CN102878916B - 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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- CN102878916B CN102878916B CN201210316714.4A CN201210316714A CN102878916B CN 102878916 B CN102878916 B CN 102878916B CN 201210316714 A CN201210316714 A CN 201210316714A CN 102878916 B CN102878916 B CN 102878916B
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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 physical parameters measurement technical field, relate to a kind of Hall effect displacement measurement mechanism and measuring method, particularly relate to a kind of Hall displacement measuring device and measuring method of being carried out Long travel displacement measurement by linear hall sensor.
Background technology
The transducer portion of current magnetic float level indicator uses tongue tube sensor.The portion of techniques 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 is that one there are certain requirements (resolution: ± 1cm) measuring accuracy, but requires it is not too high liquid level instrument, and its price comparison is moderate.If higher to accuracy requirement, as precision ± 1mm, then need to use other liquid level liquid level gauge, such as magnetostriction liquidometers, but its price also costly.
Each tongue tube on magnetic float level indicator exports an on-off model, reach above-mentioned resolution, and every meter of length needs human weld's 100 tongue tubes (simultaneously also needing welding 100 resistance), and production efficiency is low.In addition, tongue tube is frangible, and in causing producing, in Product transport and installation process, instrument easily breaks down.Liquid level gauge manufacturer generally uses import tongue tube, and price is relatively high.
Patent " Hall displacement measuring device and measuring method ", application number: 200910105137.2, propose a kind of method using Hall switch to measure displacement, although use Hall switch to be better than tongue tube sensor in reduction failure rate, its defect is also apparent:
1, Hall switch sensor and tongue tube are with output switch amount, use Hall switch can not reduce device usage quantity, such as divide ratio to be ± 1cm, measuring 1 meter of length also needs 100 Hall switch sensors, add accessory circuit, whole measuring equipment circuit will be very complicated.
2, tongue tube is passive device, and metering circuit is simple, and easily realize elongated stripe shape equipment, measurement range is large.Hall switch sensor is active device, adds accessory circuit, and measurement range senior general cannot realize thin stripe type equipment.
3, use Hall switch sensor, along with measurement length increases, circuit complexity is multiplied, and its low-power consumption measuring method is by meaningless.
4, use Hall switch sensor, along with measurement length increases, circuit complexity is multiplied, and measuring equipment cost will substantially exceed use tongue tube, applies limited.
Patented claim " long-stroke linear displacement non-contact measuring device ", application number: 201210016996.6, proposes a kind of method using linear hall sensor to measure permanent magnet straight-line displacement.It uses Fig. 6 linearity curve section 42 in the present invention to carry out measurement permanent magnet position, when using two and the measurement of multiple linear hall sensor, the spacing between linear hall sensor is needed to be less than magnet length, the displacement of linearity curve section 42 correspondence of such front and back linear hall sensor just can have intersection, and measuring method could realize.If adopt this kind of measuring principle to realize long displacement measurement, or increase the magnet length of magnetic float, or need the number of sensors used greatly to increase, but the former may cause effectively measuring, and the latter certainly will strengthen cost.
Summary of the invention
In view of the deficiency that above-mentioned prior art exists, the object of the invention is for magnetic float level indicator, less, the easy to maintenance and lower-cost Long travel displacement measuring device based on Hall effect of device of a kind of low-power consumption, employing is provided.Technical scheme of the present invention is as follows:
A kind of Long travel displacement measuring device 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 as at least one group of linear hall sensor, often organizing the even word of Hall element is arranged on a pcb board, adjacent linear hall sensor spacing is not less than the size of magnet in sensor array orientation on 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 channel analog multiplexer, two differential voltage signal transmission lines are connected with the input interface of signal processing circuit, two adjacent pcb boards are connected by expansion interface, each group of linear hall sensor is by same constant current source time sharing power supply, and the same time only has one group of n channel analog multiplexer output voltage signal on differential voltage signal transmission line, and other analog multiplexer exports and is in high-impedance state, differential voltage signal is transferred to after signal processing circuit carries out filter amplifying processing through two difference transmission lines, is sent to single-chip microcomputer after converting digital quantity to by analog to digital converter.
Preferably, each linear hall sensor using Multipexer selector switch to be chosen as in the linear hall sensor group of same group is powered separately.
