Electromagnetic field distribution measuring method, apparatus for the method, computer program and information recording medium

• US 8,219,332 B2
• Filed: 01/31/2011
• Issued: 07/10/2012
• Est. Priority Date: 01/11/2005
• Status: Active Grant

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: Kazama, Satoshi, Hori, Keigo, Tsutagaya, Hiroshi
• Primary Examiner(s): WACHSMAN, HAL D
• Application Number:
  US13/017,642
• Publication Number:
  US 20110125429A1
• Time in Patent Office: 526 Days
• Field of Search: 702/57, 702/60, 702/65, 702/76
• US Class Current: 702/57
• CPC Class Codes: G01R 29/0871 Complete apparatus or systems; circuits, e.g. receivers or amplifiers G01R29/0878, G01R29/0892 take precedence; dosimeters, warning devices G01R29/0857
• CPC Class Codes: G01R 29/10 Radiation diagrams of antennas
• CPC Class Codes: G01R 31/001 Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing measuring electromagnetic fields G01R29/08; circuits for generating HV pulses in dielectric strength testing G01R31/14

Abstract

Electromagnetic field distribution is measured by considering time variations of a measured electric and/or magnetic field value. In response to scanning performed with a probe at an arbitrary set of measurement coordinates in a predetermined measurement plane in the vicinity of an object to be measured, a signal is detected at each of plural sets of coordinates in a measurement plane. Electric and magnetic fields are computed during a measurement time period at each set of measurement coordinates in the measurement plane based on measurement coordinates where the probe is positioned and the signal is detected with the probe. Amplitude probability distribution during the time period at each set of measurement coordinates in the vicinity of the object is computed based on the computed intensity, then mapped and displayed.

Claims

1. An electromagnetic field distribution measuring apparatus that detects intensity of either an electric field or a magnetic field, or both, in an arbitrary frequency band of an object to be measured so as to measure an electromagnetic field distribution, comprising:

a detecting section that detects fluctuation of the intensity during a predetermined measurement time period in a space in the vicinity of the object to be measured at a plurality of measurement positions;

a computing section that computes an amplitude probability distribution, which shows a statistical distribution of related probabilities and amplitudes, of fluctuation of the intensity detected by the detecting section; and

a mapping section that maps the distribution of the intensity in an arbitrary measurement area by using an amplitude value of the amplitude probability distribution when a probability value of the amplitude probability distribution is a predetermined value at each of the plurality of measurement positions.

2. The electromagnetic field distribution measuring apparatus according to claim 1, wherein the mapping section includes:

a dividing section for division to a respective rank of the amplitude values of the amplitude probability distribution when a probability value of the amplitude distribution is a predetermined value; and

a mapping section that maps the distribution by using the ranks.

3. The electromagnetic field distribution measuring apparatus according to claim 1, wherein the detecting section detects the intensity in each of a plurality of frequency bands;

and the mapping section performs the mapping for each of the plurality of frequency bands.

4. The electromagnetic field distribution measuring apparatus according to claim 1, wherein the detecting section includes a section that detects intensity by scanning a probe for detecting the intensity of either the electric field or the magnetic field, or both, in the space in the vicinity of the object to be measured.

5. The electromagnetic field distribution measuring apparatus according to claim 1, wherein the detecting section detects each fluctuation of the intensity during a predetermined time period in a space in the vicinity of the object to be measured at a plurality of measurement positions.

6. An electromagnetic field distribution measuring apparatus that detects intensity of either an electric field or a magnetic field, or both, in an arbitrary frequency band of an object to be measured so as to measure an electromagnetic field distribution, comprising:

a detecting section that detects fluctuation of the intensity during a predetermined measurement time period in a space in the vicinity of the object to be measured at a plurality of measurement positions;

a computing section that computes an amplitude probability distribution, which shows a statistical distribution of related probabilities and amplitudes, of the fluctuation of the intensity detected by the detecting section; and

a mapping section that maps the distribution of the intensity in an arbitrary measurement area by using a probability value of the amplitude probability distribution when an amplitude value of the amplitude probability distribution is a predetermined value at each of the plurality of measurement positions.

7. The electromagnetic field distribution measuring apparatus according to claim 6, wherein the mapping section includes:

a dividing section for division to a respective rank of the probability value of the amplitude probability distribution when an amplitude value of the amplitude probability distribution is a predetermined value; and

a mapping section that maps the distribution by using ranks.

8. The electromagnetic field distribution measuring apparatus according to claim 6, wherein the detecting section detects the intensity in each of a plurality of frequency bands;

and the mapping section performs the mapping for each of the plurality of frequency bands.

9. The electromagnetic field distribution measuring apparatus according to claim 6, wherein the detecting section includes a section that detects intensity by scanning a probe for detecting the intensity of either the electric field or the magnetic field, or both, in the space in the vicinity of the object to be measured.

10. The electromagnetic field distribution measuring apparatus according to claim 6, wherein the detecting section detects each fluctuation of the intensity during a predetermined time period in a space in the vicinity of the object to be measured at a plurality of measurement positions.