Calibration device of high-precision radar level meter
By using multiple reflectors and limiting components in the radar level gauge calibration device, the measurement error caused by target plate movement was solved, and high-precision distance measurement was achieved.
Patent Information
- Application Number
- CN202423035008.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-10
AI Technical Summary
When the current radar level gauge has a large range, it is difficult to ensure the verticality of the target plate during its movement. This results in the verticality error and the range error being superimposed, causing measurement error.
Multiple reflectors are used and set at preset reference points. They are rotated on a fixed bracket via a rotating shaft to the working or non-working calibration position to avoid moving the reflectors. The positional stability is ensured by limiting parts and driving components. The system receives and reflects radar waves to obtain distance measurement values.
This reduces measurement errors, improves the calibration accuracy of radar level gauges, and avoids the problem of error superposition caused by target plate movement.
Smart Images
Figure CN223538387U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of calibration device technology, specifically to a calibration device for a high-precision radar level gauge. Background Technology
[0002] In existing technologies, the calibration of radar level gauges typically involves the radar level gauge emitting a radar signal towards a movable target plate and receiving the reflected signal from the target plate. The calibration distance is then determined based on the distance between the radar level gauge and the target plate. This distance is obtained using a measuring device. However, when the radar level gauge has a large range, calibration requires at least 5 to 10 points, necessitating multiple long-distance movements of the target plate. It is difficult to guarantee accuracy during each of these movements.
[0003] Furthermore, when the measurement range is large, it is difficult to ensure the verticality of the target plate during movement and operation. For example, the verticality error and the range error will be superimposed, resulting in a large measurement error. This will cause the main lobe of the reflected signal to be misaligned with the radar level gauge, thus causing the radar level gauge to have measurement error.
[0004] Therefore, there is a need in the field for a device capable of calibrating radar level gauges with high precision. Utility Model Content
[0005] This invention provides a calibration device for a high-precision radar level gauge, which solves the technical problem that existing target plates are difficult to keep vertical during movement and operation, and that the superposition of verticality error and range error will cause a large measurement error in the calibration process of radar level gauges.
[0006] To achieve the above objectives, this utility model provides a calibration device for a high-precision radar level gauge, comprising multiple reflectors, all of which are located on opposite sides of the radar level gauge, for receiving radar waves emitted by the radar level gauge and reflecting the radar waves to form reflected waves.
[0007] The radar level gauge obtains distance measurement values by emitting radar waves to the reflector and receiving the reflected waves reflected by the reflector. Multiple reflectors are set at multiple preset reference point positions, and the number of reflectors is greater than or equal to the number of preset reference point positions.
[0008] In one possible implementation of this utility model, a plurality of the reflectors are arranged in parallel, and the plurality of the reflectors are perpendicular to the direction of the radar waves emitted by the radar level gauge.
[0009] In one possible implementation of this utility model, when the plurality of reflectors are calibrating a radar level gauge, one of the reflectors is in a working calibration position, while the other reflectors are in a non-working calibration position.
[0010] In one possible implementation of this utility model, the reflector is mounted on a fixed bracket, and the reflector is rotated on the fixed bracket to the working calibration position or the non-working calibration position via a rotating shaft.
[0011] In one possible implementation of this utility model, the rotation of the reflector to the working calibration position or the non-working calibration position is achieved manually or by a drive component.
[0012] In one possible implementation of this utility model, the driving component is a drive motor.
[0013] In one possible implementation of this utility model, a limiting part is further included, which is fixedly disposed on the fixed bracket and is used to limit the rotation of the reflector to the working calibration position.
[0014] In one possible implementation of this utility model, a fixed support plate is provided on the fixed bracket, and the limiting part, the driving component and the rotating shaft are fixedly disposed on the fixed support plate.
[0015] In one possible implementation of this utility model, the fixed bracket includes a first bracket and a second bracket, the first bracket and the second bracket forming an angle, and the first bracket or the second bracket having an angle with the reflector.
[0016] In one possible implementation of this utility model, the first bracket and the second bracket are arranged perpendicularly and adjacent to each other.
[0017] In one possible implementation of this utility model, the angle between the first bracket or the second bracket and the reflector is 45°.
[0018] In one possible implementation of this utility model, the fixed support plate, the limiting part, the driving component and the rotating shaft are arranged in the space area enclosed by the first bracket and the second bracket.
[0019] In one possible implementation of this utility model, the bottom of the fixed bracket is provided with a mounting base.
[0020] In one possible implementation of this utility model, the mounting base is connected to the fixed bracket, and the position of the fixed bracket is adjusted by the mounting base.
