Static leveling instrument calibration device and method, storage medium and controller

Abstract

The invention discloses a static leveling instrument calibration device and method, a storage medium and a controller. The static leveling instrument calibration device comprises a liquid level communication tank; a first reference liquid level tank; a second reference liquid level tank; a liquid supply metering module; the first movable distance measuring module comprises a first moving assembly and a first laser distance measuring instrument; the second movable distance measuring module comprises a second moving assembly and a second laser distance measuring instrument; the controller is used for controlling the liquid supply metering module to perform quantitative liquid injection for multiple times, and according to a first current liquid level value measured by the laser range finder after each time of liquid injection, a second current liquid level value measured by the second laser range finder and an output value generated by each to-be-calibrated static force level gauge, calibration parameters of each to-be-calibrated static force level gauge are determined; and when the measuring range of the to-be-calibrated hydrostatic level gauge is greater than that of the first laser range finder, controlling the moving assembly to adjust the measuring range of the laser range finder according to the current liquid level value, and controlling the second moving assembly to adjust the measuring range of the second laser range finder according to the second current liquid level value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of static leveling instrument calibration, and particularly relates to a static leveling instrument calibration device and method, a storage medium and a controller. BACKGROUND

[0002] The static leveling instrument is used for measuring and monitoring the difference and change amount of the vertical height between reference points, based on the principle that the liquid in the connected containers always seeks the same potential energy. The static leveling instrument is widely used in the field of measurement due to its high measurement accuracy. In particular, the static leveling instrument plays an important role in large-scale precision engineering measurement, such as monitoring the vertical position change of a hydropower station, a nuclear power station, and a large-scale scientific research project.

[0003] However, the static leveling instrument needs to be calibrated before leaving the factory or in the case of inaccurate measurement due to some reasons. The related calibration method mainly realizes the calibration of a single static leveling instrument by using a grating ruler, a linear displacement table and other tools. However, the measurement accuracy of the grating ruler and other tools is not high enough, and the efficiency is not high when calibrating a large number of static leveling instruments with large ranges or high accuracy. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide a static leveling instrument calibration device, which realizes the calibration of a large number of static leveling instruments with high accuracy and / or large range, and has the advantages of high calibration efficiency, high calibration accuracy and the ability to calibrate a large range of static leveling instruments.

[0005] A second object of the present application is to provide a static leveling instrument calibration method.

[0006] A third object of the present application is to provide a computer-readable storage medium.

[0007] A fourth object of the present application is to provide a controller.

[0008] To achieve the above objectives, a first aspect of the present invention provides a hydrostatic level calibration device, the device comprising: a liquid level communication tank connected to a plurality of hydrostatic levels to be calibrated; a first reference liquid level tank connected to the liquid level communication tank; a second reference liquid level tank connected to the liquid level communication tank, wherein the liquid level communication tank, the first reference liquid level tank, the second reference liquid level tank, and each of the hydrostatic levels to be calibrated are on the same horizontal plane; a liquid supply metering module connected to the liquid level communication tank for injecting liquid into the liquid level communication tank, the first reference liquid level tank, the second reference liquid level tank, and each of the hydrostatic levels to be calibrated; a first movable distance measuring module comprising a first moving component and a first laser distance measuring instrument, the first laser distance measuring instrument being used to measure the vertical liquid level value of the liquid in the first reference liquid level tank; and a second movable distance measuring module comprising a second moving component and a second laser distance measuring instrument, the second laser distance measuring instrument being used to measure the vertical liquid level value of the liquid in the first reference liquid level tank; and a second movable distance measuring module comprising a second moving component and a second laser distance measuring instrument, the second laser distance measuring instrument being used to measure the vertical liquid level value of the liquid in the first reference liquid level tank. The rangefinder is used to measure the vertical liquid level in the second reference liquid level tank; the controller, electrically connected to the hydrostatic level to be calibrated, the liquid supply metering module, the first moving component, the first laser rangefinder, the second moving component, and the second laser rangefinder, is used to control the liquid supply metering module to perform multiple quantitative liquid injections. Based on the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder, and the output value generated by each hydrostatic level to be calibrated after each injection, the calibration parameters of each hydrostatic level to be calibrated are determined. When the range of the hydrostatic level to be calibrated is greater than the range of the first laser rangefinder, the controller controls the first moving component to adjust the measurement range of the first laser rangefinder based on the first current liquid level value, and controls the second moving component to adjust the measurement range of the second laser rangefinder based on the second current liquid level value.

[0009] According to an embodiment of the present invention, a hydrostatic level calibration device connects multiple hydrostatic levels to be calibrated and two reference liquid level tanks to a liquid level communication tank. A quantitative liquid is injected multiple times into the liquid level communication tank, the reference liquid level tank, and the hydrostatic levels to be calibrated by controlling the liquid supply metering module. Based on the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder, and the output value generated by each hydrostatic level to be calibrated after each injection, the calibration parameters of each hydrostatic level to be calibrated are determined. Furthermore, during the injection process, the first moving component is controlled to adjust the measurement range of the first laser rangefinder based on the first current liquid level value, and the second moving component is controlled to adjust the measurement range of the second laser rangefinder based on the second current liquid level value. This device has the advantages of high calibration efficiency, high calibration accuracy, and the ability to calibrate a large number of hydrostatic levels.

[0010] In addition, the hydrostatic level calibration device proposed in the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, the controller is configured to, before controlling the liquid supply metering module to perform quantitative liquid injection, control the liquid supply metering module to inject liquid into the liquid level communication tank, and when the liquid level in the hydrostatic level to be calibrated is at the reference liquid level, control the first moving component to adjust the lowest point of the range of the first laser rangefinder to the liquid level in the first reference liquid level tank, and control the second moving component to adjust the lowest point of the range of the second laser rangefinder to the liquid level in the second reference liquid level tank.

[0011] According to one embodiment of the present invention, the controller is configured to control the liquid supply metering module to inject liquid according to a preset single liquid injection volume, a preset number of injections, and an injection time interval, and after each injection, collect the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder, and the output value generated by each of the hydrostatic level instruments to be calibrated; calculate the liquid level difference between the first current liquid level value and the second current liquid level value; if the liquid level difference is greater than or equal to a preset difference threshold, then stop the calibration of each hydrostatic level instrument to be calibrated; if the liquid level difference is less than a preset difference threshold, then stop the calibration of each hydrostatic level instrument to be calibrated. If a threshold is set, the liquid level change after each injection is calculated based on the initial liquid level value and the first current liquid level value measured by the first laser rangefinder after each injection. The initial liquid level value is the liquid level value measured by the laser rangefinder when the liquid surface in the hydrostatic level to be calibrated is at the reference liquid level. For each hydrostatic level to be calibrated, a preset fitting function is used to perform nonlinear curve fitting based on the liquid level change after each injection and the output value of the hydrostatic level to be calibrated after each injection, and the calibration parameters of the hydrostatic level to be calibrated are calculated to obtain the calibration parameters of each hydrostatic level to be calibrated.

