Non-contact level meter calibration system and calibration method thereof

Abstract

The invention discloses a non-contact level meter calibration system which comprises a calibration workbench used for adjusting the space attitude of a non-contact level meter to be calibrated, and an adjusting mechanism of the calibration workbench comprises a lifting mechanism, a first pitching mechanism and a first rotating mechanism. A calibration reflection target is fixedly arranged in front of the workbench in a fan-shaped mode, and the calibration reflection target comprises a second pitching mechanism and a second rotating mechanism; the plurality of laser range finders are distributed on the base, and each laser range finder is provided with a third pitching mechanism and a third rotating mechanism; by adjusting a third pitching mechanism and a third rotating mechanism of the laser range finder, vertical calibration of the laser range finder and the reference surface can be realized. By adjusting a second pitching mechanism and a second rotating mechanism for calibrating the reflection target, the reflection target can be vertically aligned with the light path of the laser range finder. According to the invention, the precision uncertainty caused by a traditional linear motion mechanism is avoided, the complexity of vertical calibration is simplified, the calibration precision and the equipment stability are remarkably improved, and high-precision calibration on the premise of cost control is realized.

Description

Technical Field

[0001] This invention relates to the technical field of non-contact level gauge calibration, and particularly to a non-contact level gauge calibration system and calibration method thereof. Background Technology

[0002] Non-contact level gauge calibration systems are widely used in modern industry, especially in the production and testing of high-precision non-contact level gauges, laser sensors, and other measuring equipment. To ensure that non-contact level gauges provide accurate measurement results, calibration before shipment is an essential step. Existing non-contact level gauge calibration methods typically rely on a fixed calibration platform and a calibration reflective target, as well as auxiliary measurements using a laser rangefinder. The accuracy of the calibration directly affects the performance and reliability of the non-contact level gauge.

[0003] Existing non-contact level gauge calibration methods have the following shortcomings:

[0004] The accuracy issues of traditional calibration systems. Most existing non-contact level gauge calibration systems rely on mechanical transmission systems (such as gears and guide rails) to move the reflective target. However, due to inherent errors in mechanical transmission systems, such as gear backlash, friction, and motion instability, the accuracy of the reflective target cannot remain stable over the long term during calibration, thus affecting the calibration accuracy of the non-contact level gauge. Especially in the calibration of high-precision non-contact level gauges, traditional calibration systems may fail to provide sufficient accuracy, easily leading to calibration errors.

[0005] The calibration process is complex. Existing calibration systems typically require complex mechanical design and high-precision machining, making installation, adjustment, and maintenance difficult and costly. Especially in adjusting the position and angle of the calibrated reflector, current technologies often employ manual or semi-automatic methods, resulting in low efficiency and difficulty in guaranteeing accuracy.

[0006] The adaptability of calibration equipment is poor. Most current non-contact level gauge calibration systems have a relatively simple design, requiring cumbersome adjustments and configurations to adapt to the calibration requirements of different models and types of non-contact level gauges. Because calibration equipment is usually custom-designed, its scalability and flexibility are poor, making it impossible for different types of non-contact level gauge calibration systems to share calibration platforms and equipment.

[0007] Cost and environmental requirements. Traditional calibration systems use expensive equipment and precision mechanical components, such as linear motors and marble platforms. This not only increases the manufacturing cost of the system but also places high demands on the operating environment. Some calibration systems also require operation under special environmental conditions, such as strict control of temperature and humidity, which further increases the cost of use. Summary of the Invention

[0008] To address the aforementioned problems in the prior art, this invention provides a non-contact level gauge calibration system and calibration method to solve the above-mentioned technical problems.

[0009] To achieve the above objectives, a non-contact level gauge calibration system is provided according to a first aspect of the present invention, comprising:

[0010] The calibration worktable includes a base and an adjustment mechanism. The base is provided with a clamping mechanism for holding and fixing the non-contact level gauge to be calibrated. The adjustment mechanism is located below the base and includes a lifting mechanism, a first pitch mechanism and a first rotation mechanism to adjust the spatial attitude of the non-contact level gauge to be calibrated.

