Position measuring system
First Claim
1. A position measuring system comprising:
- a scale graduation;
a scanning element, wherein said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals;
said scanning element comprises a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes;
the scanning gap (d) between said scale graduation and said scanning element is selected in such a way that said scanning element is operated in its saturation areas of the dynamic characteristic; and
wherein said scanning element is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured.
1 Assignment
0 Petitions
Accused Products
Abstract
A position measuring system that includes a scale graduation and a scanning element, wherein the scanning element moves relative to the scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals. The scanning element includes a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes. The scanning gap (d) between the scale graduation and the scanning element is selected in such a way that as the scanning element moves over its entire measurement range a modulation between maximum input signals, which are located in the saturation areas of the dynamic characteristic, takes place. In order to eliminate the distortions of the output signals which usually occur in this modulation area it is furthermore provided to perform signal filtering in order to remove, in particular, the third harmonic from the output signal.
-
Citations
37 Claims
-
1. A position measuring system comprising:
-
a scale graduation; a scanning element, wherein said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals; said scanning element comprises a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes; the scanning gap (d) between said scale graduation and said scanning element is selected in such a way that said scanning element is operated in its saturation areas of the dynamic characteristic; and wherein said scanning element is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A position measuring system comprising:
-
a scale graduation; a scanning element, wherein said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals; an evaluation unit that receives said position-dependent, intensity modulated output signals that generates a dynamic characteristic which has respective saturation areas adjoining both sides of an at least partially approximately linear work area, in which no significantly changed output signal results, even when the input signal changes; the scanning distance between said scale graduation and said scanning element is selected in such a way that is located in its saturation areas of the dynamic characteristic; and wherein said evaluation unit is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured. - View Dependent Claims (29, 30, 31, 32, 33)
-
-
34. A position measuring system comprising:
-
a scale graduation; a scanning element, wherein said scanning element comprises a plurality of V-shaped strip-shaped magneto-resistive elements and said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals; said scanning element comprises a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes; the scanning distance (d) between said scale graduation and said scanning element is selected in such a way that as said scanning element moves over its entire measurement range a modulation between maximum input signals, which are located in the saturation areas of the dynamic characteristic, takes place; and wherein said scanning element is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured.
-
-
35. A position measuring system comprising:
-
a scale graduation; a scanning element, wherein said scanning element comprises a plurality of sine-shaped strip-shaped magneto-resistive elements and said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals; said scanning element comprises a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes; the scanning distance (d) between said scale graduation and said scanning element is selected in such a way that as said scanning element moves over its entire measurement range a modulation between maximum input signals, which are located in the saturation areas of the dynamic characteristic, takes place; and wherein said scanning element is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured.
-
-
36. A position measuring system comprising:
-
a scale graduation; a scanning element, wherein said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals; said scanning element comprises a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes; the scanning gap (d) between said scale graduation and said scanning element is selected in such a way that as said scanning element is operated in its entire measurement range a maximum output signal does not occur when compared with other possible scanning gaps when the scanning element is operated in said at least partially approximately linear operating area; and wherein said scanning element is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured.
-
-
37. A position measuring system comprising:
-
a scale graduation; a scanning element, wherein said scanning element moves relative to said scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals; an evaluation unit that receives said position-dependent, intensity modulated output signals that generates a dynamic characteristic which has respective saturation areas adjoining both sides of an at least partially approximately linear work area, in which no significantly changed output signal results, even when the input signal changes; the scanning distance between said scale graduation and said scanning element is selected in such a way that as said scanning element is operated in its entire measurement range a maximum output signal does not occur when compared with other possible scanning gaps when said scanning element is operated in said at least partially approximately linear working area; and wherein said evaluation unit is laid out in such a way, that at least filtering of the third harmonic from said output signal is assured.
-
Specification