Device and method for measuring liquid level height of high-temperature fluctuating solution in real time based on laser

Abstract

The invention relates to the technical field of optical fiber sensing, in particular to a device and a method for measuring the height of a high-temperature fluctuating solution liquid level in real time based on laser, accurate measurement is carried out based on the laser reflection principle of the high-temperature solution liquid level, and the instrument can realize high-precision liquid level measurement under the high-temperature condition through automatic operation. In the whole process, human intervention and operation errors are remarkably reduced, the accuracy and efficiency of measurement are improved, and real-time monitoring of the liquid level height of the high-temperature melt is ensured. According to the method, error sources in a traditional method are effectively avoided, the influence of reaction gas and impurities is reduced, and the measurement reliability is improved. By optimizing a laser measurement technology and adopting a brand new device design, the liquid level height of a high-temperature solution can be accurately measured under complex working conditions of high temperature, high airflow, liquid level fluctuation and the like, so that the limitation of a traditional liquid level measurement technology is overcome, and the device has important engineering application value and popularization potential.

Description

Technical Field

[0001] This invention relates to the field of laser measurement and control technology, specifically to a device and method for real-time measurement of the height of a high-temperature fluctuating melt surface based on laser. Background Technology

[0002] Precise measurement of liquid level in high-temperature molten metals has important applications in metallurgy, chemical engineering, and materials science. Especially in high-temperature molten metals or solutions, precise control of the liquid level is crucial for process optimization, product quality assurance, and energy utilization. However, the extreme conditions of high-temperature environments, such as high temperatures, intense thermal radiation, and violent airflow, pose challenges and limitations to traditional liquid level measurement technologies.

[0003] Specifically, during the processing of high-temperature melts, impurities often float on the surface of the melt. These impurities can interfere with the observation of the melt level, making it impossible to accurately measure the true liquid level height. Furthermore, these impurities may affect the precise measurement of the liquid level within the melt container, making level control and adjustment more difficult, thereby impacting the stability and quality of the production process.

[0004] Meanwhile, high-temperature melts often release toxic gases at their high temperatures, which not only pollute the environment but also seriously threaten the health and safety of workers. In this situation, traditional manual measurement methods pose a high safety risk; workers may be exposed to toxic gases, and due to the inconvenience of operating in high-temperature environments, they may face the danger of burns or other accidents.

[0005] The main problems with traditional liquid level measurement methods include:

[0006] 1. High temperature effects: In high temperature environments, mechanical parts are susceptible to thermal expansion, oxidation, corrosion and other factors, which can lead to a decrease in sensor performance and a shortened service life.

[0007] 2. Errors under special liquid surface conditions: Fluctuations and bubbles on the liquid surface may increase sensor error and affect the accuracy of measurement results.

[0008] 3. System complexity: Existing measurement methods usually require multiple sensors to work together, which increases the complexity of the system and makes maintenance more difficult.

[0009] 4. After measurement, molten salt and other reactants easily adhere to the measuring port. After returning to room temperature, a hard molten salt shell will form, which is difficult to clean and will accumulate, affecting the normal operation of the measurement. Summary of the Invention

[0010] The purpose of this invention is to provide a device and method for real-time measurement of the height of a high-temperature fluctuating melt based on laser, which aims to overcome the limitations of traditional liquid level measurement technology in high-temperature environments and to accurately measure the height of the high-temperature melt by utilizing the laser reflection principle of the high-temperature melt surface.

[0011] To achieve the above objectives, the present invention provides a laser-based device for real-time measurement of the height of a fluctuating high-temperature melt, comprising a laser device, a housing, an inner cavity cooling device, an outer cavity venting device, a lifting device, a measuring port, and a control device. The housing is divided into an inner cavity and an outer cavity. The laser device and the inner cavity cooling device are disposed in the inner cavity, and the outer cavity venting device and the lifting device are disposed in the outer cavity. The measuring port is located at the bottom end of the housing. The control device is located away from the housing but is electrically connected to the laser device, the inner cavity cooling device, the outer cavity venting device, and the lifting device.

[0012] The laser device includes a laser emitter, a laser displacement receiver, a light shield, a polarizer, a focusing lens, an aperture stop, and an imaging lens. The laser emitter, the light shield, and the polarizer are arranged in sequence to form the emitting end, and the laser displacement receiver, the aperture stop, and the imaging lens are arranged in sequence to form the receiving end. A gap is provided between the emitting end and the receiving end.

