Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1994-03-02
1997-03-04
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324103P, 324115, 324133, 324260, G01R 3302, G01R 3307, G01R 1302, G01R 1508
Patent
active
056083190
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method and device for measuring magnetic fields whereby a magnetically sensitive probe is introduced into a magnetic field to be measured and transmits a signal to a measuring device for evaluation.
2. Description of the Prior Art
The technique for measuring magnetic fields using Hall probes is known from the literature. For example, the firm of List-Magnetik GmbH, D-7022 Leinfelden-Echterdingen offers such a portable magnetic field measuring device under the name of MP-U. This device is suitable for measuring time-constant fields in both directions of polarity (north and south pole), and selectively also for measuring alternating fields. As operating elements, the device has respectively one selection switch for the type of display (constant or alternating field, as well as peak value memory) and the measuring range, a key for resetting the peak value indication and a rotating knob for setting the zero point.
A similar device is offered by the firm of Walker Scientific Inc., Worcester, Mass., USA, under the model designation MG-5DP. This device also has essentially the same operating elements: a function selector, a measuring range selector, a peak value reset key and a zero point setting knob. As with the first mentioned device, a digital display is disposed at the front face of the measuring device. The magnetic field probe is connected to the device by a cable.
In actual, use these measuring devices are uncomfortable to handle and complicated to operate. Often the setting of the zero point is omitted when activating the device. This causes continuously faulty readings if subsequently the zero point setting is inadvertently changed.
The selection of the measuring range requires an intervention at the measuring device which distracts from the actual measuring task. Areas having different field strengths are again and again contacted, especially in the course of diagnosing magnetic fields, which always requires a correction of the measuring range. For peak value measurement, the magnitude of the value must be known in order to use the indicator.
The measurement of magnetic fields requires the continuous correlation of the probe position and the measured value. This, in turn requires alternating observation of the probe and the display.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a method for measuring magnetic requiring considerably fewer manual interventions than know methods, and automating the measurement steps as much as possible.
It is another object of this invention to provide a measuring device which simplifies the operation of the method and requires only a minimum of interventions.
It is yet another object of this invention to provide a method for measuring magnetic fields in which with automatic zero point setting and corresponding measuring value compensation, the local magnetic field and any occurring smaller interference fields are automatically considered and compensated for thereby minimizing false measurements.
It is yet another object of this invention to provide a device for measuring magnetic fields with which the measured value can be read off the measuring device as well as the probe body itself.
These and other objects of this invention are achieved by a method and device for measuring magnetic fields in which the device for measuring magnetic fields, having a magnetically sensitive probe and a measuring device, is activated, automatically measuring and setting the zero point and calculating and storing the resulting correction value. The probe is introduced into a magnetic field to be measured, automatically monitoring, using feedback, polarity and appropriately switching the measuring device. The peak value of the measured values is automatically stored with automatic adaptation of the measurement range of the device to the range of the magnetic field being measured. The measured values are then read, after which the probe is removed from the magnetic field and the measu
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T. Y. Fujita et al., "Portable Magnetic Field Dosimeter with Data Acquisition Capabilities", Review of Scientific Instruments, vol. 53, No. 3, pp. 326-331, Mar. 1982.
M. W. Poole and R. P. Walker, "Hall Effect Probes and Their Use in a Fully Automated Magnetic Measuring Systems", IEEE Transactions on Magnetics, vol. MAG-17, No. 5, pp. 2129-2132, Sep. 1981.
Maurer Albert
Meyer Urs
Maurer Magnetic AG
Strecker Gerard R.
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