Measuring magnetic intensity independent of speed in a succession of moving magnetic strips
First Claim
1. A method of measuring magnetic intensity in each of a succession of magnetic strips in an article, comprising:
- producing relative motion between the article and a magnetic sensing head to produce a succession of first voltage waveforms, each having a shape substantially characterized by the positions of the poles in a respective strip and wherein each incremental portion of the shape has an amplitude proportional to the magnetic intensity sensed along the surface of the strip and to the instantaneous speed of the relative motion between the sensing head and such surface;
producing a second voltage waveform having a shape for each strip wherein each incremental portion has an amplitude proportional to an instantaneous speed equivalent to the speed producing the first voltage waveform for the respective strip; and
simultaneously feeding the first waveform for each strip into the numerator input and the second waveform into the denominator input of a dividing circuit having a processing speed sufficient to produce a third voltage waveform of a shape wherein each incremental portion is independent of the speed of the relative motion and is faithful in amplitude and position to the poles in the strip.
1 Assignment
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Accused Products
Abstract
The magnetic intensity in a succession of strips (12) in an article (10) is measured by producing relative motion between the article (10) and a magnetic sensing head (23) to produce a succession of first voltage waveforms. Each such waveform has a shape substantially characterized by the positions of the poles (13 and 14) in a respective strip (12). Each incremental portion of the shape has an amplitude proportional to the magnetic intensity sensed along the surface of the strip (12) and to the instantaneous speed of the relative motion between the sensing head (23) and such surface. By coupling a generator (31) to the article (10), a second voltage waveform is produced having a shape for each strip, wherein each incremental portion has an amplitude proportional to an instantaneous speed equivalent to the speed producing the first voltage waveform for the respective strip (12). The first waveform of a strip (12) is fed into the numerator input "Z" of a dividing circuit (36) and, simultaneously therewith, the second waveform for the same strip (12) is fed into the denominator input "X1" of the same circuit (36). Advantageously, the circuit (36) has a processing speed sufficient to produce a third voltage waveform of a shape wherein each incremental portion is independent of the speed of the relative motion and is faithful in amplitude and position to the poles (13 and 14) in each respective strip (12).
48 Citations
12 Claims
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1. A method of measuring magnetic intensity in each of a succession of magnetic strips in an article, comprising:
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producing relative motion between the article and a magnetic sensing head to produce a succession of first voltage waveforms, each having a shape substantially characterized by the positions of the poles in a respective strip and wherein each incremental portion of the shape has an amplitude proportional to the magnetic intensity sensed along the surface of the strip and to the instantaneous speed of the relative motion between the sensing head and such surface; producing a second voltage waveform having a shape for each strip wherein each incremental portion has an amplitude proportional to an instantaneous speed equivalent to the speed producing the first voltage waveform for the respective strip; and simultaneously feeding the first waveform for each strip into the numerator input and the second waveform into the denominator input of a dividing circuit having a processing speed sufficient to produce a third voltage waveform of a shape wherein each incremental portion is independent of the speed of the relative motion and is faithful in amplitude and position to the poles in the strip. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for measuring magnetic intensity in each of a succession of magnetic strips in an article, comprising:
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means for producing relative motion between the article and a magnetic sensing head to produce a succession of first voltage waveforms, each having a shape substantially characterized by the pole positions in a respective strip and wherein each incremental portion of the shape has an amplitude proportional to the magnetic intensity sensed along the surface of the strip and to the instantaneous speed of the relative motion between the sensing means and such surface; means for producing a second voltage waveform having a shape for each strip wherein each incremental portion has an amplitude proportional to an instantaneous speed equivalent to the speed producing the first voltage waveform for the respective strip; and means for simultaneously feeding the first waveform for each strip into the numerator input and the second waveform into the denominator input of a dividing circuit having a processing speed sufficient to produce a third voltage waveform of a shape wherein each incremental portion is independent of the speed of the relative motion and is faithful in amplitude and position to the poles in the strip. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification