MAGNETIC FIELD PROBE APPARATUS AND A METHOD FOR MEASURING MAGNETIC FIELD
First Claim
1. A magnetic field probe apparatus comprising a probe element for detecting the magnetic field generated by a measurement object;
- at least a pair of transmission lines connected with each other via a load element across which a voltage is developed or in which a current is induced, in response to the detection of the magnetic field by means of the probe element; and
a control device for controlling the position of the probe element with respect to the measurement object;
wherein the probe element includes at least one conductor line having both its ends extending in the direction opposite to that direction in which the probe element approaches the measurement object under the control of the control device for measurement; and
at least one end of the one conductor line is disposed opposite to and separated at a distance from, one of the transmission lines in an area remote from the measuring portion of the probe element so that electric capacitance may be formed between the one end of the one conductor line and the one of the transmission lines.
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Accused Products
Abstract
A magnetic field probe apparatus includes a loop-like conductor and feeder lines spaced at a distance from the loop-like conductor. The shape of the loop-like conductor and the arrangement of the feeder lines are adjusted in such a manner that the resonance frequency determined by the combination of the inductance of the loop-like conductor line and the capacitance formed between the looped-conductor and the feeder lines, is matched to the frequency of the magnetic field generated by and in the vicinity of a measurement object (e.g. electronic device) or the frequency of the electric signal which generates the magnetic field. With the magnetic field probe apparatus according to this invention, the magnetic field in the vicinity of the measurement object can be measured with high sensitivity.
19 Citations
22 Claims
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1. A magnetic field probe apparatus comprising a probe element for detecting the magnetic field generated by a measurement object;
- at least a pair of transmission lines connected with each other via a load element across which a voltage is developed or in which a current is induced, in response to the detection of the magnetic field by means of the probe element; and
a control device for controlling the position of the probe element with respect to the measurement object;
whereinthe probe element includes at least one conductor line having both its ends extending in the direction opposite to that direction in which the probe element approaches the measurement object under the control of the control device for measurement; and
at least one end of the one conductor line is disposed opposite to and separated at a distance from, one of the transmission lines in an area remote from the measuring portion of the probe element so that electric capacitance may be formed between the one end of the one conductor line and the one of the transmission lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- at least a pair of transmission lines connected with each other via a load element across which a voltage is developed or in which a current is induced, in response to the detection of the magnetic field by means of the probe element; and
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20. A method for measuring the spatial distribution of the intensity and orientation of the magnetic field generated by a measurement object on the basis of the voltage or current generated in a probe element placed in the vicinity of the measurement object so as to interact with the magnetic field, wherein a series resonance circuit consisting of at least one inductance and at least one capacitance is formed with at least one conductor line and a pair of transmission lines included in the probe element, the pair of transmission lines being connected with each other via a load element across which a voltage is developed or in which a current is induced;
- and the inductance and the capacitance of the series resonance circuit are adjusted in such a manner that the voltage or the current is maximized at the specific frequency of the magnetic field generated by the measurement object.
- View Dependent Claims (21, 22)
Specification