CN102878916A - Device and method for measuring long stroke displacement based on Hall effect - Google Patents
Device and method for measuring long stroke displacement based on Hall effect Download PDFInfo
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Abstract
The invention belongs to the technical field of physical parameter measurement and relates to a device for measuring long stroke displacement based on the Hall effect. The device comprises a single chip microcomputer, a constant current source, a signal processing circuit, an analog-to-digital converter and a sensor array, wherein the sensor array is at least one group of linear hall sensors; each group of the linear hall sensors are uniformly and linearly arranged on a PCB (Printed Circuit Board); the space between the adjacent linear hall sensors is not less than the size of a magnet on a magnetic float in the arrangement direction of the sensor array; the differential outputs of the linear sensors are multiplexed with two differential voltage signal transmission lines through an n-channel analog multiplexer; the two differential voltage signal transmission lines are connected with an input interface of the signal processing circuit; the two adjacent PCBs are connected through an expansion interface; and each group of the linear hall sensors are powered by one same constant current source in a time sharing manner. The device has the advantages of low power consumption, fewer adopted devices, convenience in maintenance and lower cost.
Description
Technical field
The invention belongs to the physical parameters measurement technical field, relate to a kind of Hall effect displacement measurement mechanism and measuring method, relate in particular to a kind of Hall displacement measuring device and measuring method of growing the travel displacement measurement by linear hall sensor.
Background technology
The transmitter of magnetic float level indicator partly uses the tongue tube sensor at present.The part technical parameter of the transmitter of magnetic float level indicator:
Fluid density:＞0.4g/cm3,
Maximum range: 0-6m,
Resolution: ± 1cm,
Signal transmission form: (4-20) mA(two-wire system).
Magnetic float level indicator be a kind of to measuring accuracy have certain requirement (resolution: ± 1cm), but to require be not too high liquid level instrument, its price comparison is moderate.If higher to accuracy requirement, such as precision ± 1mm, then need to use other liquid level liquid level gauges, such as magnetostriction liquidometer, but its price is also relatively more expensive.
Switching value signal of each tongue tube output on the magnetic float level indicator will reach above-mentioned resolution, and every meter length needs artificial welding 100 tongue tubes (also need weld simultaneously 100 resistance), and production efficiency is low.In addition, tongue tube is frangible, in causing producing, instrument easily breaks down in Product transport and the installation process.Liquid level gauge manufacturer normal operation import tongue tube, price is relatively high.
Patent " Hall displacement measuring device and measuring method ", application number: 200910105137.2, proposed a kind of method of using Hall switch to measure displacement, although use Hall switch to be better than the tongue tube sensor at reduce trouble, its defective is also apparent:
1, Hall switch sensor and tongue tube are with the output switch amount, using Hall switch can not reduce the device usage quantity, is ± 1cm that measuring 1 meter length also needs 100 Hall switch sensors such as a minute ratio, add accessory circuit, whole measuring equipment circuit will be very complicated.
2, tongue tube is passive device, and metering circuit is simple, easily realizes elongated stripe shape equipment, and measurement range is large.Hall switch sensor is active device, adds accessory circuit, and measurement range senior general can't realize thin stripe type equipment.
3, use Hall switch sensor, increase along with measuring length, circuit complexity is multiplied, and its low-power consumption measuring method is with meaningless.
4, use Hall switch sensor, increase along with measuring length, circuit complexity is multiplied, and the measuring equipment cost will substantially exceed the use tongue tube, use limited.
Patented claim " long stroke linear displacement non-contact measuring device ", application number: 201210016996.6, a kind of method of using linear hall sensor to measure the permanent magnet straight-line displacement is proposed.It uses Fig. 6 linearity curve section 42 among the present invention to measure the permanent magnet position, when using two and a plurality of linear hall sensor to measure, need spacing between linear hall sensor less than magnet length, the displacement of linearity curve section 42 correspondences of linear hall sensor just can have intersection like this, and measuring method could realize.If adopt this kind measuring principle to realize long displacement measurement, or increase the magnet length of magnetic float, or need the number of sensors of use greatly to increase, but the former may cause and can't effectively measure, and the latter certainly will strengthen cost.
