Development And Implementation Of An Aerodynamic Holographic Interferometry System

John B. Miles; Stephen E. Dunagan; James L. Brown

doi:10.1117/12.936743

8 December 1986 Development And Implementation Of An Aerodynamic Holographic Interferometry System

John B. Miles, Stephen E. Dunagan, James L. Brown

Proceedings Volume 0693, High Speed Photography, Videography, and Photonics IV; (1986) https://doi.org/10.1117/12.936743
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

An aerodynamic holographic interferometry system has been developed and adapted for use with an existing supersonic wind tunnel. The tunnel had a 25.4 cm wide by 38.1 cm high test section, was an air-operated blow-down facility, and was run at nominal conditions of Mach number equal 2.85, total temperature of 270° K, and total pressure of 1.7 and 3.4 atmospheres. The associated fluid dynamics investigation centered on the SW/BLI problem occuring at an axisymmetric compression corner, physically created by a cylinder/cone intersection. The cylinder had a 5.08 cm diameter and was used with interchangeable conic flares of 12.5°, 20°, and 30° [each with cylinder afterbodies]. Complementary laser velocimeter measurements and Navier-Stokes computations are presented in support of the accuracy of the holographic interferometry results. The interferometry systems is illuminated by an available Q-switched ruby laser, which is expanded in the object beam to 30.48 cm diameter at the wind tunnel test section. A 5 mw He-Ne laser was used for alignment. The system features three modules: laser and reference beam, object beam expansion, and holocamera module. The design yielded excellent dynamic stability as a result of structural rigidity and placement of spatial filters far downbeam. Thermal stability also proved adequate. The system was easy to operate, and allowed for use with ambient lighting. Also, the system was necessarily operated remotely because of wind tunnel access limitations during a run. Cost figures and detailed equipment schematics are included in the paper. Additionally, the paper includes discussion of the Abel integral inversion program used to determine density profiles in the axisymmetric flow field from the recorded photographs.

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John B. Miles, Stephen E. Dunagan, and James L. Brown "Development And Implementation Of An Aerodynamic Holographic Interferometry System", Proc. SPIE 0693, High Speed Photography, Videography, and Photonics IV, (8 December 1986); https://doi.org/10.1117/12.936743

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KEYWORDS

Holographic interferometry

Holograms

Interferometry

Refractive index

Aerodynamics

High speed photography

Photonics

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