Patent ID: 7414708
Filing Date: 2008-08-19
Classification: G01P,G01S

Abstract:
1. A method for performing simultaneous multi-point measurements of multiple velocity components in a gas, comprising: producing Rayleigh or Mie scattered light in a plurality of directions by directing pulses of laser light to a measurement region of a gas; collecting the scattered light in a first direction along an optical axis and in an opposite, second direction along the same optical axis; collecting the scattered light in the second direction and redirecting this collected scattered light so that it travels in the first direction and through the measurement region; collecting the scattered light in a third direction along a second optical axis that is angulated with respect to the first optical axis; combining the collected scattered light from the first and second directions along the first optical axis with the collected light from the third direction along the second optical axis; combining a laser light for reference with the scattered light on any of the optical axes; directing the combined light beam containing both the reference and scattered light from multiple collecting directions toward an interferometer; generating an interferogram containing both spatial and spectral information from both reference and scattered light from multiple collecting directions; imaging and recording the interferogram by an imaging device and; processing the recorded interferogram to analyze the spectra of the combined collected scattered light in relation to the spectra of the reference laser light to determine the velocity components of the gas at multiple locations in the measurement region.