CN1246677C - Self-rating and temperature-drift-removable magnetostriction level sensor - Google Patents
Self-rating and temperature-drift-removable magnetostriction level sensor Download PDFInfo
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- CN1246677C CN1246677C CN 03130208 CN03130208A CN1246677C CN 1246677 C CN1246677 C CN 1246677C CN 03130208 CN03130208 CN 03130208 CN 03130208 A CN03130208 A CN 03130208A CN 1246677 C CN1246677 C CN 1246677C
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- liquid level
- float
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Abstract
The present invention discloses a self-rating and temperature-drift-removable magnetostriction liquid level sensor which belongs to liquid level detection technology. The self-rating and temperature-drift-removable magnetostriction liquid level sensor is composed of a waveguide wire, a waveguide tube, a liquid level float, etc. The present invention is characterized in that the annular space of the waveguide wire and the waveguide tube is additionally provided with at least one auxiliary magnetic float; distance L#-[0] between the auxiliary float and an exciting pulse applying point in a sensor head is ascertained, or the distance L#-[0] between two adjacent auxiliary floats is ascertained; thus, when liquid levels are measured by the self-rating and temperature-drift-removable magnetostriction liquid level sensor, the count pulse number N of the liquid level float and the count pulse number N#-[0] from the auxiliary float to the exciting pulse applying point or between two auxiliary floats can be simultaneously measured. According to liquid level distance Lx=(L#-[0]/N#-[0]) N, L#-[0]/N#-[0] is the proportionality coefficient C#-[0] between a liquid level and time, the self-rating of the proportionality coefficient of the liquid level and time is achieved and temperature-drift measurement error is counteracted. The present invention has the advantages of enhancement of the measuring accuracy of a magnetostriction liquid level sensor, simple structure, high reliability and convenient use.
Description
Technical field
The present invention relates to a kind of the demarcation certainly and temperature-drift-removable magnetostrictive liquid level sensor, belong to the Level Detection technology.
Background technology
Magnetostrictive liquid level sensor utilizes Wiedemann (Wiedemann) effect, Villari (Viuary) effect and the ultrasonic effect of intellectual material, realizes the superhigh precision metering to liquid level, position, boundary, and its Measurement Resolution can reach even be better than 0.1mm.Because magnetostrictive liquid level sensor does not almost have movable mechanical part,, be one of the big jar of current optimal contact-type liquid level emasuring device in addition so have reliability height, characteristics such as convenient for installation and maintenance, applied widely.Obtained application more and more widely in refinery, oil depot, oil product harbour and refuelling station.
Sensor is that a kind of physical signalling is converted to the corresponding with it another kind equipment of the physical signalling of measurement easily.And magnetostrictive liquid level sensor is that the liquid level information translation is become time quantum.Because time quantum is the easiest physical quantity of carrying out high-acruracy survey, it has very high measuring accuracy.Its minimum Measurement Resolution, only relevant in theory with the accuracy of timekeeping of system.In real system, timing often realizes by the number of oscillation of metering crystal oscillator.And the oscillation frequency of crystal oscillator can produce certain drift with the variation of environment temperature.When range of temperature is big, thisly float the minimum resolution that the measuring error that causes will substantially exceed magnetostrictive liquid level sensor by crystal oscillator oscillation frequency temperature, make measurement result bigger error occur.Magnetostrictive liquid level sensor is the equipment that level value is converted to time value in addition, though and the corresponding relation of liquid level and time is linear.But its scale-up factor is the function about physical quantitys such as waveguide filament density, material, stress, temperature.Therefore this scale-up factor is to need to demarcate, and the way of now generally taking is before sensor dispatches from the factory this coefficient to be demarcated a fixed value.Yet variation has taken place in the runtime environment condition at the scene, and this scale-up factor also should adjust accordingly.Therefore the method that adopts fixed value to demarcate will be brought certain error to measurement result.
Float the measuring error that causes for the crystal oscillator temperature, though can be cut down by the method that adopts temperature compensating crystal oscillator, the method for this passive compensation just reduces the negative effect that temperature is floated as far as possible, can not thoroughly eliminate the measuring error that it causes.Simultaneously since the temperature compensating crystal oscillator volume big, cost an arm and a leg, therefore less at the such volume of liquid level sensor, seldom adopt in the equipment of cost control strictness.And for the error that liquid level-fluctuation of time scale coefficient causes, went back the good method of neither one in the past and eliminated.
