Method, apparatus, and program for measuring an electromagnetic field and medium storing the program
Provided is a method, apparatus and program for calculating an electric-field vector that allows for grasping the intensity, direction and phase of electric field on a scanning plane for an appliance, and a medium storing the program. An electric-field vector at an origin is calculated, based on potential-difference vectors in respective coordinate directions calculated depending upon a detected signal of at least a magnitude and phase of an electric-field component current by arranging a scanning electric-field sensor at an origin of a desired coordinate system established near an object-to-be-measured, signals detected at respective coordinates by sequential movement to desired coordinates on respective coordinate axes, and a detected reference signal of at least a magnitude and phase of a current by fixedly arranging a fixed magnetic-field sensor close to the object-to-be-measured, and distances between coordinates calculated based on the coordinates the scanning electric-field sensor is arranged and the origin.
1. A method of measuring an electric-field vector formed by an electromagnetic radiation source, the method comprising:
detecting a reference signal comprising at least one of electric-field and magnetic-field component currents by fixedly placing a first probe near the radiation source;
detecting a first signal comprising at least an electric-field component current at a first location, by moving a second probe to the first location near the radiation source;
detecting a second signal comprising at least an electric-field component current at a second location by moving the second probe to the second location;
calculating a potential difference between the first and second signals based on at least in part the first signal, the second signal, and the reference signal;
calculating a distance between the first and second locations; and
calculating an electric-field vector at the first location based on at least in part the potential difference and the distance.
2. The method of claim 1 , further comprising calculating a distribution of electric-field vectors at multiple locations by sequentially moving the second probe to each location.
3. The method of claim 1 , further comprising;
detecting a third signal comprising at least a magnetic-field component current at a third location by moving a third probe to the third location; and
calculating a magnetic-field vector at the third location based on at least in part the third signal and the reference signal.
4. The method of claim 1 , further comprising
detecting a third signal comprising at least a magnetic-field component current at a first location when the second probe is moved to the first location; and
calculating a magnetic-field vector at the first location based on at least in part the third signal and the reference signal.
5. The method of claim 2 , further comprising calculating an electromagnetic-field intensity at a particular location distant from the radiation source based at least in part on the electric-field vector distribution.
6. The method of claim 3 , further comprising:
calculating a distribution of electric-field vectors at multiple locations by sequentially moving the second probe to each location;
calculating a distribution of magnetic-field vectors at multiple locations by sequentially moving the third probe to each location; and
calculating an electromagnetic-field intensity at a particular location distant from the radiation source based at least in part on the electric-field vector distribution and the magnetic-field vector distribution.
7. The method of claim 4 , further comprising:
calculating a distribution of electric-field vectors and distribution of magnetic-field vectors at multiple locations by sequentially moving the second probe to each location; and
calculating an electromagnetic-field intensity at a particular location distant from the radiation source based at least in part on the distribution of electric-field vectors and distribution of magnetic-field vectors.
8. An apparatus configured to measure an electromagnetic field formed by an electromagnetic radiation source, the apparatus comprising:
a first probe fixedly located near the radiation source for detecting a reference signal comprising at least one of electric-field and magnetic-field component currents;
a second probe near configured to be movable for detecting a signal comprising an electric-field component current at the location that the second probe moves to;
a computation unit configured to calculate the electric-field vector of the electromagnetic field based on signals generated by the first and the second probes; and
a control section configured to move the second probe to scan over the radiation source.
9. The apparatus of claim 8 , further comprising a third probe configured to be movable for detecting a signal comprising a magnetic-field component current at the location that the third probe moves to, wherein the computation unit is also configured to calculate a magnetic-field vector of the electromagnetic field based at least in part on signals generated by the first and the third probes.
10. The apparatus of claim 8 , wherein the second probe is further configured to detect a signal comprising a magnetic-field component current at the location of the second probe, and the computation unit is further configured to calculate a magnetic-field vector based at least in part on signals generated by the first and the second probes.
11. The apparatus of claim 8 , wherein the computation unit is further configured to calculate an electromagnetic-field intensity at a particular location distant from the radiation source, based at least in part on the electric-field vector at multiple locations.
12. The apparatus of claim 9 , wherein the computation unit is further configured to calculate a distribution of electric-field vectors and magnetic-field vectors at multiple locations and an electromagnetic-field intensity at a particular location distant from the radiation source based at least in part on signals generated from the first second, and third probes.
13. The apparatus of claim 10 , wherein the computation unit is further configured to calculate a distribution of electric-field vectors and magnetic-field vectors at multiple locations and an electromagnetic-field intensity at a particular location distant from the radiation source based at least in part on signals generated from the first and second probes.
14. A computer readable medium storing executable instructions for causing a general purpose computer to perform the calculating steps of claim 1 .
15. A computer readable medium storing executable instructions for causing a general purpose computer to perform the calculating steps of claim 3 .
16. A computer readable medium storing executable instructions for causing a general purpose computer to perform the calculating steps of claim 4 .
17. A computer readable medium storing executable instructions for causing a general purpose computer to perform the calculating steps of claim 5 .
18. A computer readable medium storing executable instructions for causing a general purpose computer to perform the calculating steps of claim 6 .
19. A computer readable medium storing executable instructions for causing a general purpose computer to perform the calculating steps of claim 7 .