IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0471637
(2006-06-21)
|
등록번호 |
US-7516035
(2009-07-01)
|
우선권정보 |
EP-05105422(2005-06-21) |
발명자
/ 주소 |
- Tellenbach, Jean Maurice
- Reber, Daniel
|
출원인 / 주소 |
|
대리인 / 주소 |
Buchanan Ingersoll & Rooney PC
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
▼
A method serves to correct drift phenomena, in particular creep effects, occurring in an electronic balance that has a measuring transducer through which a measuring signal is formed which is representative of a load applied to the force-measuring device. The measuring signal is delivered by way of
A method serves to correct drift phenomena, in particular creep effects, occurring in an electronic balance that has a measuring transducer through which a measuring signal is formed which is representative of a load applied to the force-measuring device. The measuring signal is delivered by way of an analog/digital converter to a signal-processing unit that is supported by at least one processor, said signal-processing unit being capable of compensating drift deviations, for which purpose the signal-processing unit, via the processor, accesses drift parameters that are stored in a memory unit and serve as basis for calculating a time-dependent correction value by which the drift error of the measuring signal (ms) is corrected. At time intervals that are either controlled automatically or chosen by the user, new optimized values for the drift parameters are determined automatically by the processor and the signal-processing unit under the control of an optimization program that is stored in the memory unit, and the new optimized values are filed in the memory unit.
대표청구항
▼
What is claimed is: 1. A method for correction of drift phenomena in an electronic force-measuring device that includes a measuring transducer, the method comprising: receiving a measuring signal from the measuring transducer, said measuring signal representing a load applied to the force-measuring
What is claimed is: 1. A method for correction of drift phenomena in an electronic force-measuring device that includes a measuring transducer, the method comprising: receiving a measuring signal from the measuring transducer, said measuring signal representing a load applied to the force-measuring device, said measuring signal being received by a signal-processing unit that is supported by at least one processor and serves to process digital signals, and said signal-processing unit being adapted to compensate for drift deviations; calculating a time-dependent correction value by which the drift error of the measuring signal is corrected based on stored drift parameters accessed by the processor from a computer-readable memory unit, the processor and the signal-processing unit being under the control of an optimization program that is stored in the memory unit, wherein: at time intervals that are either controlled automatically or chosen by the user, new optimized values for the drift parameters are automatically determined from at least one uncorrected or only partially corrected amplitude profile that was stored previously or at the current time, from a corresponding amplitude/time value pair of the measuring signal, or from a signal profile; and said new optimized values for the drift parameters are stored in the memory unit. 2. The method according to claim 1, wherein new values for the drift parameters are determined on the basis of the current values of the drift parameters, using measurement data stored previously or at the current time, and further using test data and/or calibration data. 3. The method according to claim 1, wherein non-corrected or only partially corrected time graphs of the amplitude or amplitude/time value pairs of the measurement signal (ms), or time profiles of the measurement signal, are stored in the performance of measurements during normal operation of at least one of the force-measuring device, in test processes and in calibration processes, with or without the respective time information, whereas time profiles of the measurement signal are recorded when the load is being applied as well as when the load being removed. 4. The method according claim 3, wherein a) on the basis of the stored signal profiles the magnitude of currently occurring drift phenomena is determined and compared to a corresponding threshold value, and after the threshold value has been found to be exceeded, the method for optimizing the drift parameters is carried out; and b) the method for the correction of drift phenomena is initiated either by the user or automatically by a time control function. 5. The method according claim 3, wherein at least individual ones of the signal profiles are retrieved from the memory unit and are sequentially delivered to the signal-processing unit in which the correction of drift phenomena takes place based on new values for the drift parameters, whereupon the corrected signal profiles are evaluated and optimized values for the drift parameters are stored in memory. 6. The method according to claim 3, wherein starting from current values for the drift parameters the signal profiles are subjected to a stepwise examination and a test value is subsequently calculated for each step of the examination, optionally after determining the mean value for the measuring results, which test value corresponds to the goodness of the correction, whereupon the values for the drift parameters associated with the best test value are stored as the new current values for the drift parameters. 7. The method according to claim 2, wherein characteristic traits of the force-measuring device are determined which are the result of factors acting on the force-measuring device and/or that characteristic signal profile traits are determined from the signal profiles, based on which characteristic traits the data that are suitable for optimizing the drift parameters are selected and data that are found unsuitable are dropped from further consideration. 