CN115727929A - Magnetostrictive sensor calibration method and device - Google Patents
Magnetostrictive sensor calibration method and device Download PDFInfo
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- CN115727929A CN115727929A CN202310031770.1A CN202310031770A CN115727929A CN 115727929 A CN115727929 A CN 115727929A CN 202310031770 A CN202310031770 A CN 202310031770A CN 115727929 A CN115727929 A CN 115727929A
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Abstract
The invention relates to the technical field of sensor calibration, in particular to a method and a device for calibrating a magnetostrictive sensor. Because the liquid level detection requirement in the spinning process is high, the magnetostrictive sensor needs to be calibrated before being used to eliminate the self error as much as possible. In the calibration process, the theoretical liquid level height change is calculated through water pumping, weighing and conversion, then the theoretical liquid level height change is compared with a value actually measured by the magnetostrictive sensor, so that an error value of the magnetostrictive sensor is obtained, the measurement range of the magnetostrictive sensor is divided into a plurality of measurement sections, each measurement section is provided with a corresponding error value, and the error values are concentrated to generate an error library, so that in the actual use of the magnetostrictive sensor, the corresponding error value compensation can be performed on the measurement result of the magnetostrictive sensor according to the measurement section where the movable magnetic ring is located, and the accuracy of the magnetostrictive sensor in measuring the liquid level position is ensured.
Description
Technical Field
The invention relates to the technical field of sensor calibration, in particular to a method and a device for calibrating a magnetostrictive sensor.
Background
In the spinning process, the liquid level position of the feed liquid is often required to be measured by a sensor. The magnetostrictive sensor is a sensor which accurately detects the absolute position of a movable magnetic ring on a detection rod through a non-contact measurement and control technology so as to measure the actual displacement value of a detected product, and the movable magnetic ring is not in direct contact with the detection rod, so that the influence of friction on a detection result can be avoided, and the magnetostrictive sensor is suitable for liquid level detection.
The structure of the magnetostrictive sensor when detecting the liquid level is shown in figure 1, the movable magnetic ring of the magnetostrictive sensor is arranged in a floating ball, a main body with a detection rod is fixed, the floating ball moves along with the change of the liquid level, and the floating ball drives the movable magnetic ring to move so as to realize the detection of the liquid level. Since the requirement for the precision of the liquid level position in the spinning process is very high, and there is usually only a few filaments, the detection accuracy may be affected by the error of the magnetostrictive sensor.
Accordingly, there is a need for a method and apparatus that can calibrate magnetostrictive sensors.
Disclosure of Invention
The invention provides a magnetostrictive sensor calibration method which can effectively solve the problems in the background technology. The invention also provides a calibration device of the magnetostrictive sensor, which can achieve the same technical effect.
The invention provides a magnetostrictive sensor calibration method, which comprises the following steps:
s10: adding water into the first container, fixedly installing a magnetostrictive sensor above the first container, and enabling the floating ball and the detection rod to extend into the water; recording the cross section area of the first container as S, and recording the distance data detected by the magnetostrictive sensor at the moment as h0;
s20: withdrawing water having a mass m from the first vessel;
s30: recording the distance data detected by the magnetostrictive sensor as h, and calculating the descending distance Hg measured by the floating ball; calculating the theoretical liquid level descending distance Ht according to the water pumping amount; then obtaining an error value delta H = Hg-Ht;
s40: repeating S20-S30 for a plurality of times, and setting n as the number of pumping times to obtain a plurality of error values delta Hn; setting a qualified error interval, and judging that the magnetostrictive sensor is qualified when all delta Hn are within the qualified error interval;
s50: and establishing an error library for recording error values of all the measurement sections of the magnetostrictive sensors, wherein the error value delta Hn corresponds to the measurement section with the measurement distance of (n-1) Ht-n Ht.
Further, in step S20, a quantitative volume of water is drawn from the first container using a peristaltic pump.
Further, in step S20, the second container is placed on a weighing device for weighing, and the water pumped from the first container is directly drained into the second container.
Further, in steps S20 to S30, the distance value detected by the magnetostrictive sensor is calculated by detecting the current value I of the magnetostrictive sensor, and the specific calculation method is as follows:
when the current lower limit value and the current upper limit value in the effective detection range of the magnetostrictive sensor are Imin and Lmax, respectively, and the detection distance lower limit value and the distance upper limit value in the effective detection range are Lmin and Lmax, respectively, the detection data h = I · (Lmax-Lmin)/(Imax-Imin) of the magnetostrictive sensor.
Further, in step S40, for the nth water pumping, there are:
the measurement data of the magnetostrictive sensor is hn;
the theoretical liquid level descending distance Ht = m · ρ/S, ρ being the density of water;
the floating ball measures the descending distance Hgn = hn-h (n-1);
error value Δ Hn = Hgn-Ht.
