Radar liquid level meter calibrating device with adjustable pitch angle of laser interferometer

Abstract

The utility model provides a radar liquid level meter calibrating device with an adjustable pitch angle of a laser interferometer, and belongs to the technical field of radar liquid level meter calibrating equipment. According to the device, the laser interferometer and the reflecting plate are arranged at the two ends of the displacement track, the radar liquid level meter is arranged between the laser interferometer and the reflecting plate and slides on the displacement track along with the displacement table, and meanwhile the pitching angle of the laser interferometer is adjustable, so that the problem that a calibration device corresponding to a calibration method of the radar liquid level meter in the prior art is low in efficiency is solved. The calibrating device comprises a displacement track serving as a horizontal reference surface, a laser interferometer assembly installed at the left end of the displacement track, a reflecting plate assembly installed at the right end of the displacement track, a displacement table sliding along the displacement track and a power assembly driving the displacement table to slide on the displacement track. The radar liquid level meter and the reflecting mirror set are both installed on the displacement table, the radar liquid level meter is opposite to the reflecting plate assembly, the reflecting mirror set is opposite to the interference mirror set, and the laser interferometer can adjust the pitching angle.

Description

Technical Field

[0001] This utility model belongs to the technical field of radar level gauge calibration equipment, and in particular relates to a radar level gauge calibration device with adjustable pitch angle of laser interferometer. Background Technology

[0002] Radar level gauges are one of the commonly used automatic measuring instruments in military base oil depots for measuring the level of oil in tanks. They are level measuring instruments that use microwave technology and have an accuracy of up to 1 mm. They have advantages such as safety and reliability, high precision, no blind zone, non-contact measurement, long life and being almost unaffected by changes in the physical properties of the measured medium.

[0003] To ensure that radar level gauges meet metrological verification requirements and that the measured data is valid and reliable, the radar level gauges used should be verified annually according to the verification procedure JJG 971-2019. Currently, there are two main verification methods for radar level gauges both within and outside the military: one is to verify the level gauge using a manual measuring instrument; the other is to verify it using a highly accurate length standard device, i.e., the comparison method. Both methods require manual measurement of the medium level in the container. This measurement is used as the standard value of the level, and the radar level gauge measurement is used as the test value. By comparing the error between the standard value and the test value, it is determined whether the radar level gauge meets the metrological performance requirements of the metrological verification procedure.

[0004] The annual calibration tasks of the metrology and verification departments of various military branches are extremely heavy. Using the aforementioned calibration methods, the current force assessment cycle is too long to meet the troop calibration cycle requirements. Furthermore, when using the comparative method to calibrate radar level gauges, to ensure the calibration accuracy, the elevation angle of the standard instrument (e.g., a laser interferometer) needs to be adjusted in real time according to the elevation axis of the radar level gauge. Therefore, it is essential to develop a highly automated radar level gauge calibration device, and this device should be able to quickly and timely adjust the elevation angle of the standard instrument according to the elevation axis of the radar level gauge. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a calibration device, calibration system and calibration method for a transverse radar level gauge, in order to solve the problem that the calibration method of radar level gauge in the prior art is inefficient and cannot meet the cycle requirements of the troops' calibration in the face of the heavy calibration tasks of the metrology and calibration departments of various military branches every year.

[0006] To achieve the above and other related objectives, this utility model provides a radar level gauge calibration device with adjustable pitch angle for laser interferometers, comprising:

[0007] The displacement trajectory serves as a horizontal reference plane.

[0008] The laser interferometer assembly includes a laser interferometer, an interferometer mirror group, and a reflector mirror group. The laser interferometer is mounted at the left end of the displacement track. The interferometer mirror group remains relatively stationary with respect to the laser interferometer. The laser interferometer is capable of adjusting its pitch angle.

