CN114935329A - Magnetic liquid horizontal inclination angle sensor - Google Patents
Magnetic liquid horizontal inclination angle sensor Download PDFInfo
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- CN114935329A CN114935329A CN202210538101.9A CN202210538101A CN114935329A CN 114935329 A CN114935329 A CN 114935329A CN 202210538101 A CN202210538101 A CN 202210538101A CN 114935329 A CN114935329 A CN 114935329A
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- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 230000006698 induction Effects 0.000 claims abstract description 127
- 230000005284 excitation Effects 0.000 claims description 18
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims 1
- 239000011553 magnetic fluid Substances 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 description 12
- 230000008859 change Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
- G01C2009/187—Measuring inclination, e.g. by clinometers, by levels by using liquids magnetic, e.g. ferromagnetic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The embodiment of the application provides a horizontal inclination sensor of magnetic fluid belongs to sensor technical field, includes: an annular tube; the magnetic liquid is positioned in the annular pipe, and the volume of the magnetic liquid is 1/2 of the volume of the annular pipe; the coil assembly comprises a first induction coil, a second induction coil and an exciting coil; the first induction coil, the second induction coil and the exciting coil are wound on the annular tube; the first induction coil and the second induction coil respectively occupy a half length of the annular tube, and are symmetrically distributed on the annular tube, and the first induction coil and the second induction coil are reversely connected in series; the exciting coil is wound along the length direction of the annular tube and is connected with an external power supply. Through the horizontal tilt angle sensor of magnetic liquid that this application embodiment provided, convenience when can improving the measurement three-dimensional space inclination.
Description
Technical Field
The embodiment of the application relates to the technical field of sensors, in particular to a magnetic liquid horizontal inclination angle sensor.
Background
In many working situations, it is necessary to measure the relative angle of the measured object to the horizontal plane, such as bridges, dams, etc. Meanwhile, many engineering machines are leveled, and the launching angles of the satellite missiles and the like all need inclination sensors.
At present, common inclination angle sensors on the market are all pendulum type and are divided into a liquid pendulum gas pendulum and a solid pendulum. Most of the sensors have complex structures and high cost, and some sensors have a plurality of requirements and limits on measuring environments. In contrast, a magnetic liquid tilt angle sensor formed using the property of the magnetic liquid is superior in terms of linearity, reliability, and resolution, while eliminating the above-described disadvantages.
However, the magnetic liquid tilt angle sensor in the related art is inconvenient in measuring the tilt angle in the three-dimensional space.
Disclosure of Invention
The embodiment of the application provides a magnetic liquid horizontal inclination angle sensor, and aims to improve convenience in measuring a three-dimensional space inclination angle.
The embodiment of the application provides a horizontal inclination sensor of magnetic fluid, includes:
an annular tube;
magnetic liquid, wherein the magnetic liquid is positioned in the annular pipe, and the volume of the magnetic liquid is 1/2 of the volume of the annular pipe;
the coil assembly comprises a first induction coil, a second induction coil and an exciting coil;
the first induction coil, the second induction coil and the excitation coil are wound on the annular tube;
the first induction coil and the second induction coil respectively occupy a half length of the annular tube, the first induction coil and the second induction coil are symmetrically distributed on the annular tube, and the first induction coil and the second induction coil are connected in series in an opposite direction;
the excitation coil is wound along the length direction of the annular tube, the excitation coil is positioned on the outer sides of the first induction coil and the second induction coil, and the excitation coil is connected with an external power supply.
Optionally, the sensor further comprises a signal amplification circuit, and the signal amplification circuit is connected with the first induction coil and the second induction coil.
Optionally, the number of turns of the first induction coil and the number of turns of the second induction coil are equal.
Optionally, a plurality of insulating parts are arranged on the annular pipe, and the insulating parts are arranged on the annular pipe at regular intervals along the length direction of the annular pipe;
the first induction coil, the second induction coil and the excitation coil are wound on the annular tube through the plurality of insulating parts.
Optionally, a fixing portion is disposed on the insulating portion, and the fixing portion is configured to fix the first induction coil, the second induction coil, and the excitation coil.
Optionally, the fixing portion is configured as a fixing hole or a fixing groove.
Optionally, the material of the annular tube comprises: glass or acrylic.
Optionally, the excitation coil is wound equidistant from the first and second induction coils.
Optionally, the external power supply is an ac power supply.
Optionally, the magnetic liquid is an oil-based magnetic liquid.
