CN202119389U - Tiny inclination angle sensor based on magnetorheo-logical fluid - Google Patents
Tiny inclination angle sensor based on magnetorheo-logical fluid Download PDFInfo
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- CN202119389U CN202119389U CN 201120144392 CN201120144392U CN202119389U CN 202119389 U CN202119389 U CN 202119389U CN 201120144392 CN201120144392 CN 201120144392 CN 201120144392 U CN201120144392 U CN 201120144392U CN 202119389 U CN202119389 U CN 202119389U
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- inclination angle
- magnetorheo
- magnetorheological fluid
- logical fluid
- detection
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- 239000012530 fluid Substances 0.000 title claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model relates to a tiny inclination angle sensor based on a magnetorheo-logical fluid. The magnetorheo-logical fluid is placed into a nonmagnetic container, and the volume of the magnetorheo-logical fluid occupies the half volume of the nonmagnetic container. A detecting capacitor is arranged on the upper and lower ends of the nonmagnetic container. When the nonmagnetic container deflects an angel along a reference direction, the medium proportion (the air part and the magnetorheo-logical fluid part) of the detecting capacitor has a change, so the detecting capacitance also has a change, i.e. the inclination angel can be known according to the detecting capacitance. Because the dielectric constant of the magnetorheo-logical fluid varies along with the changes of the outer magnetic field, the approximate linear relation between the detecting capacitance and the inclination angle can be realized and the detecting capacitance can be changed through adjusting the magnetic field, and the sensitivity of the sensor can be improved.
Description
Technical Field
The utility model belongs to small inclination sensor's application, concretely relates to small inclination sensor based on magnetorheological suspensions.
Background
When the magnetorheological fluid has no external magnetic field, the magnetorheological fluid is in a liquid state with good fluidity; the apparent viscosity can be increased to more than two orders of magnitude in a short time (millisecond) under the action of an applied magnetic field, so that a solid-like state is presented. A "solid" magnetorheological fluid can be rapidly converted to a fluid state after removal of the external magnetic field (Wojciech Szelag. thin element analysis of the magnetic-mechanical fl a uid crystals [ J ].2004, 23(3): 758-.
A micro tilt sensor is a device capable of measuring the tilt of a work system. The inclination degree of the working system relative to the reference surface can be obtained by measuring the inclination angle, and the micro inclination angle sensor is widely applied to the fields of horizontal position inclination measurement, guide rail straightness measurement, flat plate flatness measurement, angle monitoring and the like. The existing micro tilt angle sensor has a complex structure and high price; or the structure is simple and the sensitivity is low.
Disclosure of Invention
In order to realize the high and simple small inclination sensor of measuring device of sensitivity, the utility model provides a small inclination sensor of magnetorheological suspensions. The device mainly comprises an inclination angle testing device and a signal conversion circuit.
The inclination angle testing device consists of a non-magnetic container, a detection capacitor, a magnetic field coil and magnetorheological fluid. The magnetorheological fluid is placed in a non-magnetic container, and the volume of the magnetorheological fluid is half of that of the non-magnetic container. The detection capacitors are placed at the upper and lower ends of the non-magnetic container as shown in FIG. 1. When the non-magnetic container deflects at an angle along the reference direction, the proportion of media (air part and magnetorheological fluid part) in the detection capacitor changes, so that the detection capacitor changes. That is, the tilt angle can be obtained by detecting the capacitance. The magnetic field coil is used for providing a magnetic field for the magnetorheological fluid, and the magnetic field is adjusted to enable the detection capacitance and the inclination angle to be approximately in a linear relationship, and the size of the detection capacitance can be changed, so that the sensitivity of the sensor is improved.
The signal conversion circuit is composed of a proportional operation circuit composed of a detection capacitor, a feedback resistor, a feedback capacitor and an operational amplifier. After the proportional operation circuit is excited by an alternating voltage signal, the change of the detection capacitor along with the inclination angle is converted into the alternating voltage signal. And calculating and processing the voltage signal by using an embedded system or a virtual instrument or a singlechip to obtain the size of the inclination angle of the non-magnetic container.