Summary of the invention
Deficiency in view of above-mentioned prior art exists the objective of the invention is for magnetic float level indicator, provides the device of a kind of low-power consumption, employing less, the long travel displacement measurement mechanism based on Hall effect easy to maintenance and lower-cost.Technical scheme of the present invention is as follows:
A kind of long travel displacement measurement mechanism based on Hall effect, comprise single-chip microcomputer, constant current source, signal processing circuit, analog to digital converter and sensor array, described sensor array is classified at least one group of linear hall sensor as, every group of even word of Hall element is arranged on the pcb board, adjacent linear hall sensor spacing is not less than the size of magnet in the sensor array orientation on the magnetic float, if the number of one group of linear hall sensor is n, the difference output of n linear transducer is by the multiplexing two differential voltage signal transmission lines of n tunnels analogy multiplexer; Two differential voltage signal transmission lines link to each other with the input interface of signal processing circuit; Two adjacent pcb boards link to each other by expansion interface; Each organizes linear hall sensor by same constant current source time sharing power supply, and the same time only has one group of n tunnels analogy multiplexer output voltage signal to the differential voltage signal transmission line, and other analog multiplexer output is in high-impedance state; Differential voltage signal is sent to single-chip microcomputer after converting digital quantity to by analog to digital converter after two difference transmission lines are transferred to signal processing circuit and carry out filter amplifying processing.
As preferred implementation, each the interior linear hall sensor of linear hall sensor group that uses the Multipexer selector switch to be chosen as same group is powered separately.
The measuring method that the present invention provides a kind of above-mentioned long travel displacement measurement mechanism to realize simultaneously, if consist of a sensor array by all linear hall sensors on one or more pcb boards, the spacing of two adjacent linear hall sensors is L, and this step comprises:
1) according to the distributing order of sensor array, establishes second sensor of sensor array for working as front sensor;
2) obtain with when the adjacent previous sensor of front sensor and after a sensor and the magnitude of voltage of itself, if three sensor voltage absolute values are all greater than setting threshold, and the absolute value of voltage of and previous sensor maximum when the absolute value of voltage of front sensor greater than after the absolute value of voltage of a sensor, judge that then magnetic float 0.5L before current sensing station finishes the judgement of magnetic float rough position with certain interior position; If three sensor voltage absolute values are all greater than threshold value, and the absolute value of voltage of and previous sensor maximum when the absolute value of voltage of front sensor less than after the absolute value of voltage of a sensor, judge that then magnetic float 0.5L after current sensing station finishes the judgement of magnetic float rough position with certain interior position;
3) according to step 2) method, whether the position of judging magnetic float before and after the current sensing station between the 0.5L, if in execution in step 4 then); Otherwise the next sensor that will work as front sensor is considered as working as front sensor, again judges; If the been scanned all the sensors still can't be judged the magnetic float rough position, return step 1);
4) the magnetic float rough position judge complete after, again carry out the voltage scanning collection, according to step 2) method, judge first magnetic float whether between the 0.5L distance of the front and back of current sensing station, if, this sensor is still for working as front sensor; If do not exist, whether judge magnetic float between the front and back 0.5L of the previous sensing station of front sensor distance, if, work as front sensor being made as when the previous sensor of front sensor; Otherwise judge magnetic float whether when the front and back 0.5L of a sensing station behind the front sensor apart between, if, sensor behind front sensor is made as works as front sensor; Repeat this step, finish the tracking of rough position in the static or displacement process of magnetic float and judge, otherwise return step 1);
5) rough position of at every turn judging magnetic float before and after certain sensor (i) between the 0.5L after, if judge that magnetic float is before this sensor (i) position, select the sensor output voltage value (V (i-1)) of the previous sensor of this sensor (i-1), utilize the relative position of magnetic float and sensor and the nonlinear relationship between the sensor output voltage value to carry out interpolation calculation, obtain the exact position of the relatively previous sensor of magnetic float 1 (i-1); If judge that magnetic float is after this sensing station, then select a rear sensor output voltage value (V(i+1)), utilize the relative position of magnetic float and sensor and the nonlinear relationship between the sensor output voltage value to carry out interpolation calculation, obtain the exact position of the relatively rear sensor of magnetic float, thereby calculate the exact position at magnetic float place.
