Radar level meter capable of reducing electromagnetic wave loss

Abstract

The invention relates to the technical field of industrial process measurement, in particular to a radar level meter capable of reducing electromagnetic wave loss, which comprises a shell, a radar electronic module, an antenna assembly, a middle body and an angle adjusting mechanism. The shell comprises a sealed main cavity, and the radar electronic module is accommodated in the main cavity; the intermediate is arranged between the main cavity and the antenna assembly and is provided with low-reflection glass to form a sealed window; and the angle adjusting mechanism is arranged on the middle body and is connected with the low-reflection glass. According to the invention, the radar electronic module detects the signal intensity of reflection echoes in real time, and controls the angle adjusting mechanism to dynamically adjust the inclination angle of the low-reflection glass according to the signal intensity until the signal intensity reaches the maximum value. According to the invention, the loss of electromagnetic waves in a transmission path can be effectively reduced, the measurement performance is remarkably improved, the structural sealing is realized to enhance the reliability, and the explosion-proof design cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of industrial process measurement technology, and in particular to a radar level gauge that reduces electromagnetic wave loss. Background Technology

[0002] Radar level gauges, as a non-contact level measurement instrument, are widely used in petrochemical, chemical, food, pharmaceutical, water treatment, and mining industries due to their advantages such as high accuracy, strong anti-interference ability, and wide applicability. Their basic principle is to transmit high-frequency electromagnetic waves (usually microwaves) through an antenna and receive the echoes reflected from the surface of the material being measured. The height of the material is calculated by measuring the propagation time of the electromagnetic waves in space.

[0003] With technological advancements, radar level gauges operating at higher frequencies (such as 76 GHz and above) are becoming increasingly popular due to their higher measurement accuracy and smaller antenna size. However, existing high-frequency radar level gauges have significant structural design shortcomings. A typical implementation involves the electromagnetic waves emitted by the radar transceiver unit passing through a waveguide, a hollow cavity, and finally being radiated by a lens antenna. This structure suffers from the following drawbacks: First, electromagnetic waves are prone to reflection and scattering losses during propagation through the waveguide, cavity, and multiple media interfaces, leading to signal attenuation and limiting the improvement of measurement distance and signal-to-noise ratio. Second, the presence of a connecting path between the inner side of the antenna lens and the main cavity of the device makes complete mechanical sealing difficult, exposing the internal precision radar electronic modules and circuits to the risks of external salt spray, humidity, or corrosive gases, resulting in long-term reliability issues. Furthermore, due to the incomplete isolation between the internal cavity and the external environment, higher costs must be invested in the design of the explosion-proof structure, material selection, and processing precision to meet stringent explosion-proof certification requirements (such as Ex d).

[0004] Therefore, how to effectively reduce the transmission loss of high-frequency electromagnetic waves in the transmission and reception paths without sacrificing measurement performance, while achieving reliable sealing of key components of the equipment and reducing the complexity and cost of explosion-proof design, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a radar level gauge that reduces electromagnetic wave loss, comprising: Housing, the housing including a sealed main cavity; The radar electronic module, housed within the main cavity, is used to transmit and receive electromagnetic wave signals; The antenna assembly, connected to the main cavity, is used to radiate the electromagnetic wave signal emitted by the radar electronic module to the material under test, and to receive the reflected echo formed by the radiation from the material under test. An intermediate body is disposed on the electromagnetic wave transmission path between the main cavity and the antenna assembly. The intermediate body is provided with low-reflection glass, which constitutes a sealing window of the main cavity. An angle adjustment mechanism is provided on the intermediate body and connected to the low-reflection glass; The radar electronic module is configured to: detect the signal strength of the reflected echo in real time, and generate a control signal based on the detected echo signal strength. The angle adjustment mechanism responds to the control signal to dynamically adjust the tilt angle of the low-reflection glass until the signal strength of the reflected echo reaches its maximum value.

[0006] Preferably, the angle adjustment mechanism includes a micro motor, the output end of which is connected to the low-reflection glass or its mounting structure.

[0007] Preferably, the initial installation angle of the low-reflection glass relative to the horizontal plane is 22° to 26°.

[0008] Preferably, the thickness of the low-reflection glass is 15 mm to 18 mm.