[0012] According to one embodiment of the present invention, the liquid supply metering module includes: a storage tank for storing liquid; a metering pump, the inlet of which is connected to the storage tank via a water pipe; a solenoid valve, the inlet of which is connected to the outlet of the metering pump via a water pipe; and a one-way valve, the inlet of which is connected to the outlet of the solenoid valve via a water pipe, and the outlet of which is connected to the first inlet of the liquid level communication tank via a water pipe; wherein, the controller is electrically connected to the metering pump and the solenoid valve, and is used to control the solenoid valve to open and the metering pump to start during liquid injection; and to control the metering pump to shut down and the solenoid valve to close when the liquid level in the hydrostatic level to be calibrated is at the reference level, or when the single injection volume reaches the preset single liquid injection volume.

[0013] According to one embodiment of the present invention, both the first moving component and the second moving component include a linear displacement stage, and both the first movable ranging module and the second movable ranging module include: a support platform for fixing the linear displacement stage thereon; the linear displacement stage for adjusting the vertical height of the laser rangefinder mounted thereon; wherein, the controller is connected to the first linear displacement stage of the first moving component and the second linear displacement stage of the second moving component, and is used to determine whether the first current liquid level value is greater than or equal to a preset liquid level threshold after each injection, and to determine whether the first current liquid level value is greater than or equal to a preset liquid level threshold. When the preset liquid level threshold is reached, the first linear displacement stage and the second linear displacement stage are respectively controlled to move the first laser rangefinder and the second laser rangefinder vertically upward by a displacement corresponding to a preset range. Then, the lowest point of the range of the first laser rangefinder and the second laser rangefinder is adjusted to the liquid surface of the liquid in the first reference liquid level tank and the second reference liquid level tank, respectively. The preset liquid level threshold is less than or equal to the maximum range of the laser rangefinder. The preset range is the range of the first laser rangefinder, and the range of the first laser rangefinder is the same as the range of the second laser rangefinder.

[0014] According to one embodiment of the present invention, the expression of the preset fitting function is:

[0015] in, The change in liquid level; The output value generated by the hydrostatic level to be calibrated; , , , The calibration parameters are as described above.

[0016] According to one embodiment of the present invention, the liquid level communication tank includes multiple air outlets and multiple water outlets. The multiple air outlets of the liquid level communication tank are respectively connected to the air inlet of the corresponding hydrostatic level instrument to be calibrated, the first reference liquid level tank, and the second reference liquid level tank via air pipes. The multiple water outlets of the liquid level communication tank are respectively connected to the water inlet of the corresponding hydrostatic level instrument to be calibrated, the first reference liquid level tank, and the second reference liquid level tank via water pipes.

[0017] To achieve the above objectives, a second aspect of the present invention provides a method for calibrating a hydrostatic level, used in a hydrostatic level calibration device as described in the first aspect of the present invention. The method includes: controlling a liquid supply metering module to perform multiple quantitative liquid injections; determining calibration parameters for each hydrostatic level to be calibrated based on a first current liquid level value measured by a first laser rangefinder, a second current liquid level value measured by a second laser rangefinder, and an output value generated by each hydrostatic level to be calibrated after each injection; and when the range of the hydrostatic level to be calibrated is greater than the range of the laser rangefinder, controlling a first moving component to adjust the measurement range of the laser rangefinder based on the first current liquid level value and controlling a second moving component to adjust the measurement range of the second laser rangefinder based on the second current liquid level value.

[0018] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the hydrostatic level calibration method as proposed in the second aspect of the present invention.

[0019] To achieve the above objectives, a fourth aspect of the present invention provides a controller, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the hydrostatic level calibration method as proposed in the second aspect of the present invention.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a hydrostatic level calibration device according to an embodiment of the present invention; Figure 2 This is a two-dimensional schematic diagram of a hydrostatic level calibration device according to a specific embodiment of the present invention; Figure 3 This is a three-dimensional schematic diagram of a hydrostatic level calibration device according to a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the interface between a liquid level communication tank, a reference liquid level tank, and a hydrostatic level to be calibrated, according to a specific embodiment of the present invention. Figure 5 This is a flowchart of a hydrostatic level calibration method according to an embodiment of the present invention; Figure 6 This is a structural block diagram of the controller according to an embodiment of the present invention.

[0022] Explanation of icon numbers: 1. First linear displacement stage; 2. Second laser rangefinder; 3. Second linear displacement stage; 4. First laser rangefinder; 5. Liquid level communication tank; 6. Static level to be calibrated; 7. First reference liquid level tank; 8. Second reference liquid level tank; 9. Air pipe; 10. Water pipe; 11. Water pipe plug; 12. Air pipe plug; 14. Storage tank; 15. Metering pump; 16. Solenoid valve; 17. Check valve; 18. First support platform; 19. Second support platform; 20. Horizontal worktable; 21. Controller; 51. First water inlet; 52. First water outlet; 53. First air outlet; 61. Second water inlet; 62. Second air inlet; 63. Second water outlet; 64. Second air outlet; 71. Third water inlet; 72. Third air inlet; 81. Fourth water inlet; 82. Fourth air inlet. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The static level calibration device, method, storage medium, and controller of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of a hydrostatic level calibration device according to an embodiment of the present invention. Figure 1 As shown, the hydrostatic level calibration device may include: The liquid level connecting tank 5 is connected to multiple hydrostatic levels 6 to be calibrated. The first reference liquid level tank 7 is connected to the liquid level communication tank 5; The second reference level tank 8 is connected to the level communication tank 5. The level communication tank 5, the first reference level tank 7, the second reference level tank 8 and each hydrostatic level instrument 6 to be calibrated are on the same horizontal plane. The liquid supply metering module is connected to the liquid level connecting tank 5 and is used to inject liquid into the liquid level connecting tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8 and the hydrostatic level instrument 6 to be calibrated. The first movable ranging module includes a first moving component and a first laser rangefinder 4. The first laser rangefinder 4 is used to measure the vertical liquid level value of the liquid in the first reference liquid level tank 7. The second movable ranging module includes a second moving component and a second laser rangefinder 2. The second laser rangefinder is used to measure the vertical liquid level value of the liquid in the second reference liquid level tank 8. The controller 21 is electrically connected to the hydrostatic level 6 to be calibrated, the liquid supply metering module, the first moving component, the first laser rangefinder 4, the second moving component, and the second laser rangefinder 2. It is used to control the liquid supply metering module to perform multiple quantitative liquid injections. Based on the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output value generated by each hydrostatic level 6 to be calibrated after each injection, it determines the calibration parameters of each hydrostatic level 6 to be calibrated. When the range of the hydrostatic level 6 to be calibrated is greater than the range of the first laser rangefinder 4, it controls the first moving component to adjust the measurement range of the first laser rangefinder 4 based on the first current liquid level value, and controls the second moving component to adjust the measurement range of the second laser rangefinder 2 based on the second current liquid level value.

