Resources Contact Us Home
Measuring magnetic intensity independent of speed in a succession of moving magnetic strips

Image Number 5 for United States Patent #4380734.

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).

  Recently Added Patents
Accessory system for vehicle
Differentiated PSIP table update interval technology
Motion-compensated prediction of inter-layer residuals
Methods and systems to reduce a number of simulations in a timing analysis
Piezoelectric quasi-resonance linear motors based on acoustic standing waves with combined resonator
Power supply input voltage detection circuit
Methods of operating non-volatile memory devices during write operation interruption, non-volatile memory devices, memories and electronic systems operating the same
  Randomly Featured Patents
Transducer assembly and method for coupling ultrasonic energy to a body for thrombolysis of vascular thrombi
Process for amplifying DNA in cells
Portable telephone set combined with a card
System and method for calibrating a document assembly system having multiple asynchronously operated sections
Conveyor type oven
Apparatus for determining carbon contents in molten metal
Impedance-matching circuit using negative low-noise resistance
Disk array system including a dual-ported staging memory and concurrent redundancy calculation capability
Process for operating a fossil fuel fired power plant
Hydroxy-aluminum based drilling fluid