations for outputting a beat frequency resulting from interaction between the resolved scattered first and second radiations, the beat frequency having a relative phase and amplitude; and measurement means receiving the beat frequency for measuring and outputting the relative phase of the beat frequency, for use in identifying and characterizing the particles.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4764013
- OSTI ID:
- 6656282
- Country of Publication:
- United States
- Language:
- English
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