Author: Ajay R. ShahPublisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 64
Book Description
Development of a Laser Doppler Velocimeter Based Vertical Elutriator for Particle Sizing
Author: Ajay R. ShahPublisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 64
Book Description
Particle Sizing Experiments with the Laser Doppler Velocimeter
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Measurement techniques for in-situ simultaneous measurements of particle size distributions and particle velocities using the dual beam laser Doppler velocimeter (LV) were analytically and experimentally investigated. This investigation examined the different signal characteristics of the LV for determination of particle size and particle velocity, simultaneously. The different size related signal components were evaluated not only singularly but also as simultaneous measurements to determine which characteristic, or combination of characteristics, provided the best measure of particle size. The evaluation concentrated on the 0.5 to 5 .mu.m particle size range, in which the LV light scattering characteristics are complex often non-monotonic functions of the particle size as well as functions of index of refraction, the laser light wavelength, laser intensity and polarization, and the location and response characteristics of the detector. Different components of the LV signal were considered, but analysis concentrated on Doppler phase, visibility and scatter-intensity because they show the greatest promise. These signals characteristics were initially defined analytically for numerous optical configurations over the 0.5 to 5 .mu.m diameter range with 0.1 .mu.m segmentation, for refractive index values from 1.0 to 3.0 with absorptive (imaginary) components varied form 0 to 1.0. Collector orientation and effective f/No., as well as fringe spacing, beam polarization and wavelength, were varied in this analytical evaluation. 18 refs., 42 figs., 5 tabs.
Development Testing and Application of a Three-dimensional Laser Doppler Velocimeter for the Measurement of Gas Flows
Author: C. E. FullerInvestigation of Particle-size Determination from the Optical Response of a Laser-doppler Velocimeter
Author: Dana G. AndrewsPublisher:
ISBN:
Category : Doppler effect
Languages : en
Pages : 86
Book Description
The intensity of laser light back-scattered from a particle and transmitted by a Fabry-Perot interferometer is used to determine particle-size. The instrument's optics and electronics are calibrated by examining stationary particles of known diameter resting on a non-reflective glass slide. The response of the instrument is determined by comparing measured intensities with theoretical values calculated as a complex function of particle size, refractive index and ray geometry. The results show that the measured intensities do approximate the theoretical variation with particle size and in the range of particle diameters measured (1-10 microns), the error is less than one micron. (Author).
Laser Velocimetry and Particle Sizing
Author: Howard Doyle ThompsonPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 586
Book Description
Contents: A Historical Review of Laser Velocimetry. Developments in Instrumentation, Data Analysis, Combustion Measurements, Measurements in Turbulent Flows, Measurements in Internal Combustion Engines, General Applications, Particle Diagnostics, Wild Card Session, and Panel Discussion.
The Use of a Laser Doppler Velocimeter in Supersonic Flow
Author: William Joseph YantaPublisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 64
Book Description
Results are presented for an experimental program which investigated the application of an LDV technique in supersonic flows. This paper presents an analysis of the behavior of light-scattering particles in rapidly accelerating or shock decelerated flows, an evaluation of particle production techniques and the results of several velocity measurements. Measurements included the velocity distribution along the nozzle centerline and flow over a diamond airfoil in a Mach 3 tunnel and velocity profiles for a turbulent boundary layer in a Mach 4.8 facility. It is demonstrated that LDV measurements can be made consistently with errors of less than five percent if the particle lag is considered. (Author).
Design Considerations for a 3-D Laser Doppler Velocimeter for Studying Gravity Waves in Shallow Water
Author: Robert J. HallermeierPublisher:
ISBN:
Category : Fluid dynamic measurements
Languages : en
Pages : 8
Book Description
Investigation of Simultaneous Measurement of Particle Size and Velocity in Gas-particle Two-phase Flow Using a Laser-Doppler Velocimeter
Author: Dana Gene AndrewsPublisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 154
Book Description
Development of a Simplified Optical Technique for the Simultaneous Measurement of Particle Size Distribution and Velocity
Author: James Lee SmithPublisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 40
Book Description
Author: Luther R. Gartrell