[0009] Preferably, the housing is a dual-cavity housing, comprising a main cavity and a wiring cavity that are isolated from each other, and the main cavity and the wiring cavity are electrically connected through a sealing structure.

[0010] Preferably, the antenna assembly includes a flange antenna and a lens, wherein the flange antenna is connected to the intermediate body.

[0011] Preferably, the intermediate body is connected to the main cavity via a snap ring, and the flange antenna is connected to the intermediate body via a thread.

[0012] Preferably, it also includes a viewing window cover connected to the main cavity, the viewing window cover having a transparent observation window and an externally hinged sun and rain cover.

[0013] Preferably, the radar electronic module operates at a frequency of 76 GHz to 81 GHz.

[0014] Based on the same concept, the present invention also provides a method for reducing electromagnetic wave transmission loss in radar level gauges, comprising the following steps: The radar electronic module emits electromagnetic wave signals to the material under test and receives the reflected echo signals generated by the radiation from the material under test. Real-time detection of reflected echo signal strength; Based on the intensity of the reflected echo signal, control commands are generated; According to the control command, the drive angle adjustment mechanism is activated to dynamically adjust the tilt angle of the low-reflection glass; The above steps are repeated iteratively until the intensity of the reflected echo signal reaches its maximum value.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention comprises an intermediate body, low-reflection glass, an angle adjustment mechanism, and a radar electronic module. The angle adjustment mechanism responds to a control signal generated by the radar electronic module based on the echo signal intensity, dynamically adjusting the tilt angle of the low-reflection glass to optimize electromagnetic wave transmittance. Simultaneously, this low-reflection glass constitutes a permanent sealed window for the main cavity. This minimizes transmission loss of high-frequency electromagnetic waves in the transmission and reception paths and ensures reliable sealing and protection of the core measurement unit.

[0016] This invention introduces closed-loop control based on real-time echo signal strength to dynamically adjust the low-reflection glass to the optimal transmission angle, thereby actively compensating for and minimizing electromagnetic wave reflection loss at key transmission interfaces. This results in stronger effective transmission and echo signals at the same transmission power, significantly improving measurement distance, signal-to-noise ratio, and final measurement accuracy. This invention, by integrating the low-reflection glass into the intermediate body and using it as a fixed sealing window for the main cavity, completely blocks harmful media such as external salt spray, moisture, and corrosive gases from entering the core electronic compartment. It fundamentally solves the sealing problem caused by the connection between the electromagnetic wave path and the main cavity in existing designs, greatly enhancing the long-term operational reliability and stability of the radar level gauge in harsh industrial environments. Because the main cavity of this invention achieves complete isolation from the external hazardous environment through the aforementioned sealed window, its interior is considered an independent sealed safety unit. This design simplifies the stringent design of the overall shell structure required to meet explosion-proof certification requirements, effectively reducing the material costs and processing and assembly complexity of explosion-proof implementation; The invention employs a dual-cavity design with a main cavity and a wiring cavity isolated from each other, integrating the radar electronic module, angle adjustment mechanism, and low-reflection glass within a sealed main cavity. This layout is not only safe and compliant, but also compact in structure, with a clear maintenance interface, facilitating on-site installation, commissioning, and subsequent maintenance. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0018] Figure 1 This is a schematic cross-sectional view of a radar level gauge for reducing electromagnetic wave loss according to the present invention. Figure 2 This is a schematic diagram of the intermediate structure of a radar level gauge for reducing electromagnetic wave loss according to the present invention. Figure 3 This is a flowchart of a method for reducing electromagnetic wave transmission loss in a radar level gauge according to the present invention.

[0019] Figure Labels 1. Sunscreen and rainproof cover; 2. Window cover; 3. Main cavity; 4. Dual cavity shell; 5. Blind cover; 6. Radar electronic module; 7. Wiring cavity; 8. Intermediate body; 9. Flange antenna; 10. Lens; 11. Micro motor; 12. Low-reflection glass; 13. Fasteners; 14. Internal thread. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below 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 are not intended to limit the invention. Obviously, the described embodiments are only some, not all, of the embodiments described in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0021] Those skilled in the art will understand that, unless otherwise stated, the singular forms “a” and “an” used herein, and “the”, may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0022] The technical terms involved in the embodiments of this invention are defined as follows: Electromagnetic waves are energy generated by the perpendicular oscillation of electric and magnetic fields that propagate in wave form. They are a form of electromagnetic radiation that can propagate in a vacuum without the need for a physical medium. The speed of propagation of electromagnetic waves in a vacuum is the speed of light, approximately 300,000 kilometers per second. Radar waves are electromagnetic waves used in radar systems to detect and locate objects. Radar waves typically operate within the radio and microwave frequency bands, ranging from hundreds of MHz to tens of GHz.

