Boots – shoes – and leggings
Patent
1988-10-11
1991-02-05
Lall, Parshotam S.
Boots, shoes, and leggings
73 32A, 73579, 73602, 73628, 250301, G01N 900, G06F 1552
Patent
active
049911244
ABSTRACT:
A method and system determines the density of a liquid, such as aircraft fuel, by measuring the amplitude of the reflections of ultrasonic pulses from the faces of the walls of a reference material. A transducer is used to transmit an ultrasonic interrogation pulse through a liquid to the reference material. The density of the reference material is known, and its boundaries are well defined. The interrogation pulse is reflected from the faces of the reference material boundaries to provide first, second and third return pulses that can be used to determine the density of the liquid. The density determination is accomplished by determining characteristic impedances, reflection coefficients and transmission coefficients as a function of the returned pulse amplitudes.
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W. Sachse, "Density Determination of a Fluid Inclusion in an Elastic Solid from Ultrasonic Spectroscopy Measurements", 1974 Ultrasonics Symposium Proceedings, IEEE Cat. #74 CHO 896-ISU, pp. 716-719.
Lall Parshotam S.
Lovercheck Dale R.
Mattson Brian M.
Simmonds Precision Products Inc.
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