CN113432625A - Calibration system and calibration method of hydrostatic level - Google Patents
Calibration system and calibration method of hydrostatic level Download PDFInfo
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- CN113432625A CN113432625A CN202110777203.1A CN202110777203A CN113432625A CN 113432625 A CN113432625 A CN 113432625A CN 202110777203 A CN202110777203 A CN 202110777203A CN 113432625 A CN113432625 A CN 113432625A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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Abstract
The invention provides a calibration system and a calibration method of a hydrostatic level, which comprise the following steps: the static level gauge is arranged on the lifting platform and provided with a static level sensor. The calibration pot body is arranged on the displacement platform and provided with a reference scale mark, the initial heights of the calibration pot body and the static level are the same, and the lifting platform is positioned on one side of the displacement platform. And the inner pipe is connected with the static level gauge and the calibration pot body. And the displacement meter is arranged on the calibration pot body and used for measuring the actual position of the liquid level in the calibration pot body. The calibration system and the calibration method of the hydrostatic level provided by the invention can improve the measurement precision of the measuring device.
Description
Technical Field
The invention relates to the technical field of engineering measurement, in particular to a calibration system and a calibration method of a hydrostatic level.
Background
Static leveling systems are precision instruments that measure and monitor the amount of relative height change between different positions based on the principle of a communicating vessel. Since the liquid level of the liquid in the container is kept consistent, when the depth of the liquid in the container is changed, the displacement of the position of the container in the vertical direction can be obtained by detecting the change amount of the depth.
The static leveling has the characteristics of simple structure, high precision, good stability, no need of through vision and the like, and is easy to realize automatic settlement measurement. Generally, the method of fixing and installing the device on a monitoring point is adopted, and the device has wide application in differential settlement observation of building structures such as rail transit, dams, large building bottom plates and the like. However, a non-negligible primary error, such as an abbe error, is easily generated during the use process. Therefore, there is still a need to further improve the measurement accuracy of static leveling systems. In addition, the static level sensor is used as a measuring unit of the static level system, and the core function of the static level sensor is to measure the position of the liquid level in the static level system. Calibration of the system is also required in order to accurately measure changes in the liquid level.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a calibration system and a calibration method of a hydrostatic level, which are used for strictly calibrating the relationship between the measurement value and the displacement of a sensor of the hydrostatic level, realizing the accurate measurement of the liquid level change and improving the measurement accuracy of the hydrostatic level system.
To achieve the above object, the present invention provides a calibration system for a hydrostatic level, comprising:
the static force level gauge is arranged on the lifting platform and provided with a static force level sensor;
the calibration pot body is arranged on the displacement platform and provided with a reference scale mark, the initial heights of the calibration pot body and the static level are the same, and the lifting platform is positioned on one side of the displacement platform;
the connecting inner pipe is used for connecting the static water level and the calibration pot body;
and the displacement meter is arranged on the calibration pot body and used for measuring the actual position of the liquid level in the calibration pot body.
The invention also provides a calibration method of the hydrostatic level, which comprises the following steps:
adjusting the lifting platform to enable the initial heights of the calibration pot body and the static level to be the same;
acquiring an initial numerical value of the static level sensor;
obtaining the measurement value of the static force level sensor when the calibration bowl body is at different liquid level heights;
acquiring an actual displacement value of the liquid level in the calibration pot body;
fitting the actual displacement value measured by the displacement gauge to the hydrostatic level sensor measurement value.