[0023] A sensor is a detection device that can sense the information being measured and transform the sensed information into an electrical signal or other required form of information output according to a certain rule.

[0024] Radar level gauge: A radar level gauge is an instrument used to measure the height (level) of liquids, slurries, or solid materials. It utilizes radar technology to emit electromagnetic waves (usually microwaves) and receive the signals reflected back from the material surface, calculating the material height by measuring the round-trip time of the signals.

[0025] First Embodiment Please see Figure 1 and Figure 2 As shown, this embodiment provides a radar level gauge that reduces electromagnetic wave loss. By dynamically controlling the angle of a low-reflection glass, electromagnetic waves experience minimal loss when passing through the glass, thereby maximizing signal strength. Simultaneously, it achieves structural sealing, preventing damage from salt spray, moisture, corrosive gases, and other substances, thus reducing the overall cost of explosion-proof certification. This includes: Housing 4, housing 4 includes a sealed main cavity 3; The radar electronic module 6 is housed in the main cavity 3 and is used to transmit and receive electromagnetic wave signals. Specifically, in this embodiment, the radar electronic module 6 has signal transmission, processing, control and communication functions, and needs to be connected to a power source from the wiring cavity 7. It supports display and key operation and can control the micro motor 11. The antenna assembly, connected to the main cavity 3, is used to radiate the electromagnetic wave signal emitted by the radar electronic module 6 to the material under test and to receive the reflected echo formed by the radiation of the material under test. Specifically, in this embodiment, an intermediate body 8 and an antenna assembly are connected in sequence at the front end of the main cavity 3. An intermediate body 8 is located on the electromagnetic wave transmission path between the main cavity 3 and the antenna assembly. The intermediate body 8 is equipped with a low-reflection glass 12, which forms a sealed window of the main cavity 3. Specifically, in this embodiment, the electromagnetic wave signal passes through the low-reflection glass 12 of the intermediate body 8, through the cavity of the flange antenna 9, and is finally emitted through the lens 10. When the electromagnetic wave encounters an object, it is reflected. The reflected wave passes sequentially through the lens 10, the cavity of the flange antenna 9, and the low-reflection glass 12 of the intermediate body 8, and is ultimately received by the radar electronic module 6. An angle adjustment mechanism is provided on the intermediate body 8 and connected to the low-reflection glass 12. Specifically, in this embodiment, a low-reflection glass 12 with a thickness of about 16mm is installed on the body of the intermediate body 8. The surface of the low-reflection glass 12 is coated with an anti-reflection film, which constitutes a permanent sealed window at the front end of the main cavity 3. The radar electronic module 6 is configured to: detect the signal strength of the reflected echo in real time, and generate a control signal based on the detected echo signal strength. The angle adjustment mechanism responds to the control signal to dynamically adjust the tilt angle of the low-reflection glass 12 until the signal strength of the reflected echo reaches its maximum value.

[0026] Preferably, the angle adjustment mechanism includes a micro motor 11, the output end of which is connected to the low-reflection glass 12 or its mounting structure. Specifically, in this embodiment, a micro motor 11 is fixed to the intermediate part 8 by fasteners, and its output shaft is connected to the mounting frame of the low-reflection glass 12 through a transmission mechanism (such as a coupling or connecting rod), thereby driving the low-reflection glass 12 to rotate around its horizontal axis within a certain angle range.

[0027] Preferably, the initial installation angle of the low-reflection glass 12 relative to the horizontal plane is 22° to 26°.

[0028] Preferably, the thickness of the low-reflection glass 12 is 15 mm to 18 mm.

[0029] Preferably, the housing 4 is a double-cavity housing 4, including a main cavity 3 and a wiring cavity 7 isolated from each other. The main cavity 3 and the wiring cavity 7 are electrically connected through a sealing structure. Specifically, in this embodiment, the sealing structure has both physical isolation and electrical connection functions. The double-cavity structure can physically isolate the wiring terminals and electronic modules, enhancing safety, improving overall mechanical strength and durability, and making wiring and maintenance more convenient. The sealing structure, which has both physical isolation and electrical connection functions, is fixed between the two cavities by external threads.

