A multi-parameter joint feedback control method and system for quartz wire drawing

Abstract

This invention relates to the field of fused silica wire drawing apparatus, and more specifically, to a multi-parameter joint feedback control method and system for drawing silica wire. This invention can jointly control the drawing speed, feeding speed and laser power of silica wire based on the diameter of the silica wire and the temperature of the heating zone, thereby achieving uniform stress distribution and diameter of the silica wire, effectively ensuring the repeatability of various parameters of the drawn silica wire, and further improving the fracture strength, quality factor and torsion balance system sensitivity of the silica wire.

Description

Technical Field

[0001] This invention relates to the field of fused silica wire drawing apparatus, and more specifically, to a multi-parameter joint feedback control method and system for fused silica wire drawing. Background Technology

[0002] Precision torsion balances are essential tools for measuring weak forces and have significant applications in scientific research. For a torsion balance system, parameters such as the material, length, diameter, quality factor, and torsional elastic coefficient k-value of the torsion wire significantly influence the sensitivity of the entire system. The quality factor and load-bearing capacity of quartz wire are generally related to its structural defects and diameter. However, during the drawing process, various factors can cause changes in the diameter of the quartz wire and the temperature of the heating zone, easily leading to internal breakage and affecting the quality of the quartz wire. Currently, mature optical fiber technology cannot be directly applied to torsion balances due to impurities introduced during the drawing process. Therefore, lasers, which offer advantages such as pollution-free heating and precise power control, are selected as the heating source in the quartz wire drawing device. However, the fluctuations in laser power and the speed of the displacement stage during this process can lead to non-uniformity in the diameter of the quartz wire. This poses a risk to the required quality factor, sensitivity, and fracture strength in the experiment. Experiments have shown that the diameter and fracture strength of the drawn quartz wire are related to the laser power, drawing speed, and feeding speed. Furthermore, for quartz wires of the same diameter, these three parameters need to be matched to achieve uniform diameter and stress distribution, as well as a high quality factor. Therefore, it is necessary to design a good multi-parameter joint feedback system to control the laser power and displacement stage speed during the drawing process, thereby improving the diameter uniformity and fracture strength of the quartz wire, as well as improving the stress distribution inside the quartz wire, and enhancing the quality factor and sensitivity of the torsion balance system.

[0003] Currently, the research team at the University of Glasgow has achieved relatively mature research on the laser-heated fused silica twisting and drawing process. By detecting the brightness of the heated area or directly monitoring the laser power, and controlling the laser power through PID feedback, they have achieved stable brightness in the heated area, resulting in more uniform quartz wire diameter and improved, more concentrated, fracture strength. However, this method has limited diameter control capabilities, depending on the temperature-dependent relationship between the quartz wire diameter and the diameter. Experiments have revealed that the drawing speed of the displacement stage and the feeding speed also affect the diameter and mechanical properties of the quartz wire. Simply controlling one factor does not achieve the desired level of diameter uniformity and mechanical properties, and it is prone to errors in controlling light saturation phenomena that occur during the drawing process. Furthermore, the brightness of the heated quartz rod or direct monitoring of the emitted laser power is insufficient to accurately reflect the temperature of the heated area. Although the research team at Huazhong University of Science and Technology has achieved the drawing of fused silica twisted wire, they have not yet fully solved the above problems. Drawing quartz wires with diameters in the tens of micrometers in a single process requires the use of a 2-diameter... For quartz rods with a diameter of approximately 2 mm, it is necessary to monitor the melting and boiling states of the material during the drawing process. Currently, the mainstream thermometers such as pyrometers and thermocouples cannot adequately meet the measurement requirements of up to 2700 ℃ for objects with a diameter of approximately 2 mm. Therefore, a sensor with a higher range is needed to indicate the temperature of the material during the drawing process. Summary of the Invention

[0004] To overcome the problems described in the prior art where various factors can cause changes in the diameter and temperature of the quartz wire during quartz wire drawing, leading to internal breakage of the quartz wire and thus affecting its quality, this invention provides a multi-parameter joint feedback control method and system for quartz wire drawing.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] A multi-parameter joint feedback control system for drawing quartz wire includes a laser source module, a diameter monitoring module, a spectral detection module, a quartz rod, a conical mirror, and a drawing module. The laser source module emits laser light, which passes through the conical mirror and is focused onto a heating area, which is the area where the laser light converges onto the surface of the quartz rod. The spectral detection module detects the temperature information of the heating area. The drawing module draws the quartz wire from the quartz rod. The diameter monitoring module acquires the diameter information of the quartz wire drawn from the quartz rod. Based on the diameter information and temperature information fed back by the diameter monitoring module and the spectral detection module, the drawing speed of the drawing module and the laser power of the laser source module are controlled.

[0007] Furthermore, the spectral detection module includes a visible light sensor, a near-infrared sensor, a feedback control host computer, and an infrared sensor. The visible light spectral sensor, the near-infrared sensor, and the infrared sensor monitor the thermal radiation spectrum of the heating area of ​​the quartz rod in real time, and then the temperature information is obtained by the feedback control host computer based on the monitored thermal radiation spectrum.

[0008] Furthermore, the diameter monitoring module acquires an image of the quartz filament, extracts the pixel positions corresponding to the boundaries of the quartz filament from the image, and fits the pixel positions to obtain the diameter information of the quartz filament.

[0009] Furthermore, the drawing module includes a displacement stage, an upper clamp, and a lower clamp. The upper clamp and the lower clamp clamp the quartz rod. The upper clamp is fixed below the displacement stage and is fixedly installed on the displacement stage. The lower clamp is installed below the quartz rod. The movement of the displacement stage drives the upper clamp to pull the quartz wire out of the quartz rod.

