CN102121844B - Non-contact liquid level meter based on giant magneto-resistance sensors - Google Patents
Non-contact liquid level meter based on giant magneto-resistance sensors Download PDFInfo
- Publication number
- CN102121844B CN102121844B CN201010002023A CN201010002023A CN102121844B CN 102121844 B CN102121844 B CN 102121844B CN 201010002023 A CN201010002023 A CN 201010002023A CN 201010002023 A CN201010002023 A CN 201010002023A CN 102121844 B CN102121844 B CN 102121844B
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- Prior art keywords
- magnetic field
- giant magneto
- intensity
- level measuring
- corrosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
- G01F23/74—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means for sensing changes in level only at discrete points
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention provides a liquid level meter which comprises a corrosion-resistant tube (1), a ferromagnetic float (2), a strip circuit board (5) and a signal processing module (6), wherein the corrosion-resistant tube (1) is inserted into a container and comprises a small hole (3) communicated with the liquid in the container; the ferromagnetic float (2) is arranged in the corrosion-resistant tube and is magnetized in the vertical direction; a plurality of giant magneto-resistance sensors (4) are uniformly distributed in the vertical direction of the strip circuit board (5) and used for detecting the magnetic field of the ferromagnetic float (2); and the signal processing module (6) is coupled to the circuit board (5), magnetic field signals detected by the giant magneto-resistance sensors (4) are input to the signal processing module (6), two strongest magnetic field signals are extracted, and the liquid level position is obtained according to the positions of the giant magneto-resistance sensors (4) corresponding to the two signals and the strength of the two signals.
Description
Technical field
The present invention relates to level gauging, in particular to a kind of contactless fluid level measuring instrument based on giant magneto-resistance sensor.
Background technology
Fluid level measuring instrument has widely in a lot of fields to be used.Comprise locomotive fuel tank, boiler, oil and chemical industry, beverage, wastewater treatment, a lot of aspects such as solar water heater need the detection of liquid level.
Common in the market magnetic induction fluid level measuring instrument great majority are principles of utilizing magnetic float control tongue tube interior magnetic switch contact break-make or controlling the magnetic turnover panel.Because magnetic switch sensitivity commonly used is low, can only adopt logical and disconnected two states usually.This switching regulator fluid level measuring instrument can only detect the liquid level of one or several points usually.The resolution of liquid level is two parts of inductive scale of magnetic that patent adopted of CN2302506 and CN1351249 by the quantity decision of magnetic switch such as publication number.In addition, the fluid level measuring instrument of this magnetic switch formula need utilize the magnetic couplings between magnetic float and the magnetic switch, and this power that is coupling on the float to be produced causes the screens of float easily.In some cases, the liquid level of only knowing several points is not enough, needs the accurate measurement of real-time liquid level.Ultrasound wave and photoelectricity fluid level measuring instrument can be used to accurate measuring liquid level in the market.But the two installs comparatively complicated, and cost is higher.
Therefore, need fluid level measuring instrument a kind of accurately measuring liquid level, simple in structure, dependable performance.
Giant magneto-resistance sensor is the sensor that is used for detecting the magnetic field size.It is low that giant magneto-resistance sensor has a cost, and stability is high, characteristics such as sensitivity height.When one group of giant magneto-resistance sensor array and magnetic float combine, can utilize sensor to ferromagnetic float around the magnetic field size accurately calculate the position of liquid level.Because its high sensitivity characteristics, the resolution of the liquid level that this fluid level measuring instrument can detect is much smaller than the spacing between the sensor.Giant magneto-resistance sensor is because the magnetic part volume is very little, and the magnetic field that sensor itself produces does not almost have acting force to magnetic float, thereby is difficult for causing the float screens.This fluid level measuring instrument adopts contactless, and all electronic units use flexibly all in the container outside, and reliability is high.
Inventor of the present invention recognizes, can utilize giant magneto-resistance sensor to construct a kind of novel liquid level measuring instrument, to solve the problems referred to above that exist in the prior art.
Summary of the invention
First aspect of the present invention provides a kind of fluid level measuring instrument, comprising: be inserted into the corrosion-resistant pipe in the container, this corrosion-resistant pipe comprise with container in the aperture that communicates of liquid; Ferromagnetic float places in the corrosion-resistant pipe, and the in the vertical direction magnetization; The strip circuit board at the even some giant magneto-resistance sensors that distribute of the vertical direction of this strip circuit board, is used to detect the magnetic field of ferromagnetic float; And signal processing module; Be coupled to circuit board; Wherein the detected field signal of giant magneto-resistance sensor is input to signal processing module; Therefrom extract two field signals the strongest,, obtain liquid level position according to the position of these two pairing giant magneto-resistance sensors of signal and the intensity level of two signals.