[0011] The calibration target is fixedly arranged in a fan shape in front of the calibration workbench. The calibration target includes a second pitch mechanism and a second rotation mechanism.

[0012] Multiple laser rangefinders are distributed on a plane on the base perpendicular to the axis of the non-contact level gauge to be calibrated, and each laser rangefinder is equipped with a third pitch mechanism and a third rotation mechanism.

[0013] By adjusting the third pitch and third rotation mechanisms, multiple laser rangefinders are vertically calibrated to the reference plane. Similarly, by adjusting the second pitch and second rotation mechanisms of the calibration reflector, the optical path of the calibration reflector is vertically aligned with that of the laser rangefinder. Through the coordinated operation of these components and the adjustability of the physical structure, vertical calibration of the laser rangefinder with the reference plane and the reflector with the laser optical path is achieved. This avoids the accuracy uncertainties caused by linear motion mechanisms (such as gears and racks) in traditional solutions, providing a foundation for the precise calibration of non-contact level gauges.

[0014] In some specific embodiments, the calibration worktable further includes a square box, a lifting mechanism mounted on the square box, a first rotation mechanism mounted on the lifting mechanism, and a first pitch mechanism mounted on the first rotation mechanism. This arrangement provides a stable and controllable adjustment method, ensuring that the attitude adjustment of the non-contact level gauge to be calibrated can be performed accurately and reliably, which is the basis for subsequent calibration steps.

[0015] In some specific embodiments, the calibration target further includes a support and a target adjustment device. The second pitch mechanism is mounted on the second rotation mechanism, the support is mounted on the second rotation mechanism, the target is mounted on the support, and the target adjustment device is located at the mating point between the support and the target. This structural design makes the adjustment of the target more flexible and precise.

[0016] In some specific embodiments, three laser rangefinders are used: one is mounted on the upper surface of the base, and the other two are mounted on the base via columns. This arrangement achieves "three points on one surface," ensuring the feasibility and accuracy of the vertical calibration process.

[0017] In some specific embodiments, the reflective target adjustment device is a three-point adjustment device. This configuration greatly simplifies the vertical alignment work that originally required high-precision machining and complex calibration, making operation simple, cost-effective, and achieving high-precision calibration results.

[0018] In some specific embodiments, a non-contact level gauge calibration reference plate is also provided on the base, and laser adjustment reflectors are set on the non-contact level gauge calibration reference plate corresponding to multiple laser rangefinders. This structural component provides a stable reference and accurate reflection point for the vertical calibration of the laser rangefinder, which is the basis for realizing calibration and ensures the reliability of the calibration process.

[0019] In some specific embodiments, the base is also provided with a limiting fixture for constraining the range of the non-contact level gauge wave, and the limiting fixture is positioned in front of the non-contact level gauge to be calibrated. This structure can effectively isolate external noise interference, ensuring that the non-contact level gauge only receives signals from the reflecting target during the calibration process, thereby improving the accuracy and anti-interference capability of the non-contact level gauge calibration measurement.

[0020] In some specific embodiments, a slider assembly is provided on the base, and the fixture is movably mounted on the slider assembly. This arrangement facilitates the adjustment of the position of the fixture.

[0021] According to a second aspect of the present invention, a calibration method for a non-contact level gauge calibration system as described above is provided, comprising the following steps:

[0022] S1: Adjust the third pitch mechanism and the third rotation mechanism of multiple laser rangefinders to calibrate the laser rangefinders perpendicularly to the reference plane;

[0023] S2: Adjust the second pitch mechanism, the second rotation mechanism, and the three-point adjustment device of the calibration reflector to make the calibration reflector perpendicularly aligned with the optical path of the laser rangefinder;

[0024] S3: Fix the non-contact level gauge to be calibrated on the clamping mechanism of the calibration worktable, and use the adjustment mechanism to adjust the spatial attitude of the non-contact level gauge to be calibrated so that the non-contact level gauge is aligned with the reflective target.

