CN107462846A - Weak magnetic field testing device and preparation method thereof - Google Patents
Weak magnetic field testing device and preparation method thereof Download PDFInfo
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- CN107462846A CN107462846A CN201710602702.0A CN201710602702A CN107462846A CN 107462846 A CN107462846 A CN 107462846A CN 201710602702 A CN201710602702 A CN 201710602702A CN 107462846 A CN107462846 A CN 107462846A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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Abstract
The embodiment of the invention discloses a kind of weak magnetic field testing device, the device includes printed circuit board (PCB), the printed circuit board (PCB) is provided with low-intensity magnetic field sensor, wherein, the weak magnetic field testing device also includes magnetic focusing amplifier, and the magnetic focusing amplifier is fixedly connected with the printed circuit board (PCB), and the magnetic focusing amplifier includes focus terminal, the focus terminal is tapered, and the cone of the focus terminal is in contact with the magnetic susceptibility point of the low-intensity magnetic field sensor.Weak magnetic field testing device disclosed in the embodiment of the present invention, realize and further solve the problems, such as low-intensity magnetic field sensor background noise, equipment receiving sensitivity, by the technology of magnetic focusing amplifier and sensor array, improve the collection effect of small and weak magnetic signal.
Description
Technical field
The present invention relates to weak magnetic field testing technical field, more particularly to a kind of weak magnetic field testing device and preparation method thereof.
Background technology
In magnetic field detection technology field, low-intensity magnetic field, high-intensity magnetic field and very high-intensity magnetic field can be substantially divided into from magnetic field intensity angle
Three major types, wherein the detection technique on low-intensity magnetic field largely represents national magnetic field technique development level.In science
Research, national defense construction, industrial production, daily life field, the measurement of low-intensity magnetic field usually play decisive role, are surveyed as one kind
Amount means, weak magnetic survey technology play more and more important effect in association area.The development and application of weak magnetic field testing technology
As people it is closely deeply concerned the problem of one of.The field of detection and the application of low-intensity magnetic field is quite varied.Such as：The detection of low-intensity magnetic field
Technology is usually used in earth magnetism routine and earth tremor detection；Navigate magnetic magnetic survey and the magnetic-field measurement of space technology, what is used is all
Weak magnetic field technology；The demagnetization of naval vessels, the guidance of torpedo and satellite ranging etc. are required for using weak magnetic field technology in military affairs；It is high-precision
The magnetic measurement apparatus of degree is the capital equipment of ground magnetic mine locating, but influence of the environmental magnetic field to these instruments is very big, is using instrument
, it is necessary to be detected to surrounding environment magnetic field before device；Weak magnetic technology can also be applied to earth magnetism satellite, lunar magnetic field and to gold
The detection in the outer space magnetic field such as star, Mercury, the research to celestial body magnetic field have great significance；Modern weak magnetic technology is in bioengineering
It is even more to have important application with medicine equipment aspect, such as：Nuclear magnetic resonance CT, lung magnetic diagnostic equipment, stomach magnetic diagnostic equipment etc..Weak magnetic technology
It is a focus of current new and high technology, its development prospect is wide.