The measuring method that the present invention provides a kind of above-mentioned Long travel displacement measuring device to realize simultaneously, if form 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, if second of sensor array sensor is current sensor;
2) the previous sensor adjacent with current sensor and a rear sensor and the magnitude of voltage of itself is obtained, if three sensor voltage absolute values are all greater than setting threshold value, and the maximum and absolute value of voltage that is previous sensor of the absolute value of voltage of current sensor is greater than the absolute value of voltage of a rear sensor, then judge magnetic float certain position before current sensor position within 0.5L, terminate the judgement of magnetic float rough position; If three sensor voltage absolute values are all greater than threshold value, and the maximum and absolute value of voltage that is previous sensor of the absolute value of voltage of current sensor is less than the absolute value of voltage of a rear sensor, then judge magnetic float certain position after current sensor position within 0.5L, terminate the judgement of magnetic float rough position;
3) according to step 2) method, whether the position judging magnetic float before and after current sensor position between 0.5L, if; would perform step 4); Otherwise the next sensor of current sensor is considered as current sensor, again judges; If scanned all the sensors still cannot judge magnetic float rough position, return step 1);
4), after magnetic float rough position judges, again voltage scanning collection is carried out, according to step 2) method, first judge that magnetic float is whether between the front and back 0.5L distance of current sensor position, if, this sensor is still current sensor; If do not exist, judge magnetic float whether between the front and back 0.5L distance of the previous sensing station of current sensor, if, previous for current sensor sensor is set to current sensor; Otherwise judge magnetic float whether after current sensor a sensing station front and back 0.5L distance between, if, a sensor after current sensor is set to current sensor; Repeat this step, the tracking completing rough position in the static or displacement process of magnetic float judges, otherwise returns step 1);
5) after judging that the rough position of magnetic float is between the 0.5L of certain sensor (i) front and back at every turn, if judge, 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 nonlinear relationship between the relative position of magnetic float and sensor and sensor output voltage value to carry out interpolation calculation, obtain the exact position of the relatively previous sensor (i-1) of magnetic float 1; If judge, magnetic float is after this sensing station, then select a rear sensor output voltage value (V(i+1)), the nonlinear relationship between the relative position of magnetic float and sensor and sensor output voltage value is utilized to carry out interpolation calculation, obtain the exact position of the relatively rear sensor of magnetic float, thus 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 caused because tongue tube is fragile.The present invention utilizes the metering system of the many groups linear hall sensor be distributed on multiple pcb board, adopt bus marco and transmission hall output voltage simultaneously, in addition, in principle of work, the present invention chooses Hall element output voltage segment of curve 41 and segment of curve 43(Fig. 6), expand the measurement range of single linear hall element, thus realize using linear hall sensor to measure the displacement of Long travel.Such as require resolution ± 1cm, measure 1 meter of shift length, use tongue tube or switching Hall components, need 100 sensor components, if and the present invention is set to 8cm linear hall sensor device spacing, then only need use 13 linear hall sensors, therefore, the present invention can reduce components and parts welding quantity when meeting Long travel and measuring magnetic float displacement, improve magnetic float level indicator production efficiency and reduce liquid level gauge material and manufacturing cost.In addition, invention propose use single constant current source Hall element is powered and to metering circuit grouping time sharing power supply mode, reduce the power of device, device general power supply current can be less than 4mA.
Accompanying drawing explanation
Fig. 1 is linear hall sensor structure of the present invention (left figure) and measures magnetic direction (right figure) schematic diagram;
Fig. 2 be the first linear hall sensor arrangement architecture of the present invention and and magnetic float position relationship schematic diagram;
Fig. 3 be the second linear hall sensor arrangement architecture of the present invention and and magnetic float position relationship schematic diagram;
Fig. 4 is the metering circuit schematic diagram adopting the first power supply mode;
Fig. 5 is the metering circuit schematic diagram adopting the second power supply mode;
Fig. 6 is embodiment of the present invention magnetic float and sensor relative position sensor output voltage values schematic diagram;
Fig. 7 is that the embodiment of the present invention judges rough position and calculates exact position method schematic diagram.
Embodiment
Below by embodiment and accompanying drawing, the present invention will be described, 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 travel magnetic float.Comprise one block of magnet in magnetic float, thus in each accompanying drawing of the present invention, express the magnetic direction of magnetic float by the magnetic direction of magnet.The present invention mainly comprises Sensor section and measurement section in two sub-sections, first introduces Sensor section below.
