CN103969603B - fluxgate magnetic gradiometer and coaxial adjusting method thereof - Google Patents
fluxgate magnetic gradiometer and coaxial adjusting method thereof Download PDFInfo
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- CN103969603B CN103969603B CN201410200464.7A CN201410200464A CN103969603B CN 103969603 B CN103969603 B CN 103969603B CN 201410200464 A CN201410200464 A CN 201410200464A CN 103969603 B CN103969603 B CN 103969603B
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Abstract
The invention relates to a fluxgate magnetic gradiometer and a coaxial adjusting method of the fluxgate magnetic gradiometer, and belongs to the field of low-intensity magnetic field detection. According to the fluxgate magnetic gradiometer, adjusting screw holes are formed in a pair of parallel side walls of box bodies of mounting boxes at the two ends of a feeler lever of the gradiometer respectively, the offside walls, with the adjusting screw holes, on the two mounting boxes are perpendicular, and sensitive shafts of two single-shaft fluxgate sensors are coaxially fixed in the mounting boxes in the axial direction of the feeler lever. The coaxial adjusting method of the fluxgate magnetic gradiometer comprises the steps that the fluxgate magnetic gradiometer is vertically fixed to a non-magnetic correction table, fastening screws, at the two ends, used for fixing fluxgates are adjusted repeatedly, alternately and finely until the magnetic flux reading difference value of the two fluxgates is smaller than 1 nT, finally the two fluxgates are permanently fixed in the mounting boxes through silicon gel, and coaxial adjustment is completed. According to the fluxgate magnetic gradiometer, adjustment in two directions cannot interfere, the coaxial adjustment process is effectively simplified, and coaxial adjustment precision is improved.
Description
Technical field
The present invention relates to gradient fluxgate magnetometer, particularly to a kind of same axial adjustment side of gradient fluxgate magnetometer
Method.
Background technology
Flux-gate magnetometer is mainly used in the measurement of faint low frequency magnetostatic field, such as magnetic field of the earth, biological magnetic field and subway
Detection of magnetic embedded part etc..But, when tested magnetic field is very faint, and when ambient noise is larger, useful signal is usually by ring
Border noise floods, and leads to Effect on Detecting to be had a greatly reduced quality.Gradient fluxgate magnetometer can preferably overcome above-mentioned limitation, its advantage
It is the impact that can significantly eliminate external interference signal, even if also can as usual work when occurring in strong magnetic perturbation and magnetic storm.Fluxgate
Magnetic gradiometer is generally used for metallic mineral resources exploration, Electromagnetic Survey of Underground Pipelines, underground archaeology of cultural relic positioning and various faint magnetic
The fields such as field variation monitoring.Due to the vector measurement characteristic of fluxgate, the magnetic-field component change determining direction can be monitored, especially
Be vertical component gradiometry for detected object border determine have very prominent effect.At present, common fluxgate
Magnetic gradiometer is two that the fluxgate of two simple components is arranged on a fixing feeler lever, and the magnetic field measuring respectively at 2 points is strong
Degree, is derived from the Grad of feeler lever axial magnetic field.But, because fluxgate sensor is a vector measurement sensor, right
The direction in tested magnetic field is very sensitive, if the direction of the two of above-mentioned gradient fluxgate magnetometer simple component fluxgates occurs partially
Difference, it will lead to measurement result serious distortion.
Taking China as a example, the vertical component value in magnetic field of the earth probably in 30000nT about it is assumed that gradient fluxgate magnetometer
In the angle of deviation of two fluxgate sensors be 1 °, then the measure error thus brought is：30000 × (1-cos1 °)=4.6
(nT)；And the setting angle error of actually typically fluxgate often reaches 2 ° to 3 ° even more greatly, the measurement thus bringing is by mistake
Difference is very big, therefore when making gradient fluxgate magnetometer, needs the direction of two sensors is accurately coaxially adjusted
Whole, make the setting angle error of two sensors as little as possible, for example：
When error angle is 0.5 °, 30000 × (1-cos0.5 °)=1.1 (nT)；
When error angle is 0.2 °, 30000 × (1-cos0.2 °)=0.18 (nT).
