CN107478543B - Centrifugal density measuring equipment and method based on diamagnetic suspension theory - Google Patents
Centrifugal density measuring equipment and method based on diamagnetic suspension theory Download PDFInfo
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- CN107478543B CN107478543B CN201710553327.5A CN201710553327A CN107478543B CN 107478543 B CN107478543 B CN 107478543B CN 201710553327 A CN201710553327 A CN 201710553327A CN 107478543 B CN107478543 B CN 107478543B
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- 230000005292 diamagnetic effect Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000725 suspension Substances 0.000 title claims abstract description 15
- 230000005291 magnetic effect Effects 0.000 claims abstract description 142
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 230000035945 sensitivity Effects 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims description 35
- 230000005298 paramagnetic effect Effects 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000005339 levitation Methods 0.000 claims 4
- 238000000691 measurement method Methods 0.000 abstract description 2
- 238000001739 density measurement Methods 0.000 description 6
- 239000013618 particulate matter Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/30—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by using centrifugal effects
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- 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
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Abstract
A kind of centrifugal density measuring equipment and method based on diamagnetic suspension theory of measuring technical field, it include: magnetic field generation device, measure case, rotating device and Image Acquisition control device, wherein: measurement case outer surface is provided with graduation mark on vertical and horizontal direction, measurement case is set in magnetic field generation device, magnetic field generation device and Image Acquisition control device are set on the Plane of rotation of rotating device and Image Acquisition control device is correspondingly arranged with measurement case, the image information of Image Acquisition control device acquisition measurement case simultaneously controls information to rotating device output revolving speed.The present invention shortens time of measuring by rotary and centrifugal type dynamic measurement method, and under conditions of not changing solution concentration and external magnetic field is distributed, by adjusting motor speed and rotating centrifugal radius, realizes the adjusting of measurement sensitivity.
Description
Technical Field
The invention relates to a technology in the field of measurement and metering, in particular to a centrifugal density measuring device and method based on the diamagnetic suspension principle.
Background
Density is one of the basic physical properties of a substance, and its measurement has wide application in the fields of biology, medical treatment, physics, chemical industry, food, and the like. At present, the density measurement mode mainly comprises balance weighing, a hydrometer, a density gradiometer, a suspension microchannel gradiometer, a magnetic suspension balance meter and the like. However, these methods are generally expensive, inconvenient, time consuming, complex to measure, and not easy to measure less dense, irregularly shaped materials.
With the continuous development of the diamagnetic suspension technology, the material density measurement is realized by measuring the suspension height based on the diamagnetic suspension technology material density measurement method, and the diamagnetic suspension material density measurement method has the characteristics of simple operation and portability. However, this measurement method takes a long time to measure, and the sensitivity of measurement cannot be continuously improved without changing the magnetic field device and the solution concentration.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a centrifugal density measuring device and a centrifugal density measuring method based on the diamagnetic suspension principle, which shorten the measuring time by a rotary centrifugal dynamic measuring method, and realize the adjustment of the measuring sensitivity by adjusting the rotating speed of a motor and the rotary centrifugal radius under the condition of not changing the solution concentration and the distribution of an external magnetic field.
The invention is realized by the following technical scheme:
the invention relates to a centrifugal density measuring device based on the diamagnetic suspension principle, which comprises: magnetic field produces device, measurement case, rotary device and image acquisition controlling means, wherein: the outer surface of the measuring box is provided with scale marks in the vertical and horizontal directions, the measuring box is arranged in the magnetic field generating device, the magnetic field generating device and the image acquisition control device are arranged on a rotating plane of the rotating device, the image acquisition control device and the measuring box are correspondingly arranged, and the image acquisition control device acquires image information of the measuring box and outputs rotating speed control information to the rotating device.
The magnetic field generating device comprises: two backup pads, frame spliced pole, first fixed magnetic field generating unit, the fixed magnetic field generating unit of second, the fixed magnetic field generating unit of third and the fixed magnetic field generating unit of fourth of parallel arrangement, wherein: two backup pads of parallel arrangement pass through the fixed braced frame that forms of frame spliced pole, first fixed magnetic field generating unit, second fixed magnetic field generating unit, third fixed magnetic field generating unit and fourth fixed magnetic field generating unit respectively with braced frame fixed connection, and first fixed magnetic field generating unit and second fixed magnetic field generating unit magnetize along vertical direction, and the magnetic pole of the same name sets up relatively from top to bottom, fourth fixed magnetic field generating unit and third fixed magnetic field generating unit magnetize along the horizontal direction, and the magnetic pole of the same name sets up relatively about, first fixed magnetic field generating unit is adjacent with the magnetic pole of the third fixed magnetic field generating unit synonym.