Beneficial effect of the present invention is as follows:
Use linear hall sensor can reduce the instrument fault that causes because tongue tube is fragile.Utilization of the present invention is distributed in the metering system of the many groups linear hall sensor on a plurality of pcb boards, adopt simultaneously total line traffic control and transmission hall output voltage, in addition, on principle of work, the present invention chooses Hall element output voltage segment of curve 41 and segment of curve 43(Fig. 6), enlarge the measurement range of single linear hall element, thereby realized using linear hall sensor to measure the displacement of long stroke.Such as requiring resolution ± 1cm, measure 1 meter shift length, use tongue tube or switching Hall components, need 100 sensor components, if and the present invention is made as 8cm to linear hall sensor device spacing, then only need to use 13 linear hall sensors, therefore, the present invention can reduce components and parts welding quantity in the situation that satisfies the displacement of long stroke measurment magnetic float, improve magnetic float level indicator production efficiency and reduce liquid level gauge material and manufacturing cost.In addition, the single constant current source of use that invention proposes has reduced the power of device to the Hall element power supply with to the mode of metering circuit grouping time sharing power supply, and the device general power supply current can be less than 4mA.
Description of drawings
Fig. 1 is linear hall sensor structure of the present invention (left figure) and measures magnetic direction (right figure) synoptic diagram;
Fig. 2 is that the first linear hall sensor arrangement architecture of the present invention reaches and magnetic float position relationship synoptic diagram;
Fig. 3 is that the second linear hall sensor arrangement architecture of the present invention reaches and magnetic float position relationship synoptic diagram;
Fig. 4 is the metering circuit synoptic diagram that adopts the first power supply mode;
Fig. 5 is the metering circuit synoptic diagram that adopts the second power supply mode;
Fig. 6 is embodiment of the invention magnetic float and sensor relative position sensor output voltage values synoptic diagram;
Fig. 7 is that the embodiment of the invention is judged rough position and calculated exact position method synoptic diagram.
Embodiment
The present invention will be described below by embodiment and accompanying drawing, but the present invention is not limited thereto.
The present invention improves magnetic float level indicator, utilizes Hall effect to measure the displacement of long stroke magnetic float.Comprise a magnet in the magnetic float, thereby in each accompanying drawing of the present invention, express the magnetic direction of magnetic float with the magnetic direction of magnet.The present invention mainly comprises Sensor section and measurement section in two sub-sections, and the below introduces first Sensor section.
The sensor that the present invention adopts is the linear hall sensor array, and Fig. 1 has provided the pin definitions of the single linear hall sensor that adopts and measured the magnetic direction synoptic diagram.Left-half is the pin definitions synoptic diagram, INPUT+ and INPUT-are respectively the positive and negative input pins of linear hall sensor power supply, the linear hall sensor power supply can be that constant current source also can be constant pressure source, the constant current-supplying that the present invention uses, OUTPUT+ and OUTPUT-are linear hall sensor Voltage-output pins, its output difference component voltage.Right half part is to measure the magnetic direction synoptic diagram, if direction is identical therewith for magnetic direction, then linear hall sensor is exported positive voltage; If magnetic direction is opposite direction therewith, then linear hall sensor is exported negative voltage; Linear hall sensor output voltage size is directly proportional with magnetic field intensity.
Linear hall sensor of the present invention is linear array at the strip pcb board, Fig. 2 and Fig. 3 provide respectively a kind of Distribution of Magnetic Field of magnetic float and the position relationship between the linear hall sensor, and the magnet in the magnetic float 1 is for realizing arbitrary shape or the combination of this Distribution of Magnetic Field.Among Fig. 2, linear hall sensor 21 is arranged on the pcb board 2, arrangement pitches L, spacing L is not less than the size of magnet in the linear hall sensor orientation in the magnetic float 1, the N utmost point of magnetic float 1 is identical with linear hall sensor 21 orientations with S extreme direction, magnetic float 1 keeps constant distances with pcb board 2, moves forward and backward or static along linear hall sensor 21 orientations.It is vertical with linear hall sensor 21 orientations that linear hall sensor 21 is measured magnetic direction.There is expansion interface 22 at pcb board 2 two ends, measure length and can expand.Among Fig. 3, linear hall sensor 21 is arranged on the pcb board 2, arrangement pitches L, spacing L is not less than the size of magnet in the linear hall sensor orientation in the magnetic float 1, the N utmost point of magnetic float 1 is vertical with linear hall sensor 21 orientations with S extreme direction, magnetic float 1 keeps constant distances with pcb board 2, moves forward and backward or static along linear hall sensor 21 orientations.It is identical with linear hall sensor 21 orientations that linear hall sensor 21 is measured magnetic direction.There is expansion interface 22 at pcb board 2 two ends, measure length and can expand.