[0026] To calibrate hydrostatic levels in large quantities, this embodiment of the invention connects multiple hydrostatic levels 6 to be calibrated to a liquid level communication tank 5, and also sets up two reference liquid level tanks (a first reference liquid level tank 7 and a second reference liquid level tank 8) connected to the liquid level communication tank 5. The liquid level communication tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8, and each hydrostatic level 6 to be calibrated are placed on the same horizontal plane, so that when liquid is injected into the liquid level communication tank 5, the liquid inside the liquid level communication tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8, and each hydrostatic level 6 to be calibrated are on the same equipotential surface.

[0027] To achieve high-precision calibration of hydrostatic levels, this embodiment of the invention includes a liquid supply metering module. By controlling the liquid supply metering module to inject a fixed amount of liquid into the liquid level connecting tank 5, the liquid injected into the liquid level connecting tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8, and each hydrostatic level 6 to be calibrated is precisely controlled.

[0028] To achieve high-precision calibration of the hydrostatic level, this embodiment of the invention employs a dual-reference system by setting up two movable ranging modules: a first movable ranging module and a second movable ranging module. Specifically, the liquid level value of the first reference liquid level tank measured by the first laser rangefinder 4 in the first movable ranging module is used to calibrate the hydrostatic level 6 to be calibrated. The liquid level value of the second reference liquid level tank measured by the second laser rangefinder 2 in the second movable ranging module is used to determine whether the first laser rangefinder 4 has made a measurement error, thereby reducing measurement errors during the calibration process.

[0029] To calibrate the static level 6 to be calibrated, the liquid level inside the first reference liquid level tank 7 is measured using the first laser rangefinder 4 in the first movable distance measuring module. This allows the liquid level inside each static level 6 to be calibrated to be obtained. The change in liquid level in the first reference liquid level tank 7 is the change in liquid level of each static level 6 to be calibrated.

[0030] To prevent calibration errors caused by a malfunction of the first laser rangefinder 4, the second laser rangefinder 2 in the second movable ranging module is used to measure the liquid level inside the second reference liquid level tank 8. The first current liquid level value measured by the first laser rangefinder 4 and the second current liquid level value measured by the second laser rangefinder 2 are compared to determine whether the first laser rangefinder 4 has made a measurement error.

[0031] After each injection, the system collects the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output values ​​generated by each static level 6 to be calibrated. Based on these measurements, it determines whether the first laser rangefinder 4 is accurate. Once accurate, the calibration parameters for each static level 6 are calculated using the first current liquid level value measured by the first laser rangefinder 4 and the output values ​​generated by each static level 6. These calculated calibration parameters are then written into the corresponding static level 6, thus completing the calibration of each static level 6.

[0032] To achieve large-range static level calibration, the movable distance measuring module in this embodiment of the invention can adjust the vertical height of the laser rangefinder by controlling the moving component, thereby adjusting the measurement range of the laser rangefinder.

[0033] Specifically, the liquid supply metering module injects a fixed amount of liquid multiple times into the liquid level connecting tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8, and the static level instrument 6 to be calibrated. After each injection, the module collects the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output value generated by each static level instrument 6 to be calibrated. Based on the first current liquid level value measured by the first laser rangefinder 4 and the second current liquid level value measured by the second laser rangefinder 2, it is determined whether the measurement by the first laser rangefinder 4 is accurate. After confirming accuracy, the calibration parameters of each static level instrument 6 to be calibrated are determined based on the first current liquid level value measured by the first laser rangefinder 4 and the output values ​​generated by each static level instrument 6 to be calibrated, as well as the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output values ​​generated by each static level instrument 6 to be calibrated.

[0034] It should be noted that before calibrating multiple static levels 6, the measuring range of each static level 6 is obtained. If the measuring range of the static level 6 is greater than the measuring range of the first laser rangefinder 4, after each liquid injection, it is determined whether the vertical height of the first laser rangefinder 4 needs to be adjusted based on the current liquid level value. If it is determined that the vertical height of the first laser rangefinder 4 needs to be adjusted, the first moving component is controlled to adjust the vertical height of the first laser rangefinder 4 to adjust its measuring range. After adjusting the measuring range of the laser rangefinder 4, the second moving component also needs to be controlled to adjust the vertical height of the second laser rangefinder 2 to adjust its measuring range.

[0035] It should be noted that, Figure 1 The black dashed lines in the diagram represent electrical connections, and the black solid lines represent pipeline connections. Specifically, the level connection tank 5 is connected to the first reference level tank 7, the second reference level tank 8, and each hydrostatic level instrument 6 to be calibrated via pipelines. The liquid supply metering module is connected to the level connection tank 5 via pipelines.

[0036] The hydrostatic level calibration device of this invention has a first reference liquid level tank 7, a second reference liquid level tank 8, and multiple hydrostatic levels 6 to be calibrated, all connected to a liquid level communication tank 5. By controlling the liquid supply metering module to inject a quantitative amount of liquid into the liquid level communication tank 5 multiple times, the calibration parameters of each hydrostatic level 6 to be calibrated are determined based on the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output value generated by each hydrostatic level 6 to be calibrated after each injection. During the injection process, the first moving component and the second moving component are controlled to adjust the measurement range of the first laser rangefinder 4 and the second laser rangefinder 2 respectively according to the first current liquid level value. It has the advantages of high calibration efficiency, high calibration accuracy, and the ability to calibrate a large number of hydrostatic levels.

[0037] In one specific embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the static level calibration device includes: a horizontal worktable 20 for providing a horizontal platform, and a first reference liquid level tank 7, a second reference liquid level tank 8, a liquid level connecting tank 5 and a static level to be calibrated 6 installed on the horizontal worktable 20.

[0038] Specifically, the main function of the horizontal worktable 20 is to provide a horizontal platform to ensure that the liquid level communication tank 5 and the static level instrument 6 to be calibrated installed on it are on the same horizontal plane, thereby reducing measurement errors.

