NTRS - NASA Technical Reports Server

Back to Results
Rayleigh Scattering Measurements Using a Tunable Liquid Crystal Fabry-Perot InterferometerSpectroscopic Rayleigh scattering is an established flow diagnostic that has the ability to provide simultaneous density, velocity, and temperature measurements. The Fabry-Perot interferometer or etalon is a commonly employed instrument for resolving the spectrum of molecular Rayleigh scattered light for the purpose of evaluating these flow properties. This paper investigates the use of a tunable liquid crystal (LC) Fabry-Perot etalon in Rayleigh scattering experiments at NASA Glenn Research Center. The LC etalon provides a robust interferometry system that can be tuned rapidly by adjusting the voltage applied to the liquid crystal interface. Tuning the interferometer is often necessary to control the physical locations of the concentric interference fringes when Rayleigh light is imaged through the LC etalon. The LC etalon diagnostic system was tested in a 1-cm diameter nozzle flow in two different scattering configurations to evaluate its usefulness for Rayleigh measurements compared to a traditional non-tunable fused silica Fabry-Perot etalon.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Mielke-Fagan, Amy F.
(NASA Glenn Research Center Cleveland, OH, United States)
Clem, Michelle M.
(NASA Glenn Research Center Cleveland, OH, United States)
Elam, Kristie A.
(Jacobs Technology, Inc. United States)
Date Acquired
August 25, 2013
Publication Date
June 28, 2010
Subject Category
Solid-State Physics
Report/Patent Number
AIAA Paper-2010-4350
Meeting Information
Meeting: 27th AIAA Aerodynamic Measurement and Ground Testing Conference
Location: Chicago, IL
Country: United States
Start Date: June 28, 2010
End Date: July 1, 2010
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 599489.
Distribution Limits
Public Use Permitted.
No Preview Available