Further, in step S40, for the nth water pumping, there are:
the measurement data of the magnetostrictive sensor is hn;
the theoretical liquid level descending distance Htn = n · m · ρ/S, ρ being the density of water;
the floating ball measures the descending distance Hgn = hn-h0;
error value Δ Hn = Hgn-Htn.
The invention also provides a calibration device for a magnetostrictive sensor, which is used for realizing the calibration method for the magnetostrictive sensor, and comprises the following steps:
a first container having an upwardly open cavity therein; the magnetostrictive sensor is fixed on the top of the first container;
a weighing device for weighing the second container;
a water pumping device for pumping water from the first container and discharging the water into the second container;
and the current detection device is used for detecting the current of the magnetostrictive sensor.
Furthermore, a water outlet hole is formed in the bottom of the first container, and the water pumping device pumps water outwards from the water outlet hole.
Further, the water pumping device is a peristaltic pump.
Further, a supporting plate is arranged at the bottom of the second container.
Through the technical scheme of the invention, the following technical effects can be realized:
the method comprises the steps of pumping water to change the liquid level, weighing the amount of pumped water to calculate a value of the theoretical liquid level change, and comparing the value with a value actually measured by a magnetostrictive sensor to obtain an error value of the magnetostrictive sensor so as to judge whether the error of the magnetostrictive sensor is qualified; when the error value is obtained, the method divides the measuring range of the magnetostrictive sensor into a plurality of measuring sections in a mode of pumping water for a plurality of times and calculating the error amount, each measuring section is provided with a corresponding error value, and the error values are concentrated to generate an error library, so that in the actual use of the magnetostrictive sensor, the corresponding error value compensation can be carried out on the measuring result of the magnetostrictive sensor according to the measuring section where the movable magnetic ring is located, and the accuracy of the magnetostrictive sensor in measuring the liquid level position is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a magnetostrictive sensor;
FIG. 2 is a schematic diagram illustrating a first method for calculating Δ Hn according to the present invention;
FIG. 3 is a schematic diagram illustrating a second method for calculating Δ Hn according to the present invention;
FIG. 4 is a schematic diagram of a magnetostrictive sensor calibration device according to the invention;
reference numerals are as follows: 01. a magnetostrictive sensor; 02. a floating ball; 03. a detection lever; 1. a first container; 11. a water outlet hole; 2. a weighing device; 3. a second container; 31. a support disc; 4. a water pumping device; 5. and a current detection device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to a magnetostrictive sensor calibration method, which comprises the following steps:
s10: adding water into the first container 1, fixedly installing the magnetostrictive sensor 01 above the first container 1, and enabling the floating ball 02 and the detection rod 03 to extend into the water, so that the floating ball 02 is positioned at the topmost end of the detectable range of the detection rod 03; recording the cross-sectional area of the first container 1 as S, and recording the distance data detected by the magnetostrictive sensor 01 as h0;
s20: after water with the mass of m is pumped out of the first container 1, the water level in the first container 1 is reduced, and the floating ball 02 is reduced along with the water level;
s30: recording the distance data detected by the magnetostrictive sensor 01 as h, and calculating the descending distance Hg measured by the floating ball 02; according to a density volume mass formula, the theoretical liquid level descending distance Ht = m · ρ/S can be calculated in a reverse-deduction mode, and ρ is the density of water; then, an error value Δ H = Hg-Ht is obtained;
s40: repeating S20-S30 for a plurality of times to obtain a plurality of error values, and if n is the pumping frequency, generating n error values which are respectively marked as delta H1, delta H2 … … delta Hn; setting a qualified error interval, and judging that the magnetostrictive sensor 01 is qualified when all delta Hn are within the qualified error interval;
s50: establishing an error library for recording error values of each measurement section of the magnetostrictive sensor 01, wherein the specific corresponding relationship of the error library is as follows:
the error value delta H1 corresponds to a measuring section with the measuring distance of 0 to Ht;
the error value delta H2 corresponds to a measuring section with a measuring distance Ht-2. Ht;
……
the error value delta Hn corresponds to a measuring section with a measuring distance of (n-1). Ht-n.Ht;
in the actual detection process of the magnetostrictive sensor 01, the data measured by the magnetostrictive sensor 01 can be compensated according to the error library, for example, when the value of the data H measured by the magnetostrictive sensor 01 is in the Ht-2. Ht measurement section, the value of H plus Δ H2 is taken as the height data of the final liquid level, so that the detection accuracy of the magnetostrictive sensor 01 is ensured.
Preferably, in step S20, a measured volume V of water is withdrawn from the first container 1 using a peristaltic pump. The peristaltic pump can accurately control the flow, so that the pumping volume of each time is the same, and the accuracy of subsequent calculation is ensured.
