Method for measuring the level of a product in a c

专利名称：Method for measuring the level of a

product in a container following the radarprinciple

发明人：LALLA, ROBERT DR.,MUELLER, ROLAND

DIPL.-PHYS.,SINZ, MICHAEL

申请号：EP98108263.9申请日：19980506公开号：EP0955528A1公开日：19991110

专利附图：

摘要：The ratio between velocities of electromagnetic waves propagating in free

space, and the group velocity of propagation in a confinement geometry is determined.The phase difference between the significant return (echo) and a reference oscillation isdetermined. Group propagation interval is measured at differing levels (of vesselcontents). The reduction factor is determined from variations in phase difference, as afunction of the group propagation velocity. Preferred Features: The reduction factor iscalculated from the gradient of the curve displaying phase difference in terms of grouppropagation time. From each measured difference the corresponding phase propagationtime is calculated. The reduction factor is calculated from the gradient of the curveplotting difference between group propagation time and phase propagation time, as afraction of group propagation time. From each measured phase difference,

corresponding phase propagation time is calculated. The reduction factor is calculatedfrom the gradient of the curve showing the difference between group propagation timeand the square of the turning point of an approximate value of the phase propagationtime multiplied by the reduction factor, as a function of group propagation time. Themultiple ambiguity of function values in modulo 2 pi form is resolved by plausibilityanalysis.

申请人：ENDRESS + HAUSER GMBH + CO.

地址：Hauptstrasse 1 79689 Maulburg DE

国籍：DE

代理机构：Schwepfinger, Karl-Heinz, Dipl.-Ing.

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