At present, the fluxgate sensor of one end, the magnetic of the other end when making gradient fluxgate magnetometer, are generally first fixed
Open gate sensor, using being flexibly connected, by adjusting the fluxgate sensor being flexibly connected, makes two fluxgate sensors reach
Coaxially.As shown in figure 1, the gradient fluxgate magnetometer mounting box that by feeler lever, is fixed on feeler lever two ends and being placed in mounting box
Single shaft fluxgate sensor group become, described mounting box includes box and lid, fixed installation one in one of mounting box
Single shaft fluxgate sensor, the bottom of the box of another mounting box and with feeler lever adjacent pair side wall on be respectively provided with adjustment spiral shell
Silk hole, single shaft fluxgate sensor is fixed in mounting box by screw.Gradient fluxgate magnetometer is coaxially adjusted
When whole, give two single shaft fluxgate sensor energisings simultaneously, observe its reading, the screw on fine setting box two side makes list
Axis fluxgate sensor is adjusted in the horizontal direction, and the screw of fine setting cartridge bottom makes single shaft fluxgate sensor exist
It is adjusted in vertical direction, after alternately and repeatedly finely tuning, finally realize the same axial adjustment of gradient fluxgate magnetometer, but due to
Only one of single shaft fluxgate sensor is carried out with adjustment both horizontally and vertically, can produce and interfere, and wherein
Vertical direction only side is provided with adjustment screw hole, makes adjustment process complicated and uncertain, and ultimately results in fluxgate magnetic force
The error of gradient former is big.
Content of the invention
The technical problem to be solved is to provide a kind of gradient fluxgate magnetometer, can simplify same axial adjustment
Journey, improves the precision of gradient fluxgate magnetometer.
The present invention is achieved by the following technical solutions：
A kind of gradient fluxgate magnetometer, including feeler lever, mounting box and single shaft fluxgate sensor, described mounting box includes
Cassette body and lid, described feeler lever and mounting box are made by no magnetic aluminium, on a pair of parallel side wall of described cassette body
It is provided with symmetrical adjustment screw hole, described single shaft fluxgate sensor is fixed in mounting box by screw, described installation
Box is separately fixed at the two ends of feeler lever, and a pair of parallel side wall that mounting box is provided with adjustment screw hole is respectively perpendicular to the end of feeler lever
Portion, two mounting boxs at described feeler lever two ends be provided with orthogonal between two pairs of parallel side walls of adjustment screw hole, and two
The sensitive axes of the single shaft fluxgate sensor in mounting box are in be coaxially disposed along the axial direction of feeler lever.
A kind of coaxial method of adjustment of aforementioned gradient fluxgate magnetometer, comprises the steps：
Step 1. chooses the metastable region in earth's magnetic field as the measurement ground placing no magnetic correction station, by fluxgate magnetic force
Gradient former is vertically fixed on no in magnetic correction station, and two single shaft fluxgate sensors are connected with computer, observes from computer
The magnetic flux reading that two single shaft fluxgate sensors record；
Step 2. alternately and repeatedly adjusts the screw on the mounting box at gradient fluxgate magnetometer two ends, makes two installations
Single shaft fluxgate sensor in box moves respectively in two mutually perpendicular directions do so, adjusts and senses to two single shaft fluxgates
The magnetic flux reading difference of device is less than 1nT；
Two single shaft fluxgate sensors are separately fixed at gradient fluxgate magnetometer two ends with Instant cement by step 3.
In mounting box, then so that two single shaft fluxgate sensors is permanently fixed with insulation silica gel, complete the same of gradient fluxgate magnetometer
Axial adjustment.
The beneficial aspects of the present invention are：Adjustment screw hole, two single shaft fluxgates are respectively equipped with two mounting boxs
Sensor adjusts respectively on two mutually perpendicular single directions, and the adjustment of both direction will not interfere with each other, effectively letter
Change with axial adjustment process, improve the precision of same axial adjustment.
Brief description
Fig. 1 is the structural representation of existing gradient fluxgate magnetometer；
Fig. 2 is the structural representation of gradient fluxgate magnetometer of the present invention；
Fig. 3 is the close-up schematic view of gradient fluxgate magnetometer of the present invention；
Fig. 4 is the schematic diagram of the coaxial method of adjustment of gradient fluxgate magnetometer of the present invention.
