Methods of infrared visualization of air flow

Details Methods of infrared visualization of air flow Methods of infrared visualization of air flow

1991-05-20

1992-07-07

Woodiel, Donald O.

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

7386105, G01M 900

Patent

active

051272644

ABSTRACT:
An infrared visualized air turbulence method in which helium is mixed with a heavier-than-air tracer gas such as nitrous oxide in order to cause the density of the tracer gas to be approximately equal to the density of the ambient air stream under study. To enable more accurate measurement of the velocity of the air stream, tracer gas is injected into the stream in a direction extending substantially perpendicular to the direction of flow if the stream. In one of the methods of the invention, an infrared camera and a warm background are placed on one side of an air stream and reflective surfaces are located at opposite sides of the air stream in order to enable infrared visualization of air flow in situations where it is not possible to locate the camera and the warm background on opposite sides of the air stream.

REFERENCES:
patent: 4430889 (1984-02-01), Sutton
patent: 4646564 (1987-03-01), Ide et al.
patent: 4896532 (1990-01-01), Schmalz
patent: 4925296 (1990-05-01), Riechmuth
patent: 5072612 (1991-12-01), Iverson, Jr. et al.

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