Signal processing circuit of fluxgate sensor

A signal processing circuit and fluxgate sensor technology, which is applied to magnetic field measurement using the principle of magnetic flux control, the size/direction of the magnetic field, and measurement using digital measurement technology. Complex production, high cost and other problems, to achieve the effect of convenient debugging and system upgrade, low power consumption, small size

Inactive Publication Date: 2012-12-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Conventional fluxgate signal processing circuits use analog circuits to analyze and process signals, which leads to very complicated fabrication of processing circuit boards, large product volume, high power consumption, and high cost; low measurement accuracy, and it is not easy to implement the system upgrade and debug

Method used

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  • Signal processing circuit of fluxgate sensor
  • Signal processing circuit of fluxgate sensor
  • Signal processing circuit of fluxgate sensor

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The fluxgate sensor uses a high-permeability magnetic core to gate and modulate the DC magnetic field component under saturated alternating excitation, and converts the DC magnetic field into an AC voltage output, thereby achieving the purpose of measuring the external magnetic field. Its basic structure is as figure 1 shown.

[0031] The excitation coil and the induction coil are wound on an iron core. According to Faraday's law of electromagnetic induction, the induced potential on the induction coil is:

[0032] e = - 10 - 8 d dt ( WμHS )

...

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Abstract

The invention discloses a signal processing circuit of a fluxgate sensor. The signal processing circuit of the fluxgate sensor comprises a DSP (digital signal processor) and a signal feedback unit; an environment voltage signal collected by a fluxgate probe is linked with a digital signal processor through a bridging circuit and a programmable gain amplifier; the signal feedback unit feeds the processing signal of the digital signal processor back to the front end of the bridging circuit; the DSP comprises an analogue-digital converter, a digital frequency selector, a phase sensitive detector and a magnetic field calibrating module; the signal feedback unit comprises an interpolation calculation module, the analogue-digital converter and the programmable gain amplifier; the DSP receives the signal of the fluxgate probe, and outputs the size of the tested environment magnetic field by means of analogue-digital conversion, digital frequency selecting filtering, phase-sensitive rectifying and magnetic field calibration orderly; the measurement precision and the product performance of the fluxgate sensor are improved by digital treatment of the environment signal, so that adjustment and upgrade of the system are more convenient.

Description

technical field [0001] The present invention relates to the technical field of fluxgate electronic circuits, more specifically, to a fluxgate sensor signal processing circuit, which collects the original signal of the fluxgate and obtains the second harmonic of the fluxgate signal through mathematical calculation, In order to achieve the purpose of measuring the peripheral magnetic field. Background technique [0002] In the early 1930s, fluxgate technology appeared, which can measure constant and low-frequency weak magnetic fields. The potential characteristics of the even harmonic components that change with the environmental magnetic field appear, and the even harmonic components are measured through a high-performance fluxgate conditioning circuit to measure the magnitude of the environmental magnetic field. The fluxgate sensor is a sensor that uses the non-linear relationship between the magnetic induction intensity and the magnetic field intensity of the high-permeabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/04G01R19/25
Inventor 申瑞臣胡杰田中兰乔磊彭劲松董胜伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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