Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1976-10-20
1978-11-21
Corbin, John K.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356 28, G01B 902
Patent
active
041263928
ABSTRACT:
An LDV optical system for projecting a two-color, two-axis interference fringe system and collecting backscatter radiation for two component velocity measurement. A rotor within an optical head of the system having a pair of beam splitters and a two-color filter provides two pairs of diametrically opposed split beams in orthogonal planes and with the split beams equidistant from the axis of the rotor and is angularly adjustable for setting the angular orientation of the fringe system. In a modified embodiment, a rotor with a single beam splitter providing a single pair of diametrically opposed split beams is connected to a motor to be rotated between 90.degree. limit positions for two component velocity measurement using two colors for the measurement of each component. A projection lens of a selected focal length and axially adjustable within a projection barrel provides for projecting the fringe system at a selected point, and a wave front curvature adjustment module provides for adjusting the diameter and divergence of the split beams forming the interference fringe system. An annular collector lens surrounding the barrel provides direct backscatter collection of radiation from the fringe system with the barrel isolating the collection optics from the projection optics for producing a high signal-to-noise ratio. The collected radiation is transmitted to a two-color receiver via a focusing lens, a pair of flat diagonal mirrors and an aperture located at the focal point of the focusing lens and having a diameter selected for establishing the probe volume diameter of both color channels.
REFERENCES:
patent: 3860342 (1975-01-01), Orloff et al.
patent: 3966324 (1976-06-01), Iten
Brayton et al., "A New Dual Scatter, Laser, Doppler Shift Velocity Measuring Technique", Proc. of the 16th International Aerospace Instrumentation Symposium, May 11-13, 1970.
DeSilva et al., "Observation of Thomson and Co-operative Scattering of Ruby Laser Light by a Plasma", Nature, vol. 203, pp. 1321-1322, Sep. 1964.
Corbin John K.
Koren Matthew W.
United Technologies Corporation
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