Preferably, in step S20, the second container 3 is placed on the weighing device 2 for weighing, and the water extracted from the first container 1 is directly discharged into the second container 3, and the weighing device 2 usually has a number-indicating zero-clearing function, so that the mass of the water can be directly read, and the operation is convenient for a person.
The magnetostrictive sensor 01 outputs a current signal outwards, and when the movable magnetic ring is farther from the reference surface (i.e., the h value is larger), the current signal is larger, generally, the magnetostrictive sensor 01 is further equipped with a corresponding calculation module to convert the current signal value into a distance value, and if the value of the calculation module is used, an error may be generated in the signal received by the calculation module due to interference, so that in steps S20 to S30, the calculation module originally matched with the magnetostrictive sensor 01 is removed, the current value I of the magnetostrictive sensor 01 is directly detected, and then the distance value detected by the magnetostrictive sensor 01 is calculated by using the current value I, so that the information transmission span is reduced, and the data error occurring in the transmission process is avoided, and the specific calculation method is as follows:
in the actual use process of the magnetostrictive sensor 01, the most accurate middle section of the detection rod 03 is usually selected as an effective detection range, two ends with larger errors of the detection rod 03 are avoided, the lower limit value of the current in the effective detection range of the magnetostrictive sensor 01 is Imin, the upper limit value of the current is Imax, the lower limit value of the detection distance in the corresponding effective detection range is Lmin, and the upper limit value of the distance is Lmax, so that the detection data h = I (Lmax-Lmin)/(Imax-Imin) of the magnetostrictive sensor 01. For example, the current value in the effective detection range is 4 to 20ma, and the corresponding height range is 0 to 100mm, the height corresponding to each milliampere is (100-0) mm/(20-4) mA =6.25mm/mA, and the detection height h = i × 6.25.
For the calculation of Δ Hn in step S40, the method provides two different embodiments:
firstly, as shown in fig. 2, the absolute error between the height variation data detected on each measuring segment and the theoretical height variation data can be accurately reflected by using the starting point of each measuring segment as a reference;
for the 1 st water pumping, the measurement data of the magnetostrictive sensor 01 is h1; the theoretical descending distance of the liquid level is constant Ht = m.rho/S; the floating ball 02 measures the descending distance Hg1= h1-h0; error value Δ H1= Hg1-Ht;
for the 2 nd water pumping, the measurement data of the magnetostrictive sensor 01 is h2; the liquid level theory is constant in descending distance Ht = m · ρ/S; the floating ball 02 measures the descending distance Hg1= h2-h1; error value Δ H2= Hg2-Ht;
……
for the nth water pumping, the measurement data of the magnetostrictive sensor 01 is hn; the liquid level theory is constant in descending distance Ht = m · ρ/S; the floating ball 02 measures the descending distance Hgn = hn-h (n-1); error value Δ Hn = Hgn-Ht.
In the second mode, as shown in fig. 3, all the measurement sections are based on the same plane, and can reflect the error between the height change data detected in each measurement section and the theoretical height change data, which is generated relative to the reference zero plane;
for the 1 st water pumping, the measurement data of the magnetostrictive sensor 01 is h1; the theoretical descending distance Ht1=1 m · ρ/S of the liquid level relative to the reference zero plane; the floating ball 02 measures the descending distance Hg1= h1-h0; error value Δ H1= Hg1-Ht1;
for the 2 nd water pumping, the measurement data of the magnetostrictive sensor 01 is h2; the theoretical descending distance Ht2 of the liquid level relative to the reference zero surface is =2 m · ρ/S; the floating ball 02 measures the descending distance Hg2= h2-h0; error value Δ H2= Hg2-Ht2;
……
for the nth water pumping, the measurement data of the magnetostrictive sensor 01 is hn; the theoretical descending distance Htn = n m · ρ/S of the liquid level relative to the reference zero plane; the floating ball 02 measures the descending distance Hgn = hn-h0; error value Δ Hn = Hgn-Htn.
Because the floating ball 02 of the magnetostrictive sensor 01 may span multiple measurement sections in actual use, the method optimally adopts a second method to calculate the error value, and the formed actual measurement data table is as follows:
TABLE 1 actual measurement data Table
The invention also relates to a magnetostrictive sensor calibration device, which is used for implementing the magnetostrictive sensor calibration method, and as shown in fig. 4, the device comprises:
the first container 1 is internally provided with a cavity which is opened upwards and is used for containing water;
the mounting frame 2 is used for fixing the magnetostrictive sensor 01 on the top of the first container 1; the magnetostrictive sensor is fixed on the top of the first container 1;
a weighing device 2 for weighing the second container 3;
a water pumping device 4 for pumping water out of the first container 1 and discharging into the second container 3;
and a current detection device 5 for detecting a current of the magnetostrictive sensor 01.
