Accession Number:

ADA012586

Title:

Improved Flow Visualization by Use of Resonant Refractivity.

Descriptive Note:

Interim scientific rept. 1 Mar 74-28 Feb 75,

Corporate Author:

STANFORD UNIV CALIF DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s):

Report Date:

1975-05-01

Pagination or Media Count:

18.0

Abstract:

This program is concerned with exploiting the greatly increased refractivity of gases near their atomic resonant frequencies in order to obtain appreciably increased sensitivity of refractive phenomena used in flow visualization. Included are both optical-path change methods such as interferometry, as well as angular deflection methods such as schlieren and shadow techniques. During this first period, emphasis was put on analyzing dispersive behavior of candidate gases, especially sodium vapor, and on some preliminary logistics of the design of suitable experiments to verify the capability for improved flow visualization. The experimental arrangement makes use of a double-heat pipe oven and a Mach-Zehnder interferometer, together with a nitrogen-pumped tunable dye laser assembly. On the analytical side, the primary result of the work so far is a calculation of the effects of Doppler and collision broadening on the resonant dispersion curve.

Subject Categories:

  • Physical Chemistry
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE