Digital Photon Correlation Data Processing Techniques
Abstract
Presently available laser velocimeter (LV) electronic signal processing techniques are often inadequate for detection of light scattered by small scattering particles which are required for following the fluid motions. Example situations include low pressure and/or high velocity measurements. In other situations detection of larger scattering particles is difficult due to limited system sensitivity. Photon counting techniques offer improved system sensitivity by allowing velocity measurements to be made even when there are insufficient signal photons available to define the classical scattering signal. Such techniques are thus applicable when the presently used classical techniques are not. The objective of this contract was the theoretical and experimental development of a new type of photon-counting processor for low-level dual- scatter LV signal detection. The contract was conducted in three separately funded phases: the first was a mathematical feasibility and preliminary hardware design study for a photon-counting processor; the second was a more detailed study of the statistical nature of low-level LV signals and their effects on low-level signal processing; and the third phase was the detailed design, construction, and demonstration of a new photon counting signal processor for photon resolved laser velocimeter signals. The effort under this contract has resulted in several significant conclusions both theoretical and experimental.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1976
- Accession Number
- ADA027195
Entities
People
- W. T. Mayo Jr.