CN107314954A - Small magnetic particle measurer and its measuring method in a kind of fluid - Google Patents
Small magnetic particle measurer and its measuring method in a kind of fluid Download PDFInfo
- Publication number
- CN107314954A CN107314954A CN201710422038.1A CN201710422038A CN107314954A CN 107314954 A CN107314954 A CN 107314954A CN 201710422038 A CN201710422038 A CN 201710422038A CN 107314954 A CN107314954 A CN 107314954A
- Authority
- CN
- China
- Prior art keywords
- sensitive material
- measurement
- fluid
- magnetic particle
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000006249 magnetic particle Substances 0.000 title claims abstract description 30
- 239000012530 fluid Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000005259 measurement Methods 0.000 claims abstract description 38
- 238000004513 sizing Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects thereof, e.g. conductivity or capacity
-
- G01N2015/1024—
Abstract
The invention discloses a kind of measurement apparatus to small magnetic particle magnetic fields in fluid, it includes sensitive material；Insulating cover, it closely wraps up sensitive material；Container is measured, it is hollow structure, and is combined closely with sensitive material, form the hollow cavity that axle center is insulating cover tight sensitive material；Entrance and exit, it is opened in measurement container two ends respectively, and measurement container is entered and left to measure target；Signal coil, it is wound on measurement vessel surface, the signal needed for being obtained from its two ends；Driving source, is connected with sensitive material, and drive signal is applied at sensitive material two ends；Bias coil, it is wound on measurement vessel surface, and applies bias source at its two ends.Sensor and measurement cavity are combined together by the present apparatus, are formed an entirety, on the one hand can be realized the easy of measurement while making the relative distance of target and sensor small as far as possible, improve measurement accuracy.
Description
Technical field
The invention belongs to magnetic sensitive device field, more particularly to small magnetic particle measurer and its survey in a kind of fluid
Amount method.
Background technology
Magnetic molecule is widely used in various fields such as nondestructive inspection, biomagnetic beads, magnetic fluid etc..Therefore it is logical
Crossing can just carry out indirectly measuring and monitoring to the sign of small magnetic particle and measurement to various targets.Many small magnetic particles
Application scenario itself and fluid are often combined to form to the carrier that small magnetic particle is included in a kind of liquid.So developing a kind of energy
It is enough that the highly sensitive test device that small magnetic particle is characterized in liquid is had great practical value.
The content of the invention
The present invention proposes small magnetic particle measurer in a kind of fluid, including：Sensitive material；Insulating cover, its
Closely wrap up the sensitive material；Container is measured, it is hollow structure, and is combined closely with the sensitive material, formed
Axle center is the hollow cavity of insulating cover tight sensitive material；Entrance and exit, it is opened in the measurement container respectively
Two ends, the measurement container is entered and left to measure target；Signal coil, it is wound on the measurement vessel surface, can
Signal needed for being obtained from its two ends；Driving source, is connected with the sensitive material, applies driving letter at the sensitive material two ends
Number；Bias coil, it is wound on the measurement vessel surface, and applies bias source at its two ends.
In the present invention, the sensitive material is magnetic susceptible material, and in changes of magnetic field respective change can occur for its magnetic conductivity.
The invention also provides a kind of small magnetic particle sizing method in fluid, it comprises the following steps：
Step one：Magnetic particle in fluid enters hollow cavity from entrance；
Step 2：Drive signal is applied at the two ends of sensitive material by driving source；
Step 3：Apply bias source on bias coil, produce the magnetic particle in a magnetic field influence fluid, make its signal
Optimize；
Step 4：The signal in magnetic field is obtained at the signal coil two ends of measurement vessel surface
Step 5：Will measurement target discharge from outlet after being measured.
In the present invention, the driving source drives the sensitive material, leads the change of its magnetic conductivity generating period
Cause to produce signal in signal coil.
In the present invention, the signal coil is enclosed in outside measurement cavity, and measurement target is present within measuring coil.Simultaneously
Make measurement target maximumization close to driving sensitive material.
In the present invention, the insulating cover improves the performance of sensitive material by electromagnetic interaction, while to sensitivity
Material plays a protective role, and completely cuts off unfavorable factor.