8. The method according to claim 6, wherein data that have been accepted by the user are further kept under consideration and/or that no further consideration is given to data: a) that include a time information associated with a time at which deviations from the normal operating mode of the force-measuring device were recorded, b) that are associated with periods when extraneous disturbances were recorded, such as mechanical vibrations, atmospheric humidity, irregularities in the line power supply, disturbances caused by air drafts that are either dependent or independent of the load or the measuring object, or temperature-related disturbances, c) for which load changes were registered that were possibly caused by release or absorption of moisture during the measurement, which may have been determined based on asymmetric drift profiles during application and removal of the load, and/or d) for which disturbances due to previous measurement applications were registered. 9. The method according to claim 2, wherein an uncorrected or only partially corrected signal profile currently recorded either for applying the load or for both application and removal of the load is confirmed either by the user or automatically by the optimization program as being acceptable for use, and that at the initiation of the user or of the optimization program, new optimized values are determined automatically based on at least the currently recorded signal profile, either for all drift parameters or only for the currently involved drift parameters. 10. The method according to claim 9, wherein the new values of the drift parameters after having been confirmed by the user are stored in the memory unit to replace the previous drift parameters. 11. The method according to claim 1, wherein over the entire operating time of the force-measuring device at least one time profile of uncompensated drift values of the force-measuring device is recorded and a time profile of compensation values associated with said non-compensated drift values is updated and used accordingly for the correction of drift phenomena. 12. A force-measuring device comprising: a measuring transducer that serves to deliver a measuring signal which is representative of a load applied to the force-measuring device; and a signal processing unit, said measuring signal being delivered via an analog/digital converter to the signal-processing unit that is supported by at least one processor, said signal-processing unit being capable of compensating drift deviations, for which purpose the processor can access drift parameters that are stored in a memory unit and serve as basis for calculating a time-dependent correction value by which the drift error of the measuring signal can be corrected, the processor being under the control of an optimization program that is stored in the memory unit to, at time intervals that are either controlled automatically or chosen by the user, automatically determine new optimized values for the drift parameters from at least one uncorrected or only partially corrected amplitude profile that was stored previously or at the current time, from a corresponding amplitude/time value pair of the measuring signal, or from a signal profile, said new optimized values for the drift parameters being stored in the memory unit. 13. The force-measuring device according to claim 12, wherein the optimization program executes a method for correction of drift phenomena in an electronic force-measuring device. 14. The force-measuring device according to claim 12, wherein the memory unit is a memory storage medium with read/write capability for storing the signal profiles. 15. The force-measuring device according to claim 12, wherein at least one calibration adjustment weight is provided, by which the force-measuring device can be calibrated and by which a signal profile can be registered based on which new drift parameters can be registered by the optimization program. 16. The force-measuring device according to claim 12, wherein means are provided for at least one of entering the condition of the force-measuring device and initializing a method for correction of drift phenomena in an electronic force-measuring device, means being provided which allow the user to confirm the acceptance of the optimized values for the drift parameters. 17. The force-measuring device according to claim 13, wherein means are provided for at least one of entering the condition of the force-measuring device and initializing a method for correction of drift phenomena in an electronic force-measuring device, means being provided which allow the user to confirm the acceptance of the optimized values for the drift parameters. 18. The force-measuring device according to claim 14, wherein means are provided for at least one of entering the condition of the force-measuring device and initializing a method for correction of drift phenomena in an electronic force-measuring device, means being provided which allow the user to confirm the acceptance of the optimized values for the drift parameters. 19. The force-measuring device according to claim 15, wherein means are provided for at least one of entering the condition of the force-measuring device and initializing a method for correction of drift phenomena in an electronic force-measuring device, means being provided which allow the user to confirm the acceptance of the optimized values for the drift parameters. 20. The method of claim 1, performed in a measuring balance. 21. A system for correction of drift phenomena in an electronic force-measuring device, comprising: a computer-readable memory storing drift parameters, signal profiles, and instructions for an optimization program; a measuring transducer configured to generate a measuring signal representing a load applied to the force-measuring device a signal processing unit including a processor, the signal-processing unit being configured to receive the measuring signal and compensate for drift deviations in the measuring signals based on the drift parameters in the computer-readable memory; wherein the instructions for the optimization program, when executed by the processor, cause the processor to perform the steps of: calculating a time-dependent correction value for a measuring signal based on the predetermined drift parameters stored in the computer-readable memory, retrieving from the computer-readable memory at least one signal profile representing an amplitude of a substantially uncorrected measurement signal recorded by the force-measuring device, determining optimized values for the drift parameters from the at least one signal profile, and storing the optimized values for the drift parameters in the computer-readable memory.
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