Has the advantages that:
the application provides a magnetic liquid horizontal inclination angle sensor, which is characterized in that a ring-shaped pipe and magnetic liquid positioned in the ring-shaped pipe are arranged, so that the volume of the magnetic liquid is half of the volume of the ring-shaped pipe, a first induction coil, a second induction coil and an excitation coil are further arranged, the first induction coil and the second induction coil are symmetrically distributed on the ring-shaped pipe, the first induction coil and the second induction coil are reversely connected in series, and the excitation coil is connected with an external power supply; like this, utilize exciting coil can produce magnetic field, when measuring the inclination, the ring pipe is changed to the tilt state by the horizontality, the mobility of magnetic fluid can make the liquid level of magnetic fluid change this moment, thereby make the magnetic fluid volume of ring pipe both sides change, and because the magnetic field that exciting coil produced, first induction coil and second induction coil can produce induced voltage, simultaneously because the change of magnetic fluid volume of ring pipe both sides leads to the magnetic permeability to change, make the induced voltage that first induction coil and second induction coil produced different, and then the output voltage difference, according to the voltage difference recalculate alright with the size that obtains the inclination, so just make the sensor can directly measure three-dimensional space inclination, and the structure of whole sensor is comparatively simple, it is more convenient to use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic plan view of a magnetic liquid tilt sensor according to an embodiment of the present application;
fig. 2 is a schematic side view of a magnetic liquid horizontal tilt sensor according to an embodiment of the present disclosure;
fig. 3 is a schematic side view of a magnetic liquid level tilt sensor according to an embodiment of the present disclosure when the magnetic liquid level tilt sensor is tilted.
Description of reference numerals: 1. an annular tube; 2. a magnetic liquid; 3. a coil assembly; 4. an insulating section.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, a magnetic liquid horizontal tilt angle sensor disclosed in the embodiments of the present application includes a ring tube 1, a magnetic liquid 2, and a coil assembly 3, where the coil assembly includes a first induction coil, a second induction coil, and an excitation coil.
Specifically, the annular tube 1 can be made of glass or acrylic materials or other transparent materials, so that the internal condition of the annular tube 1 can be observed conveniently. When the sensor is not in use, the ring tube 1 is placed horizontally in the diameter direction of the ring.
The first induction coil and the second induction coil are wound on the outer wall of the annular tube 1, and the first induction coil and the second induction coil respectively occupy the annular tube 1 with half length. Specifically, when a first induction coil and a second induction coil are wound, the first induction coil is wound on the annular tube 1, until the wound first induction coil covers half of the annular tube 1, the second induction coil is wound on the annular tube 1, the second induction coil covers the other half of the annular tube 1, the number of turns of the first induction coil and the number of turns of the second induction coil are equal, so that the first induction coil and the second induction coil are symmetrically distributed on the annular tube 1, and a symmetrical line of the first induction coil and the second induction coil is a diameter line of the annular tube 1. When the inclination angle is measured, the circular tube 1 is rotated by taking the symmetry line of the first induction coil and the second induction coil as an axis.
Meanwhile, the first induction coil and the second induction coil are connected in series in an opposite direction.
After the first induction coil and the second induction coil are wound, the exciting coil is wound on the outer sides of the first induction coil and the second induction coil on the annular tube 1 along the length direction of the annular tube 1, and the exciting coil is equidistant to the first induction coil and the second induction coil. Two ends of the exciting coil are connected with an external power supply, and specifically, the external power supply is an alternating current power supply.
Like this, after letting in external power supply, exciting coil just can produce magnetic field, first induction coil and second induction coil can produce induced voltage correspondingly simultaneously, and when the symmetry line of ring pipe 1 with first induction coil and second induction coil rotated, because the change of the magnetic liquid volume in the ring pipe 1, the mixed permeability that ring pipe 1 used this symmetry line as the both sides of central line can change correspondingly, under the influence of mixed permeability, the induced voltage that first induction coil and second induction coil produced also can be different.
Therefore, a voltage difference can occur between the first induction coil and the second induction coil, so that the sensor can output the voltage difference value, and the rotating angle of the annular tube 1 can be obtained according to the voltage difference, and further the measurement of the three-dimensional space inclination angle is realized.
So just solved the inconvenient problem of sensor measurement three-dimensional space angle of inclination among the correlation technique, and the sensor overall structure that this application disclosed is simple, low in production cost, the equipment preparation of being more convenient for.
The sensor disclosed in the embodiment of the present application calculates the three-dimensional space inclination angle as follows:
suppose that the current in the excitation coil is I ═ I 0 sinωt；
Then the magnetic induction inside the annular tube 1:
wherein l is the length of the exciting coil, N is the number of turns of the exciting coil, μ is the mixed magnetic permeability of the magnetic liquid 2 and air, and I 0 Is the input current of the external power supply.
Magnetic flux through the first and second induction coils
Wherein N is 1 Number of turns of the first and second induction coils, S 0 The cross-sectional area of the annular duct 1.
Therefore, it can be obtained that the induced voltages generated by the first induction coil and the second induction coil are:
and mixed permeability mu-k mu m +(1-k)μ 0 ；
Wherein, mu m Is the magnetic permeability, mu, of the magnetic liquid 0 K is the ratio of the volume of the magnetic liquid 2 in the first induction coil or the second induction coil to the total volume of the toroidal tube 1, in terms of the permeability of air.