Second aspect of the present invention provides a kind of level measuring method, comprising: the corrosion-resistant pipe that is inserted in the container is provided, this corrosion-resistant pipe comprise with container in the aperture that communicates of liquid; Ferromagnetic float is provided, places in the corrosion-resistant pipe, and the in the vertical direction magnetization; The strip circuit board is provided,, is used to detect the magnetic field of ferromagnetic float at the even some giant magneto-resistance sensors that distribute of the vertical direction of this strip circuit board; And from the detected field signal of giant magneto-resistance sensor, extract two field signals the strongest, according to the position of these two pairing giant magneto-resistance sensors of signal and the intensity level of two signals, obtain liquid level position.
Description of drawings
Fig. 1 shows the structure according to the fluid level measuring instrument of the embodiment of the invention.
Fig. 2 shows the structure according to the ferromagnetic float of the embodiment of the invention.
Embodiment
Below with reference to description of drawings general principle of the present invention.
Fig. 1 shows the structure according to the fluid level measuring instrument of the embodiment of the invention.As shown in Figure 1, comprise a corrosion-resistant pipe 1 that is inserted in the container according to the fluid level measuring instrument of the embodiment of the invention.Ferromagnetic float 2 of the inner placement of corrosion-resistant pipe, this ferromagnetic float can be the hollow bead that magnetic material is made.One end of this bead adds some weights 11, makes bead remain vertical direction 12 when floating on the liquid level, and promptly the DOM of bead is as shown in Figure 2.Like this, being positioned at the outer detected magnetic field of giant magneto-resistance sensor of container can not change because of the change of little direction of bowl.An aperture 3 that communicates with liquid is arranged at corrosion-resistant pipe bottom, guarantees that liquid level is equal in the inner liquid level of corrosion-resistant pipe 1 and the container.The shape of aperture 3 can be formed and make float can not leave corrosion-resistant pipe 1, for example, can be the circular hole of diameter less than float 2, or has the aperture of netted spacer.
Fluid level measuring instrument according to the embodiment of the invention also comprises a block length strip circuit plate 5, at the even some giant magneto-resistance sensors 4 that distribute of the vertical direction of circuit board.Interval between the sensor 4 is by the sensitivity decision of the magnetic field intensity of ferromagnetic float 2 and sensor 4, and principle is a ferromagnetic float 2 when being in the optional position, and guaranteeing has two giant magneto-resistance sensors 4 can measure enough strong signal.Usually, this is spaced apart several centimetres to tens centimetres.
Giant magneto-resistance sensor 4 detected field signals are input to signal processing module 6.This signal processing module 6 can be integrated on the circuit board 5.From the magnetic field intensity signal that giant magneto-resistance sensor 4 records, extract two signals the strongest; According to the position of these two pairing giant magneto-resistance sensors 4 of signal and the intensity level of two signals; Can obtain the coordinate of the vertical direction at ferromagnetic float 2 places, promptly liquid level position 9.
For example, suppose to be respectively z corresponding to the position coordinates of two sensors of high-intensity magnetic field signal
1And z
2, the magnetic field intensity that records is respectively B
1And B
2The liquid level coordinate is approximately so:
Perhaps; Can calculate the relation between liquid level position and sensing station and the magnetic field intensity through numerical simulation is carried out in the magnetic field of ferromagnetic float; Or obtain the relation between liquid level position and sensing station and the magnetic field intensity, thereby fluid level measuring instrument is demarcated through actual liquid level gauging.
Measurement result according to the fluid level measuring instrument of the embodiment of the invention can be as accurate as several millimeters even littler.
Signal processing module 6 is handled the liquid level position that obtains and can be connected to display module demonstration in real time or import automatic control system.
When container 8 was open-top receptacle, corrosion-resistant pipe 1 and circuit board 5 can utilize stilt 7 to be fixed together at the top, become one convenient the use.When container 8 was airtight container, corrosion-resistant pipe 1 can be separately fixed at container inner wall and outer wall with circuit board 5.
Although illustrated and explained the several exemplary embodiment of general plotting of the present invention, those skilled in the art will appreciate that under the situation of principle that does not deviate from general plotting of the present invention and spirit, can make change to these embodiment.The scope of general plotting of the present invention is limited accompanying claims and equivalents thereof.