[0009] A reflector assembly is installed at the right end of the displacement track;

[0010] A displacement stage is installed between the laser interferometer and the reflector assembly, and slides along the displacement track;

[0011] The power unit drives the displacement stage to slide on the displacement track;

[0012] Both the radar level gauge and the reflector assembly are mounted on the displacement stage and slide on the displacement track as the displacement stage moves. The radar level gauge and the reflector assembly are opposite each other, and the reflector assembly and the interferometer assembly are opposite each other.

[0013] Optionally, the laser interferometer assembly further includes a left positioning seat, a magnetic base, a first magnetic block, and a second magnetic block; the left positioning seat is fixedly installed at the left end of the displacement track, the magnetic base is fixedly installed on the left positioning seat, the top of the magnetic base is provided with a first magnetic block, and the bottom of the laser interferometer is provided with a second magnetic block; the laser interferometer is installed on the magnetic base through the cooperation of the first magnetic block and the second magnetic block; the interferometer mirror assembly is fixedly installed on the left positioning seat.

[0014] Optionally, the laser interferometer has two symmetrical second magnetic blocks at its bottom front end and a second magnetic block at its rear end along the center line, with the bottom of the second magnetic blocks being hemispherical. The magnetic base has two first magnetic blocks at its front end and a pitch seat at its rear end, corresponding to the position of the second magnetic block at the rear end of the laser interferometer. The pitch seat has a groove in the middle of its upper part. The magnetic base has a horizontal groove at its rear end, in which a knob seat is fixedly installed. The pitch seat is slidably mounted on the knob seat, and a knob pushes the pitch seat to slide by screwing into the knob seat.

[0015] Optionally, the displacement track is a double linear guide rail, composed of multiple granite guide rail segments, the granite guide rail segments having a convex structure; the displacement platform is made of granite and has an inverted concave structure, forming an air-bearing guide rail structure with the guide rail segments.

[0016] Optionally, the bottom of the guide rail section is placed on a horizontal surface by a support base, and a side adjustment plate is provided on the side of the support base. The lower part of the side adjustment plate is detachably installed on the side of the support base, and the top of the side adjustment plate abuts against the bottom of the guide rail section.

[0017] Optionally, the reflector assembly includes a reflector and a right fixed base; the right fixed base is fixedly installed at the right end of the displacement track, and the reflector is fixedly installed on the right fixed base by insertion.

[0018] Optionally, the reflector is made of carbon fiber composite material and is circular in shape with a diameter of 1000 mm.

[0019] Optionally, a lifting seat is installed on the displacement platform, and the radar level gauge is fixedly installed on the lifting seat.

[0020] As described above, the calibration device for a transverse radar level gauge of this invention has at least the following beneficial effects:

[0021] This adjustable-angle laser interferometer radar level gauge calibration device utilizes a design with laser interferometers and reflector assemblies at both ends of a displacement track, and a radar level gauge sliding along the track with the displacement stage. After the displacement stage moves a certain distance, the laser interferometer emits a beam of light, which passes through the interferometer mirror assembly, reaches the transmitting mirror assembly, and then returns to the interferometer mirror assembly, thus measuring the distance the displacement stage has moved. Similarly, the radar level gauge emits microwaves to the reflector assembly, which then return to the radar level gauge, measuring the distance the displacement stage has moved. By comparing the radar level gauge measurements... The calibration device uses the measured values ​​of the laser interferometer and the measured values ​​of the laser interferometer to complete the calibration of the radar level gauge. Compared with the devices used in the existing manual measurement method, water tank method, and water tower method, as well as other devices used in the comparison method, this calibration device has a simple overall structure and only requires one person in the laboratory to complete the calibration of the radar level gauge. It requires fewer personnel, has a high degree of automation, and effectively shortens the calibration cycle of the radar level gauge. At the same time, through the adjustable pitch angle design of the laser interferometer, it can adapt to the pitch axis of the radar level gauge, thereby improving the calibration accuracy of this calibration device. Attached Figure Description

[0022] Figure 1 The diagram shown is a verification device for a horizontal radar level gauge according to this utility model.

[0023] Figure 2 This is a schematic diagram illustrating the principle of manual measurement in existing technology.