[0013] The device for real-time measurement of high-temperature fluctuating melt level based on laser also includes a bidirectional air pump, which is responsible for providing air source to the inner cavity cooling device and the outer cavity air outlet device.

[0014] The measuring port includes a fixed ring, a telescopic rod, and a clamping ring, which can reciprocate under the drive of the telescopic rod.

[0015] The bottom of the measuring port has multiple small holes that communicate with the outside, and the inside of the measuring port is connected to the air outlet device in the outer cavity.

[0016] Furthermore, this invention also proposes a method for real-time measurement of the height of a high-temperature fluctuating melt surface using laser technology, employing the aforementioned laser-based device for real-time measurement of the height of a high-temperature fluctuating melt surface, comprising the following steps:

[0017] Step 1: Measurement preparation. Start the inner cavity cooling device and the outer cavity air outlet device. Move the measuring port close to the melt surface through the lifting device. After the impurities on the melt surface are blown away, insert the measuring port into the melt and adjust the air pressure to make the liquid surface inside and outside the measuring port level.

[0018] Step 2: After the laser device's emitting end is processed by a filter, polarizer, and focusing lens, the laser beam is focused and directed toward the liquid surface. After the laser irradiates the liquid surface, the diffusely reflected signal passes through the receiving objective lens and aperture stop, and is finally transmitted to the laser receiver. The control device receives the signal and transmits it to the host computer for data processing, calculating and obtaining the real-time liquid level height h and liquid level change Δh.

[0019] Step 3: After the measurement is completed, keep the internal cooling equipment running and turn off the laser device measurement equipment. The lifting device will lift the measurement port upward from the melt. Excess melt in the measurement port will be discharged through the device outlet. The ring device on the measurement port will squeeze the excess reaction liquid remaining on the surface of the measurement port back into the reactor. After the device is moved to the outside and cooled to room temperature, the internal cooling equipment and the external outlet will stop operating, and the measurement work will be completed.

[0020] This invention provides a device and method for real-time measurement of the liquid level of a high-temperature fluctuating melt using laser technology. First, impurities on the surface of the melt inside the reactor are blown away by an external venting device. After the measuring port is inserted into the melt, the air pressure is adjusted to ensure a stable liquid level at the measuring port. Then, the optical measurement stage begins. The laser emitted by the laser device is first focused onto the surface of the object being measured by a filter, polarizer, and focusing lens. After diffuse reflection on the object's surface, the reflected light returns to the receiving end, generating a photoelectric effect. The control device receives the signal and transmits it to a host computer for data processing, calculating the real-time liquid level height. After measurement, the measuring port is removed from the liquid surface using a lifting device, and a ring device is used for self-cleaning. After cooling, the measurement is complete. This invention utilizes the laser reflection principle of the high-temperature molten liquid surface, avoiding the problems of insufficient measurement accuracy in traditional liquid level measurement and the dangers of manual measurement. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the circuit connection of a laser-based device for real-time measurement of the height of a fluctuating melt surface in high temperature, according to a specific embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the principle of a laser-based real-time measurement device for measuring the height of fluctuating melt surface in lava, according to a specific embodiment of the present invention.

[0024] Figure 3This is a magnified schematic diagram of the measurement port in a specific embodiment of the present invention.

[0025] Figure 4 This is an enlarged schematic diagram of the ring device for measuring the port in a specific embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the device appearance according to a specific embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram illustrating the principle of liquid level calculation in a specific embodiment of the present invention.

[0028] Figure 7 This is a flowchart illustrating a method for real-time measurement of the height of a high-temperature fluctuating solution surface based on laser in a specific embodiment of the present invention.