The first fixed magnetic field generating unit, the second fixed magnetic field generating unit, the third fixed magnetic field generating unit and the fourth fixed magnetic field generating unit are preferably provided with permanent magnets or other devices capable of generating constant magnetic fields.
The geometric shape, the size and the magnetic performance grade of the permanent magnet are the same.
The rotating device comprises: frame backup pad, motor mounting panel, motor, shaft coupling, connecting axle, bearing mounting panel, rotating disc and installation disc, wherein: the motor mounting plate and the bearing mounting plate are arranged on the frame supporting plate, the motor is arranged on the motor mounting plate, the motor is connected with the connecting shaft through a coupler to transmit rotary motion, the bearing is arranged on the bearing mounting plate, the connecting shaft and the bearing are in transition fit, the tail end of the connecting shaft is connected with the rotary disc and transmits rotary motion, and the rotary disc is connected with the mounting disc and transmits rotary motion.
Two rows of threaded holes with equal intervals are symmetrically arranged on the mounting disc, and the interval between every two adjacent threaded holes in the same row is d; the second fixed magnetic field generating unit is fixedly connected with the mounting disc through threads.
The image acquisition control device includes but is not limited to: image acquisition device and computer that links to each other, wherein: the image acquisition device is aligned with the horizontal position scale marks on the measuring box in the horizontal direction.
The invention relates to a method for measuring density of diamagnetic particles based on the device, which comprises the following steps:
step 1: preparing paramagnetic solution, placing the paramagnetic solution in a measuring box, and filling the measuring box;
step 2: putting diamagnetic particles to be detected into a measuring box containing a prepared paramagnetic solution, and if the diamagnetic particles stably suspend in the measuring box of a magnetic field generating device, connecting and fixing the measuring box and the magnetic field generating device through bolts; if the diamagnetic particles settle in the measuring box, reconfiguring a paramagnetic solution with higher solution concentration until the diamagnetic particles stably suspend;
and step 3: setting the rotating speed and/or the rotating centrifugal radius of the motor according to the requirement of measuring sensitivity, and fixedly connecting the magnetic field generating device provided with the measuring box with the rotating device; and in the process of rotating at the set rotating speed, measuring the displacement of the diamagnetic particles in the horizontal direction through the image acquisition device, and calculating the density value of the diamagnetic particles to be measured.
The measuring sensitivity is changed by adjusting the rotating speed of the motor and/or adjusting the rotating centrifugal radius of the magnetic field generating device on the mounting disc.
Technical effects
Compared with the prior art, the device is based on the principle of diamagnetic suspension, the sum of the diamagnetic force and the buoyancy force of the diamagnetic particulate matter in the vertical direction is balanced with the gravity of the diamagnetic particulate matter, and the diamagnetic force of the diamagnetic particulate matter in the horizontal direction is balanced with the rotating centrifugal force by adjusting the rotating speed and the rotating centrifugal radius of the motor, so that the diamagnetic particulate matter to be measured can realize the suspension balance in a rotating state in a short time, the defects of complicated operation and long consumed time of the existing density sensor are overcome, and the adjustable sensitivity of density measurement is realized by adjusting the rotating speed of the motor and changing the rotating centrifugal radius.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an exploded view of the magnetic field generating device according to the present invention;
FIG. 3 is a schematic structural diagram of a first fixed magnetic field generating unit according to the present invention;
FIG. 4 is a schematic structural diagram of a second fixed magnetic field generating unit according to the present invention;
FIG. 5 is a schematic view of a rotary device according to the present invention;
FIG. 6 is a top view of the mounting disk of the present invention;
in the figure: the device comprises a magnetic field generating device 1, a measuring box 2, a rotating device 3, an image acquisition device 4, a computer 5, a first fixed magnetic field generating unit 6, a third fixed magnetic field generating unit 7, a second fixed magnetic field generating unit 8, a fourth fixed magnetic field generating unit 9, a support plate 10, a frame connecting column 11, a first pressure plate 12, a first permanent magnet 13, a first clamp 14, a first frame connecting threaded hole 15, a first pressure plate connecting threaded hole 16, a second pressure plate 17, a second permanent magnet 18, a second clamp 19, a rotating installation countersunk hole 20, a second frame connecting threaded hole 21, a second pressure plate connecting threaded hole 22, an installation disc 23, a rotating disc 24, a bearing installation plate 25, a coupler 26, a motor installation plate 27, a motor 28, a frame support plate 29, a connecting shaft 30, a bearing 31, a threaded hole 32 and a countersunk circular hole 33.