In weak magnetic field testing technology, sensor is the basis of signal acquisition testing.With the development of magnetic sensor technologies,
Magnetic Sensor sensitivity more and more higher, background noise are less and less.The sensor main for being currently used in small and weak magnetic field detection wants thoughts
Answer coil, Hall element, anisotropy magnetosensitive resistance (Anisotropic Magnetoresistance, AMR), giant magnetoresistance
(Giant Magnetoresistance, GMR), fluxgate magnetic core and tunnel mistor (Tunnel
Magnetoresistance, TMR) etc..Table 1 below contrasts for the technical parameter of various sensors：
The magnetic sensor technologies parameter of table 1
Induction coil has the characteristics that wide range, high accuracy, low manufacture cost, is applied in EDDY CURRENT, Magnetic Flux Leakage Inspecting
It is very universal, but its measurement be magnetic induction intensity rate of change, it is necessary to be in the magnetic field of change or moved just in magnetic field
It can work, it is impossible to static and slowly varying magnetic field is detected, it is low to the detection sensitivity of low-frequency alternating.Hall sensor can be direct
Measure the change of field strength values；Also there is good responding ability in low frequency, measurable 10-7~10T stationary magnetic field,
Also measurable frequency 10Hz~100MHz, magnetic induction intensity 5T alternating magnetic field, and pulse duration are tens microseconds
Pulsed magnetic field, but its power consumption is big, poor linearity.Although AMR element remolding sensitivity Hall element is much higher, its range of linearity
It is narrow；Meanwhile the Magnetic Sensor using AMR as sensing element needs to set Set/Reset coils to carry out presetting/resetting operation to it,
Manufacturing process is more complicated, and loop construction also increases power consumption while being arranged on increase size.GMR element has compared with Hall element
Higher sensitivity, but its range of linearity is smaller.TMR elements have more preferable temperature stability, higher relative to Hall element
Sensitivity, lower power consumption, the more preferable linearity, it is not necessary to extra magnetism gathering rings structure；Have relative to AMR element more preferable
Temperature stability, higher sensitivity, the broader range of linearity, it is not necessary to extra Set/Reset loop constructions；Its is relative
There is more preferable temperature stability, higher sensitivity, lower power consumption, the broader range of linearity in GMR element.Referring to Fig. 1,
It is TMR sensor background noise curve.It can be seen that background noise Ni low frequency 1/f noises areHigh frequency
White noise isHigh sensitivity reaches 300mV/V/Oe.Therefore, TMR Magnetic Sensors have ultralow work(
Consumption, small size, high sensitivity, bottom are made an uproar bottom, wide working range, high-resolution and preferably temperature stability.
But because Magnetic Sensor still can have the problem of background noise, equipment receiving sensitivity, also can finally it influence
Testing result.
The content of the invention
The embodiment of the present invention provides weak magnetic field testing device and preparation method thereof, for solution in the prior art, due to
The reason for background noise of Magnetic Sensor, equipment receiving sensitivity, and cause the imperfect problem of Detection results.
On the one hand, the embodiment of the present invention provides a kind of weak magnetic field testing device, including including printed circuit board (PCB), the printing
Circuit board is provided with low-intensity magnetic field sensor, it is characterised in that the weak magnetic field testing device also includes magnetic focusing amplifier, described
Magnetic focusing amplifier is fixedly connected with the printed circuit board (PCB), and the magnetic focusing amplifier includes focus terminal, and the focus terminal is in
Taper, the cone of the focus terminal are in contact with the magnetic susceptibility point of the low-intensity magnetic field sensor.
In one of the embodiments, the magnetic focusing amplifier is fixed with the printed circuit board (PCB) by adjustable screw
Connect, assembling through hole is offered on the printed circuit board (PCB), the size of the assembling through hole is more than the chi of the adjustable screw
Very little, the magnetic focusing amplifier is provided with the fitting surface that is fitted with the printed circuit board (PCB), the fitting surface be provided with it is described
The corresponding assembling counterbore of through hole is assembled, elastomeric pad is provided between the magnetic focusing amplifier and the printed circuit board (PCB).
In one of the embodiments, the quantity of the assembling through hole is 2, and the assembling through hole is rectangle, 2 institutes
State assembling through hole to arrange in line with the magnetic susceptibility point, the long side of the assembling through hole is parallel to the straight line.
In one of the embodiments, the low-intensity magnetic field sensor is TMR Magnetic Sensors, the material of the magnetic focusing amplifier
Expect that for fe-Ni soft magnetic alloy, the magnetic focusing amplifier be in pyramid.
In one of the embodiments, filtering modulate circuit, programmable automation controller are also included on the printed circuit board (PCB)
Circuit, adc data acquisition module and data analysis and processing module；
The filtering modulate circuit is connected to the output end of the low-intensity magnetic field sensor, and the filtering modulate circuit is used for pair
The detection signal of the low-intensity magnetic field sensor collection is filtered conditioning, obtains filtering signal；
The Programmable Gain Amplifier Circuit is connected to the output end of the filtering modulate circuit, and the programmable-gain is put
Big circuit is used to enter the signal amplitude of the filtering signal Mobile state adjustment, is adjusted signal；
The adc data acquisition module is connected with the Programmable Gain Amplifier Circuit, the adc data acquisition module
For being changed to the adjustment signal, change data is obtained；
The Data Analysis Services module is connected to the output end of the adc data acquisition module, at the data analysis
Reason module is used to analyze and process the change data, obtains detecting data.
