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Syntony type radio frequency magnetic probe

A magnetic probe and radio frequency technology, applied in the direction of the size/direction of the magnetic field, using magneto-optical equipment for magnetic field measurement, etc., can solve the problems of increasing the cost of the magnetic probe system, achieve simple structure, low cost, and suppress capacitive Effect of Coupling Common Mode Signals

Inactive Publication Date: 2008-03-12
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: (1) the cost of the magnetic probe system is increased by using a high-frequency amplifier; (2) even if a high-frequency amplifier is used, it is still necessary to increase the magnetic induction signal at the input end of the amplifier

Method used

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  • Syntony type radio frequency magnetic probe
  • Syntony type radio frequency magnetic probe
  • Syntony type radio frequency magnetic probe

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Embodiment Construction

[0035] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0036] The overall structure of the RF magnetic probe is shown in Figure 1. The circular magnetic probe coil 1 is made of metal wire (Fig. 2a, b). The metal wire is copper wire in the room temperature measurement environment; the probe coil is made of tungsten wire in the plasma discharge high temperature and vacuum environment, and is sealed with a quartz tube. lead wire and twinax. The plane where the lead wire of the magnetic probe coil 1 is located is perpendicular to the coil plane, so as to improve calibration accuracy and spatial measurement resolution. The lead wire of the magnetic probe coil is connected to the dual coaxial cable 2, which is made of two single coaxial cables with a characteristic impedance of 50Ω (Figure 3): take two single coaxial cables with the same length, and strip the insulation The outer s...

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Abstract

The present invention discloses a resonance radio frequency magnetic probe, which is characterized in that the probe utilizes a resonance transformer to increase high output voltage breath, synchronously adopts a spurious capacitive coupling between a primary coil and a secondary coil of a plane discrete Faraday shield transformer to solve problems of lower output signals and serious common mode interference of radio frequency magnetic field measuring. The resonance radio frequency magnetic probe comprises a resonance transformer. The resonance transformer is provided with a probe coil, a Faraday shield, a hollow plane primary coil and a secondary coil. In addition, the primary coil is provided with a grounded center tap. Both sides of the coil are connected with a variable capacitance in parallel. The secondary coil is connected with a variable capacitance in series. The Faraday shield structure is arranged between the primary and secondary coil of the resonance transformer, of which they are discrete. The present invention has the benefits of simple structure, lower cost and high SNR of the magnetic probe.

Description

technical field [0001] The invention belongs to a resonance type radio frequency magnetic probe used for radio frequency magnetic field measurement. Background technique [0002] The magnetic probe signal is obtained by the detection coil. According to Faraday's law of electromagnetic induction, when the magnetic field at the detection coil changes, the magnetic induction electromotive force ε generated at both ends of the coil [0003] [0004] Among them, S eff = NS is the effective area of ​​the coil, N is the number of turns of the coil, and S is the cross-sectional area of ​​the coil. [0005] After the magnetic probe is calibrated by using an alternating magnetic field with known strength, the magnetic induction intensity of the magnetic field to be measured can be calculated from the measured induced electromotive force. In the fields of basic research and technical applications, magnetic probe measurement has been used in important applications, such as low-temp...

Claims

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Application Information

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IPC IPC(8): G01R33/02G01R33/032
Inventor 丁振峰袁国玉
Owner DALIAN UNIV OF TECH