The sensor that the present invention adopts is linear hall sensor array, and Fig. 1 gives the pin definitions of adopted single linear hall sensor and measures magnetic direction schematic diagram.Left-half is pin definitions schematic diagram, INPUT+ and INPUT-is the positive and negative input pin of linear hall sensor power supply respectively, linear hall sensor power supply can be constant current source also can be constant pressure source, the constant current-supplying that the present invention uses, OUTPUT+ and OUTPUT-is linear hall sensor voltage output pin, its output difference component voltage.Right half part measures magnetic direction schematic diagram, if direction is identical therewith for magnetic direction, then linear hall sensor exports positive voltage; If magnetic direction therewith direction is contrary, then linear hall sensor exports negative voltage; Linear hall sensor output voltage size is directly proportional to magnetic field intensity.
Linear hall sensor of the present invention linearly arranges on strip pcb board, Fig. 2 and Fig. 3 provides the position relationship between a kind of Distribution of Magnetic Field of magnetic float and linear hall sensor respectively, and the magnet in magnetic float 1 is arbitrary shape or the combination that can realize this Distribution of Magnetic Field.In Fig. 2, linear hall sensor 21 is arranged on pcb board 2, arrangement pitches L, spacing L is not less than the size of magnet in linear hall sensor orientation in magnetic float 1, the N pole of magnetic float 1 is identical with linear hall sensor 21 orientation with S extreme direction, magnetic float 1 and pcb board 2 keep constant distance, movable or static along linear hall sensor 21 orientation.It is vertical with linear hall sensor 21 orientation that linear hall sensor 21 measures magnetic direction.There is expansion interface 22 at pcb board 2 two ends, measure length easily extensible.In Fig. 3, linear hall sensor 21 is arranged on pcb board 2, arrangement pitches L, spacing L is not less than the size of magnet in linear hall sensor orientation in magnetic float 1, the N pole of magnetic float 1 is vertical with linear hall sensor 21 orientation with S extreme direction, magnetic float 1 and pcb board 2 keep constant distance, movable or static along linear hall sensor 21 orientation.It is identical with linear hall sensor 21 orientation that linear hall sensor 21 measures magnetic direction.There is expansion interface 22 at pcb board 2 two ends, measure length easily extensible.
If the number of one group of linear hall sensor 21 is n, then n linear hall sensor 21 is evenly arranged on pcb board, and spacing L is not less than the size of magnet in linear hall sensor orientation in magnetic float 1.In such as magnetic float 1, the size of magnet in linear hall sensor orientation is 4cm, and linear hall sensor 21 arrangement pitches L can be 8cm, has electric interfaces, easily extensible length at PCB two ends.The differential voltage exported is by multiplexing two difference transmission lines of n channel analog multiplexer 25.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, forms primarily 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 to Sensor section and shares constant current source.Give AD converter 35 after the process such as signal processing circuit 34 differential voltage signal bus voltage filter and amplification, 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 sets forth the embodiment of two kinds of metering circuits.The power supply mode that Fig. 5 provides, is just the mode of a power supply in same group of linear hall sensor owing to have employed each, can increases supply current, can as preferred forms of the present invention.
In Fig. 4, same group of linear hall sensor 21 array is emitted on a pcb board 2, and power pin is cascaded, and by same constant current source power supply, and is controlled by switch 23.This group linear hall sensor 21 output voltage is by multiplexing differential voltage bus after analog multiplexer 25, it is by control bus C1, C2 that analog multiplexer 25 selects which linear hall sensor 21 to output to differential voltage bus ... Ck controls, such as: one group has 8 linear hall sensors, analog multiplexer can select 1 analog multiplexer with two 8, a select linear Hall element is just exporting, a select linear Hall element exports negative, and control bus needs three: C1, C2 and C3.Analog multiplexer 25 power supply is controlled by switch 24.Pcb board 2 can cascade, after cascade, and shared bus.The switch 23 and 24 that linear hall sensor is corresponding, by CS1, CS2 ... CSm controls.
The metering system of Fig. 5 with the difference of Fig. 4 is: often organize linear hall sensor 21 and change into the single linear hall sensor 21 using Multipexer selector switch 26 to be chosen as in every group by powering together with connecting and power separately.Multipexer selector switch 26 and analog multiplexer 25 common source and control signal: C1, C2 ... Ck.
Fig. 6 is " magnetic float and sensor relative position sensor output voltage " relation schematic diagram.Use curve of the present invention 41 sections and 43 sections of calculating magnetic float exact positions.Be sensing station through sensor 21 and horizontal ordinate vertical dotted line and horizontal ordinate intersection point.Be magnetic float position through magnetic float 1 center and horizontal ordinate vertical dotted line and horizontal ordinate intersection point, the magnitude of voltage that this dotted line is corresponding with curve intersection point is V, namely magnetic float is at current location sensor output voltage V, and the position of magnetic float relative sensors is S1.
