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Calibrating method and system for field uniformity of transient electromagnetic field

A calibration method and electromagnetic field technology, applied in the direction of electromagnetic field characteristics, etc., can solve the problems of difficulty in realization, inconvenient use, and high cost, and achieve the effect of accurate calibration, convenient use and low requirements.

Inactive Publication Date: 2012-07-18
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] (2) It is usually necessary to use a high-voltage probe to monitor the output power of the pulse signal source, which is sometimes difficult to achieve in practical applications;
[0006] (3) The calibration time is long and inconvenient to use
[0008] (1) The pulse signal source needs to trigger multiple single pulse signals to output multiple single pulse signals, and the amplitude of each single pulse signal is difficult to be completely consistent, that is, there is a problem that each single pulse signal output by the pulse signal source is unstable, resulting in a uniform transient electromagnetic field The accuracy of sexual calibration is reduced;
[0009] (2) The requirement for the output stability of the pulse signal source leads to a higher cost of the transient electromagnetic field generating device

Method used

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  • Calibrating method and system for field uniformity of transient electromagnetic field
  • Calibrating method and system for field uniformity of transient electromagnetic field
  • Calibrating method and system for field uniformity of transient electromagnetic field

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Embodiment 1

[0034] Such as figure 1 As shown, the dual-probe system provided in this embodiment for calibrating the field uniformity of transient electromagnetic fields includes an oscilloscope 1 , a first probe 2 and a second probe 3 . Both the first probe 2 and the second probe 3 are electrically connected to the oscilloscope 1 . In this embodiment, both the first probe 2 and the second probe 3 are connected to the oscilloscope 1 through optical fibers, for example. The first probe 2 and the second probe 3 are used to sense the field strength of the electromagnetic field. The oscilloscope 1 is used to measure the output of the first probe 2 and / or the second probe 3 to calculate the field strength value.

[0035] Such as figure 2 As shown, the method for calibrating the field uniformity of the transient electromagnetic field provided in this embodiment includes the following steps:

[0036] Selecting a reference point and a plurality of measurement points in the area to be calibrat...

Embodiment 2

[0049] The dual-probe system for calibrating the field uniformity of the transient electromagnetic field provided in this embodiment is the same as that in Embodiment 1.

[0050] Such as figure 2 As shown, the method for calibrating the field uniformity of the transient electromagnetic field provided in this embodiment includes the following steps:

[0051] Selecting a reference point and a plurality of measurement points in the area to be calibrated, the positions of the reference point and the plurality of measurement points are different;

[0052]For each measurement point, measure the electromagnetic field of the measurement point and the reference point at the same time, respectively obtain the field strength value of each measurement point and the reference field strength value corresponding to the measurement point;

[0053] Calculate the normalized field strength value of the measurement point according to the field strength value of each measurement point and the re...

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Abstract

The invention discloses a calibrating method and a calibrating system for field uniformity of a transient electromagnetic field. The method comprises the steps of: selecting a reference point and a plurality of measuring points in an area to be calibrated, wherein the reference point is different from the measuring points in position; for each measuring point, measuring the electromagnetic field of the measuring point and the reference point simultaneously to respectively obtain the field intensity value of each measuring point and the reference field intensity value corresponding to the measuring point; calculating the normalized field intensity value of the measuring point according to the field intensity value of each measuring point and the reference field intensity value corresponding to the measuring point; and obtaining the field uniformity of the transient electromagnetic field in the area to be calibrated according to the normalized field intensity values of all measuring points. The system comprises an oscilloscope, a first probe and a second probe. The first and second probes are connected electrically with the oscilloscope. The method and the system have low requirements on a transient electromagnetic field generator comprising a pulse signal source and can calibrate the field uniformity of the transient electromagnetic field rapidly and accurately.

Description

technical field [0001] The invention relates to the technical field of calibrating the field uniformity of an electromagnetic field, in particular to a method for calibrating the field uniformity of a transient electromagnetic field. Background technique [0002] For radio frequency electromagnetic fields, the IEC61000 series standards provide two calibration methods for the field uniformity of electromagnetic fields, namely the constant field strength calibration method and the constant power calibration method. The constant field strength calibration method is to establish a uniform field with constant field strength by adjusting the forward output power, and then use a calibrated field strength probe to measure each point in each frequency band with a specified step size. The constant power calibration method is different in that the forward output power is kept constant during the measurement. [0003] For transient electromagnetic fields, the MIL-STD-461F standard uses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08
Inventor 姚利军沈涛
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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