[0030] Preferably, the antenna assembly includes a flange antenna 9 and a lens 10. The flange antenna is connected to the intermediate body 8. Specifically, in this embodiment, the lens 10 is connected to the flange antenna 9 by threads.

[0031] Preferably, the intermediate body 8 is connected to the main cavity 3 by a retaining spring, and the flange antenna is connected to the intermediate body 8 by a thread. Specifically, in this embodiment, the intermediate body 8 and the main cavity 3 are quickly connected and fixed by a retaining spring.

[0032] Preferably, it also includes a viewing window cover connected to the main cavity 3. The viewing window cover has a transparent observation window and is externally hinged with a sunshade and rainproof cover. Specifically, in this embodiment, the upper end of the main cavity 3 is connected to a viewing window cover 2 with a transparent observation window, and an externally hinged sunshade and rainproof cover 1. The sunshade and rainproof cover can be opened and closed around its own axis, which is convenient for on-site observation and maintenance. The maximum opening and closing angle with the viewing window cover 2 in the horizontal direction is not less than 135°. The viewing window cover 2 is partially connected to the main cavity 3 of the double cavity shell 4 by threads. The viewing window cover 2 can observe the main cavity 3 through its own glass. The end of the wiring cavity 7 is connected to a blind cover 5 by threads. The blind cover plays a role in sealing and protecting the wiring cavity.

[0033] Preferably, the radar electronic module 6 operates at a frequency of 76 GHz to 81 GHz.

[0034] This embodiment, through the above-mentioned design of dynamically adjustable sealing window, achieves complete sealing of the main cavity 3 and effectively resists external corrosive media, while actively minimizing the penetration loss of electromagnetic waves, significantly improving measurement performance, and reducing explosion-proof certification costs due to structural simplification.

[0035] Second Embodiment Please see Figure 3 As shown, based on the same concept, the present invention also provides a method for reducing electromagnetic wave transmission loss in radar level gauges, comprising the following steps: S1: During the operation of the level gauge, electromagnetic wave signals are emitted to the material to be measured through the radar electronic module, and reflected echo signals are received from the material to be measured.

[0036] More preferably, step S1 includes: S11: After the radar level gauge is powered on, the radar electronic module completes a hardware self-test, reads the current angular position of the low-reflection glass as the initial state, controls the antenna assembly to emit an initial detection electromagnetic wave pulse signal, the initial detection electromagnetic wave pulse signal passes through the low-reflection glass at the current angle and is directed toward the material surface, and receives the returned reflected echo. S12: The radar electronic module processes the received echo signal, extracts and calculates the intensity value of the current echo signal, compares the intensity value of the current echo signal with the historically measured signal intensity value, determines the angle adjustment direction of the low-reflection glass according to preset logic, generates a drive command and sends it to the angle adjustment mechanism, the angle adjustment mechanism drives the low-reflection glass to rotate in a predetermined direction by a preset fixed angle increment, and then re-emits the detection electromagnetic wave and measures the echo signal intensity at the new angle.

[0037] S13: Repeat step S12 until the echo signal intensity begins to decrease after the angle is fine-tuned. Control the low-reflection glass to fine-tune in the opposite direction to the angle position with the maximum signal intensity and enter the locked state. In the locked state, the echo signal intensity is continuously monitored but the angle is not actively adjusted.

[0038] S2: Real-time detection of reflected echo signal strength.

[0039] Preferably, step S2 includes: S21: After amplifying and filtering the received raw echo signal, it is converted into a digital signal by an analog-to-digital converter; S22: Identify and extract the effective echo signal segment within the desired measurement distance gate in the digital domain, and perform high-precision sampling on the amplitude of the effective echo signal segment; S23: Calculate the intensity characterization value of the effective echo signal segment based on the sampled data. The intensity characterization value is any one of peak amplitude, average power, or signal-to-noise ratio. Quantize the calculated intensity value into a digital quantity that can be used for comparison and logical judgment. The peak amplitude is the maximum value of the effective echo signal segment amplitude; the average power is the average power of the effective echo signal segment within a preset time or preset distance window; and the signal-to-noise ratio is the ratio of the effective signal power to the background noise power. S24: Store the quantized real-time signal strength value in a register or buffer, and output it to the control logic unit of the radar electronic module as a criterion for angle optimization evaluation and direction adjustment decision.