[0024] Figure 3 The diagram shown is a schematic of the laser interferometer assembly of this utility model.

[0025] Figure 4 The diagram shown is a schematic of the magnetic base of this utility model.

[0026] Figure 5 The diagram shown is a schematic of the displacement stage of this utility model.

[0027] Figure 6 The image shown is a front view of the lifting seat of this utility model.

[0028] Component designation explanation

[0029] Displacement track 1, guide rail section 11, support base 12, side adjustment plate 13;

[0030] Laser interferometer assembly 2, laser interferometer 21, interferometer mirror group 22, reflector mirror group 23, left positioning seat 24, magnetic base 25, transverse groove 251, first magnetic block 261, second magnetic block 262, knob seat 27, knob 28, pitch seat 29.

[0031] Reflector assembly 3, reflector 31, right fixing seat 32;

[0032] 4. Displacement stage; 5. Radar level gauge; 6. Lifting platform;

[0033] Clamping seat 7, lower clamping block 71, upper clamping block 72, clamping rod 73, clamping bolt 74. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0035] Please see Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0036] Before introducing the specific embodiments of this utility model, we will further introduce the background of the calibration device, calibration system and calibration method of this transverse radar level gauge.

[0037] Radar level gauges are general-purpose radar level gauges. They are measuring instruments based on the time-of-flight principle. Radar waves travel at the speed of light, and the travel time can be converted into a level signal by electronic components. The probe emits high-frequency pulses that propagate through space at the speed of light. When the pulses encounter the material surface, they are reflected back and received by the receiver inside the instrument, which converts the distance signal into a level signal.

[0038] Currently, the main calibration methods for liquid level gauges at home and abroad include manual measurement, water tank method, comparison method, and water tower method.

[0039] The manual measurement method uses a standard steel tape measure to manually measure the liquid level in a container, using this measurement as the standard value. The level gauge reading is then used as the test value. By comparing the error between the standard and test values, it is determined whether the level gauge meets the metrological performance requirements of the calibration procedure. This method allows for online calibration, saving calibration time and not interfering with the normal use of the level gauge. However, because the standard instrument used in this method is a standard steel tape measure, its accuracy is not high, limiting the scope of application of this method. A schematic diagram of the method is shown below. Figure 2 As shown.

[0040] The water tank method involves equipment consisting of a water tank, a pressure-type water tank calibration device for level gauges, and a digital pressure calibrator. Level gauges are calibrated in a laboratory setting by simulating a liquid tank with a water tank equipped with a level indicator. The standard equipment used in the water tank method has high accuracy, resulting in high accuracy of the calibration results. This method also allows for a wide range of level gauges to be tested. The water tank method is suitable for calibrating various level gauges, offering high reading accuracy and relatively simple operation. However, the calibration equipment for the water tank method is bulky and requires significant hydraulic and electrical power for calibration, leading to substantial resource consumption in actual operation.

[0041] The water tower method is essentially the same as the water tank method for calibrating level gauges. Compared to the water tank method, the water tower method has a wider calibration range and is suitable for level gauges with a broader measurement range. The maximum calibration range of the water tower method depends on the height of the water tower; the higher the water tower, the larger the range of the level gauge that can be calibrated. The water tower method can calibrate full-scale level gauges. However, this method requires a long calibration time, is very labor-intensive, and requires a large amount of water, resulting in significant water waste. Furthermore, wastewater discharge after calibration is difficult.

[0042] The comparative method uses a high-accuracy length measuring instrument as a standard to verify and calibrate a lower-grade level gauge. The standard and the instrument under test are measured for the same length. The standard's measurement data is used as the true value, and the instrument under test's measurement data is used as the measured value. The error of the instrument under test is examined to determine whether it meets the requirements of the metrological verification procedure. Currently, the standard instruments used in this method mainly include a series of high-precision instruments such as laser interferometers, optical encoders, and magnetic encoders. This method is widely used.