Measuring method:
Measure any linear hall sensor output voltage: the constant current source of the enable Hall element place group that will measure and analog multiplexer power supply, use the linear hall sensor that analog multiplexer channel selecting control bus gating will be measured, this linear hall sensor output voltage outputs on Hall voltage signal transmission bus by analog multiplexer, this voltage signal is by after signal processing circuit, through AD conversion, obtained by MCU.
Magnetic float 1 keeps and pcb board 2 constant distance at linear hall sensor 21, and certain position is moved or is still in the direction along sensor 21 array of parallel pcb board 2.If sensor 21 arrangement pitches L;
As shown in Figure 6, magnetic float 1 certain sensor from afar in proximity transducer 21 array is 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 pcb board.
Sensor output voltage illustrates: magnetic float is when certain sensing station, and magnetic float is equal apart from the distance of sensor before and after this sensor, therefore contrary the but voltage that absolute value is identical of former and later two sensor output symbols of this sensor; As shown in Figure 7, magnetic float 1 before this sensing station and distance is less than 0.5L time, magnetic float 1 and the previous sensor distance of this sensor are less than the distance with a sensor thereafter, then front sensor output voltage absolute value | V (i-1) | be greater than rear sensor output value | and V (i+1) | and symbol is contrary; Magnetic float after this sensing station and distance is less than 0.5L time, after magnetic float and this sensor, sensor distance is less than the distance of sensor previous with it, and this rear sensor output voltage absolute value is greater than front sensor output valve and symbol is contrary.Magnetic float is before and after this sensing station in 0.5L, and distance is nearest apart from this sensor, the magnitude of voltage absolute value that this sensor exports | V (i) | and maximum.
Measuring process:
1) according to the distributing order of sensor array, if second of sensor array sensor is current sensor;
2) the previous sensor adjacent with current sensor and a rear sensor and the magnitude of voltage of itself is obtained, if three sensor voltage absolute values are all greater than setting threshold value, and the maximum and absolute value of voltage that is previous sensor of the absolute value of voltage of current sensor is greater than the absolute value of voltage of a rear sensor, then judge magnetic float certain position before current sensor position within 0.5L, terminate the location of magnetic float rough position; If three sensor voltage absolute values are all greater than threshold value, and the maximum and absolute value of voltage that is previous sensor of the absolute value of voltage of current sensor is less than the absolute value of voltage of a rear sensor, then judge magnetic float certain position after current sensor position within 0.5L, terminate the judgement of magnetic float rough position;
3) according to step 2) method, whether the position judging magnetic float before and after current sensor position between 0.5L, if; would perform step 4); Otherwise the next sensor of current sensor is considered as current sensor, again judges; If scanned all the sensors still cannot judge magnetic float rough position, return step 1);
4), behind magnetic float rough position location, again voltage scanning collection is carried out, according to step 2) method, first judge that magnetic float is whether between the front and back 0.5L distance of current sensor position, if, this sensor is still current sensor; If do not exist, judge magnetic float whether between the front and back 0.5L distance of the previous sensing station of current sensor, if, previous for current sensor sensor is set to current sensor; Otherwise judge magnetic float whether after current sensor a sensing station front and back 0.5L distance between, if, a sensor after current sensor is set to current sensor; Repeat this step, the tracking completing rough position in the static or displacement process of magnetic float judges, otherwise returns step 1);
5) after judging that the rough position of magnetic float is between the 0.5L of certain sensor 21 (i) front and back at every turn, if judge, magnetic float is before this sensor 21 (i) position, as shown in Figure 7, use this sensor previous sensor 21 (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 (i-1) of magnetic float 1.If judge, 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.Thus calculate concrete exact position, float place.