The utility model discloses simple structure not only can detect the size at small inclination effectively, simple structure moreover, and the linearity is good, and sensitivity is high.
The utility model discloses the technical scheme who adopts as follows:
a magnetorheological fluid micro tilt angle sensor comprises a tilt angle testing device and a signal conversion circuit.
The inclination angle testing device is composed of a non-magnetic container, a detection capacitor, a magnetic field coil and magnetorheological fluid. The magnetorheological fluid is placed in a non-magnetic container, and the volume of the magnetorheological fluid is half of that of the non-magnetic container. The detection capacitors are placed at the upper and lower ends of the non-magnetic container as shown in FIG. 1. When the non-magnetic container deflects at an angle along the reference direction, the proportion of media (air part and magnetorheological fluid part) in the detection capacitor changes, so that the detection capacitor changes. That is, the tilt angle can be obtained by detecting the capacitance. The magnetic field coil is used for providing a magnetic field for the magnetorheological fluid, so that the sensitivity of the sensor is improved.
The signal conversion circuit is composed of a proportional operation circuit composed of a detection capacitor, a feedback resistor, a feedback capacitor and an operational amplifier. When in test, an alternating voltage signal is input into the circuit, and after the alternating voltage signal excites the proportional operation circuit, the change of the detection capacitor along with the inclination angle is converted into the alternating voltage signal. And calculating and processing the voltage signal by using an embedded system or a virtual instrument or a singlechip to obtain the size of the inclination angle of the non-magnetic container.
The utility model is characterized in that:
(1) and designing the magnetorheological fluid micro inclination angle sensor.
(2) The detection device has simple structure, good linearity and high sensitivity.
(3) Provides a new method for the application of the magnetorheological fluid in the sensing technology.
Drawings
:
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a schematic view of a tilt angle testing apparatus of the present invention;
in the figure, 1 is a non-magnetic container, 2 is a detection capacitor, 3 is magnetorheological fluid, and 4 is a magnetic field coil
FIG. 2 is a signal conversion circuit diagram;
FIG. 3 is a graph of capacitance versus tilt angle;
the specific implementation mode is as follows:
referring to fig. 1, the utility model relates to a tilt angle testing device comprises non-magnetic container 1, detection electric capacity 2, magnetorheological suspensions 3, magnetic field coil 4. The magnetorheological fluid 3 is placed in the non-magnetic container 1, and the volume of the magnetorheological fluid is half of that of the non-magnetic container 1. The detection capacitors 2 are arranged at the upper end and the lower end of the non-magnetic container, and the length of the polar plate is half of that of the non-magnetic container 1. The magnetic field coil 4 is disposed outside the non-magnetic container 1 to provide a magnetic field to the magnetorheological fluid 3. Wherein the non-magnetic container is a cuboid, and has a length a, a width b and a height c.
Referring to fig. 2, the signal conversion circuit is composed of a detection capacitance Cx, known resistances R1, R2, a feedback capacitance C1, known capacitances C2, C3, and an operational amplifier.
Referring to fig. 1, the tilt angle measurement scheme is:
when the non-magnetic container deflects at an angle along the reference direction, the proportion of media (air part and magnetorheological fluid part) in the detection capacitor changes, so that the detection capacitor changes.
The detection capacitance is the series value of the capacitance C1 and the capacitance C2, namely:
when the angle of inclination
When the temperature of the molten steel is very small,
therefore, the following are:
wherein
、
Respectively the dielectric constants of the magnetorheological fluid and air.
When in use
When the temperature of the molten steel is very small,
substituting the formulas (4) and (5) into the formula (1) and simplifying the reaction to obtain
Wherein
，
Is the relative dielectric constant of the magnetorheological fluid. When in use
And (6) the formula is simplified as follows:
wherein,
。
that is, the tilt angle can be obtained by detecting the capacitance. The magnetic field coil is used for providing a magnetic field for the magnetorheological fluid, and the magnetic field is adjusted to enable the detection capacitance and the inclination angle to be approximately in a linear relationship, and the detection capacitance can be adjusted to a certain degree, so that the sensitivity of the sensor is improved.