[0029] 1-Controller; 2-Signal processor; 3-Laser emitter; 4-Laser displacement receiver (CCD imaging surface); 5-Shielding mirror; 6-Polarizer; 7-Focusing lens; 8-Aperture stop; 9-Imaging lens; 10-Ventilation inlet of the device cavity; 11-Bidirectional air pump; 12-High temperature resistant alloy shell; 13-Liquid surface to be measured inside the detection port; 14-Receiving objective / imaging lens; 15-Lifting device; 16-Ventilation outlet of the device cavity; 17-High temperature resistant wall of the device cavity; 18-Floating impurities on the surface of the high temperature melt; 19-High temperature melt; 20-Small hole group of the measuring port inlet; 21-Inner wall of the lowest end of the measuring port; 22-Fixing ring; 23-Telescopic rod; 24-High temperature resistant clamping ring. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] This invention provides a laser-based device for real-time measurement of the height of a fluctuating high-temperature melt, comprising a laser device, a housing, an inner cavity cooling device, an outer cavity venting device, a lifting device, a measuring port, and a control device. The housing is divided into an inner cavity and an outer cavity. The laser device and the inner cavity cooling device are disposed in the inner cavity, and the outer cavity venting device and the lifting device are disposed in the outer cavity. The measuring port is located at the bottom end of the housing. The control device is located away from the housing but is electrically connected to the laser device, the inner cavity cooling device, the outer cavity venting device, and the lifting device.

[0032] The laser device includes a laser emitter, a laser displacement receiver, a light shield, a polarizer, a focusing lens, an aperture stop, and an imaging lens. The laser emitter, the light shield, and the polarizer are arranged in sequence to form the emitting end, and the laser displacement receiver, the aperture stop, and the imaging lens are arranged in sequence to form the receiving end. A gap is provided between the emitting end and the receiving end.

[0033] The laser-based real-time measurement device for high-temperature fluctuating melt level also includes a bidirectional air pump, which is responsible for providing air to the inner cavity cooling device and the outer cavity air outlet device.

[0034] The measuring port includes a fixed ring, a telescopic rod, and a clamping ring, which can reciprocate under the drive of the telescopic rod.

[0035] The bottom of the measuring port has multiple small holes that communicate with the outside, and the inside of the measuring port is connected to the air outlet device in the outer cavity.

[0036] Please see Figures 1 to 5 The following is a further explanation with reference to specific embodiments:

[0037] like Figure 1 The diagram shows the circuit connection of the laser-based device for real-time measurement of the height of fluctuating melt surface at high temperatures. Figure 2 This is a schematic diagram of detection in molten lava as an example.

[0038] The specific workflow of the device in this embodiment is as follows:

[0039] First, the control equipment and signal processor are activated to ensure all systems are operating normally. Next, the internal cooling circulation system and the external gas outlet system are simultaneously activated to maintain appropriate temperature and airflow during operation. After these preparations, the robotic arm and lifting device begin to move, gradually inserting the measuring port into the high-temperature melt. Throughout this process, the measuring port continuously emits air to blow away impurities above the melt surface, preventing them from interfering with the measurement. As the measuring port approaches the melt surface, the airflow ensures it can penetrate the impurity layer and enter the melt. At this point, the controller adjusts based on the internal and external pressure difference, balancing the pressure and stopping the airflow to ensure a stable measurement at the measuring port. Next, the device enters the optical measurement phase, as follows:

[0040] The laser emitted by the laser device first passes through a filter, polarizer, and focusing lens to focus the beam onto the surface of the object being measured. After diffuse reflection on the object's surface, the reflected light passes through an imaging lens and an aperture grating, generating a photoelectric effect on the device. The filter removes interfering light sources, enhances the device's ability to shield against stray light, and ensures the accuracy of the laser signal. The polarizer selectively transmits light waves with different polarization directions, shielding unwanted light waves or causing polarization effects on the transmitted light waves, thereby optimizing the characteristics of the laser beam. The focusing lens focuses the parallel beam, producing a laser beam with high collimation. The zero-order Bessel function enhances the stability and accuracy of the laser beam, ensuring linearity in the measurement. The imaging lens receives the reflected light, ensuring that the reflected light forms a clear spot image. The aperture grating is designed with a specific optical aperture, ensuring that the spot formed by the imaging lens can pass through this aperture. This allows the light wave to interact with the wave in front of the grating as it passes through, optimizing the optical imaging system and thus accurately determining the position of the laser spot.

