Method for determining fill level on the basis of travel...

Details Method for determining fill level on the basis of travel... Method for determining fill level on the basis of travel...

2006-10-13

2008-08-12

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C702S079000

Reexamination Certificate

active

07412337

ABSTRACT:
A method for determining the fill level (l) on the basis of the travel time (t) of a high-frequency measuring signal (SHF), which is transformed into a lower frequency, intermediate-frequency measuring signal (SZF), wherein the transformation factor (KT) is obtained from a difference frequency (fSweep) between a pulse repetition frequency (fPRF) and a sampling frequency (fsample) The pulse repetition frequency (fPRF) or the sampling frequency (fsample) is altered on the basis of a control with a control variable (c_var) through an appropriate control algorithm, such that a desired value (fSweep—setpoint) of the difference frequency is controlled to; wherein a gradient (grad) of at least two values is determined, and on the basis of the gradient (grad) and the difference frequency (fSweep), or difference time (tSweep), in the case of a set control variable (c_var), an operating point (OP) of the control is determined, and the control algorithm is adjusted accordingly thereto.

REFERENCES:
patent: 4221004 (1980-09-01), Combs et al.
patent: 6679115 (2004-01-01), Heidecke
patent: 298 15 069 (1999-02-01), None
patent: 101 06 681 (2003-01-01), None

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