Referring to fig. 2, the detection capacitance measurement scheme is:
the circuit is input with a sinusoidal signal U0(t), a detected capacitor is excited by the sinusoidal signal U0(t), an exciting current is converted into an alternating voltage U1(t) through a detector consisting of a feedback resistor R1, a feedback capacitor C1 and an operational amplifier, and the circuit basic principle can be used for obtaining:
（9）
The circuit can realize effective detection of the tiny capacitor. Thereby further improving the sensitivity of the sensor.
Referring to fig. 3, when a is 0.1 m, b is 0.5 m, c is 0.01 m, and the inclination angle is changed between plus and minus 2 degrees, the change of the detection capacitance with the inclination angle is as shown in the figure. The detection capacitance is shown to range between 50 and 68 picofarads. The utility model discloses can obtain inclination minimum resolution is 0.01 degree.
The scope of protection of the invention is not limited to the above discussion but also includes the idea of the method and its variants.
Claims (1)
1. A micro inclination angle sensor based on magnetorheological fluid comprises an inclination angle testing device and a signal conversion circuit; it is characterized in that:
the inclination angle testing device consists of a non-magnetic container, a detection capacitor, a magnetic field coil and magnetorheological fluid; the magnetorheological fluid is placed in a non-magnetic container, and the volume of the magnetorheological fluid is half of that of the non-magnetic container; the detection capacitors are arranged at the upper end and the lower end of the non-magnetic container;
the signal conversion circuit consists of a proportional operation circuit consisting of a detection capacitor, a feedback resistor, a feedback capacitor and an operational amplifier; when in test, an alternating voltage signal is input into the circuit, and after the alternating voltage signal excites the proportional operation circuit, the change of the detection capacitor along with the inclination angle is converted into an alternating voltage signal; and calculating and processing the voltage signal by using an embedded system or a virtual instrument or a singlechip to obtain the size of the inclination angle of the non-magnetic container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120144392 CN202119389U (en) | 2011-05-09 | 2011-05-09 | Tiny inclination angle sensor based on magnetorheo-logical fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120144392 CN202119389U (en) | 2011-05-09 | 2011-05-09 | Tiny inclination angle sensor based on magnetorheo-logical fluid |
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| Publication Number | Publication Date |
|---|---|
| CN202119389U true CN202119389U (en) | 2012-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120144392 Expired - Fee Related CN202119389U (en) | 2011-05-09 | 2011-05-09 | Tiny inclination angle sensor based on magnetorheo-logical fluid |
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| CN (1) | CN202119389U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034455A (en) * | 2014-07-01 | 2014-09-10 | 重庆材料研究院有限公司 | Pressure sensor based on magnetorheological materials |
| CN104111484A (en) * | 2013-04-19 | 2014-10-22 | 中国石油集团长城钻探工程有限公司 | Platform for at least detecting three-dimensional array induction well logging tool radial coil flatness |
-
2011
- 2011-05-09 CN CN 201120144392 patent/CN202119389U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111484A (en) * | 2013-04-19 | 2014-10-22 | 中国石油集团长城钻探工程有限公司 | Platform for at least detecting three-dimensional array induction well logging tool radial coil flatness |
| CN104111484B (en) * | 2013-04-19 | 2018-09-25 | 中国石油集团长城钻探工程有限公司 | At least detect the platform of cubical array induction log tool radial coil flatness |
| CN104034455A (en) * | 2014-07-01 | 2014-09-10 | 重庆材料研究院有限公司 | Pressure sensor based on magnetorheological materials |
| CN104034455B (en) * | 2014-07-01 | 2016-01-06 | 重庆材料研究院有限公司 | Based on the pressure transducer of magnetorheological materials |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120118 Termination date: 20140509 |