On the other hand, the embodiment of the present invention additionally provides a kind of preparation method of weak magnetic field testing device, the preparation side
Method is used to prepare above-mentioned weak magnetic field testing device, and the preparation method includes：
Obtain the fixed position of the magnetic susceptibility point on the printed circuit board；
According to the fixed position, obtain the vias position of the assembling through hole and make the assembling through hole；
According to the fixed position and the position of opening, the counterbore perforate of the assembling counterbore is obtained in the fitting surface
Position simultaneously makes the assembling counterbore；
The printed circuit board (PCB) and the magnetic focusing amplifier, the printed circuit board (PCB) are fixed using the adjustable screw
The elastomeric pad is equipped with the magnetic focusing amplifier；
The relative position of the printed circuit board (PCB) and the magnetic focusing amplifier is adjusted by the adjustable screw, makes institute
The cone for stating focus terminal is in contact with the magnetic susceptibility point；
The calibration data of the weak magnetic field testing device is obtained, the calibration data is write into the Data Analysis Services mould
Block, the calibration data are used to carry out compensation data to the change data.
In one of the embodiments, the fixed position of the magnetic susceptibility point on the printed circuit board is obtained described
The step of before, in addition to：
Die sinking casts the magnetic focusing amplifier.
Weak magnetic field testing device provided in an embodiment of the present invention, including printed circuit board (PCB), the printed circuit board (PCB) are provided with
Low-intensity magnetic field sensor, it is characterised in that the weak magnetic field testing device also includes magnetic focusing amplifier, the magnetic focusing amplifier
It is fixedly connected with the printed circuit board (PCB), the magnetic focusing amplifier includes focus terminal, and the focus terminal is tapered, the focusing
The cone at end is in contact with the magnetic susceptibility point of the low-intensity magnetic field sensor.Hereby it is achieved that further solves low-intensity magnetic field sensor
The problem of background noise, equipment receiving sensitivity, by the technology of magnetic focusing amplifier and sensor array, improve small and weak magnetic letter
Number collection effect.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
The accompanying drawing of example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is TMR sensor background noise curve；
Fig. 2 is the structural representation of the first embodiment of weak magnetic field testing device of the present invention；
Fig. 3 is the schematic diagram in kind before the assembling of the first embodiment of weak magnetic field testing device of the present invention；
Fig. 4 is the schematic diagram in kind after the assembling of the first embodiment of weak magnetic field testing device of the present invention；
Fig. 5 is the structural representation of the magnetic focusing amplifier of the first embodiment of weak magnetic field testing device of the present invention；
Fig. 6 is the structural representation of the second embodiment of weak magnetic field testing device of the present invention；
Fig. 7 is the schematic flow sheet of weak magnetic field testing device preparation method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
First embodiment
As shown in Fig. 2 it is the structural representation of the first embodiment of weak magnetic field testing device of the present invention.The weak magnetic field testing
Device includes printed circuit board (PCB) 1, and the printed circuit board (PCB) 1 is provided with low-intensity magnetic field sensor 11, wherein, the weak magnetic field testing dress
Putting also includes magnetic focusing amplifier 2, and the magnetic focusing amplifier 2 is fixedly connected with the printed circuit board (PCB) 1, and the magnetic focusing is put
Big device 2 includes focus terminal 21, and the focus terminal 21 is tapered, the cone of the focus terminal 21 and the low-intensity magnetic field sensor 11
Magnetic susceptibility point is in contact.
It is known that low-intensity magnetic field sensor 11 has magnetic susceptibility point, can obtain according to the specification of sensor or after testing.
In embodiments of the present invention, the cone of the focus terminal 21 of magnetic focusing amplifier 2 is pointed into magnetic susceptibility point, can reach to utilize has
The magnetic focusing amplifier 2 of focus terminal 21 is the effect of the amplified signal of low-intensity magnetic field sensor 11.