If the number of one group of linear hall sensor 21 is n, then n linear hall sensor 21 evenly arranged on pcb board, and spacing L is not less than the size of magnet in the linear hall sensor orientation in the magnetic float 1.Be 4cm such as the size of magnet in the linear hall sensor orientation in the magnetic float 1, linear hall sensor 21 arrangement pitches L can be 8cm, at the PCB two ends electric interfaces are arranged, but extension length.The differential voltage of output is by n tunnels analogy multiplexer 25 multiplexing two difference transmission lines.The n value can be: 32,16,8,4 or 2.
As shown in Figure 4 and Figure 5, metering circuit part of the present invention mainly is comprised of MCU31 single-chip microcomputer, constant current source 33, signal processing circuit 34, AD converter 35 and other circuit 32.Constant current source 33 provides unique shared constant current source to Sensor section.Give AD converter 35 after signal processing circuit 34 differential voltage signal bus voltage filter and amplifications etc. are processed, convert digital signal to MCU31.MCU provides control signal CS1, CS2 ... CSm and C1, C2 ... Ck.Other circuit comprise 420mA translation circuit etc.Fig. 4 and Fig. 5 have provided respectively the embodiment of two kinds of metering circuits.The power supply mode that Fig. 5 provides is the mode of a power supply in the same group of linear hall sensor just owing to adopted each, can increase supply current, can be used as preferred forms of the present invention.
Among Fig. 4, same group of linear hall sensor 21 arrays are emitted on the pcb board 2, and power pin is cascaded, by same constant current source power supply, and by switch 23 controls.These group linear hall sensor 21 output voltages are by on the analog multiplexer 25 rear multiplexing differential voltage buses, it is by control bus C1, C2 that analog multiplexer 25 selects which linear hall sensor 21 to output to the differential voltage bus ... Ck controls, for example: one group has 8 linear hall sensors, analog multiplexer can select 1 analog multiplexer with two 8, just selecting linear hall sensor output for one, select linear hall sensor output negative for one, control bus needs three: C1, C2 and C3.Analog multiplexer 25 power supplys are by switch 24 controls.Pcb board 2 can cascade, after the cascade, and shared bus.The switch 23 and 24 that linear hall sensor is corresponding is by CS1, CS2 ... CSm control.
The metering system of Fig. 5 with the difference of Fig. 4 is: every group of linear hall sensor 21 changed into the single linear hall sensor 21 that uses Multipexer selector switch 26 to be chosen as in every group by the series connection power supply and powered separately.Multipexer selector switch 26 and analog multiplexer 25 common sources and control signal: C1, C2 ... Ck.
Fig. 6 is that " magnetic float and sensor relative position sensor output voltage " concerns synoptic diagram.41 sections and 43 sections calculating magnetic floats of use curve of the present invention exact position.Process sensor 21 is sensing station with horizontal ordinate vertical dotted line and horizontal ordinate intersection point.Process magnetic float 1 center and horizontal ordinate vertical dotted line and horizontal ordinate intersection point are the magnetic float position, the magnitude of voltage that this dotted line is corresponding with curve intersection point is V, be magnetic float at current location sensor output voltage V, the position of the relative sensor of magnetic float is S1.
Measuring method:
Measure any linear hall sensor output voltage: the constant current source and the analog multiplexer power supply that enable the Hall element place group that to measure, the linear hall sensor that uses analog multiplexer channel selecting control bus gating to measure, this linear hall sensor output voltage outputs on the Hall voltage signal transmission bus by analog multiplexer, this voltage signal is by after the signal processing circuit, through the AD conversion, obtained by MCU.
As shown in Figure 6, magnetic float 1 from afar certain sensor in proximity transducer 21 arrays to away from this sensor, record magnetic float 1 and this sensor relative position S and this sensor output voltage value V, obtain " magnetic float and sensor relative position sensor output voltage values " one group of relation value, this relation value is applicable to arbitrary sensor on the pcb board.
