Radar-based method of measuring the level of a material in a ves

Details Radar-based method of measuring the level of a material in a ves Radar-based method of measuring the level of a material in a ves

1999-04-26

2000-04-25

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

Material level within container

342135, 342127, G01S 1308

Patent

active

060549467

ABSTRACT:
For measuring the level of a material in a vessel by a radar-based method an antenna arranged above the highest level anticipated radiates electromagnetic waves to the surface of the material contained in the vessel and receives reflected echo waves. The transit time of the wanted echo waves reflected by the material surface is measured from which the level is computed. Since this transit time corresponds to the group delay, for determining the reduction factor by which the group velocity of the electromagnetic waves differs from the velocity of propagation in the free space due to the geometry of the propagation space the phase difference of the wanted echo waves relative to a reference oscillation and the group delay are measured for various levels and the reduction factor is determined on the basis of the changes in the phase difference as a function of the group delay.

REFERENCES:
patent: 4503433 (1985-03-01), Tomasi
patent: 4737791 (1988-04-01), Jean et al.
patent: 4847623 (1989-07-01), Jean et al.
patent: 5115242 (1992-05-01), Nagamune et al.
patent: 5136299 (1992-08-01), Edvardsson
patent: 5656774 (1997-08-01), Nelson et al.

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