[0043] Currently, there are two main methods for testing radar level gauges in China. One method is to use manual gauging to calibrate the level gauge, and the other method is to use a highly accurate length standard device to calibrate the radar level gauge under test, which is the comparison method.

[0044] After introducing different calibration methods for radar level gauges, we will specifically introduce the calibration device, calibration system and calibration method of this utility model through different embodiments.

[0045] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0046] Please see Figure 1 This utility model provides a calibration device for a radar level gauge, comprising:

[0047] like Figure 1 The displacement trajectory 1 shown is used as the horizontal reference plane;

[0048] like Figure 1 and Figure 2 The laser interferometer assembly 2 shown includes a laser interferometer 21, an interferometer mirror group 22, and a reflecting mirror group 23. The laser interferometer 21 is mounted at the left end of the displacement track 1, and the interferometer mirror group 22 remains relatively stationary with respect to the laser interferometer 21. The laser interferometer 21 is based on the phenomenon of light interference, splitting the laser beam into two beams. One beam serves as a reference beam, while the other beam, after illuminating the object under test, is reflected back to form the measurement beam. When the object under test undergoes displacement, the optical path of the measurement beam changes, producing interference fringes with the reference beam. By detecting the changes in the interference fringes, minute displacements, angular changes, and other physical quantities of the object under test can be accurately measured.

[0049] like Figure 1 The reflector assembly 3 shown is installed at the right end of the displacement track 1;

[0050] like Figure 1 and Figure 5 The displacement stage 4 shown is installed between the laser interferometer 21 and the reflector assembly 3, and slides along the displacement track 1;

[0051] The power component drives the displacement stage 4 to slide on the displacement track 1. The power component can be composed of a servo motor system and a drag chain mechanism, or a servo motor system and a pulley. The specific structure of the power component will not be described in detail here.

[0052] like Figure 1 , Figure 3 and Figure 5 As shown, the radar level gauge 5 and the reflector assembly 23 are both mounted on the displacement stage 4 and slide along the displacement track 1 as the displacement stage 4 moves. The radar level gauge 5 and the reflector assembly 3 are opposite each other, and the reflector assembly 23 and the interferometer assembly 22 are opposite each other. That is, the calibration device for this transverse radar level gauge 5 uses the laser interferometer 21 and the reflector assembly 3 at both ends of the displacement track 1, and the structural design of the radar level gauge 5 sliding along the displacement track 1 with the displacement stage 4, so that after the displacement stage 4 moves a certain distance, the laser interferometer 21 emits a beam of light, which passes through the interferometer assembly 22, reaches the transmitting mirror assembly, and then returns to the interferometer assembly 22, thereby measuring the moving distance of the displacement stage 4; the radar level gauge 5 emits microwaves to the reflector assembly 3, and the microwaves are then... The device returns to the radar level gauge 5, thereby measuring the moving distance of the displacement stage 4. By comparing the measured value of the radar level gauge 5 with the measured value of the laser interferometer 21, the calibration of the radar level gauge 5 is completed. Compared with the devices used in the existing manual measurement method, water tank method, and water tower method, as well as other devices used in the comparison method, this calibration device has a simple overall structure and only requires one person in the laboratory to complete the calibration of the radar level gauge 5. It requires fewer personnel, has a high degree of automation, and effectively shortens the calibration cycle of the radar level gauge 5. This solves the problem that the existing calibration methods for the radar level gauge 5 are inefficient and cannot meet the cycle requirements of the military's calibration in the face of the heavy calibration tasks of the metrology and calibration departments of various military branches every year.

[0053] In another implementation, please refer to Figure 1 and Figure 5 The displacement track 1 is a double linear guide rail, composed of multiple granite guide rail segments 11. Specifically, the displacement track 1 is made of three 4-meter-long granite marble pieces. The granite guide rail segment 11 has a convex structure, that is, two working planes, hence the name double linear guide rail, to better ensure accuracy. The displacement stage 4 is also made of granite and has an inverted concave structure. Together with the guide rail segment 11, it forms an air-bearing guide rail structure. It uses compressed air to generate levitation force, so that a non-contact air film gap is formed between the displacement stage 4 and the guide rail, thereby eliminating friction and wear. This not only makes the movement smooth but also increases the accuracy. At the same time, it can realize two movement schemes: remote control automatic operation sliding or manual wireless semi-automatic operation sliding.