Further, the magnetic focusing amplifier 2 is fixedly connected with the printed circuit board (PCB) 1 by adjustable screw, institute
To state and assembling through hole 12 is offered on printed circuit board (PCB) 1, the size of the assembling through hole 12 is more than the size of the adjustable screw,
The magnetic focusing amplifier 2 is provided with the fitting surface 22 to be fitted with the printed circuit board (PCB) 1, and the fitting surface 22 is provided with and institute
The corresponding assembling counterbore 23 of assembling through hole 12 is stated, elasticity is provided between the magnetic focusing amplifier 2 and the printed circuit board (PCB) 1
Pad 3.
In embodiments of the present invention, on the one hand, the size due to assembling through hole 12 is more than the size of adjustable screw, therefore
Can left and right, the relative position of front and rear adjustment magnetic focusing amplifier 2 and printed circuit board (PCB) 1, on the other hand, because magnetic focusing is amplified
Elastomeric pad 3 is provided between device 2 and printed circuit board (PCB) 1, the elastomeric pad 3 can select silica gel piece, the two of adjustable screw
A silica gel piece is respectively placed in side, can adjust the relative position of magnetic focusing amplifier 2 and printed circuit board (PCB) 1 up and down.Therefore, according to
The device of the embodiment of the present invention, it is possible to achieve magnetic focusing amplifier 2 and printed circuit board (PCB) 1 or so, front and rear, upper and lower several directions
Fine setting, for ensureing that the cone of focus terminal 21 is in contact with the magnetic susceptibility point of low-intensity magnetic field sensor 11.In addition, assembling counterbore 23 is
Screwed hole, it is adapted to adjustable screw, assembling counterbore 23 rather than through hole is set in fitting surface 22, magnetic focusing can be avoided damage to
The magnetic focusing effect of amplifier 2.
Further, the quantity of the assembling through hole 12 is 2, and the assembling through hole 12 is rectangle, 2 assemblings
Through hole 12 arranges in line with the magnetic susceptibility point, and the long side of the assembling through hole 12 is parallel to the straight line.
In embodiments of the present invention, referring to Fig. 3 and Fig. 4, Fig. 3 is the first embodiment of weak magnetic field testing device of the present invention
Schematic diagram in kind before assembling, Fig. 4 are the schematic diagrames in kind after the assembling of the first embodiment of weak magnetic field testing device of the present invention.
The quantity for assembling through hole 12 is set to 2, can preferably fix magnetic focusing amplifier 2, and it is rectangular assemble through hole 12, one
Aspect reduces the machining accuracy of the assembling counterbore 23 of assembly difficulty and magnetic focusing amplifier 2, on the other hand can further protect
The cone of card focus terminal 21 is in contact with the magnetic susceptibility point of low-intensity magnetic field sensor 11.
Further, the low-intensity magnetic field sensor 11 is TMR Magnetic Sensors, and the material of the magnetic focusing amplifier 2 is iron
Nickel magnetically soft alloy, the magnetic focusing amplifier 2 are in pyramid.
In embodiments of the present invention, there is TMR Magnetic Sensors ultralow power consumption, small size, high sensitivity, bottom to make an uproar bottom, big
Working range, high-resolution and preferably temperature stability.Therefore the present invention is carried out using TMR Magnetic Sensors to weak magnetic field signal
Collection and detection.In addition, fe-Ni soft magnetic alloy can realize magnetically focused effect, surrounding magnetic induction line is focused on together, realized
The effect of the passive amplification in magnetic field.
Understood through emulation and theory analysis, in addition to the volume and weight of soft magnetism, influence the main of soft magnetism magnetic focusing effect
It is the form of soft magnetism, referring to Fig. 5, for the structure of the magnetic focusing amplifier 2 of the first embodiment of weak magnetic field testing device of the present invention
Schematic diagram, soft magnetism is processed into 5 kinds of models shown in Fig. 5 and carries out experimental test, soft magnetism focus point is directed at Magnetic Sensor, alternation
Under sinusoidal magnetic field environment, the electric signal size for the Magnetic Sensor conversion tested with oscillograph after increase soft magnetism.It is demonstrated experimentally that magnetic gathers
Small and weak magnetic field can be amplified decades of times by burnt technology, that is to say, that the distance of magnetic detection can be expanded into more than 1 times in theory, not
The alternating magnetic field signal gathered using the Magnetic Sensor of magnetic focusing amplifier 2, amplitude about 20mV, and increase magnetic focusing amplifier 2
The alternating magnetic field signal gathered afterwards, amplitude about 200mV.