That is to say that the first and second electrodes,
wherein, V m Is the volume of the magnetic liquid 2 in the first or second induction coil, and V is the volume of the first or second induction coil surrounding the toroidal tube 1.
When the sensor rotates an angle alpha 1 The change in volume of the magnetic liquid 2 in the annular tube 1 is:
wherein l 1 Is the length of the first induction coil or the second induction coil and is used in this application2π(R-r)＝3l 1 That is, the length of the single induction coil is 1/3 of the length of the ring pipe 1, R is the inner section radius of the ring pipe 1, and R is the radius of the whole ring pipe 1.
Then it is possible to obtain:
thus, the mixed permeability of the first induction coil portion is:
the mixed permeability of the second induction coil part is:
substituting the mixed magnetic permeability of the first induction coil part and the mixed magnetic permeability of the second induction coil part into a formula for calculating induction voltage respectively to obtain the voltage difference between the first induction coil and the second induction coil as follows:
then the magnetic permeability mu of the magnetic liquid 2 is measured m ＝μ 0 (1+ χ), wherein χ is the susceptibility; cross-sectional area S of annular tube 1 0 ＝πr 2 (ii) a Number of turns per unit length of exciting coil
Substituting the formula to obtain:
after the output voltages of the first induction coil and the second induction coil are rectified, filtered and amplified, the obtained voltages are as follows:
U 0 ＝λχnN 1 I 0 r(R-r)α 1 f
where f is the frequency of the current through the excitation coil and λ is a constant.
Assuming again that the sensitivity of the sensor is σ, we can get:
therefore, the linear relation between the output voltage and the change of the inclination angle is shown, and therefore the inclination angle can be calibrated.
That is, the magnitude of the tilt angle is:
in one embodiment, in order to better acquire the voltage difference output by the first induction coil and the second induction coil, the sensor further comprises a signal amplification circuit, the signal amplification circuit is connected with the first induction coil and the second induction coil, and the voltage difference output by the first induction coil and the second induction coil can be amplified by the signal amplification circuit, so that the detection of the inclination angle is more facilitated.
In one embodiment, a plurality of insulating parts 4 are arranged on the annular tube 1, and the plurality of insulating parts 4 are uniformly arranged at intervals along the length direction of the annular tube 1.
Specifically, the insulating portion 4 employs an insulating material such as rubber. Meanwhile, the first induction coil, the second induction coil and the exciting coil are wound on the annular tube 1 through the insulating parts, so that the problem of difficulty in winding the coils can be solved by using the plurality of insulating parts 4, the connection of a circuit is facilitated, and the interference between signals is reduced.
Meanwhile, the insulating part 4 is also provided with a fixing part, and the first induction coil, the second induction coil and the exciting coil can be further and better fixed by the fixing part. In a specific application, the fixing portion may be a fixing hole, a fixing groove, or the like.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. Moreover, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or should not be construed as indicating or implying relative importance. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or terminal equipment comprising the element.
The technical solutions provided in the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the present application, and the content of the present specification should not be construed as limiting the present application. While various modifications of the described embodiments and applications will be apparent to those skilled in the art in light of the disclosure herein, it is not desired to be exhaustive or exhaustive all of the embodiments and obvious variations or modifications are possible in light of the above teachings.
Claims (10)
1. A magnetic liquid horizontal tilt sensor, comprising:
an annular tube;
magnetic liquid, wherein the magnetic liquid is positioned in the annular pipe, and the volume of the magnetic liquid is 1/2 of the volume of the annular pipe;
the coil assembly comprises a first induction coil, a second induction coil and an exciting coil;
the first induction coil, the second induction coil and the excitation coil are wound on the annular tube;
the first induction coil and the second induction coil respectively occupy a half length of the annular tube, the first induction coil and the second induction coil are symmetrically distributed on the annular tube, and the first induction coil and the second induction coil are connected in series in an opposite direction;
the excitation coil is wound along the length direction of the annular tube, the excitation coil is positioned on the outer sides of the first induction coil and the second induction coil, and the excitation coil is connected with an external power supply.
2. The magnetic liquid horizontal tilt sensor according to claim 1, wherein:
the sensor further comprises a signal amplification circuit, and the signal amplification circuit is connected with the first induction coil and the second induction coil.
3. The magnetic liquid horizontal tilt sensor according to claim 1, wherein:
the number of turns of the first induction coil is equal to the number of turns of the second induction coil.
4. The magnetic liquid horizontal tilt sensor according to any one of claims 1 to 3, wherein:
the annular pipe is provided with a plurality of insulating parts which are uniformly arranged on the annular pipe at intervals along the length direction of the annular pipe;
the first induction coil, the second induction coil and the excitation coil are wound on the annular tube through the plurality of insulating parts.