[0021] In one possible implementation of this utility model, the radar level gauge is mounted on a mounting platform.
[0022] This invention provides a calibration device for a high-precision radar level gauge, comprising multiple reflectors located opposite the radar level gauge. These reflectors receive radar waves emitted by the radar level gauge and reflect the radar waves to form reflected waves. The radar level gauge obtains distance measurement values by emitting radar waves towards the reflectors and receiving the reflected waves. The multiple reflectors are positioned at preset reference points. By correspondingly positioning multiple reflectors at multiple preset reference points, this invention eliminates the need to move the reflectors during distance measurement. Furthermore, each reflector can rotate to a working calibration position during distance measurement and to a non-working calibration position during non-distance measurement, thereby significantly reducing measurement errors. Attached Figure Description
[0023] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0024] Figure 1 This is a schematic diagram of the structure of a calibration device for a high-precision radar level gauge provided by this utility model. Figure 1 ;
[0025] Figure 2 This is a schematic diagram of the structure of a calibration device for a high-precision radar level gauge provided by this utility model. Figure 2 ;
[0026] Figure 3 This is a schematic diagram of the structure of a calibration device for a high-precision radar level gauge provided by this utility model. Figure 3 ;
[0027] Figure 4 This is a schematic diagram of the structure where the reflector is set at a preset reference point;
[0028] Figure 5 yes Figure 4 A partial structural diagram.
[0029] Summary of attached image labels:
[0030] 1. Radar level gauge; 2. Reflector; 3. Mounting platform
[0031] 4. Fixed bracket 41, first bracket 42, second bracket
[0032] 5. Fixed support plate; 6. Rotating shaft; 7. Limiting part
[0033] 8. Drive component; 9. Mounting base; 91. Threaded assembly
[0034] 92. Supporting feet Detailed Implementation
[0035] The present invention 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 for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.
[0036] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The technical solution of this utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0037] Unless otherwise stated, the exemplary embodiments / exemplifications shown are to be understood as providing exemplary features of various details of ways in which the technical concept of this utility model can be implemented in practice. Therefore, unless otherwise stated, the features of various embodiments / exemplifications may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concept of this utility model.
[0038] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.
[0039] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.
[0040] like Figure 1 and 2As shown, this utility model discloses a calibration device for a high-precision radar level gauge, including multiple reflectors 2. The reflectors 2 are all located opposite the radar level gauge 1, and are used to receive radar waves emitted by the radar level gauge 1 and reflect the radar waves to form reflected waves. The radar level gauge 1 obtains distance measurement values by emitting radar waves to the reflectors 2 and receiving the reflected waves. The multiple reflectors 2 are positioned at preset reference points.
[0041] Since the calibration of the radar level gauge 1 requires calibration at least 5 to 10 points, in order to meet the distance measurement needs under different distance conditions such as short distance or long distance, the number of reflectors 2 in this invention is set to be greater than or equal to the number of preset reference points. This allows for the selection of the same number of reflectors 2 as the number of preset reference points at different measurement distances.
[0042] For example, when the measurement distance is 25m, five reflectors 2 can be set at distances of 5m, 10m, 15m, 20m, and 25m respectively, and these five reflectors 2 correspond exactly to the positions of five preset reference points. When the measurement distance is 15m, five reflectors 2 can be set at distances of 3m, 6m, 9m, 12m, and 15m respectively, and the preset reference point position corresponding to the 15m distance can be selected using the reflector 2 at the measurement distance of 25m. When the measurement distance is 50m, six reflectors 2 can be set at distances of 5m, 10m, 20m, 30m, 40m, and 50m respectively, and the preset reference point positions corresponding to the 5m, 10m, and 20m distances can be selected using the reflector 2 at the measurement distance of 25m.
[0043] In this utility model, a set of reflectors 2 with the same structure is set up. There are multiple reflectors 2 with the same structure. During the calibration process of the radar level gauge 1, the number and spacing of the multiple reflectors 2 can be selected according to the number of preset reference points and the distance of measurement.
[0044] For example, when performing long-distance measurements, a large number of reflectors 2 can be set up. When performing short-distance measurements later, a portion of the reflectors 2 can be selected for distance measurement. The position of this portion of the reflectors 2 corresponds to the position of the current preset reference point.
[0045] To ensure the accuracy of distance measurements and avoid distance measurement errors caused by moving the reflector 2 during the measurement process, this utility model provides multiple reflectors 2, which are arranged in parallel and perpendicular to the direction of the radar waves emitted by the radar level gauge 1.
