Journal ArticleDOI
Optical Frequency Shifting by Means of a Rotating Diffraction Grating
TLDR
The doppler frequency shift produced in the various diffraction orders of a rotating radial diffraction grating allows such a device to be used as an optical modulator.Abstract:
The doppler frequency shift produced in the various diffraction orders of a rotating radial diffraction grating allows such a device to be used as an optical modulator. The theory and performance of such devices is presented.read more
Citations
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Active optics: A new technology for the control of light
TL;DR: Active optical systems as mentioned in this paper are those in which real-time control over optical wavefronts is employed to optimize system perference in the presence of random distrurbances, such as interference.
Journal ArticleDOI
Laser anemometer study of flow development in curved circular pipes
Y. Agrawal,L. Talbot,K. O. Gong +2 more
TL;DR: In this paper, an experimental investigation was carried out of the development of steady, laminar, incompressible flow of a Newtonian fluid in the entry region of a curved pipe for the entry condition of uniform motion.
Journal ArticleDOI
The Benard-Von Karman instability : an experimental study near the threshold
C. Mathis,M. Provansal,L. Boyer +2 more
TL;DR: The evolution of the velocity components of the wake behind a cylinder has been investigated in the range 40 as mentioned in this paper in the presence of a cylinder in the sillage of a cylindre.
Journal ArticleDOI
Double Frequency Grating Lateral Shear Interferometer
TL;DR: A simple grating lateral shear interferometer is described that can be made to give simultaneously two interferograms having shear in two orthogonal directions to be used with real-time heterodyne phase detection.
Journal ArticleDOI
Electrophoretic light scattering
TL;DR: In this article, the authors used the Doppler principle to determine the velocities of particles of all sizes by measuring the frequency shift of the laser light which has been scattered from them.
References
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Journal ArticleDOI
LOCALIZED FLUID FLOW MEASUREMENTS WITH AN He–Ne LASER SPECTROMETER
Y. Yeh,Herman Z. Cummins +1 more
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Observation of Diffusion Broadening of Rayleigh Scattered Light
Journal ArticleDOI
Photoelectric Mixing As a Spectroscopic Tool
TL;DR: In this paper, two general receiver types are considered and termed, following rf terminology, low-level and superheterodyne receivers, which offer the possibility of simple observations of the special shape of the laser output, although good resolution will require long observation times.
Journal ArticleDOI
Measurement of Laminar Flow Development in a Square Duct Using a Laser-Doppler Flowmeter
Richard J Goldstein,D. K. Kreid +1 more
TL;DR: In this article, a system for precision measurement of fluid velocity is developed and applied to determine the laminar flow distribution in a square duct, which consists of measuring the Doppler shift of laser radiation scattered by particles moving with the fluid.
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