Detailed Description
As shown in fig. 1, the present embodiment includes: magnetic field generating device 1, measurement case 2, rotary device 3, image acquisition device 4 and computer 5, wherein: the outer surface of the measuring box 2 is provided with scale marks in the vertical and horizontal directions, the measuring box 2 is arranged in the magnetic field generating device 1, the magnetic field generating device 1 and the image acquisition device 4 are arranged on the installation disc 23 of the rotating device 3, the image acquisition device 4 is arranged corresponding to the measuring box 2, the image acquisition device 4 is connected with the computer 5 and outputs the image information of the measuring box 2, and the computer 5 is connected with the rotating device 3 and outputs the rotating speed control information;
as shown in fig. 2, the magnetic field generating apparatus 1 includes: two backup pads 10, frame spliced pole 11, first fixed magnetic field generating unit 6, the fixed magnetic field generating unit of second 8, the fixed magnetic field generating unit of third 7 and the fixed magnetic field generating unit of fourth 9 of parallel arrangement, wherein: two support plates 10 which are arranged in parallel are fixedly connected through a frame connecting column 11 by bolts to form a support frame, a first fixed magnetic field generating unit 6, a second fixed magnetic field generating unit 8, a third fixed magnetic field generating unit 7 and a fourth fixed magnetic field generating unit 9 are respectively fixedly connected with the support frame through bolts, the first fixed magnetic field generating unit 6 and the second fixed magnetic field generating unit 8 are magnetized along the vertical direction, the third fixed magnetic field generating unit 7 and the fourth fixed magnetic field generating unit 9 are magnetized along the horizontal direction, and the like magnetic poles of the first fixed magnetic field generating unit 6 and the second fixed magnetic field generating unit 8 are arranged oppositely up and down, the like magnetic poles of the third fixed magnetic field generating unit 7 and the fourth fixed magnetic field generating unit 9 are arranged oppositely left and right, and the unlike magnetic poles of the first fixed magnetic field generating unit 6 and the third fixed magnetic field generating unit 7 are adjacent.
As shown in fig. 3, the first fixed magnetic field generating unit 6, the third fixed magnetic field generating unit 7, and the fourth fixed magnetic field generating unit 9 have the same structure, and each of them includes: first anchor clamps 14, first pressure strip 12 and first permanent magnet 13, wherein: the first fixture 14 is provided with a groove for fixing the first permanent magnet 13 in the transverse direction, first frame connecting threaded holes 15 are symmetrically formed in two sides of the groove and fixedly connected with the supporting plate 10 through bolts, and the first fixture 14 and the first pressing plate 12 are used for fixing the first permanent magnet 13 in the longitudinal direction through first pressing plate connecting threaded holes 16.
As shown in fig. 4, the second fixed magnetic field generating unit 8 includes: second anchor clamps 19, second pressure strip 17 and second permanent magnet 18, wherein: the second fixture 19 is provided with a groove for fixing the second permanent magnet 18 in the transverse direction, a group of second frame connecting threaded holes 21 and a group of rotary mounting countersunk holes 20 are symmetrically arranged on two sides of the groove and are respectively fixedly connected with the support plate 10 and the mounting disc 23 through bolts, and the second fixture 19 and the second pressure plate 17 are used for fixing the second permanent magnet 18 in the longitudinal direction through a second pressure plate connecting threaded hole 22.
The supporting plate 10, the frame connecting column 11, the first clamp 14, the second clamp 19, the first pressing plate 12 and the second pressing plate 17 are all made of nonmagnetic alloy materials.
The first permanent magnet 13 and the second permanent magnet 18 are the same in geometric shape, size and magnetic performance grade.
The image acquisition device 4 is aligned with the horizontal position scale marks on the measuring box 2 in the horizontal direction.