In conclusion, the invention has the following beneficial effects: abbe errors are eliminated by arranging the axes of the calibration pot body and the displacement platform on the same straight line. And measuring the actual liquid level change by using a displacement meter, and recording the actual displacement change value and the measured value of the static level sensor to fit a functional relation curve. The method realizes strict calibration of the relation between the measurement value and the displacement of the static level sensor, accurately measures the change value of the liquid level, improves the measurement precision of the static level gauge, correspondingly reduces the measurement cost, and improves the measurement efficiency and accuracy.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a calibration system and a calibration method for a hydrostatic level according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hydrostatic level structure of a calibration system and a calibration method of a hydrostatic level according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a calibration system and a calibration method for a hydrostatic level according to the present invention for calibrating a reference graduation mark inside a bowl body in one embodiment;
FIG. 4 is a flow chart of a calibration system and a calibration method of a hydrostatic level according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a capacitance versus displacement curve of a calibration system and a calibration method for a hydrostatic level according to an embodiment of the present invention;
FIG. 6 is a partial enlarged view of capacitance variation in an embodiment of a calibration system and method for a hydrostatic level according to the present invention;
FIG. 7 is a schematic diagram of a fitting curve of a calibration system and a calibration method of a hydrostatic level according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a fitting curve residual error of a calibration system and a calibration method of a hydrostatic level according to an embodiment of the present invention.
Description of reference numerals:
1. a hydrostatic level; 11. putting the bowl body; 12. a static leveling sensor; 13. a bowl body is put down; 2. a lifting platform; 3. connecting the inner pipes; 4. a displacement meter; 5. calibrating the bowl body; 51. a reference scale mark; 6. a displacement platform.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1 to fig. 3, in order to realize the strict calibration of the relationship between the measurement value and the displacement of the static level sensor, the variation value of the liquid level is accurately measured, and the measurement accuracy of the static level gauge is improved. The invention provides a calibration system of a static level gauge, which comprises: the static force level gauge comprises a static force level gauge 1, a lifting platform 2, a connecting inner pipe 3, a displacement meter 4, a calibration pot body 5 and a displacement platform 6. The hydrostatic level 1 is arranged on the lifting platform 2, and a hydrostatic level sensor 12 is arranged in the hydrostatic level 1. The calibration bowl 5 is arranged on the displacement platform 6, the calibration bowl 5 is provided with reference graduation marks 51, and the initial heights of the calibration bowl 5 and the hydrostatic level 1 are the same. When the liquid level of the calibration pot 5 is positioned at the level of the reference scale mark 51, the static leveling sensor 12 obtains an initial value, and when the displacement platform 6 moves different distances, the static leveling sensor 12 obtains corresponding measured values. The connecting inner tube 3 connects the hydrostatic level 1 and the calibration bowl 5. The displacement meter 4 is arranged on the calibration pot body 5, measures the actual position of the liquid level in the calibration pot body 5, and performs curve fitting on the actual position of the liquid level and the measured value obtained by the static force level sensor 12.
Referring to fig. 1 and 2, the hydrostatic level 1 may be disposed on the lifting platform 2, and the hydrostatic level 1 may be driven to move in a vertical direction by adjusting the height of the lifting platform 2. The hydrostatic level 1 comprises an upper bowl 11, a hydrostatic level sensor 12 and a lower bowl 13. The static level sensor 12 may be inductive, photoelectric, ultrasonic, capacitive, etc., and in this embodiment, a capacitive static level sensor 12 is used. In other embodiments of the invention, sensors that detect using other principles may also be used, such as inductive sensors, photoelectric sensors, ultrasonic sensors, and the like. The static level sensor 12 records the saved full process sensor values Y1, Y2 … Yn.
Referring to fig. 1, an inner connecting tube 3 connects a hydrostatic level 1 and a calibration bowl 5. The inner connecting pipe 3 can be made of soft communicating water pipe made of silica gel. The connection inner tube 3 easily generates bubbles in the water adding process, and the measurement precision is influenced. Therefore, the outlet of the water pipe connected with the inner pipe 3 can be designed into an oblique angle, so that the amplitude angle is increased, and the accumulation of bubbles is reduced.