[0025] S4: The calibration process of the non-contact level gauge is completed by using feedback data from the laser rangefinder and adjusting the calibration reflective target.

[0026] In some specific embodiments, the calibration process of S4 specifically includes: receiving measurement data from the laser rangefinder and the non-contact level gauge to be calibrated via a host computer, calculating correction values, and writing the correction values ​​into the circuit board of the non-contact level gauge. Through data processing and correction value calculation by the host computer, the calibration process of the non-contact level gauge is automated and intelligent, and the correction results are directly written into the non-contact level gauge circuit board, greatly improving work efficiency and calibration accuracy.

[0027] In summary, the advantages of this invention compared to the prior art are as follows:

[0028] This application's non-contact level gauge calibration system abandons the traditional linear motion mechanism, employing a fan-shaped fixed target and an adjustable pitch / rotation mechanism. This avoids accuracy degradation caused by mechanical wear and backlash, ensuring high precision and long-term stability during calibration. Utilizing the "three points on one surface" principle, the vertical alignment of the reflective target is guided by readings from a laser rangefinder. This transforms the calibration challenge, which originally relied on high-precision machining, into a simple and intuitive physical adjustment, significantly reducing the complexity and cost of the calibration process. Through the data processing capabilities of the host computer, a fully automated process from data acquisition to correction value writing is achieved, significantly improving calibration efficiency and reducing errors caused by manual operation. The use of wave-limiting fixtures in the non-contact level gauge ensures the purity of the calibration results, making them less susceptible to external environmental interference, thus improving equipment performance and product quality. Attached Figure Description

[0029] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Other features, objects, and advantages of this application will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of a non-contact level gauge calibration system according to an embodiment of the present invention;

[0031] Figure 2 This is a top view of a non-contact level gauge calibration system according to a specific embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the calibration workbench according to a specific embodiment of the present invention;

[0033] Figure 4This is a schematic diagram of the structure of a non-contact level gauge calibration reflective target according to a specific embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of laser vertical adjustment according to a specific embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the vertical adjustment of a non-contact level gauge reflective target according to a specific embodiment of the present invention;

[0036] Figure 7 This is a schematic flowchart of a non-contact level gauge calibration method according to an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram illustrating the principle of non-contact level gauge calibration according to an embodiment of the present invention.

[0038] Figure reference numerals: 100-calibration workbench, 101-square box, 102-lifting platform, 103-first rotary table, 104-first elevation platform, 105-mounting base plate, 106-slider group, 107-non-contact level gauge emission and reflection wave range limiting fixture, 108-laser rangefinder mounting base plate, 109-laser rangefinder mounting column, 110-third elevation and rotary table, 111-laser rangefinder, 112-calibration non-contact level gauge 113-Contact level gauge support plate A, 114-Non-contact level gauge calibration reference plate, 115-Laser adjustment reflector, 116-Quick clamp, 117-Non-contact level gauge for calibration, 200-Calibration reflector target, 201-Second rotating stage, 202-Second pitch stage, 203-Reflector target bracket, 204-Reflector target adjustment device, 205-Non-contact level gauge reflector plate. Detailed Implementation

[0039] In the description of this invention, it should be noted 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.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "installation," "connection," and "fixation," 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.

[0041] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0042] Figure 1 A schematic diagram of a non-contact level gauge calibration system according to an embodiment of the present invention is shown, as follows: Figure 1 As shown, the system mainly comprises two key components: a calibration workbench 100 and multiple calibration reflective targets 200. The calibration workbench 100 is the core structure of the entire system, used to support and adjust the attitude of the non-contact level gauge to be calibrated. The non-contact level gauges to be calibrated include radar level gauges and ultrasonic level gauges; this application uses a radar level gauge as an example, while the same applies to ultrasonic level gauges. Multiple calibration reflective targets 200 (three in this embodiment) are fixedly arranged in front of the calibration workbench 100. The multiple calibration reflective targets 200 are arranged in a fan shape to ensure that the non-contact level gauge can be calibrated from different angles and directions. The angle and position of each calibration reflective target 200 are adjustable to adapt to different calibration requirements and ensure precise alignment of the reflective target with the optical path of the non-contact level gauge, thereby improving calibration accuracy. This structural design enables the non-contact level gauge calibration system to provide extremely high stability and accuracy during the calibration process, suitable for the calibration needs of various high-precision non-contact level gauge devices. Figure 2 A top view of a non-contact level gauge calibration system according to a specific embodiment of the present invention is shown, as follows: Figure 2 As shown, multiple calibration reflective targets 200 are fixedly arranged in a fan-shaped pattern in front of the calibration workbench 100. This fan-shaped arrangement allows the calibration reflective targets 200 to cover a wide area in front of the calibration workbench 100, ensuring that measurement data from the non-contact level gauge can be effectively collected at different angles. This layout provides a basis for multi-point calibration, improving calibration accuracy and avoiding errors caused by insufficient target position information.

