CN102565723A - Flux-gate type wide-range magnetometer - Google Patents
Flux-gate type wide-range magnetometer Download PDFInfo
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- CN102565723A CN102565723A CN2012100133589A CN201210013358A CN102565723A CN 102565723 A CN102565723 A CN 102565723A CN 2012100133589 A CN2012100133589 A CN 2012100133589A CN 201210013358 A CN201210013358 A CN 201210013358A CN 102565723 A CN102565723 A CN 102565723A
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Abstract
The invention relates to the field of measurement tools, in particular to a flux-gate type wide-range magnetometer which is characterized in that a magnetic field measurement circuit comprises an oscillation excitation circuit, a filtering, phase-sensitive demodulating and integrating circuit, a feedback circuit and a calibrating circuit, wherein the oscillation excitation circuit is connected with the probe and the filtering, phase-sensitive demodulating and integrating circuit, and the calibrating circuit is connected with the oscillation excitation circuit. The invention has the advantage of realizing three-component high-resolution (1nT) and high precision (0.2%) measurement of a strong magnetic field with a range of -2000mu T-2000muT. An embedded control system structure is adopted in the flux-gate type wide-range magnetometer, the characteristics of VFD (Vacuum Fluorescent Display) large-screen display, convenience for operation and visual display are obtained, and functions of automatic zero calibration and automatic measurement are achieved. The flux-gate type wide-range magnetometer is stable and reliable, can be used for carrying out measurement and recording automatically for a long time, provides multiple forms of communication interfaces such as internet, USB and RS-232 communication interface, and has the advantages of small volume and light weight.
Description
Technical field
The present invention relates to a kind of measuring appliance field, especially a kind of fluxgate type wide-range magnetometer.
Background technology
In the ship degassing process; Degaussing cable produces the high-intensity magnetic field of intensity up to 1600A/M in naval vessels surrounding space zone; This high-intensity magnetic field will bring influence to the technical feature and the security of the magnetosensitive sense parts of On-Board System, equipment, be accurately to grasp the exact level that should influence with analysis and assessment, and the high-intensity magnetic field in the time of need be to demagnetization is accurately measured; But owing to lack the detection means to this type of high-intensity magnetic field, this work can't be carried out always.
Summary of the invention
The objective of the invention is weak point according to above-mentioned prior art; A kind of fluxgate type wide-range magnetometer is provided; This magnetometer is through improvement and optimize fluxgate sensor structure, parameter; Advanced control, measurement and signal processing technology are adopted in the design of innovation metering circuit, realize the measurement of wide-range high-intensity magnetic field.
Realization of the present invention is accomplished by following technical scheme: a kind of fluxgate type wide-range magnetometer; Comprise magnetic-field measurement module and acquisition control module; Said magnetic-field measurement module comprises probe, magnetic-field measurement circuit, and said probe connects the magnetic-field measurement circuit, and it is characterized in that: described magnetic-field measurement circuit comprises the vibratory stimulation circuit; Filtering, phase demodulation and integrating circuit; Feedback circuit and calibration circuit, said vibratory stimulation circuit connects probe and filtering, phase demodulation and integrating circuit, and said calibration circuit is connected with said vibratory stimulation circuit.
Said vibratory stimulation circuit is made up of counter, crystal resonator, amplifying circuit driving transformer, NPN triode and PNP triode; A pin of said counter inserts crystal resonator; And be connected with the amplifying circuit driving transformer through NPN triode and PNP triode, said amplifying circuit driving transformer connects probe.
Described filtering, phase demodulation and integrating circuit are realized that by bandpass filtering, phase demodulation, integration module a pin in said bandpass filtering, phase demodulation, the integration module connects probe, another pin output magnetic field magnitude of voltage.
Described feedback circuit is made up of two-way precision constant current source circuit and relay commutation circuit; Said two-way precision constant current source circuit is connected with the relay commutation circuit respectively, and said feedback circuit is communicated with the pin of output magnetic field magnitude of voltage in said bandpass filtering, phase demodulation, the integration module.
Described two-way precision constant current source circuit is divided into journey constant-current source circuit and wide range constant-current source circuit in a small amount.
Described calibration circuit is a current pump type ground connection load voltage controlled current source, by precision voltage source Voltage Reference is provided, and produces stable electric current with sample resistance, and is connected with relay, and whether the alignment coil of said relay control access probe.
Advantage of the present invention is: the scope that realized is measured for three-component, high resolving power (1nT) and the high precision (0.2%) of-2000 μ T～+ 2000 μ T high-intensity magnetic fields.Instrument adopts the embedded control system structure, the VFD large screen display, and easy to operate, intuitive display has automatic zero adjustment, automatic range function.Instrument stabilizer, reliable can be measured and record for a long time automatically, Ethernet, USB and RS-232 communication various ways communication interface is provided, and has little, the lightweight advantage of volume.