[0040] S3: Based on the intensity of the reflected echo signal, generate a control command for adjusting the tilt angle of the low-reflection glass.

[0041] Preferably, step S3 includes: S31: Read the current echo signal strength value, the historical signal strength value corresponding to the current low-reflection glass angle, and the direction of the last angle adjustment (if any). S32: The control logic unit of the radar electronic module analyzes the above data according to the preset algorithm rules to determine the angle adjustment direction and the necessity of adjustment. The preset algorithm rules are either the gradient ascent method or the disturbance observation method.

[0042] S33: Determine the polarity of the drive command based on the adjustment direction, determine the magnitude of the drive command based on the preset adjustment precision, convert the logical decision into an executable electronic control signal, and output it to the driver of the angle adjustment mechanism.

[0043] S34: Update the stored current signal strength and angle values ​​as historical data.

[0044] More preferably, the gradient ascent method and the perturbation observation method include: The gradient ascent method is implemented as follows: the current signal strength is compared with the signal strength before the last adjustment. If the current strength is greater than the historical strength, the angle is adjusted in the same direction. If the current strength is less than or equal to the historical strength, the angle is adjusted in the opposite direction.

[0045] The perturbation observation method is implemented as follows: in each decision cycle, the low-reflection glass is slightly moved to a preset angle in a preset direction, the signal strength after the perturbation is measured and compared with that before the perturbation. If the strength increases, the adjustment direction is maintained; if the strength decreases, the perturbation is canceled and the opposite direction is tried.

[0046] S4: According to the control command, drive the angle adjustment mechanism to dynamically adjust the tilt angle of the low-reflection glass. Specifically, in this embodiment, based on a preset control algorithm (e.g., gradient ascent method), determine whether the current angle of the low-reflection glass is optimal; if not, generate a corresponding PWM control signal to drive the micro motor to move, causing the low-reflection glass to be finely adjusted to a small angle increment in the direction that increases the signal strength.

[0047] Preferably, step S4 includes: S41: The driver of the angle adjustment mechanism receives the control command and parses it to obtain the direction and amplitude of the action.

[0048] S42: The driver applies a corresponding current to the micro-motor coil, driving the rotor to rotate. The rotational motion is converted into the rotation of the low-reflection glass mounting frame around an axis through a mechanical transmission component, wherein the mechanical transmission component is a coupling, a reduction gear set, or a linkage mechanism; the electrical control signal is a PWM wave, a direction pulse, or a serial command; the preset micro-adjustment amount is no greater than 0.1°. S43: Through the transmission ratio design, the low-reflection glass can obtain a preset small adjustment amount, realizing step-by-step fine adjustment; S44: After the angle adjustment is completed, the angle adjustment mechanism locks the position, and the high-precision system generates a position feedback signal through the encoder and sends it back to the radar electronic module.

[0049] S5: Iteratively execute the above steps until the intensity of the reflected echo signal reaches its maximum value. Specifically, in this embodiment, this process is iteratively performed to form a closed-loop feedback control system until the intensity of the reflected echo signal is detected to reach its peak and stabilize. When the low-reflection glass is dynamically adjusted to an angle of approximately 24° with the horizontal plane, the loss of electromagnetic waves penetrating the glass is minimized, and the echo signal is strongest.

[0050] Preferably, step S5 includes: S51: Steps S1 (transmit / receive), S2 (intensity detection), S3 (command generation), and S4 (angle adjustment) are connected in series to form an automated control cycle. After the current cycle ends (i.e., after completing one angle fine-tuning), the next cycle is started immediately or after a very short interval. This process repeats continuously, forming a real-time, uninterrupted "perception-decision-execution" feedback loop.

[0051] S52: In each control cycle, the core decision logic not only determines the direction of the next adjustment, but also uses the direction reversal criterion, the strength stability criterion, and the threshold achievement criterion to continuously evaluate whether the optimization process is close to or has reached the endpoint. S53: Once any of the above convergence criteria is met (usually the direction reversal criterion is the main one), the system determines that the optimal angle under the current operating conditions has been found. The radar electronic module (6) will stop issuing commands to actively adjust the angle, the angle adjustment mechanism will remain stationary, and the low-reflection glass (12) will be fixed at the current angle. The system switches from the optimization mode to the locked measurement mode. In the locked mode, the system continues to periodically execute S1 and S2 (transmission, reception, and intensity detection), but skips S3 and S4 (no longer generating and responding to adjustment commands) and focuses on high-frequency level measurement.