[0043] Figure 3A schematic diagram of the calibration workbench according to a specific embodiment of the present invention is shown, as follows: Figure 3 As shown, the calibration worktable structure includes a square box 101, a lifting platform 102, a first rotary table 103, and a first pitch platform 104. The square box 101 is a casting with a precision-machined surface to ensure sufficient rigidity and stability, providing solid support for other components. The lifting platform 102 is mounted on the square box 101, allowing for the raising and lowering of the calibration worktable to adjust the height of the non-contact level gauge to be calibrated, adapting to the calibration requirements of different non-contact level gauge devices. The first rotary table 103 is mounted on the lifting platform 102 and is used for high-precision rotation. Through precise motor control, the rotary table can accurately rotate the calibration worktable in the horizontal plane, enabling the non-contact level gauge to be calibrated at different angles. The first pitch platform 104 is mounted on the first rotary table 103 and is used to pitch the calibration worktable, ensuring that the non-contact level gauge 117 used for calibration is accurately aligned with the calibration reflective target 200 and the laser rangefinder 111 during the calibration process.

[0044] In a specific embodiment, the overall mounting base 105 of the calibration workbench serves as the mounting foundation for all components. A slider assembly 106 is provided on the base to provide the forward and backward movement function for the non-contact level gauge's emitted and reflected wave range limiting fixture 107. The design of the slider assembly 106 allows the limiting fixture 107 to be adjusted in the horizontal plane, ensuring that the non-contact level gauge wave is limited to the required calibration range, thereby reducing interference from external noise in the calibration process and improving calibration accuracy.

[0045] In a specific embodiment, the base also includes a laser rangefinder mounting plate 108 and a laser rangefinder mounting column 109, providing a mounting position for the laser rangefinder 111. The calibration worktable also includes three third pitch and rotation stages 110, used to adjust the pitch and rotation of the laser rangefinder 111. The laser rangefinder 111 is a high-precision laser rangefinder, serving as one of the core components of the calibration system. It is used to accurately measure the distance between the non-contact level gauge and the calibration reflective target 200, and provides important measurement data for the non-contact level gauge calibration process. Through the collaboration of multiple laser rangefinders, the non-contact level gauge can be calibrated comprehensively and accurately. A non-contact level gauge calibration reference plate 114 is also provided on the mounting plate 105, and a laser adjustment reflector 115 is provided on the calibration reference plate 114 corresponding to the laser rangefinder 111. The calibration workbench also includes a calibration non-contact level gauge support plate A112 and a calibration non-contact level gauge support plate B113 for supporting the calibration non-contact level gauge 117, and a quick-release chuck 116 for fixing the calibration non-contact level gauge 117. This chuck can quickly and easily fix the non-contact level gauge onto the support plate, avoiding the instability of manual operation and further improving the efficiency and accuracy of the calibration process.

[0046] Figure 4 A schematic diagram of a non-contact level gauge calibration reflective target according to a specific embodiment of the invention is shown, such as... Figure 4 As shown, the structure of the calibration reflective target includes a second rotating stage 201, a second elevation stage 202, a reflective target support 203, a reflective target adjustment device 204, and a non-contact level gauge reflector 205. The second rotating stage 201 and the second elevation stage 202 are used to achieve precise rotation and elevation adjustment of the reflective target, ensuring that the reflective target can be accurately adjusted at different angles during calibration. Through these two adjustment mechanisms, the reflective target can flexibly adjust its direction, ensuring that the reflecting surface remains perpendicular to the laser beam of the laser rangefinder 111, thereby providing a stable and accurate reflection signal.