[0039] In one specific embodiment of the present invention, such as Figure 3 and 4As shown, the liquid level connecting tank 5 includes multiple first air outlet ports 53 and multiple first water outlet ports 52. The multiple first air outlet ports 53 of the liquid level connecting tank 5 are respectively connected to the air inlet ports of the corresponding static level instrument 6 to be calibrated, the first reference liquid level tank 7, and the second reference liquid level tank 8 through air pipes 9. The multiple first water outlet ports 52 of the liquid level connecting tank 5 are respectively connected to the water inlet ports of the corresponding static level instrument 6 to be calibrated, the first reference liquid level tank 7, and the second reference liquid level tank 8 through water pipes 10.

[0040] The static level instrument 6 to be calibrated may include a second water inlet 61, a second air inlet 62, a second water outlet 63, and a second air outlet 64. The first reference level tank 7 includes a third water inlet 71 and a third air inlet 72. The second reference level tank 8 may include a fourth water inlet 81 and a fourth air inlet 82. The second air inlet 62 of each static level instrument 6 to be calibrated is connected to the first air outlet 53 of the level communication tank 5 via an air pipe 9. The second water inlet 61 of the static level instrument 6 to be calibrated is connected to the first water outlet 52 of the level communication tank 5 via a water pipe 10. Similarly, the first reference level tank 7 and the second reference level tank 8 are connected to the level communication tank 5 via air pipes 9 and via water pipes 10, respectively.

[0041] It should be noted that, Figures 1-4 The diagram shows only that the liquid level connecting tank 5 has four first vent ports 53 and four first water outlet ports 52. The liquid level connecting tank 5 has at least three first vent ports 53 and four first water outlet ports 52.

[0042] When the number of the first air outlet 53 and the first water outlet 52 of the liquid level connecting tank 5 is three, that is, the liquid level connecting tank 5 can directly connect two reference liquid level tanks and one hydrostatic level. Multiple hydrostatic levels 6 to be calibrated can be connected in series. The first hydrostatic level 6 to be calibrated is connected to the liquid level connecting tank 5. A water pipe plug 11 needs to be installed at the second water outlet 63 of the last hydrostatic level 6 to be calibrated, and an air pipe plug 12 needs to be installed at the second air outlet 64. See [reference needed]. Figure 4 .

[0043] When there are a large number of first air outlet ports 53 and first water outlet ports 52 in the liquid level connecting tank 5, the liquid level connecting tank 5 can directly connect two reference liquid level tanks and multiple static levels. When the liquid level connecting tank 5 is insufficient to directly connect multiple static levels to be calibrated, the extra static levels to be calibrated can be connected in series and then connected to the liquid level connecting tank 5. For static levels 6 not connected in series, or for static levels 6 connected at the end, the second water outlet port 63 needs to be fitted with a water pipe plug 11, and the second air outlet port 64 needs to be fitted with an air pipe plug 12. The main function of the air pipe plug 12 and the water pipe plug 13 is to seal the second water outlet port 63 and the second air outlet port 64 of static levels 6 not connected in series, or static levels 6 connected at the end. See [link to documentation]. Figure 4 .

[0044] After the first reference level tank 7, the second reference level tank 8, and each static level instrument 6 to be calibrated are connected to the level communication tank 5 through the air pipe 6 and the water pipe 10, the liquid inside the level communication tank 5, the first reference level tank 7, the second reference level tank 8, and each static level instrument 6 to be calibrated can be at the same equipotential surface. The laser rangefinder 4 reflects the liquid level height of the entire calibration system by measuring the liquid level height of the first reference level tank 7.

[0045] It should be noted that when calibrating multiple static levels 6 to be calibrated, each static level 6 to be calibrated is a static level of the same type and with the same range.

[0046] In this embodiment of the invention, the lowest scale line of the hydrostatic level 6 to be calibrated is recorded as the reference liquid level of the hydrostatic level 6 to be calibrated.

[0047] In one embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the liquid supply metering module may include: Storage tank 14 is used to store liquids; Metering pump 15, the inlet of metering pump 15 is connected to storage tank 14 through water pipe 10; Solenoid valve 16, the inlet of solenoid valve 16 is connected to the outlet of metering pump 15 through water pipe 10; One-way valve 17, the inlet of the one-way valve 17 is connected to the outlet of the solenoid valve 10 through a water pipe 10, and the outlet of the one-way valve 17 is connected to the first water inlet 51 of the liquid level communication tank 5 through a water pipe to prevent liquid backflow. The controller 21 is electrically connected to the metering pump 15 and the solenoid valve 16. It is used to control the solenoid valve 16 to open and the metering pump 15 to start during liquid injection. When the liquid level in the hydrostatic level 6 to be calibrated is at the reference liquid level, or when the single injection volume reaches the preset single liquid injection volume, it controls the metering pump 15 to shut down and the solenoid valve 16 to close.

[0048] Specifically, the main function of the storage tank 14 is to store liquid and provide liquid supply for the calibration of the first reference level tank 7, the second reference level tank 8, the level communication tank 5, and the static level instrument 6 to be calibrated. The main function of the one-way valve 17 is to prevent the liquid in the first reference level tank 7, the second reference level tank 8, the level communication tank 5, and the static level instrument 6 to be calibrated from flowing back to the solenoid valve 16. Under the control of the controller 21, the solenoid valve 16 and the metering pump 15 inject liquid quantitatively from the storage tank 14 into the level communication tank 5. The liquid injected into the level communication tank 5 can flow to the first reference level tank 7, the second reference level tank 8, and each static level instrument 6 to be calibrated, respectively.

[0049] During liquid injection, controller 21 controls solenoid valve 16 to open and metering pump 15 to start, so that liquid in storage tank 14 flows into first reference level tank 7, second reference level tank 8, level communication tank 5 and each static level instrument 6 to be calibrated.

[0050] When the liquid level in the hydrostatic level 6 to be calibrated is at the reference level, the controller 21 controls the metering pump 15 to shut down and the solenoid valve 16 to close, so as to stop the injection of liquid into the first reference level tank 7, the second reference level tank 8, the level connecting tank 5 and each hydrostatic level 6 to be calibrated.

[0051] When the single injection volume reaches the preset single injection volume, the controller 21 controls the metering pump 15 to shut down and the solenoid valve 16 to close, so as to stop the injection of liquid into the first reference liquid level tank 7, the second reference liquid level tank 8, the liquid level connecting tank 5 and each static level instrument 6 to be calibrated.

