Steady weak magnetic-field measurement apparatus based on Wigan effect
A weak magnetic field and measuring instrument technology, applied in the direction of the size/direction of the magnetic field, can solve the problems of poor temperature stability and easy damage, and achieve the effects of easy portability, simple measurement operation, and small size
Inactive Publication Date: 2013-03-20
FOSHAN UNIVERSITY
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Problems solved by technology
Although the Hall device used in the measurement method based on the Hall effect has high sensitivity and small size, its temperature stability is poor, the accuracy is generally only 0.5% to 5%, and it is easy to damage
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[0020] The present invention is described in further detail by the following examples.
[0021] see Figure 1-4 As shown, a stable and constant weak magnetic field measuring instrument based on the Wiegand effect of the present invention is composed of a DC power supply 1, a stable and weak magnetic field measuring rod 8, a digital acquisition card 5, and a computer 6, and the stable and constant weak magnetic field measured by the support 7 The rod 8 is composed of a probe 3, a high-speed motor 4, and a rotating shaft 9 and is wrapped by a casing. The probe 3 is composed of a Wiegand sensor 3-1, a commutator 3-2, and a brush 3-3. The commutator 3-2 is composed of the first lobe commutator 3-2-1 and the second lobe commutator 3-2-2, and the arc range of the first lobe commutator 3-2-1 is 210°- 170°, 240° is selected in this example, and the arc range of the second lobe commutator 3-2-2 is 90°-150°, 120° is selected in this example. The commutator 3-2 is fixed on the rotating...
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The invention discloses a steady weak magnetic-field measurement apparatus based on Wigan effect. The magnetic-field measurement apparatus comprises a direct current power supply, a Wigan sensor, a data collecting card and a computer, wherein the output end of the data collecting card is connected with the input port of the computer with software written by LabVIEW. The magnetic-field measurement apparatus is further provided with a steady weak magnetic-field measurement bar which is composed of a probe, a high speed motor and a rotation shaft and is coved by a shell, wherein the high speed motor drives the probe to rotate at high speed through the rotation shaft; the probe is arranged in a steady weak magnetic-field to be measured; and the signal output end of the probe is connected with the input end of the data collecting card. The measurement apparatus can correctly measure the steady weak magnetic-field within a small range and displays the magnitude and the direction of the measured magnetic-field on the computer.
Description
technical field [0001] The invention relates to the technical field of steady and weak magnetic field measurement, in particular to a steady and constant weak magnetic field measuring instrument based on the Wiegand effect. Background technique [0002] In recent years, with the continuous development of magnetic field measurement technology, the measurement range has reached 10 -15 ~10 3 T has been widely used in various fields such as geophysics, space technology, military engineering, industry, biology, medicine, and archaeology. At present, the relatively mature magnetic field measurement methods mainly include electromagnetic induction method, Hall effect method, magnetic saturation method, nuclear magnetic resonance method, superconducting effect method and magneto-optical effect method. [0003] Different measurement methods are suitable for different measurement ranges and have different measurement requirements. For the measurement of a steady magnetic field, the...
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IPC IPC(8): G01R33/02
Inventor 曹辉李成龙梁兆基江少青
Owner FOSHAN UNIVERSITY