[0047] In a specific embodiment, the reflective target bracket 203 is made of industrial aluminum profile, which is lightweight and sturdy, and can effectively support the entire reflective target assembly. The bracket design ensures the stability of the reflective target during the calibration process and can withstand the adjustment torque of the reflective target adjustment device without deformation, thus guaranteeing the long-term stability of the calibration.

[0048] In a specific embodiment, the reflective target adjustment device 204 is an important component of the reflective target, and its main function is to achieve perpendicular alignment between the reflective target and the optical path of the laser rangefinder. This adjustment device employs a three-point adjustment method. Through precise three-point adjustment technology, it ensures high-standard fine-tuning accuracy of the reflective target, avoiding instability factors in traditional adjustment methods, thereby improving the reliability and accuracy of the calibration process.

[0049] In a specific embodiment, the non-contact level gauge reflector 205, as the core component of the reflective target, has a reflective surface designed to meet high flatness requirements, ensuring that the reflective surface can uniformly and stably reflect the laser beam during the non-contact level gauge calibration process. The reflector is made of high-quality materials and has excellent reflective characteristics, effectively reflecting the beam emitted by the laser rangefinder and returning it to the rangefinder to complete the distance measurement. This reflective target design is not only simple and efficient in structure, but also improves calibration accuracy through a precise adjustment mechanism, avoiding errors caused by uneven reflective surfaces or improper adjustment in traditional calibration systems. Through this design, the non-contact level gauge calibration system of this invention can reduce complex adjustment operations while ensuring high-precision calibration, providing an efficient and stable non-contact level gauge calibration solution.

[0050] Figure 5 A schematic diagram of laser vertical adjustment according to a specific embodiment of the present invention is shown, such as... Figure 5 As shown, by adjusting the third pitch and rotation stage 110 of the laser rangefinder 111, the laser beam of the laser rangefinder 111, after being reflected by the laser adjustment reflector 115, can align the reflected light spot with the emission port of the laser rangefinder, thereby achieving vertical calibration between the laser rangefinder and the reference plane. This precise adjustment method ensures the optical path of the laser rangefinder, avoiding errors caused by optical path deviation during calibration. The laser adjustment reflector 115 plays a crucial role in this process, accurately achieving vertical calibration by reflecting the laser beam and ensuring the overlap of the light spot with the emission port. This adjustment method effectively guarantees the measurement accuracy of the laser rangefinder during calibration, providing a precise optical path reference for subsequent calibration steps. Through this high-precision optical adjustment, the present invention ensures the perpendicularity between the laser rangefinder and the reference plane, thus laying a solid foundation for the entire non-contact level gauge calibration process.

[0051] Figure 6 A schematic diagram of the vertical adjustment of a non-contact level gauge reflective target according to a specific embodiment of the present invention is shown, such as... Figure 6As shown, after completing the laser vertical calibration, the system uses the laser rangefinder 111 as a reference and further adjusts the second pitch mechanism 201, the second rotation mechanism 202, and the three-point adjustment device 204 of the calibration reflective target 200 by observing the ranging readings of the three laser rangefinders 111. This adjustment process ensures that the reflective surface of the reflective target is vertically aligned with the optical path of the laser rangefinder. During this process, when the readings of the three laser rangefinders 111 are consistent, it indicates that the reflective plate of the reflective target is completely vertically aligned with the laser optical path. At this point, the precise adjustment of the target not only ensures the accuracy of the reflected signal but also improves the reliability of the calibration process. Precise adjustment of the reflective target is crucial to avoiding calibration errors caused by angular deviations, ensuring the accuracy of each measurement point, thereby completing the high-precision calibration of the non-contact level gauge. The aforementioned vertical adjustment method provides multi-point feedback; through continuous measurement and adjustment of the laser rangefinder, fine adjustments can be made at different positions, greatly improving the stability and accuracy of the calibration process.

