CN100427901C - Dry calibrating method of inserted electromagnet flow meter sensor - Google Patents
Dry calibrating method of inserted electromagnet flow meter sensor Download PDFInfo
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- CN100427901C CN100427901C CNB2006101552851A CN200610155285A CN100427901C CN 100427901 C CN100427901 C CN 100427901C CN B2006101552851 A CNB2006101552851 A CN B2006101552851A CN 200610155285 A CN200610155285 A CN 200610155285A CN 100427901 C CN100427901 C CN 100427901C
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Abstract
The invention discloses plug in type electromagnetic flow meter transducer dry demarcating method. It includes the following steps: using electric drive displacement platform drive gauss meter probe to measure its external surface normal magnetic flux density; according to the external surface using computer to reconstruct periphery effective measuring space three dimensional magnetic field, further combine with transducer rectangular protractor and mathematical model to calculate its conversion coefficient. The invention can avoid high cost caused by actual flow demarcating, complex measuring in traditional method, realize plug in type electromagnetic flow meter transducer detecting and demarcating under the environment of different mediums and varieties of flow fields.
Description
Technical field
The present invention relates to be applied to the scaling method of electromagnetic flowmeter, especially relate to a kind of dried calibration method of inserted electromagnet flow meter sensor.
Background technology
Inserted electromagnet flow meter has special advantages in heavy caliber flow measurement field.At present, inserted electromagnet flow meter sensor adopts the real method of deciding of failing to be sold at auction more, sensor need be inserted and measure pipeline section, and make the liquid of actual flow finish its demarcation by measuring pipeline section.There are following three shortcomings in the method: 1) need build large-scale reality and fail to be sold at auction and decide device, wherein the reality of heavy caliber inserted electromagnet flow meter is failed to be sold at auction, and to decide device extremely expensive, and calibration cost is also very high; 2) real failing to be sold at auction decided device and had only a kind of measuring media usually, water for example, and the flow field that it produced also is the desirable flow field of development fully.But during on-the-spot the use, measuring media may not be a water, but mucus, slurries even multiphase medium etc., the flow field in the effective measurement space of sensor is not one to be decided to be the real desirable flow field regularly of failing to be sold at auction yet, and the therefore real sensor accuracy that draws surely of failing to be sold at auction can not be represented the on-the-spot realistic accuracy of using; 3) inserted electromagnet flow meter sensor requires to carry out demarcation again regularly usually, and real failing to be sold at auction decided device and do not possessed mobility, so user and producer need spend extra resource usually and sensor is transported to reality fails to be sold at auction and decide the device location and demarcate again from the scene.
The dried calibration method of inserted electromagnet flow meter sensor can be avoided the real fixed above shortcoming of failing to be sold at auction, need not real medium in the calibration process, its device manufacturing cost and calibration cost reduce greatly, device possesses mobility, can finish its demarcation at inserted electromagnet flow meter sensor use scene, do on the principle and demarcate the mode that adopts Theoretical Calculation, can finish the detection and the demarcation of inserted electromagnet flow meter sensor under different medium and the various flow fields environment.But traditional inserted electromagnet flow meter sensor dried calibration method requires to measure the three-dimensional magnetic field information in the effective measurement space of whole inserted electromagnet flow meter sensor, and under each point magnetic flux density direction condition of unknown, it is obviously unlikely to accomplish accurately to measure three-dimensional magnetic field information, and therefore traditional dried calibration method can't reach the requirement of industrial applications on precision.
Summary of the invention
The effectively measurement of the three-dimensional magnetic field of direction the unknown in the measurement space in traditional inserted electromagnet flow meter sensor dried calibration method, the object of the present invention is to provide a kind of dried calibration method of inserted electromagnet flow meter sensor, only need to measure the normal direction magnetic flux density of inserted electromagnet flow meter sensor outside surface, guaranteed the accuracy of measuring, and then the inserted electromagnet flow meter sensor dried calibration method that a kind of high precision is provided, can simulates different medium and various flow fields situation.