5. The magnetic liquid horizontal tilt sensor according to claim 4, wherein:
the insulating part is provided with a fixing part, and the fixing part is used for fixing the first induction coil, the second induction coil and the exciting coil.
6. The magnetic liquid horizontal tilt sensor of claim 5, wherein: the fixing part is set as a fixing hole or a fixing groove.
7. The magnetic liquid horizontal tilt sensor according to claim 1, wherein: the material of the annular tube comprises: glass or acrylic.
8. The magnetic liquid horizontal tilt sensor according to claim 1, wherein: the excitation coil is wound equidistant from the first and second induction coils.
9. The magnetic liquid horizontal tilt sensor according to claim 1, wherein: the external power supply is an alternating current power supply.
10. The magnetic liquid horizontal tilt sensor according to claim 1, wherein: the magnetic liquid is engine oil-based magnetic liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210538101.9A CN114935329A (en) | 2022-05-18 | 2022-05-18 | Magnetic liquid horizontal inclination angle sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210538101.9A CN114935329A (en) | 2022-05-18 | 2022-05-18 | Magnetic liquid horizontal inclination angle sensor |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2440556C1 (en) * | 2010-10-11 | 2012-01-20 | Открытое акционерное общество "Завод им. В.А. Дегтярева" | Tilt sensor |
| CN104406571A (en) * | 2014-11-27 | 2015-03-11 | 太原理工大学 | Two-dimensional sensor for online measurement of object tilt angle and tilt angle measuring method of two-dimensional sensor |
| CN205537693U (en) * | 2016-03-14 | 2016-08-31 | 安徽沃巴弗电子科技有限公司 | Moment of torsion angle sensor's wire winding structure |
| CN106969750A (en) * | 2017-05-09 | 2017-07-21 | 河北工业大学 | Magnetic liquid omniazimuthal horizontal obliquity sensor |
| CN107631719A (en) * | 2017-08-24 | 2018-01-26 | 云南靖创液态金属热控技术研发有限公司 | A kind of obliquity sensor based on liquid metal |
| CN107843236A (en) * | 2017-10-26 | 2018-03-27 | 杨晓艳 | A kind of magnetic fluid inclined sensor |
| CN208027899U (en) * | 2018-04-25 | 2018-10-30 | 长兴索菲特电子股份有限公司 | A kind of anti-tampering patch wire-wound inductor |
-
2022
- 2022-05-18 CN CN202210538101.9A patent/CN114935329A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2440556C1 (en) * | 2010-10-11 | 2012-01-20 | Открытое акционерное общество "Завод им. В.А. Дегтярева" | Tilt sensor |
| CN104406571A (en) * | 2014-11-27 | 2015-03-11 | 太原理工大学 | Two-dimensional sensor for online measurement of object tilt angle and tilt angle measuring method of two-dimensional sensor |
| CN205537693U (en) * | 2016-03-14 | 2016-08-31 | 安徽沃巴弗电子科技有限公司 | Moment of torsion angle sensor's wire winding structure |
| CN106969750A (en) * | 2017-05-09 | 2017-07-21 | 河北工业大学 | Magnetic liquid omniazimuthal horizontal obliquity sensor |
| CN107631719A (en) * | 2017-08-24 | 2018-01-26 | 云南靖创液态金属热控技术研发有限公司 | A kind of obliquity sensor based on liquid metal |
| CN107843236A (en) * | 2017-10-26 | 2018-03-27 | 杨晓艳 | A kind of magnetic fluid inclined sensor |
| CN208027899U (en) * | 2018-04-25 | 2018-10-30 | 长兴索菲特电子股份有限公司 | A kind of anti-tampering patch wire-wound inductor |
Non-Patent Citations (6)
| Title |
|---|
| DONATINI F,: "Investigation of an inclination sensor using magnetic fluid for angle measurement up to 90 degrees", 《MEASUREMENT SCIENCE AND TECHNOLOGY》 * |
| OLARU R: "Inductive tilt sensor with magnets and magnetic fluid", 《SENSORS AND ACTUATORS A PHYSICAL》 * |
| SU S: "The study of a novel tilt sensor using magnetic fluid and its detection mechanism", 《IEEE SENSORS JOURNAL》 * |
| XIANGDONG K: "Summary of Research on Magnetic Fluid and Its Inclination Sensor", 《JOURNAL OF ENGINEERING RESEARCH AND REPORTS》 * |
| YIK KIN CHEUNG: "Electrochemical Tilt Sensors With Symmetric Concentric Electrode Pairs", 《IEEE SENSORS JOURNAL》 * |
| 钱乐平: "新型磁性液体惯性传感器的理论与实验研究", 《仪器仪表学报》 * |
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