Found through overtesting, the soft magnetism magnetic focusing effect of Fig. 5 the second from left shapes is best, preferably can gather the space magnetic line of force
Jiao arrives Magnetic Sensor, the amplification in magnetic field is realized, shown in final products Fig. 4.
Weak magnetic field testing device provided in an embodiment of the present invention, including including printed circuit board (PCB) 1, the printed circuit board (PCB) 1
It is provided with low-intensity magnetic field sensor 11, it is characterised in that the weak magnetic field testing device also includes magnetic focusing amplifier 2, the magnetic
Focus amplifier 2 is fixedly connected with the printed circuit board (PCB) 1, and the magnetic focusing amplifier 2 includes focus terminal 21, the focus terminal
21 is tapered, and the cone of the focus terminal 21 is in contact with the magnetic susceptibility point of the low-intensity magnetic field sensor 11.Hereby it is achieved that enter
One step solves the problems, such as the background noise of low-intensity magnetic field sensor 11, equipment receiving sensitivity, passes through magnetic focusing amplifier 2 and sensor
The technology of array, improve the collection effect of small and weak magnetic signal.
Second embodiment
As shown in fig. 6, it is the structural representation of the second embodiment of weak magnetic field testing device of the present invention.The present embodiment it is weak
Detector for magnetic field is the further improvement based on first embodiment, also include on its printed circuit board (PCB) 1 filtering modulate circuit 13,
Programmable Gain Amplifier Circuit 14, adc data acquisition module 15 and data analysis and processing module 16：
The filtering modulate circuit 13 is connected to the output end of the low-intensity magnetic field sensor 11, the filtering modulate circuit 13
Detection signal for being gathered to the low-intensity magnetic field sensor 11 is filtered conditioning, obtains filtering signal；
The Programmable Gain Amplifier Circuit 14 is connected to the output end of the filtering modulate circuit 13, the programmable increasing
Beneficial amplifying circuit 14 is used to enter the signal amplitude of the filtering signal Mobile state adjustment, is adjusted signal；
The adc data acquisition module 15 is connected with the Programmable Gain Amplifier Circuit 14, the adc data collection
Module 15 is used to change the adjustment signal, obtains change data；
The Data Analysis Services module 16 is connected to the output end of the adc data acquisition module 15, the data point
Analysis processing module 16 is used to analyze and process the change data, obtains detecting data.
Low-intensity magnetic field magnetic field signal acquisition testing system realizes that filtering out for high-frequency noise increases with more than 80dB using analog circuit
The amplification of benefit, inherently a kind of silent, passive collection of magnetic signal acquisition device, does not launch any signal.Filter modulate circuit
Three-level amplifier has been used to be filtered conditioning to signal；Enter Mobile state tune to signal amplitude using Programmable Gain Amplifier Circuit
It is whole；Data are acquired using 16 ADC；The data volume of ADC collections is bigger, and data analysis component is using at DSP
Reason.
In order to solve the problems such as magnetic signal is small, ambient noise is complicated, using magnetic focusing technology, while array acquisition is used for reference
Advantage, the influence of Magnetic Sensor background noise is greatly reduced, improve the sensitivity of magnetic signal acquisition.The magnetic that the present invention researches and develops
Focusing technology, by fe-Ni soft magnetic alloy by small and weak magnetic induction line focus on together, by space magnetic induction intensity it is passive amplification 10 times,
The sensitivity of single collection sensor is greatly improved, time detection range is improved, reduces the influence of background noise.
Focused on together using the small and weak magnetic induction line of fe-Ni soft magnetic alloy magnetic focusing technology, put space magnetic induction intensity is passive
It is big 10 times, the sensitivity of single collection sensor is greatly improved, magnetic detection distance is improved, reduces the influence of background noise, greatly
The big sensitivity for improving weak magnetic field testing technology.
