Ultrasonic density measurement

Details Ultrasonic density measurement Ultrasonic density measurement

1986-07-03

1987-07-07

Levy, Stewart J.

Measuring and testing

Specific gravity or density of liquid or solid

G01N 900

Patent

active

046778420

ABSTRACT:
The density of polyethylene is determined by measuring the velocity of ultrasound through the material. The determination of density is based on the correlation between the velocity of ultrasound in semi-crystalline materials and their density, and involves the measurement of time delays of a transmitted ultrasonic pulse from each of the front surface of the material the rear surface of the material and a reflector which are immersed in a liquid. Operating within a selected frequency range provides measurements of density while eliminating viscoelastic effects.

REFERENCES:
patent: 2966057 (1960-12-01), Heller
patent: 3400363 (1968-09-01), Silverman
patent: 3995501 (1976-12-01), Wiley
patent: 4297608 (1981-10-01), Jensen
patent: 4522068 (1985-06-01), Smith
Krautkramer, Ultrasonic Testing of Materials, 1983, pp. 581-582, Springer-Verlag, Berlin, Heidelberg, N.Y.
Corsaro, Acoustic Densitometer with Results for Polyethylene Oxide, 1974, Journal of Applied Physics, vol. 45, No. 1.

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