[0052] In one embodiment of the present invention, such as Figure 2 and Figure 3As shown, both the first moving component and the second moving component can include a linear displacement stage. Both the first movable ranging module and the second movable ranging module can include: a support platform for fixing the linear displacement stage on it; and a linear displacement stage for adjusting the vertical height of the laser rangefinder mounted on it. The controller 21 is connected to the first linear displacement stage 3 of the first moving component and the second linear displacement stage 1 of the second moving component. After each liquid injection, it determines whether the first current liquid level value is greater than or equal to a preset liquid level threshold. When the first current liquid level value is greater than or equal to the preset liquid level threshold, it controls the first linear displacement stage 3 and the second linear displacement stage 1 to move the first laser rangefinder 4 and the second laser rangefinder 2 vertically upwards by a displacement corresponding to a preset range. Then, it adjusts the lowest point of the range of the first laser rangefinder 4 and the second laser rangefinder 2 to the liquid surface in the first reference liquid level tank 7 and the second reference liquid level tank 8, respectively. The preset liquid level threshold is less than or equal to the maximum range of the laser rangefinder. The preset range is the range of the first laser rangefinder, and the range of the first laser rangefinder is the same as the range of the second laser rangefinder.

[0053] It should be noted that in this embodiment of the invention, the first laser rangefinder 4 and the second laser rangefinder 2 are laser rangefinders of the same specification. The lowest point of the measuring range of the first laser rangefinder 4 is the measuring point corresponding to the minimum value of the measuring range of the first laser rangefinder 4. The lowest point of the measuring range of the second laser rangefinder 2 is the measuring point corresponding to the minimum value of the measuring range of the second laser rangefinder 2.

[0054] Specifically, a first support platform 18 and a second support platform 19 are respectively provided on the horizontal worktable 20. The first support platform 18 and the second support platform 19 are installed on the upper surface of the horizontal worktable 20, and the first support platform 18 is located on one side of the first reference liquid level tank 7. The first support platform 18 provides a mounting and fixing plane for the first linear displacement stage 3, and the first linear displacement stage 3 can be mounted and fixed on the first support platform 18. The first laser rangefinder 4 is mounted and fixed on the first linear displacement stage 3, and its measurement range can be adjusted by vertically moving the first linear displacement stage 3. The second support platform 19 provides a mounting and fixing plane for the second linear displacement stage 1, and the second linear displacement stage 1 can be mounted and fixed on the second support platform 19. The second laser rangefinder 2 is mounted and fixed on the second linear displacement stage 1, and its measurement range can be adjusted by vertically moving the first linear displacement stage 1.

[0055] It should be noted that when fixing the laser rangefinder, the center of the laser rangefinder and the center of the reference liquid level tank must be on the same vertical line. Furthermore, the first linear displacement stage 3 and the second linear displacement stage 1 need to be adjusted via controller 21 to ensure that the measuring range of the first laser rangefinder 4 and the second laser rangefinder 2 includes the measuring range of the hydrostatic level 6 to be calibrated. That is, when the liquid level in each hydrostatic level 6 to be calibrated is at the reference liquid level, the lowest point of the measuring range of the first laser rangefinder 4 and the second laser rangefinder 2 is adjusted to the liquid level in the reference liquid level tank.

[0056] When the range of the hydrostatic level 6 to be calibrated is greater than the range of the first laser rangefinder 4, after each liquid injection, it is determined whether the first current liquid level value measured by the first laser rangefinder 4 is greater than or equal to a preset liquid level threshold. If the first current liquid level value is less than the preset liquid level threshold, the determination is repeated after the next liquid injection. If the first current liquid level value is greater than or equal to the preset liquid level threshold, the first linear displacement stage 3 is controlled to move the first laser rangefinder 4 vertically upward by a displacement corresponding to the range of the laser rangefinder. To accurately measure the liquid level value after the next liquid injection, the second linear displacement stage 1 is controlled again to adjust the lowest point of the range of the second laser rangefinder 2 to the liquid surface in the second reference liquid level tank 8. When the first laser rangefinder 4 measures the liquid level value after the movement, the liquid level value corresponding to the movement of the first laser rangefinder 4 will be accumulated, and the accumulated liquid level value will be recorded as the first current liquid level value.

[0057] For example, when the measuring range of the first laser rangefinder 4 is ±3.7 mm, the range of the first laser rangefinder 4 can be determined to be 7.40 mm. When the range of the hydrostatic level 6 to be calibrated is 12.00 mm, since the range of the hydrostatic level 6 to be calibrated is greater than the range of the first laser rangefinder 4, a preset liquid level threshold is set before calibrating the hydrostatic level 6 to be calibrated. For example, the preset liquid level threshold can be set to 3.69 mm. After each liquid injection, it is determined whether the first current liquid level value is greater than or equal to 3.69 mm. If the first current liquid level value is equal to 3.69 mm, it means that the difference between the first current liquid level value and the initial liquid level value is equal to... To further measure liquid levels exceeding the range of the laser rangefinder 4, the first linear displacement stage 3 is controlled to move the first laser rangefinder 4 vertically upwards by 7.40 mm. Then, the first linear displacement stage 3 is controlled again to adjust the lowest point of the range of the first laser rangefinder 4 to the liquid surface in the first reference liquid level tank 7. After refilling, the current liquid level value measured by the first laser rangefinder 4 needs to be increased by 7.39 mm to obtain the current vertical liquid level value in the first reference liquid level tank 7. In this embodiment, the laser rangefinder 4 has a range accuracy of less than 1.81 μm, resulting in more accurate measurements.

[0058] It should be noted that the embodiments of the present invention do not limit the range of the laser rangefinder, the range of the hydrostatic level to be calibrated, or the preset liquid level threshold. The preset liquid level threshold can be set according to actual needs.

[0059] In one embodiment of the present invention, the controller 21 is used to, Before controlling the liquid supply metering module to perform quantitative liquid injection, the liquid supply metering module is controlled to inject liquid into the liquid level communication tank. When the liquid level in the hydrostatic level to be calibrated is at the reference liquid level, the first moving component is controlled to adjust the lowest point of the range of the first laser rangefinder to the liquid level in the first reference liquid level tank, and the second moving component is controlled to adjust the lowest point of the range of the second laser rangefinder to the liquid level in the second reference liquid level tank.

[0060] Specifically, when calibrating multiple static levels 6 to be calibrated, the liquid supply metering module is controlled to inject liquid into the liquid level connecting tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8, and the static levels 6 to be calibrated. Injection stops when the liquid level in each static level 6 is at the reference liquid level. Then, the first moving component is controlled to adjust the lowest point of the range of the first laser rangefinder 4 to the liquid level in the first reference liquid level tank 7, and the second moving component is controlled to adjust the lowest point of the range of the second laser rangefinder 2 to the liquid level in the second reference liquid level tank 8.

