- Author
-
Herman, C.
- Title
- Advances in the Measurement of High-Speed Thermofluid Processes Using Real-Time Holographic Interferometry. BFRL Fire Research Seminar.
Seminar. VHS Video.
- Coporate
- Johns Hopkins Univ., Laurel, MD
- Report
-
BFRL Fire Research Seminar,
February 3, 1998,
- Keywords
-
interferometry
|
holography
- Abstract
- During the past decades interferometry has become a widely accepted tool in engineering measurements in the study of density, temperature and concentration fields. The combination of holography and interferometry opened new possibilities in the study of high-speed, three-dimensional processes, and more recently enhacements of the original technique have contributed to the easier quantitative evaluation and interpretation of interferometric images. In the presentation applications of real-time holographic interferometry in the study of high-speed thermofluid processes, such as self-sustained oscillatory flows in the cooling of electronic equipment as well as oscillatory heat transfer in a thermoacoustic refrigerator, are addressed. It is demonstrated that real-time holographic interferometry is suitable, apart from conventional heat transfer measurements, also for the quantitative analysis of unsteady flow fields by using temperature as tracer. A novel technique of evaluating interferometric images that yields accurate temperature measurements in the presence of pressure variations is introduced.