[0052] Figure 7 A schematic flowchart of a non-contact level gauge calibration method according to an embodiment of the present invention is shown, as follows: Figure 7 As shown, the calibration method includes the following steps:

[0053] S1: Adjust the third pitch mechanism and the third rotation mechanism of multiple laser rangefinders to calibrate the laser rangefinders perpendicularly to the reference plane.

[0054] S2: Adjust the second pitch mechanism, the second rotation mechanism, and the three-point adjustment device of the calibration reflector to make the calibration reflector perpendicularly aligned with the optical path of the laser rangefinder.

[0055] S3: Fix the non-contact level gauge to be calibrated on the clamping mechanism of the calibration worktable, and use the adjustment mechanism to adjust the spatial attitude of the non-contact level gauge to be calibrated so that the non-contact level gauge is aligned with the reflective target.

[0056] S4: The calibration process of the non-contact level gauge is completed by using feedback data from the laser rangefinder and adjusting the calibration reflective target.

[0057] Figure 8 A schematic diagram illustrating the principle of non-contact level gauge calibration according to a specific embodiment of the present invention is shown, such as... Figure 8 As shown, the specific principle of calibration for this non-contact level gauge is as follows:

[0058] Step 1: Upload the laser rangefinder data and the calibration non-contact level gauge distance measurement data to the host computer.

[0059] During this stage, the laser rangefinder 111 and the calibration non-contact level gauge 117 begin data acquisition. The laser rangefinder 111 acquires the distance data between itself and the calibration reflective target in real time using a high-precision measuring device, while the calibration non-contact level gauge 117 acquires the distance data between itself and the target object or reflective target. This measurement data is uploaded to the host computer in the system via a data transmission interface. The host computer, as the core unit of data processing, is responsible for receiving, storing, and managing all measurement data, ensuring that the system can obtain high-precision calibration data.

[0060] Step 2: The host computer calculates and obtains the correction value, and writes it back to calibrate the non-contact level gauge.

[0061] After acquiring all measurement data, the host computer processes and analyzes this data. The host computer calculates corresponding correction values, which are based on the error between the laser rangefinder and the calibrated non-contact level gauge. These correction values, after calculation, are written back into the non-contact level gauge calibration system, thereby adjusting the parameters of the non-contact level gauge equipment to ensure that calibration errors are corrected and that the equipment is in optimal operating condition. This process effectively improves calibration accuracy and makes the performance of the non-contact level gauge equipment more stable and reliable.

[0062] Step 3: Print the report and certificate of conformity.

[0063] After completing the corrections and ensuring calibration accuracy, the system automatically generates a detailed calibration report and outputs a certificate of conformity according to the set standards. The report includes all measurement data, the correction process, and the calibration results, recording every step of the entire calibration process in detail to ensure data integrity and transparency. Finally, a certificate of conformity is printed as proof of the equipment's calibration success, providing a valid basis for subsequent use and maintenance.

[0064] The non-contact level gauge calibration method of this invention ensures high-precision calibration of the non-contact level gauge through a series of precise adjustment steps. First, the third pitch mechanism and third rotation mechanism of multiple laser rangefinders are adjusted to achieve perpendicular calibration of the laser rangefinders and the reference plane of the non-contact level gauge calibration reference plate, providing a reliable reference for subsequent calibration. Next, the non-contact level gauge calibration reference plate is removed, and the second pitch mechanism, second rotation mechanism, and three-point adjustment device of the calibration reflective target are adjusted to ensure that the reflective target and the optical path of the laser rangefinder are perfectly aligned perpendicularly, thereby improving measurement accuracy. Subsequently, the non-contact level gauge to be calibrated is fixed on the clamping mechanism of the worktable, and the spatial attitude of the non-contact level gauge is precisely adjusted through the adjustment mechanism to ensure precise alignment between the non-contact level gauge and the reflective target. Finally, using the feedback data from the laser rangefinder and the adjustment of the reflective target, the final calibration process is completed, ensuring that the accuracy and performance of the non-contact level gauge meet the standards. Through these steps, the calibration method effectively improves the stability and measurement accuracy of non-contact level gauges, ensuring that the calibration process is efficient and accurate.