Claims (14)
1. fluid level measuring instrument comprises:
Be inserted into the corrosion-resistant pipe (1) in the container, this corrosion-resistant pipe (1) comprise with container in the aperture (3) that communicates of liquid;
Ferromagnetic float (2) places in the corrosion-resistant pipe, and the in the vertical direction magnetization;
Strip circuit board (5) at the even some giant magneto-resistance sensors (4) that distribute of the vertical direction of this strip circuit board (5), is used to detect the magnetic field of ferromagnetic float (2); And
Signal processing module (6) is coupled to circuit board (5), wherein
The detected field signal of giant magneto-resistance sensor (4) is input to signal processing module (6); Therefrom extract two field signals the strongest; According to the position of these two pairing giant magneto-resistance sensors of signal (4) and the intensity level of two signals, obtain liquid level position (9).
2. fluid level measuring instrument according to claim 1; Wherein the interval between the giant magneto-resistance sensor (4) is by the magnetic field intensity of ferromagnetic float (2) and the sensitivity decision of giant magneto-resistance sensor (4); Make when ferromagnetic float (2) when being in the optional position, have at least two giant magneto-resistance sensors (4) can measure enough strong signal.
3. fluid level measuring instrument according to claim 1, wherein said ferromagnetic float are the hollow beads that magnetic material is processed, and are added with weight (11) at an end of said hollow bead.
4. fluid level measuring instrument according to claim 1 wherein is respectively z when the position coordinates corresponding to two giant magneto-resistance sensors (4) of two high-intensity magnetic field signals
1And z
2, the intensity level of two high-intensity magnetic field signals is respectively B
1And B
2The time, the coordinate of liquid level position (9) is:
5. fluid level measuring instrument according to claim 1; Wherein through the magnetic field of ferromagnetic float (2) being carried out numerical simulation is calculated the intensity level of liquid level position (9) and two high-intensity magnetic field signals and, thereby fluid level measuring instrument is demarcated corresponding to the relation between giant magneto-resistance sensor (4) position of two high-intensity magnetic field signals.
6. fluid level measuring instrument according to claim 1; Wherein obtain the intensity level of the high-intensity magnetic field signal of liquid level position (9) and two and corresponding to the relation between giant magneto-resistance sensor (4) position of two high-intensity magnetic field signals, thereby fluid level measuring instrument is demarcated through actual liquid level gauging.
7. fluid level measuring instrument according to claim 1, wherein said corrosion-resistant pipe (1) and circuit board (5) utilize stilt (7) to be fixed together at the top, and perhaps said corrosion-resistant pipe (1) and circuit board (5) are separately fixed at container inner wall and outer wall.
8. level measuring method comprises:
The corrosion-resistant pipe that is inserted in the container (1) is provided, this corrosion-resistant pipe (1) comprise with container in the aperture (3) that communicates of liquid;
Ferromagnetic float (2) is provided, places in the corrosion-resistant pipe, and the in the vertical direction magnetization;
Strip circuit board (5) is provided,, is used to detect the magnetic field of ferromagnetic float (2) at the even some giant magneto-resistance sensors (4) that distribute of the vertical direction of this strip circuit board (5); And
From the detected field signal of giant magneto-resistance sensor (4), extract two field signals the strongest,, obtain liquid level position according to the position of these two pairing giant magneto-resistance sensors of signal (4) and the intensity level of two signals.
9. level measuring method according to claim 8; Wherein the interval between the giant magneto-resistance sensor (4) is by the magnetic field intensity of ferromagnetic float (2) and the sensitivity decision of giant magneto-resistance sensor (4); Make when ferromagnetic float (2) when being in the optional position, have at least two giant magneto-resistance sensors (4) can measure enough strong signal.
10. level measuring method according to claim 8, wherein said ferromagnetic float are the hollow beads that magnetic material is processed, and are added with weight (11) at an end of said hollow bead.
11. level measuring method according to claim 8 wherein is respectively z when the position coordinates corresponding to two giant magneto-resistance sensors (4) of two high-intensity magnetic field signals
1And z
2, the intensity level of two high-intensity magnetic field signals is respectively B
1And B
2The time, the coordinate of liquid level position (9) is:
12. level measuring method according to claim 8; Wherein through the magnetic field of ferromagnetic float (2) being carried out numerical simulation is calculated the intensity level of liquid level position (9) and two high-intensity magnetic field signals and, thereby fluid level measuring instrument is demarcated corresponding to the relation between giant magneto-resistance sensor (4) position of two high-intensity magnetic field signals.
