Author: Dana Gene AndrewsPublisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 154
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
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.
Investigation 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).
Application of a Laser-doppler Technique to the Measurement of Particle Velocity in Gas-particle Two-phase Flow
Author: Stanford University. Department of Aeronautics and AstronauticsPublisher:
ISBN:
Category :
Languages : en
Pages : 362
Book Description
In chemical propulsion, the use of metallic fuel constituents burning to particulate refractory oxides in rocket engines has forced attention to the understanding of two-phase nozzle expansion processes. In this study light from a helium-neon laser was reflected both from a fixed target and from moving particles. A lens concentrated the laser light and the light back-scattered from the particles was picked up by the same lens and directed into a Fabry-Perot scanning plate interferometer. The interferometer limited observation at any moment to those particles whose Doppler shifted frequency coincided with the interferometer transmission frequency. The light from the fixed target provided a frequency reference system, and calibrated movement of the interferometer mirror spacing provided continuous examination of velocity. Data in the form of lightscattering and number count vs velocity has been obtained for water droplets in subsonic flow, for aluminum spheres and alumina abrasive in cold supersonic flow and for aluminum and magnesium oxide in hot supersonic flow. Number count-velocity data was found to be a complicated function of particle size distribution and vector velocity distribution as well as instrument characteristics.
Scientific and Technical Aerospace Reports
Author: 多相化学反应工程与工艺(上、下)(清华大学学术专著)
Author: Publisher: 清华大学出版社有限公司
ISBN: 9787302125068
Category : Fluidized reactors
Languages : en
Pages : 452
Book Description
本书介绍了流态化科学与工程方面的研究进展,与多相反应工程和工艺相关的粉体、造粒、绿色化工和生态工业等前沿领域的新内容和新进展,以及能源与环境等涉及可持续发展的战略问题。
Scientific and Technical Aerospace Reports
Author: Measurement of Velocities in Gas-liquid Two-phase Flow Using Laser Doppler Velocimetry
Author: Publisher:
ISBN:
Category : Fluid dynamic measurements
Languages : en
Pages : 40
Book Description
Development Testing and Application of a Three-dimensional Laser Doppler Velocimeter for the Measurement of Gas Flows
Author: C. E. FullerProceedings of the Dynamic Flow Conference 1978 on Dynamic Measurements in Unsteady Flows
Author: L.S.G. KovasznayPublisher: Springer Science & Business Media
ISBN: 9400995652
Category : Technology & Engineering
Languages : en
Pages : 1041
Book Description