As shown in fig. 5, the rotating device 3 includes: frame support plate 29, motor mounting plate 27, motor 28, shaft coupling 26, connecting axle 30, bearing 31, bearing mounting plate 25, rotating disc 24 and mounting disc 23, wherein: the motor mounting plate 27 and the bearing mounting plate 25 are arranged on the frame supporting plate 29, the motor 28 is arranged on the motor mounting plate 27, the motor 28 and the connecting shaft 30 are connected through the coupler 26 to transmit rotary motion, the bearing 31 is arranged on the bearing mounting plate 25, the connecting shaft 30 and the bearing 31 are in transition fit, the tail end of the connecting shaft 30 is connected with the rotating disc 24 and transmits rotary motion, and the rotating disc 24 is connected with the mounting disc 23 and transmits rotary motion.
As shown in fig. 6, two rows of threaded holes 32 with equal spacing are symmetrically formed in the mounting disc 23, and are fixedly connected with the rotary mounting countersunk holes 20 of the second permanent magnet assembly 8 through bolts; the distance between the two adjacent threaded holes 32 in the same row is d; the magnetic field generating device 1 is used for adjusting the position of the mounting disc 23, so as to adjust the rotating centrifugal radius, thereby meeting the requirement of density measurement sensitivity.
The mounting disc 23 is provided with four countersunk circular holes 33 with centrosymmetry and is fixedly connected with the rotating disc 24 through bolts.
The embodiment relates to a method for measuring the density of diamagnetic particles by the device, which comprises the following steps:
step 1: preparing paramagnetic solution, placing the paramagnetic solution in a measurement box 2, and filling the measurement box 2; the density and magnetic susceptibility of the solution can be obtained according to the molar concentration of the prepared paramagnetic solution;
step 2: putting diamagnetic particles to be detected into a measurement box 2 containing a prepared paramagnetic solution, and if the diamagnetic particles are stably suspended in the measurement box 2 of the magnetic field generating device 1, connecting and fixing the measurement box 2 and the magnetic field generating device 1 through bolts; if the diamagnetic particles settle in the measurement box 2, reconfiguring the paramagnetic solution with higher solution concentration to stably suspend the diamagnetic particles;
and step 3: according to the requirement of a measurer on the measurement sensitivity, the rotating speed and/or the rotating centrifugal radius of the motor 28 are/is set, and the magnetic field generating device 1 provided with the measurement box 2 is fixedly connected with the rotating device 3; and in the process of rotating at the set rotating speed, measuring the displacement of the diamagnetic particles in the horizontal direction through the image acquisition device 4, and calculating the density value of the diamagnetic particles to be measured.
The measurement sensitivity is changed by adjusting the rotational speed of the motor 28 and/or by adjusting the rotational eccentric radius of the magnetic field generating device 1 on the mounting disk 23.
Calculating the solution density according to the molar concentration c of the prepared paramagnetic solutionAnd solution magnetic susceptibility χm＝χpc-9×10-6Wherein: m is the relative molecular mass of solute, a is the mass percent of solute, chipIs the molar magnetic susceptibility of the solute in the solution being formulated.
Through the first fixed magnetic field generating unit 6, the second fixed magnetic field generating unit 8, the third fixed magnetic field generating unit 7, the magnetic field stack that the fourth permanent magnet subassembly 9 produced obtains at arbitrary point of measuring incasement within range, the relation that the magnetic induction intensity on the horizontal direction shifts along with the horizontal direction:
1) the function relation of the magnetic induction intensity of the first fixed magnetic field generating unit 6 and the second permanent fixed magnetic field generating unit 8 along the horizontal direction of the space with the change of the position is as follows:
wherein:
γ1,γ2,γ3as an auxiliary function Γ (γ)1,γ2,γ3) The number of the independent variables,Brthe remanence of the first permanent magnet 13 and the remanence of the second permanent magnet 18, a, b and h are respectively the length, width and height of the first permanent magnet 13 and the second permanent magnet 18;
2) the magnetic induction intensity of the third fixed magnetic field generating unit 7 and the fourth fixed magnetic field generating unit 9 in the spatial horizontal direction is in a function relation of position change:
wherein: as an auxiliary functionA, b, h are the length, width, height of the first permanent magnet 13, respectively;
in summary, the magnetic field in the horizontal direction of the space in the magnetic field generating apparatus 1 is:
Bx＝B1x+B2x。
in the rotating state, the diamagnetic force applied to the diamagnetic particles in the horizontal direction is as follows:
wherein: chi shapesFor the magnetic susceptibility, χ, of the diamagnetic particles to be measuredmMagnetic susceptibility of paramagnetic solution, V volume of diamagnetic particles, μ0＝4π×10-7H/m is the vacuum permeability, BxThe magnetic field in the horizontal direction in the magnetic field generating device 1 is generated.
