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Method for signal processing of capacitive measurement scales

A technology of capacitance measurement and signal processing, applied in the direction of measuring devices, using electrical devices, using electromagnetic means, etc., can solve the problems of impossible filtering, small time delay, difficult measurement accuracy and high frequency update, and achieve a simple electronic structure Effect

Inactive Publication Date: 2008-10-15
HEXAGON TECH CENT GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Impossible to filter as desired due to Doppler effect affecting zero detection of composite signal
[0027] Difficult to achieve small time delays while achieving high measurement accuracy and high frequency updates

Method used

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  • Method for signal processing of capacitive measurement scales
  • Method for signal processing of capacitive measurement scales
  • Method for signal processing of capacitive measurement scales

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Embodiment Construction

[0043] The invention intends to obtain digital position information from the output signal of a known type of capacitive sensor.

[0044] Simply put, this sensor performs the following functions:

[0045] when Figure 2a When the electrode 21 in moves to the right, it will overlap with the rising degree of the electrode R, wherein the size of the overlapping area (area) is a function of the position (x) of the electrode 21, and the electrode R is in Figure 2b is shown by a continuous line R in . Thus, the capacitance between electrode 21 and the interacting electrode, in this case R, is directly proportional to the area of ​​overlap.

[0046] After this, electrode 21 will overlap successively with electrodes S, T and U in order, wherein the size of the overlapping area is Figure 2b Functions S, T and U in .

[0047] Since the sensor consists of several periods of transmitter electrodes R, S, T, and U, as indicated by dashed lines in the figure, the surface interaction li...

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Abstract

A method for the signal processing of capacitive measurement scales intended for the measurement of lengths or angles, consisting of two parts that can move relative to each other provided with electrodes that together form condensers, the magnitudes of which are variable and depend on the relative position as specified by a sinusoidal relationship (xc) between the two parts that can move relative to each other, whereby the first part has n electrodes evenly distributed over one measurement period and the second part has one electrode per measurement period, and that the electrodes in the first part are fed with n alternating voltages whereby the time displacements of the said alternating voltages relative to each other are (Fig I), where t0 is the length of the period of n the said alternating voltage, whereby the electrode of the second mobile part captures in a capacitive manner a signal that is composed of one or several of the said alternating voltages and where the amplitude composition of the composite signal depends on the relative position (x) between the two parts. All n signal contributions to the said amplitude composite are measured and stored separately for each one of the n samplings.

Description

technical field [0001] The invention introduces a method for measuring the amplitude relationship of an electrical signal consisting of several signals of the same frequency with a fixed time offset between them, but with one or several component signals having different amplitudes. Background technique [0002] The invention is mainly applicable to signal processing in capacitive measurement systems of the type introduced in Swedish patent 7714010-1 and in applications of this patent (Swedish patents 9202005-6, 8604337-9 and 0003110-4). [0003] The present invention intends to obtain a simple signal processing unit giving higher accuracy, higher resolution, faster update and lower noise level than hitherto used signal processing units. [0004] The type of capacitive measuring device to which it is expected that the invention should be applied is described in Swedish patent 7714010-1. Various applications based on Swedish patent 7714010-1 are described in Swedish patents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/241G01B7/02G01B7/30
CPCG01D5/241G01D5/2415G01D5/244G01D5/2412G01D5/2403
Inventor C-E·格斯塔埃松S·T·彼得森S·约翰森
Owner HEXAGON TECH CENT GMBH
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