[0046] This invention includes multiple reflectors 2. During the calibration of the radar level gauge 1, the radar level gauge 1 sequentially emits radar waves to multiple reflectors 2 at multiple preset reference points, preferably in the calibration order. During the calibration of the radar level gauge 1, one of the reflectors 2 is in the working calibration position, while the others are in non-working calibration positions. The reflectors 2 in the working calibration position are perpendicular to the direction of the radar waves emitted by the radar level gauge 1, serving to receive and reflect the radar waves; the reflectors 2 in the non-working calibration positions are parallel or nearly parallel to the direction of the radar waves emitted by the radar level gauge 1, and do not receive or reflect radar waves at this position.
[0047] Taking a radar level gauge 1 with five reflectors 2 arranged sequentially from closest to furthest away as an example, the five reflectors 2 are numbered 1, 2, 3, 4, and 5. The five reflectors 2 numbered 1 to 5 are set at five preset reference points. During the calibration process, the radar level gauge 1 first emits radar waves to the reflector 2 numbered 1. At this time, the reflector 2 numbered 1 is located at the working calibration position, while the other reflectors 2 numbered 2 to 5 are located at non-working calibration positions. After the radar level gauge 1 receives the reflected wave reflected by the reflector 2 numbered 1, the reflector 2 numbered 1 is rotated to the non-working calibration position by the drive motor, while the reflector 2 numbered 2 is rotated to the working calibration position. At this time, the reflectors 2 numbered 3 to 5 remain in the non-working calibration positions. This process is repeated sequentially until the radar level gauge 1 receives the reflected wave reflected by the reflector 2 numbered 5. At this time, the radar level gauge 1 will receive 5 distance measurement values. The radar level gauge 1 will be calibrated by analyzing and comparing these 5 distance measurement values with 5 preset distance standard values.
[0048] This invention provides a calibration device for a high-precision radar level gauge 1, comprising multiple reflectors 2, all located opposite the radar level gauge 1. These reflectors 2 receive radar waves emitted by the radar level gauge 1 and reflect the radar waves to form reflected waves. The radar level gauge 1 obtains distance measurement values by emitting radar waves to the reflectors 2 and receiving the reflected waves. The multiple reflectors 2 are positioned at preset reference points. By setting multiple reflectors 2 at multiple preset reference points, this invention eliminates the need to move the reflectors 2 during distance measurement. Furthermore, each reflector 2 can rotate to a working calibration position during distance measurement and to a non-working calibration position during non-distance measurement, thereby significantly reducing measurement errors.
[0049] like Figure 1-3As shown, during the calibration of radar level gauge 1, radar level gauge 1 needs to be placed on mounting platform 3. In order for the radar waves emitted by radar level gauge 1 to be received and reflected by reflector plate 2, reflector plate 2 is correspondingly placed on fixed bracket 4. The reflector plate 2 is rotated on fixed bracket 4 to the working calibration position or non-working calibration position via rotating shaft 6.
[0050] The rotation of the reflector 2 to the working calibration position or the non-working calibration position can be achieved manually or by the drive component 8. A limiting part 7 can be fixedly installed on the fixed bracket 4, and the reflector 2 is rotated to the limiting part 7 to switch from the non-working calibration position to the working calibration position. Since the stability of the reflector 2's position needs to be ensured during distance measurement, and to overcome the distance error caused by moving the reflector 2 to multiple preset reference points in the prior art, the limiting part 7 is used to mechanically limit the working calibration position. This ensures that the reflector 2 can only move within a limited range. Compared to the prior art technique of moving one reflector 2 to multiple preset reference points for distance measurement, this invention uses multiple parallel reflectors 2 at preset reference points, with the positions pre-calibrated by the system. During the measurement process, the reflectors 2 are not moved; distance measurement is achieved only by rotating the reflectors 2 at multiple preset reference points.
[0051] The aforementioned limiting part 7 is mainly used to limit the rotation of the reflector 2 from the non-working calibration position to the working calibration position. The rotation from the non-working calibration position to the working calibration position can also be achieved by the limiting part, or by controlling the rotation angle through the control module. The limiting part needs to be hidden in the space area enclosed by the first bracket 41 and the second bracket 42, so that it will not receive radar waves and will not affect the distance measurement during the calibration process.
[0052] It should be noted that the aforementioned limiting part 7 can also be a limiting electronic switch, i.e., an electronic switch assembly, or the limiting part 7 can be combined with a limiting electronic assembly to achieve the limiting function. For example, the electronic switch assembly can be a photoelectric switch assembly, a capacitive proximity switch, an inductive proximity switch, etc.