The technical solution adopted for the present invention to solve the technical problems is:
Adopt electricity driving displacement platform to drive the gaussmeter probe, the normal direction magnetic flux density of point-to-point measurement inserted electromagnet flow meter sensor outside surface, computing machine utilizes the peripheral effectively measurement space three-dimensional magnetic field of measured sensor outside surface Magnetic Field reconstruct sensor, go out the conversion coefficient of sensor further combined with sensor physical dimension and calculated with mathematical model, the high precision that realizes inserted electromagnet flow meter sensor is done and is demarcated.
Utilize the computer control electricity driving displacement platform to drive the gaussmeter probe, the normal direction magnetic flux density of point-to-point measurement inserted electromagnet flow meter sensor outside surface, the sensor outside surface comprises the face of cylinder and end face, when measuring face of cylinder normal direction magnetic flux density, the point tangential plane of measurement point is parallel on gaussmeter probe and the face of cylinder, when measuring end face normal direction magnetic flux density, the gaussmeter probe is parallel with end face.
Describe the peripheral effectively measurement space three-dimensional magnetic field of sensor with the scalar magnetic potential gesture, the scalar magnetic potential gesture satisfies Laplace's equation.Utilize the normal derivative of scalar magnetic potential gesture on the sensor outside surface, be that the normal direction magnetic flux density is a solving condition, find the solution the Laplace's equation of scalar magnetic potential gesture, make the peripheral effectively measurement space each point scalar magnetic potential gesture of sensor by solving condition, it is the unique decision of normal direction magnetic flux density on the sensor outside surface, thereby only need pass through the normal direction magnetic flux density on the survey sensor outside surface, just the peripheral effectively measurement space three-dimensional magnetic field of reconfigurable sensor.
Utilize milscale, vernier caliper measurement electrode position, electrode size, interelectrode distance and sensor outside surface size, be used to make up the space weighting function, and the three-dimensional magnetic field distribution character of combined reconstruction is determined the integration space.
Set up different mathematical model of flow field according to different medium and various flow fields situation, three-dimensional magnetic field model, the space weighting function of timing signal and reconstruct multiply each other, and in the whole effective measurement space that is determined by sensor outside surface size and Distribution of Magnetic Field characteristic, carry out integration, output voltage between the electrode of inserted electromagnet flow meter sensor under the unit's of obtaining flow velocity, can obtain the conversion coefficient of inserted electromagnet flow meter sensor, thereby realize the dried demarcation of inserted electromagnet flow meter sensor.
The present invention compares the beneficial effect that has with background technology: avoided the measurement of the three-dimensional magnetic field of direction the unknown in the peripheral effectively measurement space of sensor in the traditional inserted electromagnet flow meter sensor dried calibration method, only need the normal direction magnetic flux density of survey sensor outside surface, because the direction of the normal direction magnetic flux density of sensor outside surface is known, it is the normal direction of measurement point place face, therefore greatly facilitate measurement, guaranteed the accuracy of measuring, a kind of high precision is provided based on this, economical, can simulate the inserted electromagnet flow meter sensor dried calibration method of various flow fields situation.
Description of drawings
Fig. 1 is a structure principle chart of the present invention.
Fig. 2 is when measuring inserted electromagnet flow meter sensor face of cylinder normal direction magnetic flux density among the present invention, gaussmeter probe positions synoptic diagram.
Fig. 3 is when measuring inserted electromagnet flow meter sensor end face normal direction magnetic flux density among the present invention, gaussmeter probe positions synoptic diagram.
Among the figure: 1, gaussmeter probe, 2, connecting rod, 3, axle, 4, displacement platform, 5, controller, 6, gaussmeter instrument, 7, computing machine, 8, inserted electromagnet flow meter sensor, the 9 inserted electromagnet flow meter sensor faces of cylinder, 10, tangential plane, 11, normal direction, 12, the inserted electromagnet flow meter sensor end face.