Wherein：1-JJG-2 no magnetic correction station, 11- fixture, 2- computer, 3- gradient fluxgate magnetometer, 31- single shaft magnetic flux
Door sensor, 32- feeler lever.
Specific embodiment
With reference to specific embodiments and the drawings, the present invention is expanded on further.
As shown in Figures 2 and 3, be gradient fluxgate magnetometer structural representation, including feeler lever, two mounting boxs and two
Individual single shaft fluxgate sensor, described mounting box includes cassette body and lid, and described feeler lever and mounting box are by no magnetic aluminium
Make, a pair of parallel side wall of described cassette body is provided with symmetrical adjustment screw hole, described single shaft fluxgate sensor leads to
Cross screw to be fixed in mounting box, described mounting box is separately fixed at the two ends of feeler lever, mounting box is provided with adjustment screw hole
A pair of parallel side wall be respectively perpendicular to the end of feeler lever, two mounting boxs at described feeler lever two ends are provided with adjustment screw hole
Orthogonal between two pairs of parallel side walls, and the sensitive axes of the single shaft fluxgate sensor in two mounting boxs are along the axial direction of feeler lever
It is in be coaxially disposed.When the gradient fluxgate magnetometer of this structure carries out same axial adjustment, the single shaft fluxgate sensor at its two ends
Only move in a single direction respectively, do not interfere with each other, can effectively simplify the process of same axial adjustment.
As shown in figure 4, being the connection diagram when carrying out same axial adjustment for the gradient fluxgate magnetometer 3.
When gradient fluxgate magnetometer 3 carries out same axial adjustment, employ following equipment：JJG-2 no magnetic correction station 1, electricity
Brain 2 and the gradient fluxgate magnetometer 3 based on single shaft fluxgate sensor technology, described gradient fluxgate magnetometer 3 includes visiting
32, two square mounting boxs of bar and two single shaft fluxgate sensors 31, wherein feeler lever 32 and mounting box are by no magnetic aluminium
Make, mounting box is made up of cassette body and lid.
A kind of coaxial method of adjustment of gradient fluxgate magnetometer 3 specifically includes following steps：
Step 1. chooses the metastable region in earth's magnetic field as the measurement ground placing JJG-2 no magnetic correction station 1, by magnetic flux
The feeler lever 32 of door magnetic gradiometer 3 is vertically fixed on JJG-2 no magnetic correction station 1 by the fixture 11 of JJG-2 no magnetic correction station 1
On, and two single shaft fluxgate sensors 31 are connected with computer 2, two single shaft fluxgate sensors 31 are observed from computer 2
The magnetic flux reading recording；
Step 2. first adjusts the screw of the single shaft fluxgate sensor 31 of one end, makes two single shaft fluxgate sensors
31 magnetic flux reading tends to equal, then adjusts the screw of the single shaft fluxgate sensor 31 of the other end again, makes two
The difference of the magnetic flux reading of single shaft fluxgate sensor 31 reduces further, so alternately and repeatedly adjusts to two single shaft magnetic fluxs
The magnetic flux reading difference of door sensor 31 is less than 1nT；
Two single shaft fluxgate sensors 31 are first separately fixed at 3 liang of gradient fluxgate magnetometer with Instant cement by step 6.
In the mounting box at end, then two single shaft fluxgate sensors 31 are made to be permanently fixed with insulation silica gel, the lid covering mounting box is complete
Become the same axial adjustment of gradient fluxgate magnetometer 3.