[0061] When the liquid level in each of the static level instruments 6 to be calibrated is at the reference liquid level, and the lowest point of the range of the first laser rangefinder 4 is at the liquid level in the first reference liquid level tank 7, and the lowest point of the range of the second laser rangefinder 2 is at the liquid level in the second reference liquid level tank 8, the liquid supply metering module is controlled to inject a quantitative amount of liquid multiple times into the liquid level connecting tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8 and the static level instrument 6 to be calibrated.

[0062] In one embodiment of the present invention, the controller 21 is used to, The liquid supply metering module is controlled to inject liquid according to the preset single liquid injection volume, preset injection number and injection time interval. After each injection, the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2 and the output value generated by each static level 6 to be calibrated are collected. Calculate the liquid level difference between the first current liquid level value and the second current liquid level value; If the liquid level difference is greater than or equal to the preset difference threshold, the calibration of each hydrostatic level to be calibrated will be stopped. If the liquid level difference is less than the preset difference threshold, the liquid level change after each injection is calculated based on the initial liquid level value and the first current liquid level value measured by the first laser rangefinder 4 after each injection. The initial liquid level value is the liquid level value measured by the laser rangefinder 4 when the liquid surface in the hydrostatic level 6 to be calibrated is at the reference liquid level. For each static level 6 to be calibrated, a nonlinear curve is fitted using a preset fitting function based on the liquid level change after each injection and the output value of the static level 6 after each injection. The calibration parameters of the static level 6 to be calibrated are then calculated, and the calibration parameters of each static level 6 to be calibrated are obtained.

[0063] In one specific embodiment of the present invention, the expression of the preset fitting function is:

[0064] in, This represents the change in liquid level. This is the output value; , , , These are calibration parameters.

[0065] Specifically, the controller 21 is electrically connected to the second linear displacement stage 1, the second laser rangefinder 2, the first linear displacement stage 3, the first laser rangefinder 4, each static level to be calibrated 6, the solenoid valve 16, and the metering pump 15. It is used to control the operation of the second linear displacement stage 1, the first linear displacement stage 3, the solenoid valve 16, and the metering pump 15, and to read the output values ​​of the first laser rangefinder 4, the second laser rangefinder 2, and the static level to be calibrated 6.

[0066] In this embodiment of the invention, the preset single liquid injection volume, preset number of injections, and injection time interval can be determined based on the range of the laser rangefinder 4 and the range of the hydrostatic level 6 to be calibrated.

[0067] When the liquid level in each of the hydrostatic level instruments 6 to be calibrated is at the reference level, the lowest point of the range of the first laser rangefinder 4 is at the liquid level in the first reference level tank 7, and the lowest point of the range of the second laser rangefinder 2 is at the liquid level in the second reference level tank 8, the current liquid level value measured by the first laser rangefinder 4 is recorded as y0=0, the liquid level change Δy0 is recorded as 0, and the output value generated by each hydrostatic level instrument 6 to be calibrated is recorded as... 0, where n≥2, and n represents the number of hydrostatic level instruments 6 to be calibrated.

[0068] The controller 21 controls the solenoid valve 16 and the metering pump 15 to inject liquid into the liquid level communication tank 5 and each static level instrument 6 to be calibrated, according to the preset single liquid injection volume, preset injection number, and injection time interval. After each injection, it collects the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output value generated by each static level instrument 6 to be calibrated. It then calculates the liquid level threshold between the first current liquid level value measured by the first laser rangefinder 4 and the second current liquid level value measured by the second laser rangefinder 2.

[0069] If the liquid level difference is greater than or equal to the preset difference threshold, the calibration of each hydrostatic level to be calibrated will be stopped.

[0070] If the liquid level difference is less than the preset difference threshold, the first current liquid level value measured by the first laser rangefinder 4 is recorded as yi (i=0,1,2,…), where i represents the preset number of injections, and the liquid level change Δyi=yi-y0 (i=0,1,2,…). The output value of the hydrostatic level 6 to be calibrated is recorded as… i (i=0,1,2……).

[0071] Compare the liquid level change Δyi with the output value of each hydrostatic level instrument 6 to be calibrated. Substituting i into the preset fitting function Perform nonlinear curve fitting to obtain the values ​​of a, b, c, and d. Write the values ​​of a, b, c, and d corresponding to each static level 6 to be calibrated, and complete the calibration of the corresponding static level 6.

[0072] The preset fitting function in the embodiments of the present invention is obtained through a large number of experiments.

[0073] The present invention verifies the error of the hydrostatic level after calibration using the above calibration method, and verifies that the full-range error accuracy of the calibrated hydrostatic level is less than 5 μm (micrometers).

[0074] This invention uses a capacitive hydrostatic level as an example to describe the implementation process of the hydrostatic level calibration device of this invention: Place the first reference level tank 7, the second reference level tank 8, the level connecting tank 5, and the static level instrument 6 to be calibrated on the horizontal workbench 21. Connect the air and water circuits of the first reference level tank 7, the second reference level tank 8, the level connecting tank 5, and the static level instrument 8 through air and water pipes, respectively. Connect the metering pump 15, the solenoid valve 16, and the level connecting tank 5 through the water pipe. Connect the metering pump 15 to the storage tank 14 through the water pipe.

[0075] Adjust the first laser rangefinder 4 so that its center is on a vertical line with the center of the first reference liquid level tank 7. Adjust the second laser rangefinder 2 so that its center is on a vertical line with the center of the second reference liquid level tank 8. Adjust the first linear displacement stage 3 and the second linear displacement stage 1 through the controller 21 to ensure that the measuring range of the first laser rangefinder 4 and the second laser rangefinder 2 includes the measuring range of the hydrostatic level 6 to be calibrated.

[0076] The controller 21 controls the metering pump 15 and the solenoid valve to inject liquid into the liquid level communication tank 5, the hydrostatic level to be calibrated 6, the first reference liquid level tank 7, and the second reference liquid level tank 8, ensuring that the liquid level is at the reference liquid level of the hydrostatic level to be calibrated 6. After setting the single liquid injection volume, injection frequency, and injection time interval of the metering pump 17 on the controller 21, the test begins.

[0077] After the metering pump 17 and solenoid valve 16 inject water into the reference level tank, the level connecting tank and the hydrostatic level each time, the controller 21 collects the first current level value recorded by the first laser rangefinder 4, the second current level value recorded by the second laser rangefinder 2, and the capacitance output value of each hydrostatic level 6 to be calibrated. After determining that the level thresholds of the first current level value and the second current level value are both less than the preset difference threshold, the controller 21 performs fitting processing based on the level value collected by the first laser rangefinder 4 and the capacitance output value of the hydrostatic level to complete the calibration of the hydrostatic level.