Because the existence of above two kinds of factors makes the magnetostrictive liquid level sensor measuring accuracy in actual applications that can realize the superhigh precision measurement originally have a greatly reduced quality.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of existing magnetostrictive liquid level sensor, provide a kind of from demarcating and eliminate the magnetostrictive liquid level sensor that temperature is floated.This sensor has from the function of demarcating and the elimination temperature is floated, level gauging precision height, and usable range is wide.
The present invention is realized by following technical proposals: comprise the magnetostrictive liquid level sensor that sensor head (including single-chip computer control system), magnetostrictive waveguide silk, waveguide, liquid level float (including magnet), auxiliary float (including magnet) constitute; It is characterized in that, between the annular space of waveguide filament and waveguide, add at least one auxiliary float, and determine simultaneously accurately the distance L between the driving pulse application point of auxiliary float to the sensor head
0, or the distance L between accurately definite adjacent two auxiliary floats
0Thereby, when using this sensor that liquid level is measured, can record liquid level float count pulse number N and auxiliary float simultaneously to the count pulse number N between driving pulse application point or adjacent two the auxiliary floats
0. according to liquid level distance L x=(L
0/ N
0) N, then L
0/ N
0Be the scale-up factor C of liquid level-time
0This scale-up factor C
0Change " dynamically " scale-up factor with test environment conditions, thereby realized the demarcation certainly of sensor.Again because the crystal oscillator temperature is floated the correlation N that can float coefficient by temperature
t=eN
T0Express.In the formula: N
tCount pulse number during for temperature t; N
T0Count pulse number during for reference temperature; The calculating formula of calculating liquid level Lx value has comprised N
T0/ N
t, then be contained in N
T0And N
tIn temperature float coefficient and offset.
Above-mentioned auxiliary float is the block float that includes magnet, or includes the concentric float of magnet.
Above-mentioned auxiliary float number is 1 or 2 or 3 or 4
Of the present invention from demarcating and eliminating the magnetostrictive liquid level sensor that temperature is floated, its characteristics are mainly reflected in:
1, online dynamic acquisition liquid level-time scale coefficient makes magnetostrictive liquid level sensor have adaptive ability to environmental change.Eliminated level gauging error effectively by liquid level-fluctuation of time scale coefficient causes.
2, eliminated effectively by crystal oscillator oscillation frequency temperature and floated the measuring error that causes.
3, saved the sensor fixed production stage of rower that advances that dispatches from the factory.
4, only on the basis of original system, increase one or more auxiliary floats, simple in structure, realize easily.
5, do not increase the moving machinery parts of sensor, property is leaned on by not reduction system.
Description of drawings
Fig. 1 is the structural representation of the present invention of single auxiliary float
Fig. 2 is the pulse synoptic diagram of the present invention of single auxiliary float
Fig. 3 is the structural representation of the present invention of two auxiliary floats
Fig. 4 is the pulse synoptic diagram of the present invention of two auxiliary floats
Among the figure, 1 is sensor head, and 2 are the pulse excitation application point, 3 are auxiliary float 1,4 is waveguide, and 5 is the liquid level float, and 6 is liquid level float internal magnet, 7 is waveguide filament, 8 for auxiliary float 2,9 is a driving pulse, and 10 is the signal pulse that auxiliary float 1 causes, 11 signal pulses that cause for the liquid level float, 12 signal pulses that cause for auxiliary float 2.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Embodiment 1:
As Fig. 1, shown in Figure 2: magnetostrictive liquid level sensor is made up of sensor head 1, waveguide 4, waveguide filament 7, liquid level float 5 and liquid level float internal magnet 6 etc.In the waveguide of magnetostrictive liquid level sensor, between waveguide filament and the waveguide, add an auxiliary float 3, and accurately determine the distance L of 2 of the driving pulse application point of auxiliary float to the sensor head
0, when liquid level sensor is put into liquid tank, when carrying out level gauging, sensor also can record the count pulse number N of auxiliary float except recording the liquid level count pulse number N corresponding with level value like this
0Because magnetostrictive liquid level sensor has the high linearity, so L
0, N
0, satisfy following relation between N and the liquid level distance L x: Lx=(L
0/ N
0) N, wherein L
0/ N
0Be liquid level-time scale coefficient C
0When environmental baseline changes, C
0Also will change, but L
0, N
0, the linear relationship between N and the Lx still exists, so C
0Still can pass through L
0/ N
0Obtain.Sensor is as long as all measure and calculate C earlier when each level gauging like this
0, and then multiply by the liquid level count pulse number N that records, just obtain concrete level value.Thereby eliminated by C
0The measuring error that fluctuation causes.And the crystal oscillator temperature floats and can float coefficient e by temperature and embody, i.e. N
t=eN
T0(N
tCount pulse number during for temperature t; N
T0Be reference temperature t
0The time the count pulse number).Because in the formula that calculates Lx, comprised N
0/ N item is so be included in N
0Floating coefficient with the temperature among the N cancels out each other.So can also eliminating effectively by crystal oscillator oscillation frequency temperature, this method floats the measuring error that causes.
