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Background noise measuring method of magnetic antennas

A background noise and measurement method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of poor magnetic shielding effect and inaccurate measurement, and achieve the effect of overcoming the poor magnetic shielding effect

Active Publication Date: 2013-02-13
BEIJING MILESTONE SCI & TECH DEV +1
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Problems solved by technology

[0012] Purpose of the invention: In order to solve the problem of poor magnetic shielding effect and inaccurate measurement when directly measuring the background noise of the antenna, an indirect magnetic field measurement method is invented to obtain the equivalent antenna output voltage noise signal

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  • Background noise measuring method of magnetic antennas
  • Background noise measuring method of magnetic antennas
  • Background noise measuring method of magnetic antennas

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with specific embodiments.

[0039] A method for measuring the background noise of a magnetic field antenna, which uses a combination of measurement and mathematical calculation, and uses two antennas with good consistency and a spectral density calculation method to obtain an equivalent antenna output voltage noise signal. The steps include calibrating the antenna Consistency, measuring the antenna output signal and calculating the antenna voltage noise spectral density;

[0040] 1. Calibration antenna consistency

[0041] This step ensures that the transfer functions of the two antennas are consistent. The calibration is divided into the following three steps: 1) First, select two antennas with the same design, including all electrical parameters, materials, structural design, etc.; 2) Second, build a s...

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Abstract

The invention discloses a background noise measuring method of magnetic antennas. A method combining measuring and mathematical calculation is adopted, and the two antennas good in consistency and a spectrum density calculating method are used to obtain equivalent antenna output voltage noise signals. The background noise measuring method is characterized by comprising the steps of calibrating antenna consistency, measuring antenna output signals and calculating antenna voltage noise spectrum density. By means of the background noise measuring method, additional measuring instruments and shielding measures are not needed, the shortcomings of poor magnetic shielding effect and inaccurate measuring results in direct background noise measuring of the antennas can be overcome, and simultaneously the background noise measuring method is suitable for antennas with different sensitivity and particularly suitable for background noise measuring of magnetic antennas high in accuracy.

Description

technical field [0001] The invention belongs to the field of magnetic field measurement, in particular to a method for measuring background noise of a magnetic field antenna. Background technique [0002] In the application of magnetic field measurement, the antenna is the front end of the system, and its noise level is closely related to the signal detection capability. How to measure the noise level of its antenna is more complicated. This is because the signal strength of the useful magnetic field signal is often very weak due to the extremely fast attenuation, and its magnitude may be at the same level as the ambient magnetic field or smaller than the ambient magnetic field, so it is difficult to separate the useful magnetic field from the ambient magnetic field; The magnetic field signal is widely distributed and comes from various sources, so it is difficult to obtain the change law of the environmental magnetic field. This brings a series of problems such as measure...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 蔡希昌王爱敏
Owner BEIJING MILESTONE SCI & TECH DEV
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