Sensor output voltage explanation: magnetic float is when certain sensing station, and magnetic float equates apart from the distance of sensor before and after this sensor, so the opposite but identical voltage of absolute value of former and later two sensor output symbols of this sensor; As shown in Figure 7, magnetic float 1 is before this sensing station and distance during less than 0.5L, the previous sensor distance of magnetic float 1 and this sensor less than with the thereafter distance of a sensor, then front sensor output voltage absolute value | V (i-1) | greater than rear sensor output value | V (i+1) | and opposite in sign; Magnetic float after this sensing station and distance during less than 0.5L, behind magnetic float and this sensor sensor distance less than the distance of sensor previous with it, this afterwards sensor output voltage absolute value greater than front sensor output valve and opposite in sign.In the 0.5L, distance is nearest apart from this sensor before and after this sensing station for magnetic float, the magnitude of voltage absolute value of this sensor output | V (i) | and maximum.
Measuring process:
1) according to the distributing order of sensor array, establishes second sensor of sensor array for working as front sensor;
2) obtain with when the adjacent previous sensor of front sensor and after a sensor and the magnitude of voltage of itself, if three sensor voltage absolute values are all greater than setting threshold, and the absolute value of voltage of and previous sensor maximum when the absolute value of voltage of front sensor greater than after the absolute value of voltage of a sensor, judge that then magnetic float 0.5L before current sensing station finishes the location of magnetic float rough position with certain interior position; If three sensor voltage absolute values are all greater than threshold value, and the absolute value of voltage of and previous sensor maximum when the absolute value of voltage of front sensor less than after the absolute value of voltage of a sensor, judge that then magnetic float 0.5L after current sensing station finishes the judgement of magnetic float rough position with certain interior position;
3) according to step 2) method, whether the position of judging magnetic float before and after the current sensing station between the 0.5L, if in execution in step 4 then); Otherwise the next sensor that will work as front sensor is considered as working as front sensor, again judges; If the been scanned all the sensors still can't be judged the magnetic float rough position, return step 1);
4) behind the magnetic float rough position location, again carry out the voltage scanning collection, according to step 2) method, judge first magnetic float whether between the 0.5L distance of the front and back of current sensing station, if, this sensor is still for working as front sensor; If do not exist, whether judge magnetic float between the front and back 0.5L of the previous sensing station of front sensor distance, if, work as front sensor being made as when the previous sensor of front sensor; Otherwise judge magnetic float whether when the front and back 0.5L of a sensing station behind the front sensor apart between, if, sensor behind front sensor is made as works as front sensor; Repeat this step, finish the tracking of rough position in the static or displacement process of magnetic float and judge, otherwise return step 1);
5) rough position of at every turn judging magnetic float before and after certain sensor 21 (i) between 0.5L after, if judge that magnetic float is before this sensor 21 (i) position, as shown in Figure 7, use the previous sensor 21 of this sensor (i-1) output voltage V (i-1), in " magnetic float and sensor relative position sensor output voltage values " neutral line interpolation, obtain the exact position S2 of the relatively previous sensor 21 of magnetic float 1 (i-1).If judge that magnetic float is after this sensing station, then use the output voltage of a rear sensor, in " magnetic float and sensor relative position sensor output voltage values ", carry out interpolation calculation, obtain the exact position of the relatively rear sensor of magnetic float.Thereby calculate concrete exact position, float place.
Compare with patented claim 201210016996.6, use curve section 41 of the present invention and 43, the linear hall sensor arrangement pitches need to be greater than magnet length, and use linearity curve section 42 can't realize above-mentioned patent measuring method this moment. Use curve section 41 and 43 reason and advantage:
1, magnet accounts for the float weight large percentage in the magnetic float, low density liquid (such as: 0.4g/cm3) in the level gauging, the size of magnet is smaller in the linear hall sensor orientation in the magnetic float, if magnet size is large, the magnet preponderance, magnetic float does not get up floating, can't measure liquid level, magnet size is just larger at less linearity curve section 42 slopes of linear hall sensor orientation, the displaced segments of linearity curve section 42 correspondences is just less, the displacement that single linear hall sensor can be measured is just less, using this moment linearity curve section 42 to measure long travel displacement just needs a large amount of linear hall sensors, and the realization that the present invention measures will be very difficult.And the restriction of magnet size has been broken through in use curve section 41 and 43, has expanded the measurement range of single linear hall sensor, is conducive to the realization of measurement mechanism.
2, the present invention has expanded the measurement range of single linear hall sensor, the single linear hall sensor measurement range of the present invention can be more than 2 times of the single linear hall sensor measurement range of above-mentioned patent, reduced the usage quantity of linear hall sensor, be easy to realize large range measuring, reduce cost, such as the magnet that uses length 4cm, linear Hall array spacing of the present invention can reach 8cm, and foregoing invention linear Hall array spacing maximum possible can only be 3cm.
