Combined magnetic field sensor and weak magnetic field measuring device
A combined magnetic field and measurement device technology, applied in measurement devices, measurement of magnetic variables, instruments, etc., can solve the problems of annihilation measurement systems, weak Hall sensor signals, and difficulty in measuring weak magnetic fields, and achieve the effect of improving resolution.
Inactive Publication Date: 2016-01-06
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
However, in a weak magnetic field less than 1mT, the output signal of the Hall sensor is also very weak, which is easily lost in the interference and noise of the measurement system
To get a larger output signal, it is necessary to increase the operating current, but this will affect the thermal performance of the Hall element
Therefore, it is difficult to measure weak magnetic fields with ordinary Hall effect magnetic sensors
Method used
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[0055] Such as figure 2 As shown, the weak magnetic field measuring device includes a combined magnetic field sensor. The combined magnetic field sensor includes a Hall plate 2 and a soft magnetic material rod 1 . The normal direction of the Hall plate 2 is the same as the axial direction of the soft magnetic material rod 1 . It also includes a Hall sheet power supply 4 electrically connected to the Hall sheet 2, an output electrical signal amplifying circuit 5 electrically connected to the Hall sheet, a demagnetization device 3 used for demagnetizing the soft magnetic material rod, and an electrical connection with the output electrical signal amplifying circuit 5. Connected magnetic field strength display module 6.
[0056] When measuring the weak magnetic field strength, compared with the common Hall sensor, the weak magnetic field measuring device of the present invention can measure the amplified Hall voltage output. The magnification is related to the length-to-diamete...
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The invention discloses a combined type magnetic field sensor and a weak magnetic field measuring device. The combined type magnetic field sensor comprises a Hall piece and a soft magnetic material rod, wherein a normal direction of the Hall piece and an axial direction of the soft magnetic material rod are the same. The weak magnetic field measuring device comprises the combined type magnetic field sensor, a Hall piece power supply and an output electric signal amplifying circuit, wherein the Hall piece power supply is electrically connected with the Hall piece, and the output electric signal amplifying circuit is electrically connected with the Hall piece. By adopting the weak magnetic field measuring device disclosed by the invention, an output electric signal of a Hall sensor can be greatly enhanced, and automatic measuring and data output processing are favorably carried out on a weak magnetic field. A method and an instrument for measuring the weak magnetic field are excellent in performance and lower in cost.
Description
technical field [0001] The invention relates to the field of magnetic field measurement and is an improvement to a measuring device using a Hall sensor. Background technique [0002] Hall effect magnetic sensor has high conversion rate and good linear response in magnetic field measurement, and can be used to measure both constant magnetic field and alternating magnetic field. However, in a weak magnetic field less than 1mT, the output signal of the Hall sensor is also very weak, and it is very easy to be lost in the interference and noise of the measurement system. To obtain a larger output signal, it is necessary to increase the operating current, but this will affect the thermal performance of the Hall element. Therefore, it is difficult to measure weak magnetic fields by using ordinary Hall effect magnetic sensors. Contents of the invention [0003] The object of the present invention is to provide a combined magnetic field sensor and a weak magnetic field measuring ...
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IPC IPC(8): G01R33/07
Inventor 叶晓靖张伟新
Owner SOUTH CHINA UNIV OF TECH