Embodiment 2:
As Fig. 3, shown in Figure 4: as on the basis of the foregoing description 1, to be respectively L apart from the return signal of auxiliary 8, two auxiliary magnets of float of first auxiliary float Lo place increase and the time interval of excitation pulse signal
O1, L
O2, this moment liquid level-time scale coefficient C
0=L
0/ (N
02-N
01), and Lx=C
0N., adopt the method for two auxiliary floats can overcome in single auxiliary float method, because of auxiliary float overlaps with the liquid level float position, and the drawback that the pulse that causes can't be distinguished.
The present invention all combinations and method open and that disclose can be by using for reference this paper disclosure, although combination of the present invention and method are described by preferred embodiment, but those skilled in the art obviously can be spliced method and apparatus as herein described in not breaking away from content of the present invention, spirit and scope or change, or increase and decrease some parts, more particularly, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (3)
1. demarcate certainly and temperature-drift-removable magnetostrictive liquid level sensor for one kind, this sensor comprises that sensor head, magnetostrictive waveguide silk, waveguide, liquid level float, auxiliary float constitute, it is characterized in that: between the annular space of waveguide filament and waveguide, add at least one auxiliary float, and determine simultaneously accurately the distance L between the driving pulse application point of auxiliary float to the sensor head
0, or the distance L between accurately definite adjacent two auxiliary floats
0Thereby, when using this sensor that liquid level is measured, can record liquid level float count pulse number N and auxiliary float simultaneously to the count pulse number N between driving pulse application point or adjacent two the auxiliary floats
0, according to liquid level distance L x=(L
0/ N
0) N, then L
0/ N
0Be the scale-up factor C of liquid level-time
0This scale-up factor C
0Change " dynamically " scale-up factor with test environment conditions, realized the demarcation certainly of sensor, again because the crystal oscillator temperature is floated the correlation N that can float coefficient by temperature
t=eN
T0Express, in the formula: N
tCount pulse number during for temperature t; N
T0Count pulse number during for reference temperature; The calculating formula of calculating liquid level Lx value has comprised N
T0/ N
t, then be contained in N
T0And N
tIn temperature float coefficient and offset.
2. described from demarcating and temperature-drift-removable magnetostrictive liquid level sensor by claim 1, it is characterized in that: auxiliary float is the block float that includes magnet, or includes the concentric float of magnet.
3. described from demarcating and temperature-drift-removable magnetostrictive liquid level sensor by claim 1, it is characterized in that: auxiliary float number is 1 or 2 or 3 or 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130208 CN1246677C (en) | 2003-06-20 | 2003-06-20 | Self-rating and temperature-drift-removable magnetostriction level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130208 CN1246677C (en) | 2003-06-20 | 2003-06-20 | Self-rating and temperature-drift-removable magnetostriction level sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1470853A CN1470853A (en) | 2004-01-28 |
| CN1246677C true CN1246677C (en) | 2006-03-22 |
Family
ID=34153688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03130208 Expired - Fee Related CN1246677C (en) | 2003-06-20 | 2003-06-20 | Self-rating and temperature-drift-removable magnetostriction level sensor |
Country Status (1)
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| CN (1) | CN1246677C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102478649A (en) * | 2010-11-26 | 2012-05-30 | 益科博能源科技（上海）有限公司 | Measuring method of rotating potentiometer |
| CN102445254A (en) * | 2011-12-19 | 2012-05-09 | 北京京仪海福尔自动化仪表有限公司 | Device for measuring liquid level in tracking mode |
| CN103486958B (en) * | 2013-09-30 | 2016-03-23 | 湖南宇航科技有限公司 | The tension installation method of a kind of magnetostrictive displacement sensor and waveguide filament thereof |
| CN110686752B (en) * | 2019-10-21 | 2020-09-25 | 江苏新晖测控科技有限公司 | Box liquid level meter for measuring position by utilizing water flow oscillation |
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2003
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| Publication number | Publication date |
|---|---|
| CN1470853A (en) | 2004-01-28 |
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