[0052] S54: Even in the locked state, the system will continue to analyze the measured signal strength to monitor its stability. If the continuously monitored signal strength decreases significantly due to factors such as drastic changes in ambient temperature, equipment vibration, or changes in material properties (e.g., below a certain percentage of the strength at the time of locking, or below a certain absolute threshold), it is determined that the current locking angle has deviated from the optimal value. At this time, the system automatically exits the locked state and immediately reactivates the complete closed-loop control process from steps S1 to S4 to start a new round of iterative optimization until a new optimal angle is found and locked again.

[0053] More preferably, convergence criteria include: The direction reversal criterion is that when it is detected that after adjusting the angle in the original direction for two consecutive measurement cycles, the signal strength no longer increases but begins to decrease, it can be determined that the peak point has been passed. At this time, the algorithm will command the angle to be reversed one step. The signal strength stability criterion involves continuously monitoring the rate of change of signal strength. When the fluctuation amplitude of signal strength is less than a preset minimum threshold (i.e., basically stable) over multiple consecutive periods, it can be considered that dynamic equilibrium has been reached near the peak point. The threshold achievement criterion is that when the detected signal strength reaches or exceeds a pre-set expected strength threshold based on a theoretical model or historical data, it is determined that sufficient optimization has been achieved.

[0054] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A radar level gauge that reduces electromagnetic wave loss, characterized in that, include: Housing, the housing including a sealed main cavity; The radar electronic module, housed within the main cavity, is used to transmit and receive electromagnetic wave signals; The antenna assembly, connected to the main cavity, is used to radiate the electromagnetic wave signal emitted by the radar electronic module to the material under test, and to receive the reflected echo formed by the radiation from the material under test. An intermediate body is disposed on the electromagnetic wave transmission path between the main cavity and the antenna assembly. The intermediate body is provided with low-reflection glass, which constitutes a sealing window of the main cavity. An angle adjustment mechanism is provided on the intermediate body and connected to the low-reflection glass; The radar electronic module is configured to: detect the signal strength of the reflected echo in real time, and generate a control signal based on the detected echo signal strength. The angle adjustment mechanism responds to the control signal to dynamically adjust the tilt angle of the low-reflection glass until the signal strength of the reflected echo reaches its maximum value.

2. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, The angle adjustment mechanism includes a micro motor, the output end of which is connected to the low-reflection glass or its mounting structure.

3. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, The initial installation angle of the low-reflection glass relative to the horizontal plane is 22° to 26°.

4. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, The thickness of the low-reflection glass is 15mm to 18mm.

5. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, The housing is a dual-cavity housing, comprising a main cavity and a wiring cavity that are isolated from each other, and the main cavity and the wiring cavity are electrically connected through a sealing structure.

6. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, The antenna assembly includes a flange antenna and a lens, with the flange antenna connected to the intermediate body.

7. The radar level gauge for reducing electromagnetic wave loss according to claim 6, characterized in that, The intermediate body is connected to the main cavity via a snap ring, and the flange antenna is connected to the intermediate body via a thread.

8. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, It also includes a viewing window cover connected to the main cavity, the viewing window cover having a transparent observation window and an externally hinged sun and rain cover.

9. The radar level gauge for reducing electromagnetic wave loss according to claim 1, characterized in that, The radar electronic module operates at a frequency of 76 GHz to 81 GHz.

10. A method for reducing electromagnetic wave transmission loss in a radar level gauge, applied to a radar level gauge as described in any one of claims 1-9, characterized in that, Includes the following steps: The radar electronic module emits electromagnetic wave signals to the material under test and receives the reflected echo signals generated by the radiation from the material under test. Real-time detection of reflected echo signal strength; Based on the intensity of the reflected echo signal, control commands are generated; According to the control command, the drive angle adjustment mechanism is activated to dynamically adjust the tilt angle of the low-reflection glass; The above steps are repeated iteratively until the intensity of the reflected echo signal reaches its maximum value.

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