Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Patent
1999-04-21
2000-07-11
Gregory, Bernarr E.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
342118, 342134, 342135, 342195, G01S 1308
Patent
active
060879785
ABSTRACT:
A level measuring device suitable for highly accurate measurements. A transmission pulse generator generates microwave pulses at a transmission repetition rate and transmits them through an antenna towards a material whose level is to be measured. Echo signal from the surface of the material are received by the antenna. A reference pulse generator generates reference pulses similar to the transmission pulses but at a reference repetition rate which differs from the transmission repetition rate by a small frequency difference. The echo signal and reference pulse are input to a first mixer which generates an intermediate frequency signal that, with respect to the echo signal, is slowed by a time dilation factor equal to the quotient of the transmission repetition rate and the frequency difference. A first subcircuit samples the intermediate frequency signal, the time interval between two successive samplings equaling a time unit. A differential signal generator generates a differential signal which changes with the frequency difference. A second subcircuit determines the period of the differential signal on the basis of the time unit. An evaluation unit determines an actual time interval between two points of the echo signal corresponding to the two sampling points.
REFERENCES:
patent: 4521778 (1985-06-01), Knepper
patent: 5115242 (1992-05-01), Nagamune et al.
patent: 5148177 (1992-09-01), Nagamune et al.
patent: 5182565 (1993-01-01), Nagamune et al.
Lang, Hugo and Lubcke, Wolfgang, Smart Transmitter Using Microwave Pulses to Measure the Level of Liquids and Solids in Process Application, 8131 Advances in Instrumentation and Control, ISA, 1993, Paper #93-319, pp. 731-742.
Lalla Robert
Muller Roland
Strutt Bernd
Endress & Hauser GmbH & Co.
Gregory Bernarr E.
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