[0078] Based on the above method, this embodiment calibrates a capacitive hydrostatic level by using a preset fitting function from this embodiment to determine the calibration parameters of the capacitive hydrostatic level. Goodness of fit R 2 The value is 0.99999, and relevant accuracy tests were conducted using the obtained calibration parameters of the capacitive hydrostatic level. The test data are shown in Table 1 below: Table 1 shows the verification test results for a calibrated capacitive hydrostatic level.

[0079] The hydrostatic level calibration device of this invention uses a linear displacement stage and a laser rangefinder to achieve adjustable measurement range of the laser rangefinder, enabling calibration of hydrostatic levels with a large range. A reference liquid level tank and a liquid level communication tank are connected to the hydrostatic level to be calibrated via water and air pipes, ensuring the entire system is on an equipotential surface. The laser rangefinder measures the liquid level in the reference liquid level tank, reflecting the liquid level in the hydrostatic level to be calibrated, thus enabling the calibration of a large number of hydrostatic levels. A combination of a metering pump and a solenoid valve is used to supply water, realistically simulating the rise in liquid level within the hydrostatic level to be calibrated, improving measurement accuracy. A controller controls the metering pump and solenoid valve to inject water at timed and quantitative intervals and read the liquid level values ​​from the laser rangefinder and the output values ​​from the hydrostatic level, achieving automated and highly efficient calibration. Water pipes connect the solenoid valve and metering pump to the water circuit of the hydrostatic level being calibrated, enabling external quantitative water supply during calibration.

[0080] This invention utilizes a laser rangefinder to achieve real-time and accurate measurement of the liquid level of a calibrated hydrostatic level; a linear displacement stage allows adjustment of the laser rangefinder's measurement range, enabling calibration of hydrostatic levels with different ranges; a metering pump and solenoid valve enable timed and quantitative simulation of the liquid level rise in the calibrated hydrostatic level, improving the reliability and accuracy of calibration and achieving automated calibration; a horizontal worktable, water pipes, and air pipes allow for simultaneous calibration of multiple hydrostatic levels, improving measurement efficiency.

[0081] This invention provides a method for calibrating a hydrostatic level.

[0082] The hydrostatic level calibration method of this invention is used in the hydrostatic level calibration device described above.

[0083] Figure 5 This is a flowchart of a hydrostatic level calibration method according to an embodiment of the present invention. Figure 5 As shown, the calibration method for a hydrostatic level may include: S101, control the liquid supply metering module to perform multiple quantitative liquid injections, and determine the calibration parameters of each static level to be calibrated based on the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder, and the output value generated by each static level to be calibrated after each injection. When the range of the static level to be calibrated is greater than the range of the laser rangefinder, control the first moving component to adjust the measurement range of the first laser rangefinder based on the first current liquid level value, and control the second moving component to adjust the measurement range of the second laser rangefinder based on the second current liquid level value.

[0084] Specifically, the liquid supply metering module injects a fixed amount of liquid multiple times into the liquid level connecting tank 5, the first reference liquid level tank 7, the second reference liquid level tank 8, and the static level instrument 6 to be calibrated. After each injection, the module collects the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output value generated by each static level instrument 6 to be calibrated. Based on the first current liquid level value measured by the first laser rangefinder 4 and the second current liquid level value measured by the second laser rangefinder 2, it is determined whether the measurement by the first laser rangefinder 4 is accurate. After confirming accuracy, the calibration parameters of each static level instrument 6 to be calibrated are determined based on the first current liquid level value measured by the first laser rangefinder 4 and the output values ​​generated by each static level instrument 6 to be calibrated, as well as the first current liquid level value measured by the first laser rangefinder 4, the second current liquid level value measured by the second laser rangefinder 2, and the output values ​​generated by each static level instrument 6 to be calibrated.

[0085] It should be noted that before calibrating multiple static levels 6, the measuring range of each static level 6 is obtained. If the measuring range of the static level 6 is greater than the measuring range of the first laser rangefinder 4, after each liquid injection, it is determined whether the vertical height of the first laser rangefinder 4 needs to be adjusted based on the current liquid level value. If it is determined that the vertical height of the first laser rangefinder 4 needs to be adjusted, the first moving component is controlled to adjust the vertical height of the first laser rangefinder 4 to adjust its measuring range. After adjusting the measuring range of the laser rangefinder 4, the second moving component also needs to be controlled to adjust the vertical height of the second laser rangefinder 2 to adjust its measuring range.

[0086] It should be noted that other specific embodiments of the hydrostatic level calibration method provided in the embodiments of the present invention can be found in other specific embodiments of the hydrostatic level calibration device of the above embodiments of the present invention.

[0087] The static level calibration method of this invention, based on the above-mentioned static level calibration device, can realize the calibration of a large number of high-precision and / or large-range static levels, and has the advantages of high calibration efficiency, high calibration accuracy, and the ability to calibrate a large number of static levels.

[0088] This invention provides a computer-readable storage medium.

[0089] In this embodiment, a computer program is stored on a computer-readable storage medium, and when the computer program is executed by a processor, it implements the hydrostatic level calibration method described above.

[0090] This invention provides a controller.

[0091] In this embodiment, the controller may include a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the hydrostatic level calibration method described above.

[0092] Figure 6 This is a structural block diagram of the controller according to an embodiment of the present invention.

[0093] like Figure 6 As shown, the controller 500 includes a processor 501 and a memory 503. The processor 501 and the memory 503 are connected, for example, via a bus 502. Optionally, the controller 500 may also include a transceiver 504. It should be noted that in practical applications, the transceiver 504 is not limited to one, and the structure of the controller 500 does not constitute a limitation on the embodiments of the present invention.

[0094] Processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this invention. Processor 501 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0095] Bus 502 may include a pathway for transmitting information between the aforementioned components. Bus 502 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 502 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0096] The memory 503 stores a computer program corresponding to the hydrostatic level calibration method of the above embodiments of the present invention. This computer program is controlled and executed by the processor 501. The processor 501 executes the computer program stored in the memory 503 to implement the content shown in the foregoing method embodiments. Figure 6The controller 500 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0097] The computer-readable storage medium and controller of this invention can realize the calibration of a large number of high-precision and / or large-range static levels, and have the advantages of high calibration efficiency, high calibration accuracy and the ability to calibrate a large number of static levels.

