A double-difference low-noise weak magnetic signal acquisition and processing device
A collection processing and collection device technology, which is applied in the field of double-difference low-noise weak magnetic signal collection and processing devices, can solve the problems of difficulty in metal isolation houses and interference of useful signals, etc.
Inactive Publication Date: 2017-06-06
TAIYUAN UNIV OF TECH
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Problems solved by technology
Of course, we can use the metal isolation method to measure and collect useful signals in a closed environment, but there will be two basic problems: first, as long as we use electronic equipment, it will cause interference to useful signals
Second, it is too difficult to build a metal insulation house that can meet the standard requirements
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[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0022] Such as figure 1 As shown, the double-difference low-noise weak magnetic signal acquisition and processing device in this embodiment mainly includes four parts: acquisition device, double-difference device, bias device, and reset device. Those skilled in the art should understand that although the sensor of this embodiment is shown in the form of a circuit diagram in the accompanying drawings, in a specific implementation, the sensor may have its own housing, external power supply and other supporting devices, and the sensor Circuits in can be presented in a three-dimensional manner, not limited to a planar structure.
[0023] The acquisition device includes two bridges composed of magneto-sensitive resistors and two ordinary resistors. When there is a magnetic field in the external environment, the resistance value of the magneto-sens...
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The invention provides a dual-differential type low noise weak magnetic signal collecting and processing device which comprises a collecting device, a dual-differential device, a bias device and a setting and resetting device. The collecting device comprises a first collecting circuit and a second collecting circuit, and each collecting circuit comprises bridges which are respectively formed by a magnetic sensing resistor and a common resistor. The dual-differential device receives signals collected by the two collecting circuits and carries out differential processing on the signals. The bias device comprises a geomagnetic field measurement device and a magnetic field generating device and is used for generating a counteracting magnetic field according to the intensity of a geomagnetic field. The setting and resetting device comprises a solenoid coil and a setting and resetting power source and is used for generating a strong magnetic field. According to the dual-differential type low noise weak magnetic signal collecting and processing device, influences of the geomagnetic field are eliminated through the bias device, nonlinear noise pulse interference is eliminated through the dual-differential device, and required weak magnetic signals can be effectively measured through a sensor.
Description
technical field [0001] The invention relates to the field of magnetic signal measurement, in particular to a double-difference low-noise weak magnetic signal acquisition and processing device. Background technique [0002] With the continuous development of science and technology and the continuous improvement of people's living standards, weak magnetic fields are used more and more widely around the world. High-precision detection technology is used to realize the analysis of weak magnetic signals, especially in the detection of human micro-magnetic fields and biological magnetic signals. Measurement, geomagnetic navigation, geomagnetic field measurement, space magnetic field measurement and other fields play a very important role. A magnetic sensor is a converter that converts a magnetic field into a corresponding electrical signal. There are many principles used to realize magnetic sensors, such as Hall effect, magnetoresistance effect, giant magnetoresistance effect, gi...
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IPC IPC(8): G01R33/09G01R33/025
Inventor 康爱国刘芳宇侯志文郭倩刘喆颉
Owner TAIYUAN UNIV OF TECH