[0053] To achieve intelligent rotation of the reflector 2, the reflector 2 can be rotated by a drive component 8, preferably a drive motor.
[0054] Specifically, such as Figure 2 and 4As shown, the fixed bracket 4 includes a first bracket 41 and a second bracket 42, which form an angle. The first bracket 41 or the second bracket 42 also forms an angle with the reflector 2. A fixed support plate 5 is provided on the fixed bracket 4. The limiting part 7, the driving component 8, and the rotating shaft 6 are fixedly mounted on the fixed support plate 5. Simultaneously, the fixed support plate 5, the limiting part 7, the driving component 8, and the rotating shaft 6 are concealed within the space enclosed by the first bracket 41 and the second bracket 42.
[0055] like Figure 5 As shown, the first bracket 41 and the second bracket 42 are vertically arranged, and the fixed support plate 5 is horizontally arranged in the included space area formed by the first bracket 41 and the second bracket 42. The fixed support plate 5 is provided with a rotating shaft 6 for driving the reflector 2 to rotate, a drive motor, and a limiting part 7.
[0056] To prevent the radar level gauge 1 from receiving reflected waves from other objects after the radar waves emitted towards the reflector plate 2 are reflected, it is preferable that the first bracket 41 and the second bracket 42 are arranged perpendicularly and adjacently, with the angle between the first bracket 41 or the second bracket 42 and the reflector plate 2 being 45°. During distance measurement, the reflector plate 2 is rotated to a position at 45° to the first bracket 41 or the second bracket 42. This position is perpendicular to the direction of the radar waves emitted by the radar level gauge 1. From this position, looking from the direction of the radar waves emitted by the radar level gauge 1, only the first bracket 41, the second bracket 42, and the reflector plate 2 are visible; other components (fixed support plate 5, drive motor, or rotating shaft 6) are not visible.
[0057] In this invention, the first bracket 41 and the second bracket 42 are arranged perpendicularly and adjacently, and the angle between the first bracket 41 or the second bracket 42 and the reflector 2 is 45°. After the radar level gauge 1 emits radar waves perpendicularly towards the reflector 2, it will only receive the reflected waves reflected by the reflector 2. If the first bracket 41 or the second bracket 42 receives a portion of the radar waves, it will reflect a reflected wave parallel to the reflector 2. This reflected wave parallel to the reflector 2 is perpendicular to the reflected wave perpendicular to the reflector 2. Therefore, the radar level gauge 1 will not receive the reflected wave reflected by the first bracket 41 or the second bracket 42, thereby making the distance measurement more accurate.
[0058] When placing the reflector 2 at the preset reference point, position calibration is required. During calibration, the height of the reflector 2 may need to be adjusted. For this purpose, a mounting base 9 can be provided at the bottom of the fixed bracket 4. The mounting base 9 is connected to the fixed bracket 4, and the height of the fixed bracket 4 can be adjusted through the threaded assembly 91 on the mounting base 9.
[0059] like Figure 1 , 2 As shown in Figure 4, threaded components 91 can be provided around or on the side of the mounting base 9. The threaded components 91 are fixedly mounted on the support feet 92. The support feet 92 and the mounting base 9 are movably connected through the threaded components 91 to adjust the height of the fixed bracket 4.
[0060] The calibration method using the calibration device for a high-precision radar level gauge disclosed above includes the following steps:
[0061] Radar level gauge 1 emits radar waves;
[0062] The radar waves are reflected by the reflector 2 set at each preset reference point position;
[0063] The radar level gauge 1 receives reflected waves reflected by the reflector 2 at multiple preset reference points to obtain multiple distance measurement values at the multiple preset reference points.
[0064] The radar level gauge 1 is calibrated by using multiple distance measurements and multiple preset distance standard values.
[0065] This invention sets multiple reflectors 2 at multiple preset reference points, so that the reflectors 2 do not need to be moved during distance measurement. Each reflector 2 can be rotated to the working calibration position during measurement and to the non-working calibration position when not measuring distance, thereby greatly reducing measurement error.
[0066] During the calibration of radar level gauge 1, radar level gauge 1 needs to be placed on mounting platform 3. In order for the radar waves emitted by radar level gauge 1 to be received and reflected by reflector plate 2, reflector plate 2 is correspondingly placed on fixed bracket 4. The reflector plate 2 is rotated on fixed bracket 4 to the working calibration position or non-working calibration position via rotating shaft 6.