Referring to fig. 1, a calibration bowl 5 is disposed above a displacement platform 6, and the displacement platform 6 can drive the calibration bowl 5 to move in a vertical direction. The central axes of the calibration pot body 5 and the displacement device 6 are arranged on the same straight line to eliminate Abbe errors. The displacement platform 6 may be a high precision displacement device, and may be selected, for example, from a PPS-20SM precision positioning workpiece stage. The high-precision displacement device can be replaced by a displacement platform with different precision according to requirements, such as an attocude ECSx3050 nanometer-scale platform.
Referring to fig. 1 and 3, the internal base areas of the calibration bowl 5 and the hydrostatic level 1 may be the same, with the calibration bowl 5 and the hydrostatic level 1 at the same level in the initial state. According to the principle of a communicating vessel, when the displacement platform 6 drives the calibration pot body 5 to generate the displacement of H, the liquid level height in the static leveling pot body is changed by H/2. A high-precision reference scale mark 51 is processed inside the calibration bowl 5, and the reference scale mark 51 can be the highest position of the liquid level in the calibration bowl 5. One or more sensors can be arranged on the reference graduation marks to measure the liquid level position inside the calibration bowl 5. In order to facilitate adjustment of the water level height of the system, the variation range of the water level variation range with respect to the reference scale line 51 may be ± 6 mm.
Referring to fig. 1, the displacement meter 4 is disposed above the calibration bowl 5, when the calibration bowl 5 moves in the vertical direction under the action of the displacement device 6, the displacement meter 4 records the actual movement measurement distance of the calibration bowl 5 at different time intervals, and the displacement meter 4 obtains the actual measurement displacement distance Δ H. The displacement meter 4 may use a dispersive confocal displacement meter. The chromatic dispersion confocal displacement meter emits a beam of polychromatic light with a wide spectrum from a light source, and generates spectral dispersion through a chromatic dispersion lens to form monochromatic light with different wavelengths. The focal point for each wavelength corresponds to a distance value. The measuring light is emitted to the surface of an object and is reflected back, and only monochromatic light meeting the confocal condition can be sensed by the spectrometer through the small hole. The distance value is obtained by calculating the sensed focal wavelength and scaling. The chromatic dispersion confocal displacement meter can measure various materials such as metal, ceramic, transparent or semitransparent materials. The dispersion confocal displacement meter can be replaced by a precise measuring instrument which can measure the transparent liquid level variation and meet the precision requirement.
In order to strictly calibrate the relationship between the measurement value and the displacement of the static level sensor, the liquid level change is accurately measured, and the measurement precision of the static level gauge 1 is improved. The invention also proposes a method for calibrating a hydrostatic level, using the calibration system of a hydrostatic level according to claim 1, comprising the following steps:
s1, adjusting the lifting platform to enable the initial heights of the calibration pot body and the static level to be the same;
s2, acquiring an initial value of the static level sensor;
s3, obtaining the measurement values of the static force level sensor when the calibration pot body is at different liquid level heights;
s4, acquiring an actual displacement value of the liquid level in the calibration pot body;
and S5, fitting the actual displacement value measured by the displacement meter and the static leveling sensor measurement value.
Referring to fig. 1, 3 and 4, in step S1, the lifting platform 2 is adjusted to make the initial heights of the calibration bowl 5 and the hydrostatic level 1 the same. A high-precision reference scale mark 51 is processed inside the calibration pot 5. Deionized water is added into the calibration pot body 5 to reach the liquid level reference scale mark 51, and when the liquid level approaches the reference scale mark 51, auxiliary articles such as a dispersing agent, formalin and the like are added by using a needle tube, so that the reference liquid level precision is ensured. The water pipe outlet of the inner pipe 3 can be designed into an oblique angle, the amplitude angle is increased, the accumulation of bubbles is reduced, and the bubbles in the inner pipe 3 can be timely removed at the beginning of an experiment.