[0041] The device displays the position of the light spot and calculates its displacement, ultimately determining the liquid level height h and its change Δh through a series of calculations. The calculation formulas are derived as follows:

[0042] like Figure 6 As shown, the internal height of the device is H, and the calculation formula is shown in formula (1):

[0043] (1)

[0044] According to the above formula, the distance H between the inside of the laser device and the liquid surface can be calculated. To further accurately measure the liquid level height h, the device will also measure the distance H1 from the laser device to the bottom of the gas furnace; this distance is usually pre-input during equipment installation. By applying formula (2), the liquid level height h can be obtained:

[0045] (2)

[0046] The change in liquid level, Δh, can also be measured using a formula. Figure 2 As shown, the change in liquid level height can be calculated. :

[0047] (3)

[0048] Similarly, at position C, the liquid level can be obtained as follows:

[0049] (4)

[0050] The changes in height at points B and C can be measured:

[0051] Δh = Δh1 - Δh2 (5)

[0052] Through this series of measurements and calculations, the device can accurately obtain the liquid level of the high-temperature melt, ensuring real-time monitoring and control of the liquid level during production. This automated measurement technology not only improves the accuracy and efficiency of measurements but also greatly reduces the safety risks for operators working in high-temperature environments, ensuring the stability and safety of the production process.

[0053] In the formula, the intersection point of the laser beam and the initial liquid surface in the symmetrical state is A, and the included angle is... After the liquid level changes, the laser beam intersects the changing liquid surface at points B and C. After reflection from the changing liquid surface, the beam passes through the imaging lens and strikes the laser displacement receiver (CCD) at points B' and C', with an included angle of θ. , The liquid level heights at the first and second changes compared to the liquid level height at the symmetrical position. .

[0054] Through this series of measurements and calculations, the device can accurately obtain the liquid level of the high-temperature melt, ensuring real-time monitoring and control of the liquid level during production. This automated measurement technology not only improves the accuracy and efficiency of measurements but also greatly reduces the safety risks for operators working in high-temperature environments, ensuring the stability and safety of the production process.

[0055] In the formula, the intersection point of the laser beam and the initial liquid surface in the symmetrical state is A, and the included angle is... After the liquid level changes, the laser beam intersects the changing liquid surface at points B and C. After reflection from the changing liquid surface, the beam passes through the imaging lens and strikes the laser displacement receiver (CCD) at points B' and C', with an included angle of θ. , The liquid level heights at the first and second changes compared to the liquid level height at the symmetrical position. .

[0056] Furthermore, this invention also proposes a method for real-time measurement of the height of a high-temperature fluctuating melt surface using laser technology, employing the aforementioned laser-based device for real-time measurement of the height of a high-temperature fluctuating melt surface, comprising the following steps:

[0057] Step 1: Measurement preparation. Start the inner cavity cooling device and the outer cavity air outlet device. Move the measuring port close to the melt surface through the lifting device. After the impurities on the melt surface are blown away, insert the measuring port into the melt and adjust the air pressure to make the liquid surface inside and outside the measuring port level.

[0058] Step 2: After the laser device's emitting end is processed by a filter, polarizer, and focusing lens, the laser beam is focused and directed toward the liquid surface. After the laser irradiates the liquid surface, the reflected signal passes through the receiving objective lens and aperture stop, and is finally transmitted to the laser receiver. The control device receives the signal and transmits it to the host computer for data processing, calculating and obtaining the real-time liquid level height h and liquid level change Δh.

[0059] Step 3: After the measurement is completed, drain the liquid from the measuring port, keep the internal cooling equipment running, turn off the laser device measuring equipment, lift the measuring port out of the melt, and use the ring device on the measuring port to squeeze the excess reaction liquid back into the reactor. After the external devices have cooled to room temperature, the internal cooling equipment and the external gas outlet equipment stop operating, and the measurement work is completed.

[0060] The following description, in conjunction with an embodiment and workflow, illustrates the process, which is mainly divided into three stages: preparation, measurement, and termination. The entire process is accomplished through the coordinated work of the controller, signal processor, and actuator. The specific flow is as follows: Figure 7 The diagram shows a flowchart of the device for detecting liquid level.

[0061] The first stage is preparation. During this stage, the control system activates and controls the airlock valves in the inner and outer chambers of the device, activating the cooling circulation system in the inner chamber. Simultaneously, the bidirectional air pump in the outer chamber begins operation, ejecting gas. This air ejection is crucial; it blows away impurities floating on the molten surface, preventing them from interfering with the measurement process and ensuring smooth contact between the measuring port and the molten surface. Subsequently, the system automatically adjusts the air pressure in the outer chamber to ensure that the liquid levels inside and outside the measuring port are consistent, thus avoiding measurement errors caused by liquid level imbalances.