The diamagnetic particles in the rotating state are subjected to diamagnetic force and centrifugal force in the horizontal direction in balance, so that the following results are obtained:
wherein: b'xIs magnetic induction intensity BxGradient for horizontal displacement x, psAs density of the particles to be measured, pmFor the solution density, ω is the rotation angular velocity of the motor, x is the displacement of the diamagnetic particles obtained by the image acquisition device 4 in the horizontal direction, n is the installation eccentricity coefficient of the magnetic field generation device 1 on the installation disc 23, and the value range n of n is 1,2,3,4,5, and d is the distance between two adjacent threads in the same row, so that the adjustment of the rotation centrifugal radius nd can be realized by adjusting the installation eccentricity coefficient n.
The density of the diamagnetic particulate matter to be measured in the rotating stateWhere ρ ismIs the solution density, chisFor the magnetic susceptibility, χ, of the diamagnetic particles to be measuredmMagnetic susceptibility of paramagnetic solution, B'xIs strongly magnetic inductionDegree BxA gradient of horizontal displacement x, which is the displacement of the diamagnetic particles in the horizontal direction, mu, obtained by the image acquisition means 40＝4π×10-7H/m is vacuum permeability, n is an installation eccentricity coefficient of the magnetic field generating device 1 on the installation disc 23, n is a value range of 1,2,3,4,5, ω is a rotation angular velocity of the motor, d is a distance between two adjacent threads in the same row, and nd is a rotation centrifugal radius.
The magnetic field sensor is a physical quantity irrelevant to the movement position of the diamagnetic particles and influences the measurement sensitivity, and as can be seen from an equation, the higher the motor rotating speed omega is, the higher the measurement sensitivity is; the larger the installation eccentricity coefficient n of the magnetic field generating device 1 on the installation disc 23 is, namely the larger the rotation centrifugal radius nd is, the higher the measurement sensitivity is; the adjustable sensitivity measurement is realized by adjusting the rotating speed omega of the motor or the rotating eccentricity nd.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A centrifugal density measuring device based on the principle of diamagnetic levitation, comprising: magnetic field produces device, measurement case, rotary device and image acquisition controlling means, wherein: the outer surface of the measuring box is provided with scale marks in the vertical and horizontal directions, the measuring box is arranged in the magnetic field generating device, the magnetic field generating device and the image acquisition control device are arranged on a rotating plane of the rotating device, the image acquisition control device is arranged corresponding to the measuring box, and the image acquisition control device acquires image information of the measuring box and outputs rotating speed control information to the rotating device;
the magnetic field generating device comprises: two backup pads, frame spliced pole, first fixed magnetic field generating unit, the fixed magnetic field generating unit of second, the fixed magnetic field generating unit of third and the fixed magnetic field generating unit of fourth of parallel arrangement, wherein: two backup pads of parallel arrangement pass through the fixed braced frame that forms of frame spliced pole, first fixed magnetic field generating unit, second fixed magnetic field generating unit, third fixed magnetic field generating unit and fourth fixed magnetic field generating unit respectively with braced frame fixed connection, and first fixed magnetic field generating unit and second fixed magnetic field generating unit magnetize along vertical direction, and the magnetic pole of the same name sets up relatively from top to bottom, fourth fixed magnetic field generating unit and third fixed magnetic field generating unit magnetize along the horizontal direction, and the magnetic pole of the same name sets up relatively about, first fixed magnetic field generating unit is adjacent with the magnetic pole of the third fixed magnetic field generating unit synonym.
2. The centrifugal density measuring device based on the diamagnetic levitation principle as recited in claim 1, wherein permanent magnets are arranged in the first fixed magnetic field generating unit, the second fixed magnetic field generating unit, the third fixed magnetic field generating unit and the fourth fixed magnetic field generating unit, and the geometric shape, the size and the magnetic performance grade of the permanent magnets are the same.
3. A centrifugal density measuring device based on the principle of diamagnetic levitation according to claim 1, wherein said rotating means comprises: frame backup pad, motor mounting panel, motor, shaft coupling, connecting axle, bearing mounting panel, rotating disc and installation disc, wherein: the motor mounting plate and the bearing mounting plate are arranged on the frame supporting plate, the motor is arranged on the motor mounting plate, the motor is connected with the connecting shaft through a coupler to transmit rotary motion, the bearing is arranged on the bearing mounting plate, the connecting shaft and the bearing are in transition fit, the tail end of the connecting shaft is connected with the rotary disc and transmits rotary motion, and the rotary disc is connected with the mounting disc and transmits rotary motion.