Embodiment
The purpose of inserted electromagnet flow meter sensor dried calibration method is to obtain the conversion coefficient K of sensor
1, that is: under the unit flow velocity, the output voltage size of sensor electrical interpolar.According to the inserted electromagnet flow meter sensor theory, output voltage can be used formula (1) statement between electrode:
U＝∫(B×V)Wdτ (1)
In the formula: B---each point magnetic flux density in the peripheral effectively measurement space of sensor
Each point velocity of medium in the peripheral effectively measurement space of V---sensor
Each point weighting function in the peripheral effectively measurement space of W---sensor
τ---integration space, the i.e. peripheral effectively measurement space of sensor
As seen, if can know B, V, W expression formula, for example cylindrical coordinate (ρ, θ, z) the expression formula B under (ρ respectively with volume coordinate, θ, z), V (ρ, θ, z), W (ρ, θ z), just can ask for the size of output voltage between certain flow rate distribution lower sensor electrode easily, and then ask for K
1, realize the dried demarcation of sensor.Wherein: (ρ, θ z) can't accurately measure in traditional inserted electromagnet flow meter sensor dried calibration method B, can accomplish accurately to obtain by the present invention; (ρ, θ z) can require to decide, by the various flow fields of the change modeling of its mathematic(al) representation situation V according to different flow fields; (this coordinate points induction electromotive force is to the size of potential difference (PD) U role between two electrodes when z) representing sensor measurement for ρ, θ, and now existing mature theory is told about W (ρ, θ, z) expression formula of various typical inserted electromagnet flow meter sensors for W.In sum, the realization key of inserted electromagnet flow meter sensor dried calibration method is B (ρ, θ, accurately obtaining z).
Among the present invention, utilizing inserted electromagnet flow meter sensor peripheral space magnetic field is the characteristics of an irrotational field, describes the peripheral effectively measurement space three-dimensional magnetic field of sensor with the scalar magnetic potential gesture, and the scalar magnetic potential gesture satisfies Laplace's equation.Utilize the normal derivative of scalar magnetic potential gesture on the sensor outside surface, be that the normal direction magnetic flux density is a solving condition, find the solution the Laplace's equation of scalar magnetic potential gesture, make the peripheral effectively measurement space each point scalar magnetic potential gesture of sensor by solving condition, it is the unique decision of normal direction magnetic flux density on the sensor outside surface, thereby only need pass through the normal direction magnetic flux density on the survey sensor outside surface, just the peripheral effectively measurement space three-dimensional magnetic field of reconfigurable sensor.Therefore, at first need to measure pipe segment inner surface normal direction magnetic flux density.
Measuring method is as follows: as shown in Figure 1, head is equipped with gaussmeter probe 1, the gaussmeter instrument 6 of mini Hall sensor and connects both signal wire S1 composition magnetic-field measurement modules, and measuring accuracy is 0.1%.Have three straight signal wire S2 composition electricity driving displacement platforms that move displacement platform 4, the controller 5 of degree of freedom and a rotational freedom and connect both, directly moving bearing accuracy is 3 μ m, and the hoop bearing accuracy is 0.003 degree.Gaussmeter probe 1 is fixed on the displacement platform 4 by connecting rod 2, axle 3, and gaussmeter instrument 6, controller 5 link to each other with computing machine 7 by connection C1, C2 respectively.During work, computing machine 7 is by controller 5 control displacement platforms 4, drive gaussmeter probe 1 and finish the point-to-point measurement of whole inserted electromagnet flow meter sensor outside surface normal direction magnetic flux density, record data and be uploaded to computing machine 7 by connection C1 by gaussmeter instrument 6 with certain scanning pattern and step-length.Sampling time point when computing machine 7 can be measured by gaussmeter instrument 6 controlling magnetic field measurement modules, by the scanning pattern and the step-length of controller 5 control gaussmeter probes 1, the data that obtained comprise coordinate and this normal direction magnetic flux density of each measurement point.