[0062] The next stage is measurement. In this stage, the laser emitting device begins emitting a laser beam. After passing through a filter, polarizer, and focusing lens, the laser beam is focused and directed towards the liquid surface. Once the laser hits the liquid surface, the reflected signal passes through the receiving objective lens and aperture stop, ultimately reaching the laser receiver (CCD). The receiver captures the reflected signal and transmits it to the signal processing system. Upon receiving the signal, the signal processor processes the data using a computer. Based on calculation formulas and combining data such as the laser incident angle θ1 and the displacement Δl on the receiving plate, the system uses a precise mathematical model to convert the laser beam's behavior into real-time liquid surface height h and liquid surface change Δh.

[0063] Finally, the finishing stage begins. Once the measurement is complete, the jet nozzle in the outer cavity of the device opens, draining the liquid from the detection port. Simultaneously, the internal cooling system continues operating, and the optical measurement equipment is shut down. Next, the robotic arm and lifting device remove the measurement port from the liquid surface and the reactor. The ring telescopic device then begins operation, repeatedly extending and retracting to squeeze excess reaction liquid adhering to the device's port surface back into the reaction tank. The device is then set aside to cool. Once the device has cooled to room temperature, the jet nozzle and internal cooling system cease operation, completing the entire process.

[0064] Through this series of automated operations, the instrument can achieve high-precision liquid level measurement under high-temperature conditions. The entire process significantly reduces human intervention and operational errors, improves measurement accuracy and efficiency, and ensures real-time monitoring of the high-temperature molten liquid level. This technology effectively avoids the sources of error in traditional methods, reduces the influence of reactive gases and impurities, improves measurement reliability, and avoids direct contact between the equipment and the high-temperature environment, thereby extending the instrument's service life.

[0065] In summary, compared with the prior art, the present invention has the following advantages:

[0066] 1. Solves the problem of instrument damage caused by direct measurement methods: Traditional direct contact measurement methods, when used with high-temperature melts, are prone to damage due to thermal expansion and corrosion caused by prolonged exposure to extremely high temperatures. This not only reduces the lifespan of the equipment but also increases maintenance and replacement costs. By adopting laser indirect measurement technology, the laser beam does not directly contact the surface of the high-temperature melt, effectively avoiding the various damages caused by direct contact. The laser device can perform high-precision measurements without contacting the melt, greatly extending the lifespan of the instrument and reducing the failure rate. The non-contact advantage of laser technology not only improves the durability of the equipment but also makes maintenance more convenient and economical, reducing production downtime and repair cycles caused by equipment damage.

[0067] 2. Solves the problem of inaccurate measurement of high-temperature melt levels: Measurement of high-temperature melt levels often faces interference from impurity layers floating on the surface, which can affect the accuracy of the measurement results. Traditional measurement methods often fail to effectively eliminate these impurities, leading to significant errors in melt level measurement. By introducing gas ejected from the measuring port, this airflow effectively blows away impurities on the surface, allowing the laser beam to accurately illuminate the melt surface and avoiding the influence of the impurity layer on the measurement results. The gas injection not only eliminates floating impurities but also ensures the stability of the measuring port, preventing impurities from interfering with the measuring equipment. This innovative design ensures more accurate and scientific melt level measurement, meeting practical operational needs and making real-time monitoring of melt level height more feasible and reliable.

[0068] 3. Flexibility and Adjustability of the Equipment: Compared to other traditional measuring devices, this device is more flexible and adaptable. Its unique design allows the lens angle of the laser device to be adjusted according to needs. By changing the laser emission angle, the laser beam can be accurately aligned with the liquid surface and quickly measure the liquid level. This adjustment mechanism allows the device to be used flexibly under various working conditions, especially in high-temperature environments. Even if the high-temperature outer shell is damaged, the device can quickly replace the damaged parts, ensuring continuous system operation. In addition, the cooperation of the robotic arm and lifting device allows the height of the instrument to be adjusted in a timely manner according to actual needs. No matter where in the furnace, the device can be set to the optimal angle and position for liquid level measurement. Through this height-adjustable design, the device not only improves the measurement accuracy but also greatly enhances its adaptability and flexibility, enabling measurements to adapt to different working conditions and environmental conditions, ensuring efficient liquid level monitoring, and achieving ideal measurement results in complex furnace operating environments or under special process requirements.