Referring to FIGS. 1-4, in steps S2-S3, the static level sensor 12 measures an initial value when the liquid level of the calibration bowl 5 is at the level of the reference mark 51. When the displacement platform 6 moves different distances, the static level sensor 12 obtains corresponding measurement values. The hydrostatic level 1 and the displacement platform 6 are started, and when the liquid level is at the level of the reference graduation mark 51 in the calibration pot 5, the corresponding sensor value Y0 is acquired. The displacement platform 6 is set to stably move the liquid level for a fixed distance at fixed intervals, and the corresponding sensor capacitance Yn is measured.
Referring to fig. 1 and 4, in step S4, the displacement gauge 4 obtains the actual displacement value of the liquid level in the calibration bowl 5. And setting the moving and collecting times according to the total liquid level moving range and the single moving distance. Where the range of movement of the displacement means is, for example, ± 6mm, the means may produce a displacement of, for example, 40 μm, and the change in plasma level within the hydrostatic level 1 may be, for example, 20 μm, moving upwards from an initial position of-6 mm to +6 mm. The sensor values Y1 and Y2 … Yn of the whole process are recorded and stored, and the displacement meter 4 obtains the actually measured displacement distance delta H.
Referring to fig. 1 and 4, in step S5, the actual displacement value measured by the displacement gauge is curve-fitted to the static level sensor measurement value. According to the principle of a communicating vessel, when the displacement platform 6 generates the displacement of H, the liquid level height in the static leveling pot body changes by H/2, and meanwhile, the displacement meter 4 is utilized to measure the actual liquid level change. And recording the actual displacement change value and the measured value of the static level sensor, and fitting a function relation curve.
Referring to fig. 5 and 6, when an experiment is performed on a calibration system by using the calibration method of the hydrostatic level provided by the invention, the experiment site is selected from a first floor which is not easily affected by vibration, and a high-precision optical platform is used as an experiment platform. The experimental environment is set to be constant temperature, and the influence of temperature change on water volume expansion is shielded. Deionized water was used, and dispersant and formalin aids were added as the water for the experiment. The obtained experimental data are fitted to obtain a curve schematic diagram of capacitance variation with displacement, fig. 5 is a curve schematic diagram of capacitance variation with displacement, and fig. 6 is a partial enlarged diagram of capacitance variation.
Referring to fig. 1, 5 and 6, the high-precision displacement stage may change the height of the plasma water level in the hydrostatic level 1 by 20 μm, for example, moving upward from an initial position of-6 mm to +6mm, synchronously recording the capacitance value corresponding to each displacement point, and the schematic diagram of the capacitance variation curve with displacement is shown in fig. 5, which satisfies the range index. Fig. 6 is a partially enlarged view of a variation curve of the capacitance value in the present embodiment.
Referring to fig. 7 and 8, in the present embodiment, fig. 7 is a schematic diagram of a fitting curve, and fig. 8 is a schematic diagram of a fitting curve residual. And processing the measured data, and fitting a relation curve. The fitted curve may form the following relationship:
and a, b, c and d are fitting coefficients, x is a measured value obtained by measuring the static level sensor, and y is an actual displacement value of the liquid level in the calibration pot body. In this embodiment, the fitting coefficient a is 28199.95462, b is 68877.59665, c is 8.77896, and d is 0.02776, and the maximum residual error of curve fitting is 27.11482 μm.
Referring to FIGS. 1-8, deionized water is added to the reference mark 51 of the interior of the calibration bowl 5, and the value of the sensor at the reference mark 51 corresponding to the measured liquid level is Y0. The displacement platform 6 is controlled to move upwards, namely the liquid level in the calibration pot body 5 moves downwards. If the displacement platform 5 moves upwards for a distance H each time, according to the principle of the communicating vessel, the liquid level in the pot body 5 is calibrated to move downwards for H/2 each time. The actual displacement Δ H is measured by the displacement meter 4, and the values of the corresponding static level sensor 12 are measured as Y1 and Y2 … Yn, and the curve of the value Y measured by the static level sensor 12 and the displacement distance Δ H conforms to a functional relationship. The calibration method is used for testing the hydrostatic level 1 in the embodiment, the movement range of the displacement platform 6 may be, for example, -6mm to +6mm, the displacement platform 6 may generate, for example, a displacement of 40 μm, the change in the water level of the plasma in the hydrostatic level 1 may be, for example, 20 μm, the plasma moves upwards from an initial position of-6 mm to +6mm, and the capacitance value and the displacement change value corresponding to each displacement point are synchronously recorded. And finally, curve fitting is carried out on the actual displacement value measured by the displacement meter 4 and the sensor measurement value, the relation between the sensor measurement value and the displacement of the hydrostatic level can be strictly calibrated, the accurate measurement of liquid level change is realized, and the measurement precision of the hydrostatic level 1 is improved.