Description of drawings
Fig. 1 is an instrument composition frame chart of the present invention;
Fig. 2 is magnetic-field measurement circuit theory diagrams of the present invention;
Fig. 3 is a vibratory stimulation circuit diagram of the present invention;
Fig. 4 is filtering of the present invention, phase demodulation and integrating circuit figure;
Fig. 5 is feedback circuit figure of the present invention;
Fig. 6 is calibration circuit figure.
Embodiment
Through embodiment characteristic of the present invention and other correlated characteristic are done further explain below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Embodiment: the high-intensity magnetic field survey record appearance based on embedded control system as shown in Figure 1 mainly partly is made up of ARM controller, probe, magnetic-field measurement circuit, VFD display module, data storage circuitry, real time clock circuit, keyboard and USB, serial interface circuit, cpu monitor circuit and power supply etc.
As shown in Figure 2, the magnetic-field measurement circuit is made up of probe, vibratory stimulation circuit, circuitry for signal measurement and four parts of calibration circuit.Circuit adopts closed-loop system, with range for measuring that improves probe and the precision that guarantees measurement.When measuring wide range, adopt the feedback resistance automatic switch-over circuit, adjust feedback factor automatically and adjust gain, be implemented under the situation that does not influence stability and resolution and can reach ± measurement range of 2000 μ T with journey magnetic field in a small amount.
As shown in Figure 3, counter CD4060 inserts the vibration that the 2.5MHz crystal resonator produces 2.5MHz, and produces the probe pumping signal of 5KHz and the phase sensitive detection switching signal of 10KHz through its tally function at 13 pin and 14 pin.The square wave of 5KHz is through by two PNP triode 2N4403 and two complementary push-pull power amplification circuit driving transformer CH1 that NPN triode 2N4401 constitutes, and is extremely saturated through the CH1 incentive probe, probe beginning this moment collecting work.
As shown in Figure 4; Bandpass filtering, phase demodulation, integrating function are realized by the 704 MC-1510 modules that designed; The signal of probe output inserts the 1st pin of MC-1510 module; The phase sensitive detection signal of 10KHz inserts the 5th pin of MC-1510 module, and the signal BFX behind the 2nd pin output integration is used for feedback, and Vo1 is the magnetic field magnitude of voltage of output.
As shown in Figure 5, the feedback commutation circuit is made up of two-way precision constant current source circuit and relay commutation circuit.Amplifier OPA2227 and differential amplifier INA105 and sample resistance R16 form journey constant current source feedback and BUF634 and R17 composition wide range constant current source feedback in a small amount among the figure.Constant current source adopts the design of current pump type ground connection load voltage controlled current source, has the high characteristics of Current Control precision.Feedback adopts constant-current source circuit can guarantee the stability of feedback factor in the total temperature scope, and BUF634 is an electric current power amplifier chip, guarantees when large range measuring, can feed back enough electric currents, thereby produces enough feedback magnetic fields.Commutation circuit is with the ANG20012 small size signal relay design of PANASONIC; Its contact resistance is less than 100m Ω; Isolation resistance is greater than 1G Ω, and switch life is greater than 105 times, and relay is through photoelectric isolated chip PS2502-2 switch; When the isolation of guaranteeing relay circuit and control circuit reduces relay switch to the influence of signal circuit; PS2502-2 needs the drive current of 10mA, and the control signal DIO1 of M2378-CFN20I industry control module can only provide the rated current of 4mA, so PS2502-2 drives through NPN triode 9013.
As shown in Figure 6, calibration circuit is a current pump type ground connection load voltage controlled current source.Provided+the 5V Voltage Reference by precision voltage source REF02, produce stable 2.5mA with 2K sample resistance R22, the alignment coil that inserts probe by the control of AGN20012 relay whether.
In sum; Present embodiment adopts the metering circuit design of innovation; Subsidiary have automatic calibration circuit, and can meet technical requirement that wide-range surveys magnetic and to the protection and the preventive measure of the safety of On-Board System and equipment and performance impact, research correspondence essential technological means is provided for the assessment demagnetization: for the examination and the quality inspection of the newly-built degaussing stations of naval, degaussing ship provides new testing tool; For improvement demagnetization technology, raising demagnetization quality provide new test method, magnetic defense ability, guarantee ship navigating and the equipment that strengthens naval vessels gone entirely, keeps and improve naval's fighting capacity to have crucial meaning.
Claims (6)
1. fluxgate type wide-range magnetometer; Comprise magnetic-field measurement module and acquisition control module; Said magnetic-field measurement module comprises probe, magnetic-field measurement circuit, and said probe connects the magnetic-field measurement circuit, and it is characterized in that: described magnetic-field measurement circuit comprises the vibratory stimulation circuit; Filtering, phase demodulation and integrating circuit; Feedback circuit and calibration circuit, said vibratory stimulation circuit connects probe and filtering, phase demodulation and integrating circuit, and said calibration circuit is connected with said vibratory stimulation circuit.
