Laser Velocimeter Seed Particle Sizing by the Whisker Particle Collector and Laser Aerosol Spectrometer Methods
Abstract
Two different aersol particle sizing systems, the whisker particle collector (WPC) and the laser aerosol spectrometer (LAS), were evaluated for sizing aerosol particles in the size range 0.1 to 3.0 mm. The evaluation tests were conducted using an aerosol of alumina (Al203) particles, an aerosol commonly used to provide light-scattering particles for laser velocimeter measurements in high-temperature flows. The measurement accuracy of the LAS was certified by comparison of its measurements to known particle sizes in test aerosols of precisely sized polystyrene latex spheres. The LAS and WPC measurements were then compared for samples taken from the alumina particle aerosols. Some difficulty was encountered in directly comparing these measurements because of the differences in the operating principles of the LAS (laser light scattering) and the WPC (particle capture/electron microscope analysis) and the consequent differences in the way the two systems account for prime particles and aggregates or agglomerates of prime particles. Other operational aspects of the two systems are also compared in this report including on-line/off-line data presentation capabilities, field portability, and measurement limitations at the small particle end of the size range of interest. Keywords: Laser velocimeter; Particle sizing; Laser aerosol spectrometer; Aerosol spectrometer; Whisker particle collector.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1989
- Accession Number
- ADA210910
Entities
People
- F. L. Crosswy
- H. J. Pfeifer
- H. J. Schafer
- M. K. Kingery
Organizations
- Arnold Engineering Development Complex