In summary, the invention provides a calibration system and a calibration method of a hydrostatic level, which eliminate abbe errors by arranging the axes of the calibration bowl body and the displacement platform on the same straight line. And measuring the actual liquid level change by using a displacement meter, and recording the actual displacement change value and the measured value of the static level sensor to fit a functional relation curve. The method realizes strict calibration of the relation between the measurement value and the displacement of the static level sensor, accurately measures the change value of the liquid level, and improves the measurement precision of the static level gauge. The method is simple to operate, has reliable results, correspondingly reduces the measurement cost, and improves the measurement efficiency and accuracy.
The above description is only a preferred embodiment of the present application and a description of the applied technical principle, and it should be understood by those skilled in the art that the scope of the present invention related to the present application is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the present application. Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.
Claims (10)
1. A calibration system for a hydrostatic level comprising:
the static force level gauge is arranged on the lifting platform and provided with a static force level sensor;
the calibration pot body is arranged on the displacement platform and provided with a reference scale mark, the initial heights of the calibration pot body and the static level are the same, and the lifting platform is positioned on one side of the displacement platform;
the connecting inner pipe is used for connecting the static water level and the calibration pot body;
and the displacement meter is arranged on the calibration pot body and used for measuring the actual position of the liquid level in the calibration pot body.
2. A calibration system for a hydrostatic level according to claim 1 wherein the internal floor areas of the hydrostatic level and the calibration bowl are the same.
3. A calibration system for a hydrostatic level according to claim 1 wherein the displacement platform is movable in a direction perpendicular to the horizontal.
4. A calibration system for a hydrostatic level according to claim 1 wherein the central axes of the calibration bowl and the displacement platform are collinear.
5. The calibration system according to claim 1, wherein said connecting inner tube is a soft silicone connecting tube.
6. A calibration system for a hydrostatic level according to claim 1 or claim 5 wherein the outlet of the water tube to which the inner tube is connected is bevelled.
7. A calibration system for a hydrostatic level according to claim 1 wherein the central axes of the displacement gauge and the calibration bowl are collinear.
8. A method of calibrating a hydrostatic level using the calibration system of claim 1, comprising:
adjusting the lifting platform to enable the initial heights of the calibration pot body and the static level to be the same;
acquiring an initial numerical value of the static level sensor;
obtaining the measurement value of the static force level sensor when the calibration bowl body is at different liquid level heights;
acquiring an actual displacement value of the liquid level in the calibration pot body;
fitting the actual displacement value measured by the displacement gauge to the hydrostatic level sensor measurement value.
9. The method of calibrating a hydrostatic level of claim 8, wherein the initial value of the hydrostatic level sensor is obtained when the liquid level of the calibration bowl is at the level of the reference graduation mark.
10. A method of calibrating a hydrostatic level as claimed in claim 8, wherein the non-linear representation of the curve fit is:
and a, b, c and d are fitting coefficients, x is a measured value obtained by measurement of the static leveling sensor, and y is an actual displacement value of the liquid level in the calibration bowl body.
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Cited By (1)
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| CN113551645A (en) * | 2021-07-09 | 2021-10-26 | 安徽创谱仪器科技有限公司 | Static leveling device and measuring system thereof |
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