By relatively finding out, the present invention not only compares with Hall switch sensor the large advantage of the little measurement range of number of sensors of use, and compares the advantage that also has the little measurement range of use number of sensors large with the method for same use linear hall sensor measurement displacement.
Claims (3)
1. long travel displacement measurement mechanism based on Hall effect, comprise single-chip microcomputer, constant current source, signal processing circuit, analog to digital converter and sensor array, described sensor array is classified at least one group of linear hall sensor as, every group of even word of Hall element is arranged on the pcb board, adjacent linear hall sensor spacing is not less than the size of magnet in the sensor array orientation on the magnetic float, if the number of one group of linear hall sensor is n, the difference output of n linear transducer is by the multiplexing two differential voltage signal transmission lines of n tunnels analogy multiplexer; Two differential voltage signal transmission lines link to each other with the input interface of signal processing circuit; Two adjacent pcb boards link to each other by expansion interface; Each organizes linear hall sensor by same constant current source time sharing power supply, and the same time only has one group of n tunnels analogy multiplexer output voltage signal to the differential voltage signal transmission line, and other analog multiplexer output is in high-impedance state; Differential voltage signal is sent to single-chip microcomputer after converting digital quantity to by analog to digital converter after two difference transmission lines are transferred to signal processing circuit and carry out filter amplifying processing.
2. the long travel displacement measurement mechanism based on Hall effect according to claim 1 is characterized in that, each the interior linear hall sensor of linear hall sensor group that uses the Multipexer selector switch to be chosen as same group is powered separately.
3. measuring method that adopts long travel displacement measurement mechanism claimed in claim 1 to realize, if consist of a sensor array by all linear hall sensors on one or more pcb boards, the spacing of two adjacent linear hall sensors is L, and this step comprises:
1) according to the distributing order of sensor array, establishes second sensor of sensor array for working as front sensor;
2) obtain with when the adjacent previous sensor of front sensor and after a sensor and the magnitude of voltage of itself, if three sensor voltage absolute values are all greater than setting threshold, and the absolute value of voltage of and previous sensor maximum when the absolute value of voltage of front sensor greater than after the absolute value of voltage of a sensor, judge that then magnetic float 0.5L before current sensing station finishes the judgement of magnetic float rough position with certain interior position; If three sensor voltage absolute values are all greater than threshold value, and the absolute value of voltage of and previous sensor maximum when the absolute value of voltage of front sensor less than after the absolute value of voltage of a sensor, judge that then magnetic float 0.5L after current sensing station finishes the judgement of magnetic float rough position with certain interior position;
3) according to step 2) method, whether the position of judging magnetic float before and after the current sensing station between the 0.5L, if in execution in step 4 then); Otherwise the next sensor that will work as front sensor is considered as working as front sensor, again judges; If the been scanned all the sensors still can't be judged the magnetic float rough position, return step 1);
4) the magnetic float rough position judge complete after, again carry out the voltage scanning collection, according to step 2) method, judge first magnetic float whether between the 0.5L distance of the front and back of current sensing station, if, this sensor is still for working as front sensor; If do not exist, whether judge magnetic float between the front and back 0.5L of the previous sensing station of front sensor distance, if, work as front sensor being made as when the previous sensor of front sensor; Otherwise judge magnetic float whether when the front and back 0.5L of a sensing station behind the front sensor apart between, if, sensor behind front sensor is made as works as front sensor; Repeat this step, finish the tracking of rough position in the static or displacement process of magnetic float and judge, otherwise return step 1);
5) rough position of at every turn judging magnetic float before and after certain sensor (i) between the 0.5L after, if judge that magnetic float is before this sensor (i) position, select the sensor output voltage value (V (i-1)) of the previous sensor of this sensor (i-1), utilize the relative position of magnetic float and sensor and the nonlinear relationship between the sensor output voltage value to carry out interpolation calculation, obtain the exact position of the relatively previous sensor of magnetic float 1 (i-1); If judge that magnetic float is after this sensing station, then select a rear sensor output voltage value (V(i+1)), utilize the relative position of magnetic float and sensor and the nonlinear relationship between the sensor output voltage value to carry out interpolation calculation, obtain the exact position of the relatively rear sensor of magnetic float, thereby calculate the exact position at magnetic float place.
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