G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/28 (2006.01) G01F 23/284 (2006.01) G01F 23/296 (2006.01) G01S 7/527 (2006.01) G01S 15/52 (2006.01)
Patent
CA 2097481
For the measurement of distance using the pulse transit time principle the received signal produced after each trans- mission of a pulse is stored as an echo profile and the effective echo is determined from the stored echo profile. In order to suppress recurrent interfering signals a stationary threshold profile adapted to the measurement environment is formed and employed for each evaluation of a stored echo profile. In order to take into account fluctuations in the properties of the received echo profile rapidly without necessitating a modification in the stationary threshold profile for this, from a stored echo profile a floating threshold profile is generated in the form of a monotonously descending curve. From the mutually corresponding values of the floating threshold profile and of the stationary threshold profile the respectively larger value is utilized for the formation of a resulting threshold profile, which is employed for each evaluation of stored echo profiles.
Elle Andre
Schmidt Hartmut
Endress U. Hauser Gmbh U. Co.
Fetherstonhaugh & Co.
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