The embodiment of the weak magnetic field testing device of the present invention is discussed in detail above.Above-mentioned weak magnetic is will correspond to below
The preparation method of field detection means is further elaborated.
3rd embodiment
As shown in fig. 7, being the schematic flow sheet of weak magnetic field testing device preparation method of the present invention, the preparation method is used to make
The weak magnetic field testing device of standby above-described embodiment, the preparation method include：
Step 101, the fixed position of the magnetic susceptibility point on the printed circuit board is obtained.
In this step, in order to realize commercialization, need to solve the problems such as soft magnetism processing, fixation, homogeneity of product, due to magnetic
Sensor has a magnetic susceptibility point in itself, by the cone aligned magnetic sensitive spot of magnetic conduction wedge angle, the i.e. focus terminal of magnetic focusing amplifier
.Ensure the uniformity of soft magnetism processing technology first, secondly ensure the uniformity of installation technique for fixing, finally by soft magnetism, magnetic
Sensor, acquisition system carry out parametric calibration test, writing system calibration parameter as overall.
In embodiments of the present invention, in the fixed position of the magnetic susceptibility point on the printed circuit board of obtaining
Before step, in addition to：
Die sinking casts the magnetic focusing amplifier.
Wherein, soft magnetism processing is changed to mold casting technique by cutting technique, and reduction processing technology is brought not true as far as possible
It is qualitative.
Step 102, according to the fixed position, obtain the vias position of the assembling through hole and make the assembling
Through hole.
In this step, referring to Fig. 2,2 long and narrow assembling through holes are opened up on a printed circuit, soft magnetism is it is possible thereby to reality
Existing position is front and rear to be adjusted.
Step 103, according to the fixed position and the position of opening, the assembling counterbore is obtained in the fitting surface
Counterbore position of opening simultaneously makes the assembling counterbore.
In this step, in the bottom open screw hole of magnetic focusing amplifier, that is, counterbore is assembled, its size and adjustable screw
Match, and the size of its aperture ratio assembling through hole is small, it is possible to achieve soft magnetism position or so adjusts.
Step 104, the printed circuit board (PCB) and the magnetic focusing amplifier, the print are fixed using the adjustable screw
Printed circuit board and the magnetic focusing amplifier are equipped with the elastomeric pad.
In this step, pcb board and the silica gel pad of soft magnetism centre increase certain degree of hardness, are carried out soft by screw worked itself loose tightness
Magnetic adjusts up and down.
Step 105, the relative of the printed circuit board (PCB) and the magnetic focusing amplifier is adjusted by the adjustable screw
Position, the cone of the focus terminal is set to be in contact with the magnetic susceptibility point.
Step 106, the calibration data of the weak magnetic field testing device is obtained, the calibration data is write into the data point
Processing module is analysed, the calibration data is used to carry out compensation data to the change data.
After printed circuit board (PCB) and magnetic focusing amplifier fix, calibrated using whole acquisition module as overall,
By calibration result writing system calibration parameter, each acquisition module carries out compensation data according to calibration parameter in real work.
Each technical characteristic of foregoing embodiment can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered as.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art can readily occur in change or replacement in the technical scope of present disclosure, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (7)
1. a kind of weak magnetic field testing device, including printed circuit board (PCB), the printed circuit board (PCB) is provided with low-intensity magnetic field sensor, and it is special
Sign is that the weak magnetic field testing device also includes magnetic focusing amplifier, the magnetic focusing amplifier and the printed circuit board (PCB)
Be fixedly connected, the magnetic focusing amplifier includes focus terminal, and the focus terminal is tapered, the cone of the focus terminal with it is described weak
The magnetic susceptibility point of magnetic field sensor is in contact.
2. weak magnetic field testing device according to claim 1, it is characterised in that the magnetic focusing amplifier and the printing
Circuit board is fixedly connected by adjustable screw, and assembling through hole, the chi of the assembling through hole are offered on the printed circuit board (PCB)
The very little size more than the adjustable screw, the magnetic focusing amplifier are provided with the assembling to be fitted with the printed circuit board (PCB)
Face, the fitting surface are provided with the assembling counterbore corresponding with the assembling through hole, the magnetic focusing amplifier and the printing
Elastomeric pad is provided between circuit board.