The beneficial effects of the present invention are：High-precision measurement can be carried out to the small magnetic particle in fluid, signal
Intensity corresponds to the quantity of magnetic particle.Sensor and measurement cavity are combined together by the present apparatus, form an entirety, on the one hand
The easy of measurement can be realized while making the relative distance of target and sensor small as far as possible, measurement accuracy is improved.
Brief description of the drawings
Fig. 1 is the structural representation of small magnetic particle measurer in a kind of fluid of the invention.
Fig. 2 is the side view of small magnetic particle measurer in a kind of fluid of the invention.
Embodiment
With reference to specific examples below and accompanying drawing, the present invention is described in further detail.The process of the implementation present invention,
Condition, experimental method etc., are the universal knowledege and common knowledge of this area, this hair in addition to the following content specially referred to
It is bright that content is not particularly limited.
As depicted in figs. 1 and 2, small magnetic particle measurer in fluid proposed by the present invention, including：Sensitive material 1；Absolutely
Edge coating 2, it closely wraps up sensitive material 1；Container 3 is measured, it is hollow structure, and closely tied with sensitive material 1
Close, form the hollow cavity 9 that axle center is the tight sensitive material 1 of insulating cover 2；Entrance 4 and outlet 5, it is opened in respectively
The two ends of container 3 are measured, container 3 is measured to measure entering and leaving for target；Signal coil 6, it is wound on the measurement table of container 3
Face, the signal 7 needed for being obtained from its two ends；Driving source 8, is connected with sensitive material 1, applies at the two ends of sensitive material 1 and drives
Signal；Bias coil 10, it is wound on measurement container 3 surface, and applies bias source 11 at its two ends.
Based on small magnetic particle measurer in upper fluid, the invention also provides small magnetic particle is surveyed in a kind of fluid
Amount method, it comprises the following steps：
Step one：Magnetic particle in fluid enters hollow cavity 9 from entrance 4；
Step 2：Drive signal is applied at the two ends of sensitive material 1 by driving source 8；
Step 3：Apply bias source 11 on bias coil 10 and produce magnetic field；
Step 4：The signal in magnetic field is obtained at the two ends of signal coil 6 on measurement container 3 surface；
Step 5：Will measurement target discharge from outlet 5 after being measured.
In the present invention, insulating cover 2 merges to form a hollow cavity at two ends and hollow measurement chamber wall.
In the present invention, sensitive material core parcel is allowed to completely cut off with the inside of hollow cavity 9 by insulating cover 2, so that a side
Sensitivity is improved by electromagnetic interaction, next protects it from the pollution of external condition and environment.
In the present invention, signal coil 6 is wound on the outer surface of hollow cavity 9, and itself and sensitive material 1 just constitute sensor.
The present invention applies an alternating current drive signal, this drive signal makes quick in measurement at the two ends of sensitive material 1
Feel the magnetic field that an alternation is produced in material 1, this magnetic field can make the magnetic conductivity in material produce periodic change.Work as sensitivity
When material 1 is the soft magnetic materials with higher magnetic permcability, this periodically variable magnetic conductivity will be influenceed by externally-applied magnetic field
Produce change.A corresponding signal will be sensed in the signal coil 6 being wound on outside cavity, the intensity of this signal and additional
Magnetic field be in one-to-one relation.
Sensor and target cavity are designed to an entirety in measurement apparatus of the present invention.Small magnetic during measurement in fluid
Particle just flows into cavity by being opened in the entrance 4 of chamber wall one end, the magnetic direction that the small magnetic particle in fluid is produced be with
Machine, producing a bias magnetic field by bias coil 10 makes magnetic particle magnetic fields be displaced to a direction, if while magnetic particle
Then its magnetic field produced is set to become larger by bias field with superparamagnetism.The global magnetic field that magnetic particle is produced is to sensitive material
1 magnetic conductivity produces the signal for changing and then causing the two ends of signal coil 6 to obtain and produces change.Can by measuring this signal
To be characterized to small magnetic particle.It is measured rear target and completion measurement is excluded at outlet 5.
The protection content of the present invention is not limited to above example.Under the spirit and scope without departing substantially from inventive concept, this
Art personnel it is conceivable that change and advantage be all included in the present invention, and using appended claims as protect
Protect scope.