Because the inserted electromagnet flow meter sensor outside surface comprises a face of cylinder and an end face, therefore need to measure respectively with regard to the normal direction magnetic flux density on the face of cylinder and the end face, the installation direction of gaussmeter probe 1 also should be done corresponding adjustment, when measuring end face normal direction magnetic flux density, the installation direction of gaussmeter probe 1 should be shown in Fig. 1 dotted line the position.Precision in order to ensure the method, sensing station should guarantee that it records data is the normal direction magnetic flux density in the measuring process: during the normal direction magnetic flux density of the survey sensor outside surface face of cylinder, should guarantee the dead in line of axle 3 and inserted electromagnet flow meter sensor 8, and should be as shown in Figure 2: guarantee that gaussmeter probe 1 is parallel with measurement point tangential plane 10 on the inserted electromagnet flow meter sensor face of cylinder 9, that is: make the normal direction 11 of measurement point on gaussmeter probe 1 and the inserted electromagnet flow meter sensor face of cylinder 9 vertical, allow sensor face of cylinder normal direction magnetic flux density vertically pass gaussmeter and pop one's head in 1; During survey sensor outside surface end face normal direction magnetic flux density, should guarantee that gaussmeter probe 1 is parallel with inserted electromagnet flow meter sensor end face 12 as shown in Figure 3, allow sensor end face normal direction magnetic flux density vertically pass gaussmeter probe 1.
After finishing the measurement of sensor outside surface normal direction magnetic flux density, computing machine 7 programs are solving condition with the sensor outside surface normal direction magnetic flux density that records, finish finding the solution of scalar magnetic potential gesture Laplace's equation, obtain the magnetic flux distribution function B (ρ of each point in the peripheral effectively measurement space of sensor, θ, z), thus finish the reconstruct of three-dimensional magnetic field.
After finishing three-dimensional magnetic field reconstruct, utilize milscale, vernier caliper measurement electrode position, electrode size, interelectrode distance and sensor outside surface size.Measure gained data input computing machine 7, computing machine 7 will utilize gained physical dimension data construct space weighting function W, and (ρ, θ z), and the three-dimensional magnetic field distribution character of combined reconstruction, determine the integration space τ of formula (1), i.e. effective measurement space.
In addition, can select different medium and various flow fields situation by computing machine 7, computing machine 7 will select for use corresponding space flow speed distribution mathematical model to be used for calculating automatically.
At last, computing machine 7 by formula (1) with B (ρ, θ, z), V (ρ, θ, z), (ρ, θ's W z) multiply each other, and carry out integration on the τ of integration space, obtain output voltage between the inserted electromagnet flow meter sensor electrode.Further obtain the inserted electromagnet flow meter sensor conversion coefficient K
1Thereby, realize the dried demarcation of inserted electromagnet flow meter sensor.
Claims (4)
1, a kind of dried calibration method of inserted electromagnet flow meter sensor, it is characterized in that: adopt electricity driving displacement platform to drive the gaussmeter probe, the normal direction magnetic flux density of point-to-point measurement inserted electromagnet flow meter sensor outside surface, computing machine utilizes the peripheral effectively measurement space three-dimensional magnetic field of measured sensor outside surface Magnetic Field reconstruct sensor, go out the conversion coefficient of sensor further combined with sensor physical dimension and calculated with mathematical model, set up different mathematical model of flow field according to different medium and various flow fields situation, the three-dimensional magnetic field model of timing signal and reconstruct, the space weighting function multiplies each other, and in the whole effective measurement space that is determined by sensor outside surface size and Distribution of Magnetic Field characteristic, carry out integration, output voltage between the electrode of inserted electromagnet flow meter sensor under the unit's of obtaining flow velocity, can obtain the conversion coefficient of inserted electromagnet flow meter sensor, realize that the high precision of inserted electromagnet flow meter sensor is done demarcation.