Claims (1)
1. the coaxial method of adjustment of a kind of gradient fluxgate magnetometer, described gradient fluxgate magnetometer, including feeler lever, mounting box
With single shaft fluxgate sensor, described mounting box includes cassette body and lid, and described feeler lever and mounting box are by no magnetic aluminium
Make, a pair of parallel side wall of described cassette body is provided with symmetrical adjustment screw hole, described single shaft fluxgate sensor leads to
Cross screw to be fixed in mounting box, described mounting box is separately fixed at the two ends of feeler lever, mounting box is provided with adjustment screw hole
A pair of parallel side wall be respectively perpendicular to the end of feeler lever, two mounting boxs at described feeler lever two ends are provided with adjustment screw hole
Orthogonal between two pairs of parallel side walls, and the sensitive axes of the single shaft fluxgate sensor in two mounting boxs are along the axial direction of feeler lever
It is in be coaxially disposed；It is characterized in that, methods described comprises the steps：
Step 1. chooses the metastable region in earth's magnetic field as the measurement ground placing no magnetic correction station, by fluxgate magnetic gradient
Instrument is vertically fixed on no in magnetic correction station, and two single shaft fluxgate sensors are connected with computer, observes two from computer
The magnetic flux reading that single shaft fluxgate sensor records；
Step 2. alternately and repeatedly adjusts the screw on the mounting box at gradient fluxgate magnetometer two ends, makes in two mounting boxs
Single shaft fluxgate sensor move in two mutually perpendicular directions do so respectively, adjust to two single shaft fluxgate sensors
Magnetic flux reading difference is less than 1nT；
Two single shaft fluxgate sensors are separately fixed at the installation at gradient fluxgate magnetometer two ends by step 3. with Instant cement
In box, then so that two single shaft fluxgate sensors is permanently fixed with insulation silica gel, complete the coaxial tune of gradient fluxgate magnetometer
Whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200464.7A CN103969603B (en) | 2014-05-13 | 2014-05-13 | fluxgate magnetic gradiometer and coaxial adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200464.7A CN103969603B (en) | 2014-05-13 | 2014-05-13 | fluxgate magnetic gradiometer and coaxial adjusting method thereof |
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| Publication Number | Publication Date |
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| CN103969603A CN103969603A (en) | 2014-08-06 |
| CN103969603B true CN103969603B (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439732A (en) * | 1981-05-26 | 1984-03-27 | Unied Scientific Corporation | Electrically balanced fluxgate gradiometers |
| US4623842A (en) * | 1982-08-27 | 1986-11-18 | Her Majesty The Queen In Right Of Canada | Magnetometer array with magnetic field sensors on elongate support |
| US6339328B1 (en) * | 1997-03-10 | 2002-01-15 | The Secretary Of State For Defence | Magnetic gradiometer incorporating global feedback |
| CN201828655U (en) * | 2010-09-21 | 2011-05-11 | 中国船舶重工集团公司第七一○研究所 | Miniature digital fluxgate magnetic sensor |
| CN102645641A (en) * | 2012-04-05 | 2012-08-22 | 上海海碧电子科技有限公司 | Fluxgate sensor with three components on same point |
| CN202903988U (en) * | 2012-11-16 | 2013-04-24 | 天津市泰华科技有限公司 | Triaxial orthogonal fluxgate sensor |
-
2014
- 2014-05-13 CN CN201410200464.7A patent/CN103969603B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439732A (en) * | 1981-05-26 | 1984-03-27 | Unied Scientific Corporation | Electrically balanced fluxgate gradiometers |
| US4623842A (en) * | 1982-08-27 | 1986-11-18 | Her Majesty The Queen In Right Of Canada | Magnetometer array with magnetic field sensors on elongate support |
| US6339328B1 (en) * | 1997-03-10 | 2002-01-15 | The Secretary Of State For Defence | Magnetic gradiometer incorporating global feedback |
| CN201828655U (en) * | 2010-09-21 | 2011-05-11 | 中国船舶重工集团公司第七一○研究所 | Miniature digital fluxgate magnetic sensor |
| CN102645641A (en) * | 2012-04-05 | 2012-08-22 | 上海海碧电子科技有限公司 | Fluxgate sensor with three components on same point |
| CN202903988U (en) * | 2012-11-16 | 2013-04-24 | 天津市泰华科技有限公司 | Triaxial orthogonal fluxgate sensor |
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| CN103969603A (en) | 2014-08-06 |
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Effective date of registration: 20180419 Address after: 210012 Room 303, 3 District C, 10 flower god temple, Yuhuatai District, Nanjing, Jiangsu. Patentee after: Nanjing cloud magnetic Electronics Technology Co., Ltd. Address before: 1550 No. 201306 Shanghai Pudong New Area Lingang New City Harbor Boulevard Patentee before: Shanghai Maritime University |
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