[0065] In this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] 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.

[0067] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A non-contact level gauge calibration system, characterized in that, include: The calibration worktable includes a base and an adjustment mechanism. The base is provided with a clamping mechanism for clamping and fixing the non-contact level gauge to be calibrated. The adjustment mechanism is located below the base and includes a lifting mechanism, a first pitch mechanism and a first rotation mechanism to adjust the spatial attitude of the non-contact level gauge to be calibrated. A calibration reflector is fixedly arranged in a fan-shaped manner in front of the calibration workbench. The calibration reflector includes a second pitch mechanism and a second rotation mechanism. Multiple laser rangefinders are distributed on the base on a plane perpendicular to the axis of the non-contact level gauge to be calibrated, and each laser rangefinder is provided with a third pitch mechanism and a third rotation mechanism. By adjusting the third pitch mechanism and the third rotation mechanism, the plurality of laser rangefinders are made to be perpendicularly calibrated to the reference plane; by adjusting the second pitch mechanism and the second rotation mechanism of the calibration reflector, the calibration reflector is made to be perpendicularly aligned with the optical path of the laser rangefinder.

2. The non-contact level gauge calibration system according to claim 1, characterized in that, The calibration workbench also includes a square box, the lifting mechanism is disposed on the square box, the first rotation mechanism is disposed on the lifting mechanism, and the first pitch mechanism is disposed on the first rotation mechanism.

3. The non-contact level gauge calibration system according to claim 1, characterized in that, The calibration target also includes a support and a target adjustment device. The second pitch mechanism is mounted on the second rotation mechanism, the support is mounted on the second rotation mechanism, the target is mounted on the support, and the target adjustment device is located at the mating point between the support and the target.

4. The non-contact level gauge calibration system according to claim 1, characterized in that, The laser rangefinder is configured with three units, one of which is located on the upper surface of the base, and the other two are mounted on the base via columns.

5. The non-contact level gauge calibration system according to claim 3, characterized in that, The target adjustment device is a three-point adjustment device.

6. The non-contact level gauge calibration system according to claim 1, characterized in that, The base is also provided with a non-contact level gauge calibration reference plate, and the non-contact level gauge calibration reference plate is provided with laser adjustment reflectors corresponding to multiple laser rangefinders.

7. The non-contact level gauge calibration system according to claim 1, characterized in that, The base is also provided with a limiting fixture for constraining the range of the non-contact level gauge wave, and the limiting fixture is located in front of the non-contact level gauge to be calibrated.

8. The non-contact level gauge calibration system according to claim 7, characterized in that, A slider assembly is provided on the base, and the limiting fixture is movably disposed on the slider assembly.

9. A calibration method for a non-contact level gauge calibration system as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Adjust the third pitch mechanism and the third rotation mechanism of the multiple laser rangefinders to calibrate the laser rangefinders perpendicularly to the reference plane; S2: Adjust the second pitch mechanism, the second rotation mechanism, and the three-point adjustment device of the calibration reflective target so that the calibration reflective target is perpendicularly aligned with the optical path of the laser rangefinder; S3: Fix the non-contact level gauge to be calibrated on the clamping mechanism of the calibration worktable, and use the adjustment mechanism to adjust the spatial attitude of the non-contact level gauge to be calibrated so that the non-contact level gauge is aligned with the reflective target. S4: The calibration process of the non-contact level gauge is completed by using the feedback data from the laser rangefinder and the adjustment of the calibration reflective target.

10. The calibration method as described in claim 9, characterized in that, The calibration process of S4 specifically includes: receiving measurement data from the laser rangefinder and the non-contact level gauge to be calibrated via a host computer, calculating correction values, and writing the correction values ​​into the circuit board of the non-contact level gauge to be calibrated.

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