[0054] In another implementation, please refer toFigure 1 The bottom of the guide rail section 11 is placed on a horizontal surface via a support base 12. A side adjustment plate 13 is provided on the side of the support base 12. The lower part of the side adjustment plate 13 is detachably installed on the side of the support base 12. The top of the side adjustment plate 13 abuts against the bottom of the guide rail section 11. By installing different adjustment plates, the levelness of the guide rail section 11 can be finely adjusted, thereby ensuring the calibration accuracy of this calibration device.

[0055] In another implementation, please refer to Figure 1 and Figure 3 The laser interferometer assembly 2 also includes a left positioning seat 24, a magnetic base 25, a first magnetic block 261, and a second magnetic block 262.

[0056] like Figure 3 and Figure 4 As shown, the left positioning seat 24 is fixedly installed on the left end of the displacement track 1, and the magnetic base 25 is fixedly installed on the left positioning seat 24. The top of the magnetic base 25 is provided with a first magnetic block 261, and the bottom of the laser interferometer 21 is provided with a second magnetic block 262. The laser interferometer 21 is installed on the magnetic base 25 through the cooperation of the first magnetic block 261 and the second magnetic block 262. The interferometer lens assembly 22 is fixedly installed on the left positioning seat 24. Because the laser interferometer 21 is expensive, this design allows the staff to easily and quickly remove and store the laser interferometer 21 when the calibration device is not being used for calibration, thus facilitating the management of valuable equipment.

[0057] In another implementation, please refer to Figure 1 The reflector assembly 3 includes a reflector 31 and a right fixing seat 32. The right fixing seat 32 is fixedly installed on the right end of the displacement track 1. The reflector 31 is fixedly installed on the right fixing seat 32 by insertion. After the reflector 31 is vertically inserted into the right fixing seat 32, a threaded hole can be opened on the right fixing seat 32, and then the reflector 31 and the right fixing seat 32 can be fixed horizontally to ensure the installation of the reflector 31 firmly.

[0058] In another implementation, please refer to Figure 1 The reflector 31 is made of carbon fiber composite material. This material uses high-quality carbon fiber raw materials and good base resin. The carbon fiber sheet has good properties such as high tensile strength, corrosion resistance, shock resistance and impact resistance. Most radar level gauges 5 currently in use have a reflection range within ±50mm. In order to ensure that the reflector 31 can cover the radar wave range of the radar level gauge 5 and avoid echo attenuation and false signals from other obstacles, the reflector 31 in this project is designed as a circle with a diameter of 1000mm.

[0059] In another implementation, please refer toFigure 5 and Figure 6 The displacement stage 4 is equipped with a lifting seat 6, and the radar level gauge 5 is fixedly installed on the lifting seat 6, so as to ensure that different radar level gauges 5 can be aligned with the center of the reflector 31, and to ensure that the transmitting plate can cover the radar wave range of the radar level gauge 5; the lifting seat 6 can be a hand-cranked scissor type lifting seat 6 as shown in the figure, or it can be an electric hydraulic telescopic cylinder to realize the lifting function.

[0060] In another implementation, please refer to Figure 3 and Figure 4 The laser interferometer 21 can be pitch adjusted. Specifically, two symmetrical second magnetic blocks 262 are set at the front bottom of the laser interferometer 21, and one second magnetic block 262 is set at the center line at the rear end of the laser interferometer 21. The three second magnetic blocks 262 are arranged in this way to ensure the stability of the laser interferometer 21. The bottom of the second magnetic blocks 262 is hemispherical. Two first magnetic blocks 261 are set at the front end of the magnetic base 25 to correspond to the two symmetrical second magnetic blocks 262 at the front bottom of the laser interferometer 21. However, at the rear end of the magnetic base 25, where the second magnetic blocks 262 are set at the rear end of the laser interferometer 21, no first magnetic blocks 261 are installed, but a pitch seat 29 is installed instead.