Claims (4)
1. small magnetic particle measurer in a kind of fluid, it is characterised in that including：
Sensitive material (1)；
Insulating cover (2), it closely wraps up the sensitive material (1)；
Container (3) is measured, it is hollow structure, and is combined closely with the sensitive material (1), form axle center and covered for insulation
The hollow cavity (9) of layer (2) tight sensitive material (1)；
Entrance (4) and outlet (5), it is opened in described measurement container (3) two ends, institute is entered and left to measure target respectively
State measurement container (3)；
Signal coil (6), it is wound on described measurement container (3) surface, the signal (7) needed for being obtained from its two ends；
Driving source (8), is connected with the sensitive material (1), and drive signal is applied at the sensitive material (1) two ends；
Bias coil (10), it is wound on described measurement container (3) surface, and applies bias source (11) at its two ends.
2. small magnetic particle measurer in fluid as claimed in claim 1, it is characterised in that the sensitive material (1) is
Magnetic susceptible material.
3. a kind of small magnetic particle sizing method in fluid, it is characterised in that use measurement apparatus as claimed in claim 1,
Comprise the following steps：
Step one：Magnetic particle in fluid enters hollow cavity (9) from entrance (4)；
Step 2：Drive signal is applied at the two ends of sensitive material (1) by driving source (8)；
Step 3：Apply bias source (11) on bias coil (10) and produce magnetic field；
Step 4：The signal in magnetic field is obtained at signal coil (6) two ends on measurement container (3) surface；
Step 5：Will measurement target discharge from outlet (5) after being measured.
4. small magnetic particle sizing method in fluid as claimed in claim 3, it is characterised in that driving source (8) driving
The sensitive material (1), makes the change of its magnetic conductivity generating period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710422038.1A CN107314954B (en) | 2017-06-07 | 2017-06-07 | Device and method for measuring tiny magnetic particles in fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710422038.1A CN107314954B (en) | 2017-06-07 | 2017-06-07 | Device and method for measuring tiny magnetic particles in fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107314954A true CN107314954A (en) | 2017-11-03 |
| CN107314954B CN107314954B (en) | 2021-11-19 |
Family
ID=60184029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710422038.1A Active CN107314954B (en) | 2017-06-07 | 2017-06-07 | Device and method for measuring tiny magnetic particles in fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107314954B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5954955A (en) * | 1982-09-22 | 1984-03-29 | Daido Steel Co Ltd | Measurment of amount of magnetic particle in fluid |
| US4686469A (en) * | 1985-08-12 | 1987-08-11 | Tribometrics, Inc. | Method and device for measuring magnetic particles in a fluid |
| CN102323189A (en) * | 2011-05-27 | 2012-01-18 | 张洪朋 | Inductive wear particle monitoring device and measuring unit thereof |
| CN104603611A (en) * | 2012-09-04 | 2015-05-06 | 皇家飞利浦有限公司 | A sensor device and a method of sampling |
| CN105784570A (en) * | 2016-04-21 | 2016-07-20 | 大连海事大学 | Online particle detection device and method based on microfluidic chip |
| CN106546931A (en) * | 2016-10-14 | 2017-03-29 | 华东师范大学 | A kind of miniature non-diagonal giant magnetoresistance effect sensing element |
-
2017
- 2017-06-07 CN CN201710422038.1A patent/CN107314954B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5954955A (en) * | 1982-09-22 | 1984-03-29 | Daido Steel Co Ltd | Measurment of amount of magnetic particle in fluid |
| US4686469A (en) * | 1985-08-12 | 1987-08-11 | Tribometrics, Inc. | Method and device for measuring magnetic particles in a fluid |
| CN102323189A (en) * | 2011-05-27 | 2012-01-18 | 张洪朋 | Inductive wear particle monitoring device and measuring unit thereof |
| CN104603611A (en) * | 2012-09-04 | 2015-05-06 | 皇家飞利浦有限公司 | A sensor device and a method of sampling |
| CN105784570A (en) * | 2016-04-21 | 2016-07-20 | 大连海事大学 | Online particle detection device and method based on microfluidic chip |
| CN106546931A (en) * | 2016-10-14 | 2017-03-29 | 华东师范大学 | A kind of miniature non-diagonal giant magnetoresistance effect sensing element |
Non-Patent Citations (2)
| Title |
|---|
| 张清: "新型巨磁阻抗传感器特性研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 张红燕: "基于磁性微粒的巨磁阻抗生物传感器的制备研究", 《中国优秀硕士学位论文全文数据库》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107314954B (en) | 2021-11-19 |
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