Measuring and testing – Liquid level or depth gauge
Patent
1993-10-07
1995-04-18
Gutierrez, Diego F. F.
Measuring and testing
Liquid level or depth gauge
364509, 364562, 342124, 342129, 324643, 324644, G01F 2328
Patent
active
054068428
ABSTRACT:
A method and apparatus for measuring a level of a material in a tank includes providing a stepped frequency microwave signal to an antenna of a transmitter and receiving in the antenna a received signal from a surface of the material at the level to be measured. A measuring signal containing ranging and calibrating signals is processed in even and odd sample sets input to contiguous narrowband filters formed digitally in a processor using DFT and other algorithms to form true in-phase and quadrature outputs. These outputs are combined and further processed using an interpolation algorithm to isolate ranging and calibration frequency components and to accurately measure the distances represented by such components. The calibration distance associated with the calibration frequency component is compared to a known delay line length and any determined error is used to correct the ranging distance associated with the ranging frequency component.
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Gutierrez Diego F. F.
Motorola Inc.
Nehr Jeffrey D.
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