[0061] like Figure 4 As shown, the rear end of the magnetic base 25 has a horizontal groove 251, in which a knob seat 27 is fixedly installed. The tilt seat 29 is slidably mounted on the knob seat 27. A knob 28 pushes the tilt seat 29 to slide on the knob seat 27 by screwing it into the knob seat 27. Figure 4 As shown, a groove is provided in the middle of the upper part of the pitch mount 29. This groove can be as follows: Figure 4 The trapezoidal shape shown can also be U-shaped. The operator drives the sliding of the pitch seat 29 by rotating the knob 28, so that the second magnetic block 262 is located in the groove of the pitch seat 29 or on the upper surface of the pitch seat 29, thereby realizing the pitch adjustment of the laser interferometer 21. At the same time, because the bottom of the second magnetic block 262 is hemispherical, it also ensures that the entire laser interferometer 21 remains stable after the pitch adjustment. By adjusting the pitch angle of the laser interferometer 21, its laser beam path is aligned with the pitch axis of the radar level gauge 5, thereby further improving the calibration accuracy of this calibration device. At the same time, this structure is also very convenient for the operator to adjust the pitch angle of the laser interferometer.

[0062] In another implementation, please refer to Figure 5The lifting seat 6 is also equipped with a clamping seat 7, which includes a lower clamping block 71 and an upper clamping block 72. The lower clamping block 71 is fixedly installed on the lifting seat 6, and clamping rods 73 are fixedly installed on both sides of the upper end of the lower clamping block 71. Clamping holes are opened on both sides of the upper clamping block 72. The two clamping holes cooperate with the two clamping rods 73 respectively, thereby connecting the upper clamping block 72 to the lower clamping block 71. The opposing surfaces of the lower clamping block 71 and the upper clamping block 72 are both arc-shaped. The upper clamping block 72 and the lower clamping block 71 clamp the radar level gauge 5, and the clamping bolt 74 is screwed into the top of the clamping rod 73 until it abuts against the top of the upper clamping block 72, thereby locking the radar level gauge 5. Through the above structural design, the clamping reliability of different radar level gauges 5 can be ensured by adjusting the shape of the upper clamping block 72 or the shape of the rubber sleeve, as well as the fine adjustment of the radar level gauge 5 in the pitch direction and the left and right direction.

[0063] In other implementations, such as Figure 3 and Figure 5 As shown, the left positioning seat 24 has multiple equally spaced threaded holes; the magnetic base 25 is screwed into the threaded holes and fixedly installed on the left positioning seat 24; the displacement stage 4 has multiple equally spaced threaded holes; the lifting seat 6 is screwed into the threaded holes and fixedly installed on the displacement stage 4; this increases the installation flexibility of the magnetic base 25 and the lifting seat 6, allowing operators to adjust the positions of the magnetic base 25 and the lifting seat 6 as needed. After adjustment, screwing the bolts into different threaded holes will achieve the purpose of fixing.

[0064] In summary, the calibration device of this invention, through the structural design of the laser interferometer 21 and reflector assembly 3 at both ends of the displacement track 1, and the radar level gauge 5 sliding on the displacement track 1 with the displacement stage 4, reduces the number of calibration personnel required, achieves a high degree of automation, and effectively shortens the calibration cycle of the radar level gauge 5. The calibration system of this invention, based on the calibration device for the radar level gauge 5, further collects and calculates the recorded parameters through a data processing and analysis module, compares the parameters measured by the laser interferometer 21 with those measured by the radar level gauge 5, and determines the calibration result of the radar level gauge 5. The certificate generation module generates a corresponding certificate based on the determination result of the data processing and analysis module, further reducing calibration time and shortening the calibration cycle of the radar level gauge 5. The calibration method of this invention, through the step design of the aforementioned calibration device and calibration system, solves the problem that the existing calibration methods for the radar level gauge 5 are inefficient and cannot meet the cycle requirements of the military's calibration work due to the heavy annual calibration tasks of various military metrology departments. Therefore, this utility model effectively overcomes the shortcomings of the prior art and has high industrial application value.