2. a kind of fluxgate type wide-range magnetometer according to claim 1; It is characterized in that: said vibratory stimulation circuit is made up of counter, crystal resonator, amplifying circuit driving transformer, NPN triode and PNP triode; A pin of said counter inserts crystal resonator; And be connected with the amplifying circuit driving transformer through NPN triode and PNP triode, said amplifying circuit driving transformer connects probe.
3. a kind of fluxgate type wide-range magnetometer according to claim 1; It is characterized in that: described filtering, phase demodulation and integrating circuit are realized by bandpass filtering, phase demodulation, integration module; A pin in said bandpass filtering, phase demodulation, the integration module connects probe, another pin output magnetic field magnitude of voltage.
4. a kind of fluxgate type wide-range magnetometer according to claim 1; It is characterized in that: described feedback circuit is made up of two-way precision constant current source circuit and relay commutation circuit; Said two-way precision constant current source circuit is connected with the relay commutation circuit respectively, and said feedback circuit is communicated with the pin of output magnetic field magnitude of voltage in said bandpass filtering, phase demodulation, the integration module.
5. a kind of fluxgate type wide-range magnetometer according to claim 4 is characterized in that: described two-way precision constant current source circuit is one tunnel a small amount of journey constant-current source circuit and one road wide range constant-current source circuit.
6. a kind of fluxgate type wide-range magnetometer according to claim 1; It is characterized in that: described calibration circuit is a current pump type ground connection load voltage controlled current source; By precision voltage source Voltage Reference is provided; Produce stable electric current with sample resistance, and be connected with relay, whether the alignment coil of said relay control access probe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100133589A CN102565723A (en) | 2012-01-17 | 2012-01-17 | Flux-gate type wide-range magnetometer |
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| CN2012100133589A CN102565723A (en) | 2012-01-17 | 2012-01-17 | Flux-gate type wide-range magnetometer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044629A (en) * | 2015-05-18 | 2015-11-11 | 西北工业大学 | Fluxgate sensor feedback circuit |
| CN105676151A (en) * | 2016-01-18 | 2016-06-15 | 华东师范大学 | Negative feedback type magnetic field sensor |
| CN106405189A (en) * | 2016-08-14 | 2017-02-15 | 河北工业大学 | Current sensor with temperature stability and measuring method thereof |
| CN106443805A (en) * | 2016-11-22 | 2017-02-22 | 中国地震局地球物理研究所 | Signal detection circuit of magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer |
| CN109581262A (en) * | 2018-08-30 | 2019-04-05 | 李涛 | A kind of CCY-2 type magnetometer measurement accuracy detection device and its application method |
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| CN2070914U (en) * | 1990-06-29 | 1991-02-06 | 西北工业大学 | Gate type megnetic force meter for testing magnetic flux |
| US6316939B1 (en) * | 1999-09-10 | 2001-11-13 | Tdk Corporation | Magnetic sensor measuring apparatus and current sensor non-contact measuring apparatus |
| CN201819983U (en) * | 2010-10-28 | 2011-05-04 | 上海海事大学 | PCB (printed circuit board) of digital flux-gate magnetometer |
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| CN2070914U (en) * | 1990-06-29 | 1991-02-06 | 西北工业大学 | Gate type megnetic force meter for testing magnetic flux |
| US6316939B1 (en) * | 1999-09-10 | 2001-11-13 | Tdk Corporation | Magnetic sensor measuring apparatus and current sensor non-contact measuring apparatus |
| CN201819983U (en) * | 2010-10-28 | 2011-05-04 | 上海海事大学 | PCB (printed circuit board) of digital flux-gate magnetometer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044629A (en) * | 2015-05-18 | 2015-11-11 | 西北工业大学 | Fluxgate sensor feedback circuit |
| CN105044629B (en) * | 2015-05-18 | 2018-06-19 | 西北工业大学 | A kind of fluxgate sensor feedback circuit |
| CN105676151A (en) * | 2016-01-18 | 2016-06-15 | 华东师范大学 | Negative feedback type magnetic field sensor |
| CN105676151B (en) * | 2016-01-18 | 2018-06-22 | 华东师范大学 | A kind of negative feedback magnetic field sensor |
| CN106405189A (en) * | 2016-08-14 | 2017-02-15 | 河北工业大学 | Current sensor with temperature stability and measuring method thereof |
| CN106443805A (en) * | 2016-11-22 | 2017-02-22 | 中国地震局地球物理研究所 | Signal detection circuit of magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer |
| CN106443805B (en) * | 2016-11-22 | 2019-02-19 | 中国地震局地球物理研究所 | A kind of signal deteching circuit and the flux-gate magnetometer of flux-gate magnetometer |
| CN109581262A (en) * | 2018-08-30 | 2019-04-05 | 李涛 | A kind of CCY-2 type magnetometer measurement accuracy detection device and its application method |
| CN109581262B (en) * | 2018-08-30 | 2021-08-31 | 李涛 | CCY-2 type magnetism measuring instrument measurement accuracy detection device and use method thereof |
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Application publication date: 20120711 |