[0098] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0099] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0100] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0101] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0102] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0103] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0104] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0105] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A calibration device for a hydrostatic level, characterized in that, The device includes: The liquid level connection tank is connected to multiple hydrostatic levels to be calibrated. The first reference liquid level tank is connected to the liquid level communication tank; The second reference liquid level tank is connected to the liquid level communication tank, wherein the liquid level communication tank, the first reference liquid level tank, the second reference liquid level tank and each of the hydrostatic level instruments to be calibrated are on the same horizontal plane; The liquid supply metering module is connected to the liquid level communication tank and is used to inject liquid into the liquid level communication tank, the first reference liquid level tank, the second reference liquid level tank and each of the hydrostatic level instruments to be calibrated. The first movable ranging module includes a first moving component and a first laser rangefinder, wherein the first laser rangefinder is used to measure the vertical liquid level value of the liquid in the first reference liquid level tank; The second movable ranging module includes a second moving component and a second laser rangefinder, the second laser rangefinder being used to measure the vertical liquid level value of the liquid in the second reference liquid level tank; The controller is electrically connected to the hydrostatic level to be calibrated, the liquid supply metering module, the first moving component, the first laser rangefinder, the second moving component, and the second laser rangefinder. It controls the liquid supply metering module to perform multiple quantitative liquid injections. Based on the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder, and the output values ​​generated by each hydrostatic level to be calibrated after each injection, it determines the calibration parameters of each hydrostatic level to be calibrated. Furthermore, when the range of the hydrostatic level to be calibrated is greater than the range of the first laser rangefinder, it controls the first moving component to adjust the measurement range of the first laser rangefinder based on the first current liquid level value, and controls the second moving component to adjust the measurement range of the second laser rangefinder based on the second current liquid level value.

2. The hydrostatic level calibration device according to claim 1, characterized in that, The controller is used to control the liquid supply metering module to inject liquid into the liquid level communication tank before controlling the liquid supply metering module to perform quantitative liquid injection, and to control the first moving component to adjust the lowest point of the range of the first laser rangefinder to the liquid level of the first reference liquid level tank when the liquid level in the hydrostatic level to be calibrated is at the reference liquid level, and to control the second moving component to adjust the lowest point of the range of the second laser rangefinder to the liquid level of the second reference liquid level tank.

3. The hydrostatic level calibration device according to claim 1, characterized in that, The controller is used to control the liquid supply metering module to inject liquid according to the preset single liquid injection volume, preset injection number and injection time interval, and to collect the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder and the output value generated by each of the hydrostatic level instruments to be calibrated after each injection. Calculate the liquid level difference between the first current liquid level value and the second current liquid level value; If the liquid level difference is greater than or equal to a preset difference threshold, the calibration of each hydrostatic level to be calibrated shall be stopped. If the liquid level difference is less than the preset difference threshold, then the liquid level change after each injection is calculated based on the initial liquid level value and the first current liquid level value measured by the first laser rangefinder after each injection. The initial liquid level value is the liquid level value measured by the laser rangefinder when the liquid surface in the hydrostatic level to be calibrated is at the reference liquid level. For each of the static levels to be calibrated, a preset fitting function is used to perform linear / nonlinear curve fitting based on the liquid level change after each injection and the output value of the static level to be calibrated after each injection, and the calibration parameters of the static level to be calibrated are calculated to obtain the calibration parameters of each of the static levels to be calibrated.

4. The hydrostatic level calibration device according to claim 3, characterized in that, The liquid supply metering module includes: Liquid storage tanks are used to store liquids. A metering pump, the inlet of which is connected to the storage tank via a water pipe; A solenoid valve, the inlet of which is connected to the outlet of the metering pump via a water pipe; A one-way valve, wherein the inlet of the one-way valve is connected to the outlet of the solenoid valve via a water pipe, and the outlet of the one-way valve is connected to the first inlet of the liquid level communication tank via a water pipe. The controller is electrically connected to the metering pump and the solenoid valve. During liquid injection, it controls the solenoid valve to open and the metering pump to start. When the liquid level in the hydrostatic level to be calibrated is at the reference level, or when the single injection volume reaches the preset single liquid injection volume, it controls the metering pump to shut down and the solenoid valve to close.

5. The hydrostatic level calibration device according to claim 3, characterized in that, Both the first moving component and the second moving component include a linear displacement stage, and both the first movable ranging module and the second movable ranging module include: a support platform for fixing the linear displacement stage on it; the linear displacement stage is used to adjust the vertical height of the laser rangefinder mounted on it; The controller is connected to the first linear displacement stage of the first moving component and the second linear displacement stage of the second moving component. After each injection, it determines whether the first current liquid level value is greater than or equal to a preset liquid level threshold. When the first current liquid level value is greater than or equal to the preset liquid level threshold, it controls the first and second linear displacement stages to move the first and second laser rangefinders vertically upwards by a displacement corresponding to a preset range. Then, it adjusts the lowest point of the range of the first and second laser rangefinders to the liquid surface in the first and second reference liquid level tanks, respectively. The preset liquid level threshold is less than or equal to the maximum range of the laser rangefinder, and the preset range is the range of the first laser rangefinder, which is the same as the range of the second laser rangefinder.

6. The hydrostatic level calibration device according to claim 3, characterized in that, The expression for the preset fitting function is: in, The change in liquid level; The output value generated by the hydrostatic level to be calibrated; , , , The calibration parameters are as described above.

7. The hydrostatic level calibration device according to claim 1, characterized in that, The liquid level communication tank includes multiple air outlets and multiple water outlets. The multiple air outlets of the liquid level communication tank are respectively connected to the air inlet of the corresponding hydrostatic level instrument to be calibrated, the first reference liquid level tank, and the second reference liquid level tank via air pipes. The multiple water outlets of the liquid level communication tank are respectively connected to the water inlet of the corresponding hydrostatic level instrument to be calibrated, the first reference liquid level tank, and the second reference liquid level tank via water pipes.

8. A method for calibrating a hydrostatic level, characterized in that, The method for calibrating a hydrostatic level as described in any one of claims 1-7 comprises: The liquid supply metering module is controlled to perform multiple quantitative liquid injections. Based on the first current liquid level value measured by the first laser rangefinder, the second current liquid level value measured by the second laser rangefinder, and the output value generated by each of the static levels to be calibrated after each injection, the calibration parameters of each static level to be calibrated are determined. When the range of the static level to be calibrated is greater than the range of the laser rangefinder, the first moving component is controlled to adjust the measurement range of the laser rangefinder based on the first current liquid level value, and the second moving component is controlled to adjust the measurement range of the second laser rangefinder based on the second current liquid level value.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the hydrostatic level calibration method as described in claim 8.

10. A controller, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the computer program is executed by the processor, it implements the hydrostatic level calibration method as described in claim 8.

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