[0065] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A radar level gauge calibration device with adjustable pitch angle for laser interferometers, characterized in that, include: The displacement track serves as a horizontal reference plane. The laser interferometer assembly includes a laser interferometer, an interferometer mirror group, and a reflector mirror group. The laser interferometer is mounted at the left end of the displacement track. The interferometer mirror group remains relatively stationary with respect to the laser interferometer. The laser interferometer is capable of adjusting its pitch angle. A reflector assembly is installed at the right end of the displacement track; A displacement stage is installed between the laser interferometer and the reflector assembly, and slides along the displacement track; The power unit drives the displacement stage to slide on the displacement track; Both the radar level gauge and the reflector assembly are mounted on the displacement stage and slide on the displacement track as the displacement stage moves. The radar level gauge and the reflector assembly are opposite each other, and the reflector assembly and the interferometer assembly are opposite each other.

2. The radar level gauge calibration device with adjustable pitch angle for laser interferometer as described in claim 1, characterized in that: The laser interferometer assembly also includes a left positioning base, a magnetic base, a first magnetic block, and a second magnetic block; The left positioning seat is fixedly installed at the left end of the displacement track, the magnetic base is fixedly installed on the left positioning seat, the top of the magnetic base is provided with a first magnetic block, and the bottom of the laser interferometer is provided with a second magnetic block. The laser interferometer is mounted on the magnetic base by the cooperation of the first magnetic block and the second magnetic block; The interference mirror assembly is fixedly mounted on the left positioning seat.

3. The radar level gauge calibration device with adjustable pitch angle for laser interferometer as described in claim 2, characterized in that: The laser interferometer has two symmetrical second magnetic blocks at the bottom front end and a second magnetic block at the rear end on the center line. The bottom of the second magnetic blocks is hemispherical. The front end of the magnetic base is provided with two first magnetic blocks, and the rear end is equipped with a pitch seat at the position corresponding to the second magnetic block at the rear end of the laser interferometer. The upper middle part of the pitch seat is provided with a groove. The magnetic base has a horizontal groove at its rear end, and a knob seat is fixedly installed in the horizontal groove. The pitch seat is slidably installed on the knob seat, and a knob pushes the pitch seat to slide by screwing into the knob seat.

4. The radar level gauge calibration device with adjustable pitch angle for laser interferometer as described in claim 1, characterized in that: The displacement track is a double linear guide rail, which is composed of multiple granite guide rail segments, and the granite guide rail segments have a convex structure. The displacement platform is made of granite and has an inverted concave structure, forming an air-floating guide rail structure with the guide rail section.

5. The radar level gauge calibration device with adjustable pitch angle for laser interferometer as described in claim 4, characterized in that: The bottom of the guide rail section is placed on a horizontal surface by a support base. A side adjustment plate is provided on the side of the support base. The lower part of the side adjustment plate is detachably installed on the side of the support base. The top of the side adjustment plate abuts against the bottom of the guide rail section.

6. The radar level gauge calibration device with adjustable pitch angle for laser interferometer according to claim 1, characterized in that: The reflector assembly includes a reflector and a right mounting base; The right fixed base is fixedly installed at the right end of the displacement track, and the reflector is fixedly installed on the right fixed base by means of insertion.

7. The radar level gauge calibration device with adjustable pitch angle for laser interferometer according to claim 1, characterized in that: The reflector is made of carbon fiber composite material and is circular in shape with a diameter of 1000 mm.

8. The radar level gauge calibration device with adjustable pitch angle for laser interferometer according to claim 1, characterized in that: A lifting seat is installed on the displacement platform, and the radar level gauge is fixedly installed on the lifting seat.

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