3. weak magnetic field testing device according to claim 2, it is characterised in that the quantity of the assembling through hole is 2, institute
State assembling through hole to be rectangle, 2 assembling through holes arrange in line with the magnetic susceptibility point, the length of the assembling through hole
While parallel to the straight line.
4. weak magnetic field testing device according to claim 1, it is characterised in that the low-intensity magnetic field sensor passes for TMR magnetic
Sensor, the material of the magnetic focusing amplifier is fe-Ni soft magnetic alloy, and the magnetic focusing amplifier is in pyramid.
5. according to the weak magnetic field testing device described in claim any one of 1-4, it is characterised in that on the printed circuit board (PCB) also
Including filtering modulate circuit, Programmable Gain Amplifier Circuit, adc data acquisition module and data analysis and processing module；
The filtering modulate circuit is connected to the output end of the low-intensity magnetic field sensor, and the filtering modulate circuit is used for described
The detection signal of low-intensity magnetic field sensor collection is filtered conditioning, obtains filtering signal；
The Programmable Gain Amplifier Circuit is connected to the output end of the filtering modulate circuit, the programmable automation controller electricity
Road is used to enter the signal amplitude of the filtering signal Mobile state adjustment, is adjusted signal；
The adc data acquisition module is connected with the Programmable Gain Amplifier Circuit, and the adc data acquisition module is used for
The adjustment signal is changed, obtains change data；
The Data Analysis Services module is connected to the output end of the adc data acquisition module, the Data Analysis Services mould
Block is used to analyze and process the change data, obtains detecting data.
6. a kind of preparation method of weak magnetic field testing device, it is characterised in that the preparation method is used to prepare claim 1-5
Weak magnetic field testing device described in any one, the preparation method include：
Obtain the fixed position of the magnetic susceptibility point on the printed circuit board；
According to the fixed position, obtain the vias position of the assembling through hole and make the assembling through hole；
According to the fixed position and the position of opening, the counterbore position of opening of the assembling counterbore is obtained in the fitting surface
And make the assembling counterbore；
The printed circuit board (PCB) and the magnetic focusing amplifier, the printed circuit board (PCB) and institute are fixed using the adjustable screw
State magnetic focusing amplifier and be equipped with the elastomeric pad；
The relative position of the printed circuit board (PCB) and the magnetic focusing amplifier is adjusted by the adjustable screw, is made described poly-
The cone at burnt end is in contact with the magnetic susceptibility point；
The calibration data of the weak magnetic field testing device is obtained, the calibration data is write into the Data Analysis Services module,
The calibration data is used to carry out compensation data to the change data.
7. preparation method according to claim 6, it is characterised in that obtain the magnetic susceptibility point in the printing described
Before the step of fixed position on circuit board, in addition to：
Die sinking casts the magnetic focusing amplifier.
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| CN201710602702.0A CN107462846A (en) | 2017-07-21 | 2017-07-21 | Weak magnetic field testing device and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001817A (en) * | 2018-05-07 | 2018-12-14 | 哈尔滨工程大学 | A kind of safety door based on tunnel magneto resistance sensor |
| CN110940907A (en) * | 2018-09-24 | 2020-03-31 | 台湾积体电路制造股份有限公司 | Semiconductor wafer test system |
| GB2602390A (en) * | 2020-12-22 | 2022-06-29 | Showa Denko Kk | Magnetic sensor |
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| CN109001817A (en) * | 2018-05-07 | 2018-12-14 | 哈尔滨工程大学 | A kind of safety door based on tunnel magneto resistance sensor |
| CN110940907A (en) * | 2018-09-24 | 2020-03-31 | 台湾积体电路制造股份有限公司 | Semiconductor wafer test system |
| GB2602390A (en) * | 2020-12-22 | 2022-06-29 | Showa Denko Kk | Magnetic sensor |
| US11719767B2 (en) | 2020-12-22 | 2023-08-08 | Showa Denko K.K. | Magnetic sensor |
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