In order to avoid the interference of the water flow on the magnetostrictive sensor 01 when water is pumped, the water outlet hole 11 is preferably arranged at the bottom of the first container 1, and the water pumping device 4 pumps water outwards from the water outlet hole 11, so that the liquid level in the first container 1 is ensured to be stable.
The pumping device 4 is preferably provided as a peristaltic pump, which not only can accurately control the flow rate, but also can pump water more smoothly, thereby further ensuring the stability of the liquid level in the first container 1.
The supporting plate 31 is preferably arranged at the bottom of the second container 3, so that the contact area between the bottom of the second container 3 and the weighing device 2 is increased, the stability of the second container 3 can be improved to avoid the second container 3 from toppling over, and the weighing device 2 can be ensured to more accurately measure the increment of the water in the second container 3 and the internal water.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A method of calibrating a magnetostrictive sensor, comprising the steps of:
s10: adding water into the first container (1), fixedly installing a magnetostrictive sensor at the top of the first container (1), and enabling the floating ball and the detection rod to extend into the water; recording the cross-sectional area of the first container (1) as S, and recording the distance data detected by the magnetostrictive sensor as h0;
s20: drawing water of mass m from the first container (1);
s30: recording the distance data detected by the magnetostrictive sensor as h, and calculating the floating ball measuring descending distance Hg; calculating the theoretical liquid level descending distance Ht according to the water pumping amount; then, an error value Δ H = Hg-Ht is obtained;
s40: repeating S20-S30 for a plurality of times, and setting n as the number of pumping times to obtain a plurality of error values delta Hn; setting a qualified error interval, and judging that the magnetostrictive sensor is qualified when all delta Hn are within the qualified error interval;
s50: and establishing an error library for recording error values of each measurement section of the magnetostrictive sensor, wherein the error value delta Hn corresponds to the measurement section with the measurement distance of (n-1) · Ht-n · Ht.
2. The magnetostrictive sensor calibration method according to claim 1, characterized in that in step S20 a quantitative volume of water is drawn from the first container (1) using a peristaltic pump.
3. The magnetostrictive sensor calibration method according to claim 2, characterized in that in step S20 the second container (3) is placed on a weighing device (2) for weighing, and water drawn from the first container (1) is drained directly into the second container (3).
4. The method for calibrating a magnetostrictive sensor according to claim 1, characterized in that in steps S20 to S30, the distance value detected by the magnetostrictive sensor is calculated by detecting the current value I of the magnetostrictive sensor, and the specific calculation method is as follows:
when the current lower limit value and the current upper limit value in the effective detection range of the magnetostrictive sensor are Imin and Lmax, respectively, and the detection distance lower limit value and the distance upper limit value in the effective detection range are Lmin and Lmax, respectively, the detection data h = I · (Lmax-Lmin)/(Imax-Imin) of the magnetostrictive sensor.
5. The method of calibrating a magnetostrictive sensor according to claim 1, characterized in that in step S40, for the nth water pumping, there are:
the measurement data of the magnetostrictive sensor is hn;
the theoretical liquid level descending distance Ht = m · ρ/S, ρ being the density of water;
the floating ball measures the descending distance Hgn = hn-h (n-1);
error value Δ Hn = Hgn-Ht.
6. The method of calibrating a magnetostrictive sensor according to claim 1, characterized in that in step S40, for the nth water pumping, there are:
the measurement data of the magnetostrictive sensor is hn;
the theoretical liquid level descending distance Htn = n · m · ρ/S, ρ being the density of water;
the floating ball measures the descending distance Hgn = hn-h0;
error value Δ Hn = Hgn-Htn.
7. A magnetostrictive sensor calibration device for implementing the magnetostrictive sensor calibration method according to any one of claims 1~6, comprising:
a first container (1) having a cavity with an upward opening therein; the magnetostrictive sensor is fixed on the top of the first container (1);
-weighing means (2) for weighing the second container (3);
a water pumping device (4) for pumping water out of the first container (1) and discharging the water into the second container (3);
and the current detection device (5) is used for detecting the current of the magnetostrictive sensor.
8. The magnetostrictive sensor calibration device according to claim 7, characterized in that the first container (1) is provided with a water outlet hole (11) at the bottom, and the water pumping device (4) pumps water outwards from the water outlet hole (11).
9. The magnetostrictive sensor calibration device according to claim 7, characterized in that the water pumping device (4) is a peristaltic pump.
10. The magnetostrictive sensor calibration device according to claim 7, characterized in that a support disc (31) is arranged at the bottom of the second container (3).
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