[0067] The radar level gauge 1 receives reflected waves from the reflector 2 at multiple preset reference points to obtain multiple distance measurement values at those points, including the following steps:
[0068] Multiple reflectors 2 are arranged in a calibration order at corresponding preset reference point positions;
[0069] Control the multiple reflectors 2 to rotate sequentially to the working calibration position according to the calibration order;
[0070] The radar level gauge 1 acquires and records multiple distance measurement values.
[0071] It should be noted that in this utility model, the control device can control the drive motor to rotate the reflector 2 to the working calibration position in sequence. After the reflected wave reflected by the current reflector 2 is received by the radar level gauge 1, the control device receives the reflected wave signal and controls the drive motor to rotate the current reflector 2 to the non-working calibration position. At the same time, the adjacent reflector 2 is rotated to the working calibration position. The reflected wave signals at all preset reference point positions are obtained in this way.
[0072] Because the calibration process of radar level gauge 1 requires calibration at least 5 to 10 points, the following example uses five reflectors 2 numbered 1-5 and five preset reference points. The control device can simultaneously communicate with radar level gauge 1 and the drive unit, controlling radar level gauge 1 to receive the reflected wave signals from reflectors 2 in sequence. For example, it can rotate the corresponding reflectors 2 to the working calibration position in the order of number 1, 2, 3, 4, 5, 5, 4, 3, 2, 1 for distance measurement. Alternatively, it can rotate the corresponding reflectors 2 to the working calibration position in the order of number 1, 2, 3, 4, 5, 5, etc. for distance measurement.
[0073] To ensure more accurate distance measurements, at least two distance measurements should be obtained at each preset reference point, preferably five distance measurements at each preset reference point. These measurements are then compared with preset distance standard values to calibrate the radar level gauge 1.
[0074] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.
[0076] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.
Claims
1. A calibration device for a high-precision radar level gauge, characterized in that, It includes multiple reflectors, all of which are located on the opposite side of the radar level gauge, for receiving radar waves emitted by the radar level gauge and reflecting the radar waves to form reflected waves; The radar level gauge obtains distance measurement values by emitting radar waves to the reflector and receiving the reflected waves reflected by the reflector. Multiple reflectors are set at multiple preset reference point positions, and the number of reflectors is greater than or equal to the number of preset reference point positions.
2. The calibration device for a high-precision radar level gauge according to claim 1, characterized in that, The plurality of reflectors are arranged in parallel, and the plurality of reflectors are perpendicular to the direction of the radar waves emitted by the radar level gauge.
3. The calibration device for a high-precision radar level gauge according to claim 1, characterized in that, When the radar level gauge is calibrated, one of the reflectors is in the working calibration position, while the other reflectors are in the non-working calibration position.
4. The calibration device for a high-precision radar level gauge according to claim 3, characterized in that, The reflector is mounted on a fixed bracket, and the reflector can be rotated on the fixed bracket to the working calibration position or the non-working calibration position via a rotating shaft; The rotation of the reflector to the working calibration position or the non-working calibration position is achieved manually or by a drive component.
5. The calibration device for a high-precision radar level gauge according to claim 4, characterized in that, It also includes a limiting part, which is fixedly mounted on the fixed bracket and is used to limit the rotation of the reflector to the working calibration position.
6. The calibration device for a high-precision radar level gauge according to claim 5, characterized in that, A fixed support plate is provided on the fixed bracket, and the limiting part, the driving component and the rotating shaft are fixedly mounted on the fixed support plate.
7. The calibration device for a high-precision radar level gauge according to claim 6, characterized in that, The fixed bracket includes a first bracket and a second bracket, the first bracket and the second bracket forming an angle, and the first bracket or the second bracket having an angle with the reflector.
8. The calibration device for a high-precision radar level gauge according to claim 7, characterized in that, The first bracket and the second bracket are arranged perpendicularly and adjacent to each other; the angle between the first bracket or the second bracket and the reflector is 45°.
9. A calibration device for a high-precision radar level gauge according to claim 7, characterized in that, The fixed support plate, the limiting part, the driving component, and the rotating shaft are arranged in the space area enclosed by the first bracket and the second bracket.
10. A calibration device for a high-precision radar level gauge according to claim 7, characterized in that, The bottom of the fixed bracket is provided with a mounting base.
11. The calibration device for a high-precision radar level gauge according to claim 10, characterized in that, The mounting base is connected to the fixed bracket, and the position of the fixed bracket can be adjusted by the mounting base.