Dual laser optical system and method for studying fluid flow

Details Dual laser optical system and method for studying fluid flow Dual laser optical system and method for studying fluid flow

1981-01-12

1983-07-05

Rosenberger, R. A.

Optics: measuring and testing

Refraction testing

Schlieren effect

G01N 2141

Patent

active

043915183

ABSTRACT:
A dual laser optical system and method is disclosed for visualization of phenomena in transparent substances which induce refractive index gradients such as fluid flow and pressure and temperature gradients in fluids and gases. According to the invention two images 68 and 70 representing mutually perpendicular components of refractive index gradients may be viewed simultaneously on screen 66. Two lasers 10 and 12 having wave lengths in the visible range but separated by about 1000 angstroms are utilized to provide beams 14 and 20 which are collimated into a beam 32 containing components of the different wave lengths. The collimated beam 32 is passed through a test volume 33 of the transparent substance. The collimated beam is then separated into components of the different wave lengths and focused on to a pair of knife edges arranged mutually perpendicular to produce and project images 68 and 70 onto screen 66.

REFERENCES:
patent: 3623361 (1971-11-01), Funk
patent: 3625619 (1971-12-01), Scholdstrom
patent: 3822098 (1974-07-01), Rudder et al.
Diebold et al., "Differential Photodiode Detector for a Shock Tube Laser Schlieren System", Rev. Sci. Instrum., vol. 45, No. 6, Jun. 1974, pp. 773-775.

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