[0069] 4. This device solves the problem of fluctuating liquid levels in the reactor due to the vigorous reaction, which makes measurement difficult or inaccurate. The device uses a port that extends far below the reaction liquid surface, with a very small inlet, allowing all the gas produced in the reaction to escape through the top. The liquid level in the sealed port is unaffected by the gas produced in the reaction, resulting in minimal fluctuations. By balancing the internal and external gas pressures, the liquid level in the sealed port is made the closest approximation of the liquid level to be measured, thus enabling accurate measurement of fluctuating liquid levels.

[0070] 5. After measurement, when the device is removed from the reactor, a layer of high-temperature molten salt will adhere to its surface. As it cools, this molten salt will solidify and form a hard outer shell, especially at the air inlet, which can easily clog the small holes and affect subsequent measurements. To solve this problem, after the device is removed from the reactor, a cleaning ring device is activated. By repeatedly extending and retracting the high-temperature resistant clamping ring, the molten salt and other reactants adhering to the device's port surface can be squeezed back into the reaction tank. Simultaneously, the cooling and ventilation devices will continue to operate until the device gradually cools down, ensuring that the openings remain unobstructed and preventing clogging.

[0071] The above description discloses only one or more preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A device for real-time measurement of the height of a high-temperature fluctuating melt surface based on laser, characterized in that, The device includes a laser device, a housing, an internal cavity cooling device, an external cavity venting device, a lifting device, a measuring port, and a control device. The housing is divided into an internal cavity and an external cavity. The laser device and the internal cavity cooling device are located in the internal cavity, and the external cavity venting device and the lifting device are located in the external cavity. The measuring port is located at the bottom of the housing. The control device is located away from the housing but is electrically connected to the laser device, the internal cavity cooling device, the external cavity venting device, and the lifting device. The laser device includes a laser emitter, a laser displacement receiver, a light shield, a polarizer, a focusing lens, an aperture stop, and an imaging lens. The laser emitter, the light shield, and the polarizer are arranged in sequence to form the emitting end, and the laser displacement receiver, the aperture stop, and the imaging lens are arranged in sequence to form the receiving end. A gap is provided between the emitting end and the receiving end.

2. The device for real-time measurement of high-temperature fluctuating melt level height based on laser as described in claim 1, characterized in that, The laser-based real-time measurement device for high-temperature fluctuating melt level also includes a bidirectional air pump, which is responsible for providing air to the inner cavity cooling device and the outer cavity air outlet device.

3. The device for real-time measurement of high-temperature fluctuating melt level height based on laser as described in claim 1, characterized in that, The measuring port includes a fixed ring, a telescopic rod, and a clamping ring, which can reciprocate under the drive of the telescopic rod.

4. The device for real-time measurement of high-temperature fluctuating melt level height based on laser as described in claim 1, characterized in that, The bottom of the measuring port has multiple small holes that communicate with the outside, and the inside of the measuring port is connected to the air outlet device in the outer cavity.

5. A method for real-time measurement of the height of a high-temperature fluctuating melt surface based on laser, employing the laser-based device for real-time measurement of the height of a high-temperature fluctuating melt surface as described in any one of claims 1 to 4, characterized in that... Includes the following steps: Step 1: Measurement preparation. Start the inner cavity cooling device and the outer cavity air outlet device. Move the measuring port close to the melt surface through the lifting device. After the impurities on the melt surface are blown away, insert the measuring port into the melt and adjust the air pressure to make the liquid surface inside and outside the measuring port level. Step 2: After the laser device's emitting end is processed by a filter, polarizer, and focusing lens, the laser beam is focused and directed toward the liquid surface. After the laser irradiates the liquid surface, the diffusely reflected signal passes through the receiving objective lens and aperture stop, and is finally transmitted to the laser receiver. The control device receives the signal and transmits it to the host computer for data processing, calculating and obtaining the real-time liquid level height h and liquid level change Δh. Step 3: After the measurement is completed, keep the internal cooling equipment running and turn off the laser device measurement equipment. The lifting device will lift the measurement port upward from the melt. Excess melt in the measurement port will be discharged through the device outlet. The ring device on the measurement port will squeeze the excess reaction liquid remaining on the surface of the measurement port back into the reactor. After the device is moved to the outside and cooled to room temperature, the internal cooling equipment and the external outlet will stop operating, and the measurement work will be completed.

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