4. A centrifugal density measuring device based on the diamagnetic suspension principle according to claim 3, wherein two rows of threaded holes with equal spacing are symmetrically arranged on the mounting disc, and the spacing between two adjacent threaded holes in the same row is d; the second fixed magnetic field generating unit is fixedly connected with the mounting disc through threads.
5. A centrifugal density measuring apparatus based on diamagnetic levitation principle according to claim 1, wherein said image acquisition control means comprises: image acquisition device and computer that links to each other, wherein: the image acquisition device is aligned with the horizontal position scale marks on the measuring box in the horizontal direction.
6. A method for measuring the density of diamagnetic particles using the device of any of the preceding claims,
step 1: preparing paramagnetic solution, placing the paramagnetic solution in a measuring box, and filling the measuring box;
step 2: putting diamagnetic particles to be detected into a measuring box containing a prepared paramagnetic solution, and if the diamagnetic particles stably suspend in the measuring box of a magnetic field generating device, connecting and fixing the measuring box and the magnetic field generating device through bolts; if the diamagnetic particles settle in the measuring box, reconfiguring a paramagnetic solution with higher solution concentration until the diamagnetic particles stably suspend;
and step 3: setting the rotating speed and/or the rotating centrifugal radius of the motor according to the requirement of measuring sensitivity, and fixedly connecting the magnetic field generating device provided with the measuring box with the rotating device; and in the process of rotating at the set rotating speed, measuring the displacement of the diamagnetic particles in the horizontal direction through the image acquisition device, and calculating the density value of the diamagnetic particles to be measured.
7. The method as claimed in claim 6, wherein the density of diamagnetic particles to be measured is determined by the density of diamagnetic particlesWherein,ρmas density of paramagnetic solution, psIs the density, χ, of the particles to be measuredsFor the magnetic susceptibility, χ, of the diamagnetic particles to be measuredmMagnetic susceptibility of paramagnetic solution, B'xIs magnetic induction intensity BxA gradient of horizontal displacement x, where x is the displacement of the diamagnetic particles in the horizontal direction, mu, obtained by the image acquisition device0＝4π×10-7H/m is vacuum permeability, n is an installation eccentricity coefficient of the magnetic field generating device on the installation disc, the value range n of n is 1,2,3,4,5, omega is the rotation angular velocity of the motor, d is the distance between two adjacent threads in the same row, and nd is the rotation centrifugal radius.
8. The method of claim 7, wherein the sensitivity of the measurement is changed by adjusting the rotational speed of the motor and/or adjusting the centrifugal radius of the magnetic field generating device on the mounting disk.
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| CN111426599B (en) * | 2020-04-20 | 2021-07-30 | 上海交通大学 | Dynamic diamagnetic suspension multi-dimensional density measuring device and method |
| CN114295257B (en) * | 2021-12-29 | 2022-09-06 | 河海大学 | Force sensor based on anti-magnetic suspension principle and measuring method thereof |
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| CN106568681A (en) * | 2016-06-14 | 2017-04-19 | 浙江大学 | Precise measurement method for density of antimagnetic material |
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| US20130133419A1 (en) * | 2011-08-25 | 2013-05-30 | George M. Whitesides | Magnetic levitation for forensics analysis |
| WO2013188725A1 (en) * | 2012-06-14 | 2013-12-19 | President And Fellows Of Harvard College | Levitation of materials in paramagnetic ionic liquids |
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| CN106568681A (en) * | 2016-06-14 | 2017-04-19 | 浙江大学 | Precise measurement method for density of antimagnetic material |
Non-Patent Citations (3)
| Title |
|---|
| 《A centrifugal magneticl evitation approach for high-reliability density》;Qiu-Hua Gao et al.;《Sensors and Actuators B: Chemical》;20190210;第287卷;第64-70页 |
| 《High-Sensitivity Measurement of Density by Magnetic Levitation》;Alex Nemiroski et al.;《Analytical Chemistry》;20160127;第88卷;第2666-2674页 |
| 《Tunable rotating-mode density measurement using magnetic levitation》;Qiu-Hua Gao et al.;《Applied Physics Letters》;20180404;第112卷;第142408-1~5页 |
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