13. level measuring method according to claim 8; Wherein obtain the intensity level of the high-intensity magnetic field signal of liquid level position (9) and two and corresponding to the relation between giant magneto-resistance sensor (4) position of two high-intensity magnetic field signals, thereby fluid level measuring instrument is demarcated through actual liquid level gauging.
14. level measuring method according to claim 8, wherein said corrosion-resistant pipe (1) and circuit board (5) utilize stilt (7) to be fixed together at the top, and perhaps said corrosion-resistant pipe (1) and circuit board (5) are separately fixed at container inner wall and outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010002023A CN102121844B (en) | 2010-01-07 | 2010-01-07 | Non-contact liquid level meter based on giant magneto-resistance sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010002023A CN102121844B (en) | 2010-01-07 | 2010-01-07 | Non-contact liquid level meter based on giant magneto-resistance sensors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102121844A CN102121844A (en) | 2011-07-13 |
| CN102121844B true CN102121844B (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010002023A Expired - Fee Related CN102121844B (en) | 2010-01-07 | 2010-01-07 | Non-contact liquid level meter based on giant magneto-resistance sensors |
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| CN (1) | CN102121844B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017139960A1 (en) * | 2016-02-18 | 2017-08-24 | 东莞正扬电子机械有限公司 | Fluid level detection method and apparatus |
| CN107340036A (en) * | 2016-05-03 | 2017-11-10 | 贵州雅光电子科技股份有限公司 | A kind of New Liquid Level Transducer device and preparation method thereof |
| CN106092273B (en) * | 2016-08-11 | 2022-08-02 | 东莞正扬电子机械有限公司 | Liquid level detection method and liquid level sensor |
| CN107421606B (en) * | 2017-07-28 | 2024-01-26 | 珠海格力电器股份有限公司 | Liquid level detection device, detection method and water tank |
| CN109186818B (en) * | 2018-07-23 | 2020-11-27 | 天津大学 | Non-contact non-invasive pressure measurement method for pressure container |
| WO2020051876A1 (en) * | 2018-09-14 | 2020-03-19 | 深圳市大疆创新科技有限公司 | Liquid level measurement device, pesticide tank device and liquid filling device of unmanned aerial vehicle, and unmanned aerial vehicle |
| IT201900011880A1 (en) * | 2019-07-16 | 2021-01-16 | Dromont S P A | DOSING MACHINE FOR DOSING FLUID PRODUCTS SUCH AS DYES FOR PAINTS OR SIMILAR, WITH DEVICE FOR INDIVIDUAL MEASUREMENT OF THE LEVEL OF FLUID PRODUCTS |
| CN114508993B (en) * | 2020-11-16 | 2024-10-01 | 精量电子（深圳）有限公司 | Magneto-resistance displacement measuring device |
| CN117848459A (en) * | 2024-01-05 | 2024-04-09 | 西安博深安全科技股份有限公司 | Magnetic flap level meter and calibration method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447743A (en) * | 1982-04-28 | 1984-05-08 | The United States Of America As Represented By The United States Department Of Energy | High pressure liquid level monitor |
| US5874899A (en) * | 1998-02-06 | 1999-02-23 | Midland Manufacturing Corp. | Tank level gauge and sensor head therefor |
| CN2417464Y (en) * | 1999-11-22 | 2001-01-31 | 杭州中成机电技术有限公司 | Liquid level detecting device |
| CN2769862Y (en) * | 2005-03-04 | 2006-04-05 | 周毕华 | Radiation magnetic Hall liquid-level sensor |
| CN201463997U (en) * | 2008-12-10 | 2010-05-12 | 周淑芳 | Remote sensing type floater water-level gauge |
-
2010
- 2010-01-07 CN CN201010002023A patent/CN102121844B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447743A (en) * | 1982-04-28 | 1984-05-08 | The United States Of America As Represented By The United States Department Of Energy | High pressure liquid level monitor |
| US5874899A (en) * | 1998-02-06 | 1999-02-23 | Midland Manufacturing Corp. | Tank level gauge and sensor head therefor |
| CN2417464Y (en) * | 1999-11-22 | 2001-01-31 | 杭州中成机电技术有限公司 | Liquid level detecting device |
| CN2769862Y (en) * | 2005-03-04 | 2006-04-05 | 周毕华 | Radiation magnetic Hall liquid-level sensor |
| CN201463997U (en) * | 2008-12-10 | 2010-05-12 | 周淑芳 | Remote sensing type floater water-level gauge |
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| CN102121844A (en) | 2011-07-13 |
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Granted publication date: 20120829 Termination date: 20170107 |