Compared with patented claim 201210016996.6, use curve section 41 and 43 of the present invention, linear hall sensor arrangement pitches needs to be greater than magnet length, now uses linearity curve section 42 cannot realize above-mentioned patent measuring method.The reason of use curve section 41 and 43 and advantage:
1, in magnetic float, magnet accounts for float weight large percentage, in low density liquid (such as: 0.4g/cm3) level gauging, in magnetic float, the size of magnet is smaller in linear hall sensor orientation, if magnet size is large, magnet preponderance, magnetic float does not get up floating, liquid level cannot be measured, magnet size is larger at linear hall sensor orientation less linearity curve section 42 slope, the displaced segments of linearity curve section 42 correspondence is less, the displacement that single linear hall sensor can be measured is less, now use linearity curve section 42 to measure Long travel displacement and just need a large amount of linear hall sensor, the realization that the present invention measures will be very difficult.And use curve section 41 and 43, breach the restriction of magnet size, extend the measurement range of single linear hall sensor, be conducive to the realization of measurement mechanism.
2, the present invention extends the measurement range of single linear hall sensor, the present invention's single linear hall sensor measurement range can be more than 2 times of the single linear hall sensor measurement range of above-mentioned patent, decrease the usage quantity of linear hall sensor, be easy to realize large range measuring, reduce costs, such as use the magnet of 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 has the advantage using the little measurement range of number of sensors large compared with Hall switch sensor, and also has the advantage using the little measurement range of number of sensors large compared with the same method using linear hall sensor to measure displacement.
Claims (3)
1. the Long travel displacement measuring device 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 as at least one group of linear hall sensor, often organizing the even word of Hall element is arranged on a pcb board, adjacent linear hall sensor spacing is not less than the size of magnet in sensor array orientation on 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 channel analog multiplexer, two differential voltage signal transmission lines are connected with the input interface of signal processing circuit, two adjacent pcb boards are connected by expansion interface, each group of linear hall sensor is by same constant current source time sharing power supply, and the same time only has one group of n channel analog multiplexer output voltage signal on differential voltage signal transmission line, and other analog multiplexer exports and is in high-impedance state, differential voltage signal is transferred to after signal processing circuit carries out filter amplifying processing through two difference transmission lines, is sent to single-chip microcomputer after converting digital quantity to by analog to digital converter.
2. the Long travel displacement measuring device based on Hall effect according to claim 1, is characterized in that, each linear hall sensor using Multipexer selector switch to be chosen as in the linear hall sensor group of same group is powered separately.
3. the measuring method adopting Long travel displacement measuring device according to claim 1 to realize, if form 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 the method comprises:
1) according to the distributing order of sensor array, if second of sensor array sensor is current sensor;
2) the previous sensor adjacent with current sensor and a rear sensor and the magnitude of voltage of itself is obtained, if three sensor voltage absolute values are all greater than setting threshold value, and the maximum and absolute value of voltage that is previous sensor of the absolute value of voltage of current sensor is greater than the absolute value of voltage of a rear sensor, then judge magnetic float certain position before current sensor position within 0.5L, terminate the judgement of magnetic float rough position; If three sensor voltage absolute values are all greater than threshold value, and the maximum and absolute value of voltage that is previous sensor of the absolute value of voltage of current sensor is less than the absolute value of voltage of a rear sensor, then judge magnetic float certain position after current sensor position within 0.5L, terminate the judgement of magnetic float rough position;
3) according to step 2) method, whether the position judging magnetic float before and after current sensor position between 0.5L, if; would perform step 4); Otherwise the next sensor of current sensor is considered as current sensor, again judges; If scanned all the sensors still cannot judge magnetic float rough position, return step 1);
4), after magnetic float rough position judges, again voltage scanning collection is carried out, according to step 2) method, first judge that magnetic float is whether between the front and back 0.5L distance of current sensor position, if, this sensor is still current sensor; If do not exist, judge magnetic float whether between the front and back 0.5L distance of the previous sensing station of current sensor, if, previous for current sensor sensor is set to current sensor; Otherwise judge magnetic float whether after current sensor a sensing station front and back 0.5L distance between, if, a sensor after current sensor is set to current sensor; Repeat this step, the tracking completing rough position in the static or displacement process of magnetic float judges, otherwise returns step 1);
5) after judging that the rough position of magnetic float is between the 0.5L of certain sensor (i) front and back at every turn, if judge, 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 nonlinear relationship between the relative position of magnetic float and sensor and sensor output voltage value to carry out interpolation calculation, obtain the exact position of the relatively previous sensor (i-1) of magnetic float 1; If judge, magnetic float is after this sensing station, then select a rear sensor output voltage value (V (i+1)), the nonlinear relationship between the relative position of magnetic float and sensor and sensor output voltage value is utilized to carry out interpolation calculation, obtain the exact position of the relatively rear sensor of magnetic float, thus calculate the exact position at magnetic float place.
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| CN102878916A (en) | 2013-01-16 |
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