Ultrasonic in-situ measurement of the marine microlayer

Author

Cinbis, C. ; Despaux, G. ; Robert, L. ; Chou, C.H. ; Khuri-Yakub, B.T.

Author_Institution

Stanford Univ., CA, USA

fYear

1990

fDate

4-7 Dec 1990

Firstpage

1057

Abstract

In-situ measurement techniques for the characterization of the marine microlayer have been developed. The approach is based on integrating ultrasonic measurements with a well-accepted microlayer sampler. The sampler is a rotating glass drum that collects the thin water film covering its surface. The film thickness varies in the range of 50-200 μm for a drum rotation speed of 20 RPM. By attaching ultrasonic transducers on the inner surface of the drum, the thickness and viscosity of the film are measured. The viscosity of the liquid film over the drum is deduced from a measurement of the damping coefficient of the multiple echoes in the wall of the drum. The thickness of the film is related to the surface tension and viscosity of the liquid and to the rotation speed of the drum. Thus, the surface tension of the film is calculated

Keywords

oceanographic techniques; surface tension measurement; thickness measurement; ultrasonic applications; ultrasonic measurement; viscosity measurement; 50 to 200 micron; damping coefficient; drum rotation speed; film thickness; inner surface; liquid film; marine microlayer; microlayer sampler; multiple echoes; ocean surface; rotating glass drum; surface tension; thin water film; ultrasonic in situ measurement; ultrasonic transducers; viscosity; Glass; Laboratories; Optical surface waves; Sea measurements; Sea surface; Surface tension; Thickness measurement; Ultrasonic transducers; Ultrasonic variables measurement; Viscosity;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171524

Filename

171524