Dual-beam skin friction interferometer

Details Dual-beam skin friction interferometer Dual-beam skin friction interferometer

1981-07-10

1983-03-22

Corbin, John K.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

73147, G01B 902, G01B 1106

Patent

active

043773435

ABSTRACT:
A portable dual-laser-beam interferometer is described that nonintrusively measures skin friction by monitoring the thickness change of an oil film at two locations while said oil film is subjected to shear stress. An interferometer flat is utilized to develop the two beams. Light detectors sense the beam reflections from the oil film and the surface thereunder. The signals from the detectors are recorded so that the number of interference fringes produced over a given time span may be counted.

REFERENCES:
patent: 4147435 (1979-04-01), Habegger
Tanner et al., "A Study of the Motion of Oil Films on Surfaces in Air Flow . . . ", J. Phys. E: Sci. Instru., vol. 9, pp. 194-202, 1976.
Tanner, "A Skin Friction Meter, Using the Viscosity Balance Principle . . . ", J. Phys. E: Sci. Instru., vol. 10, pp. 278-284, 1977.
Tanner, "A Comparison of the Viscosity Balance and Preston Tube Methods . . . ", J. Phys. E: Sci. Instru., vol. 10, pp. 627-632, 1977.

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