2, the dried calibration method of a kind of inserted electromagnet flow meter sensor according to claim 1, it is characterized in that: utilize the computer control electricity driving displacement platform to drive the gaussmeter probe, the normal direction magnetic flux density of point-to-point measurement inserted electromagnet flow meter sensor outside surface, the sensor outside surface comprises the face of cylinder and end face, when measuring face of cylinder normal direction magnetic flux density, the point tangential plane of measurement point is parallel on gaussmeter probe and the face of cylinder, when measuring end face normal direction magnetic flux density, the gaussmeter probe is parallel with end face.
3, the dried calibration method of a kind of inserted electromagnet flow meter sensor according to claim 1, it is characterized in that: describe the peripheral effectively measurement space three-dimensional magnetic field of sensor with the scalar magnetic potential gesture, the scalar magnetic potential gesture satisfies Laplace's equation, utilize the normal derivative of scalar magnetic potential gesture on the sensor outside surface, be that the normal direction magnetic flux density is a solving condition, find the solution the Laplace's equation of scalar magnetic potential gesture, make the peripheral effectively measurement space each point scalar magnetic potential gesture of sensor by solving condition, it is the unique decision of normal direction magnetic flux density on the sensor outside surface, thereby only need pass through the normal direction magnetic flux density on the survey sensor outside surface, just the peripheral effectively measurement space three-dimensional magnetic field of reconfigurable sensor.
4, the dried calibration method of a kind of inserted electromagnet flow meter sensor according to claim 1, it is characterized in that: utilize milscale, vernier caliper measurement electrode position, electrode size, interelectrode distance and sensor outside surface size, be used to make up the space weighting function, and the three-dimensional magnetic field distribution character of combined reconstruction is determined the integration space.
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| CNB2006101552851A CN100427901C (en) | 2006-12-18 | 2006-12-18 | Dry calibrating method of inserted electromagnet flow meter sensor |
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| CNB2006101552851A CN100427901C (en) | 2006-12-18 | 2006-12-18 | Dry calibrating method of inserted electromagnet flow meter sensor |
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| CN100427901C true CN100427901C (en) | 2008-10-22 |
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| CN101377427B (en) * | 2008-10-07 | 2010-06-09 | 浙江大学 | Method and device for measuring weighting function of electromagnetic flowmeter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3550426A (en) * | 1969-03-18 | 1970-12-29 | Rotron Inc | Fluid meter field checking method and apparatus |
| US5231883A (en) * | 1990-12-24 | 1993-08-03 | The United States Of America As Represented By The Secretary Of The Navy | Transient flowmeter calibration facility |
| CN1629609A (en) * | 2003-12-18 | 2005-06-22 | 承德市本特万达仪表有限公司 | Plug-in electromagnetic flowmeter sensor |
-
2006
- 2006-12-18 CN CNB2006101552851A patent/CN100427901C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3550426A (en) * | 1969-03-18 | 1970-12-29 | Rotron Inc | Fluid meter field checking method and apparatus |
| US5231883A (en) * | 1990-12-24 | 1993-08-03 | The United States Of America As Represented By The Secretary Of The Navy | Transient flowmeter calibration facility |
| CN1629609A (en) * | 2003-12-18 | 2005-06-22 | 承德市本特万达仪表有限公司 | Plug-in electromagnetic flowmeter sensor |
Non-Patent Citations (2)
| Title |
|---|
| 电磁流量计的理论模型及其在干标定上的应用. 张小章.南京航空航天大学学报，第22卷第1期. 1990 |
| 电磁流量计的理论模型及其在干标定上的应用. 张小章.南京航空航天大学学报，第22卷第1期. 1990 * |
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