Method and device for the hysteresis correction of measured values for sensors with extensometers
AssigneeSchenck Process LLC
InventorHans Guenter Koenig
Life of this patent
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Abstract
The invention relates to a method and a device for the hysteresis correction of the measured values of one or more sensors (1), which have been determined in a deformation body using extensometers. According to the invention, each measured value x affected by hysteresis is corrected for the hysteresis error. To achieve this, a hysteresis model is created from the registered strain characteristic curve and the theory of dipole density of the aligned elementary hysteresis in the interior of the deformation body. Said model is used, together with the measured values x affected by hysteresis and the recorded strain history, to derive a correction value for correcting the hysteresis error.
Claims12
Method for the hysteresis correction of measured values in connection with transducers with strain gages, which detect the strain due to a force influence on an elastic deformation body, in which the hysteresis-affected measured values are corrected by a determined hysteresis error, characterized in that a hysteresis model is formed from determined loading values in a rising and a falling loading branch, with the aid of which, and from each determined hysteresis-affected measured value x, a correction value is derivable or calculable, which serves for the correction of the hysteresis error.
Method according to one of the preceding claims, characterized in that the hysteresis-affected measured value x is determined as the output signal of a transducer (1) or as the output signal of several transducers (1) that are circuit-connected together.
Method according to one of the preceding claims, characterized in that the output signals x are formed as well from sampled analog signals or as digital values.
Apparatus for carrying out the method according to one of the preceding claims, characterized in that a transducer (1) with strain gages is provided, of which the hysteresis-affected measured values x are delivered to a 5 model circuit (3), which therefrom forms an auxiliary value h, which is coupled in a provided multiplication circuit (5) with the weighting factor w formed from a provided weighting circuit (4) to form a correction value, and from which, in a provided summing circuit (6), under consideration of the hysteresis-affected measured value x, at the output of which the corrected measured value y is available for further processing or indication.
Dependencies are inferred from the claim text.