[0010] Furthermore, the step of pulling the quartz wire from the quartz rod by moving the displacement stage specifically involves: when the displacement stage accelerates upward according to an S-shaped acceleration curve to pull the quartz wire from the quartz rod, when the displacement stage finishes pulling the quartz wire, the displacement stage decelerates upward according to an S-shaped deceleration curve until it comes to a stop, and then moves downward by a preset stroke.

[0011] Furthermore, the multi-parameter joint feedback control method is applied to a multi-parameter joint feedback control system for quartz wire drawing. The multi-parameter joint feedback control method includes the following steps:

[0012] S1: Calculate the relationship between the drawing speed of the drawing module and the diameter of the quartz wire, and the relationship between the laser power of the laser source module and the temperature of the quartz rod.

[0013] S2: The laser source module heats the heating area, and the temperature of the heating area is detected by the spectrum detection module. When the temperature reaches the threshold, the drawing module starts to draw the quartz wire from the quartz rod.

[0014] S3: During the drawing process, the diameter monitoring module and the spectral detection module return the diameter information of the quartz wire and the temperature information of the heating area of ​​the quartz rod in real time.

[0015] S4: The drawing module adjusts the drawing speed based on the quartz wire diameter returned in real time by the diameter monitoring module obtained in step S3 and the relationship between the drawing speed of the drawing module and the quartz wire diameter obtained in step S1. It adjusts the feeding speed based on the drawing speed, adjusts the laser power based on the feeding speed and the temperature information of the heating area of ​​the quartz rod returned in real time by the spectral detection module obtained in step S3, and stabilizes the temperature of the heating area based on the relationship between the laser power of the laser source module and the temperature of the quartz rod obtained in step S1.

[0016] Furthermore, in step S1, the relationship between the drawing speed of the drawing module and the heating zone 5 of the quartz rod is calculated as follows:

[0017]

[0018] In the formula, The diameter of the quartz wire, To control the speed, The coefficient for controlling the drawing speed using real-time diameter monitoring results, It is the first constant.

[0019] Furthermore, in step S1, the relationship between the laser power of the laser source module and the temperature of the quartz rod is as follows:

[0020]

[0021] In the formula, As a coefficient for temperature-controlled laser power, The temperature of the heating zone, For laser power, It is the second constant.

[0022] Furthermore, in step S4, the feeding speed is calculated from the calculated drawing speed:

[0023]

[0024] In the formula, To increase the feeding speed, The radius of quartz wire 6, Let be the radius of the quartz rod.

[0025] Furthermore, the laser power of the laser source module is readjusted based on the calculated feed rate:

[0026]

[0027] In time interval Inside, This represents the temperature change of the quartz rod. For the quality of the quartz rod, The density of the quartz rod, Let the radius of the quartz rod be . For laser power, This is the specific heat capacity of the quartz rod.

[0028] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0029] This invention utilizes the simultaneous feedback control of quartz wire temperature and diameter to regulate laser power, drawing speed, and feeding speed, ensuring temperature stability and parameter matching during the drawing process. It effectively overcomes irregular diameter variations caused by changes in the raw quartz wire material, ensuring uniform stress distribution and diameter uniformity, improving the sensitivity of the torsion balance, and effectively eliminating major factors causing changes in the mechanical properties of the quartz wire. This further improves the quality factor of the quartz wire, reduces its torsional elastic coefficient, and enhances its sensitivity. It overcomes the limitations of directly measuring small-scale high temperatures using traditional pyrometers, ensuring the accuracy of the detected temperature. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the multi-parameter joint feedback control system made of quartz wire described in this invention;

[0031] Figure 2 This is a schematic diagram of the blackbody radiation curve described in this invention;

[0032] Figure 3 This is a flowchart illustrating the multi-parameter joint feedback control method described in this invention.

[0033] The components include: 1. Laser source module; 2. Diameter monitoring module; 3. Spectrum detection module; 4. Upper clamp; 5. Heating area; 6. Quartz rod; 7. Conical mirror; 8. Lower clamp; and 9. Displacement stage. Detailed Implementation

[0034] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0035] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions;

[0036] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings.

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] A multi-parameter joint feedback control system for quartz wire drawing, such as Figure 1As shown, the system includes a laser source module 1, a diameter monitoring module 2, a spectral detection module 3, a quartz rod 6, a conical mirror 7, and a drawing module. The laser source module 1 emits a laser beam that passes through the conical mirror 7, which focuses the laser beam onto a heating region 5. The heating region 5 is the area where the laser beam converges onto the surface of the quartz rod 6. The spectral detection module 3 detects the temperature information of the heating region 5. The drawing module draws a quartz filament from the quartz rod 6. The diameter monitoring module 2 acquires the diameter information of the quartz filament drawn from the quartz rod 6. Based on the diameter information and temperature information fed back by the diameter monitoring module 2 and the spectral detection module 3, the drawing speed of the drawing module and the laser power of the laser source module 1 are controlled.

[0040] This invention proposes to simultaneously monitor the diameter of the quartz wire and the temperature of the heating zone in real time as feedback control input signals, and simultaneously control the wire drawing speed, feeding speed and laser power to match the three and achieve optimal wire drawing process conditions. This improves the repeatability of the mechanical properties of the quartz wire, increases the breaking strength of the quartz wire, and also improves the uniformity of stress distribution in the diameter, resulting in a significant improvement in the quality factor of the quartz wire.

[0041] Example 2

[0042] This embodiment, based on Embodiment 1, continues to disclose the following content:

[0043] The spectral detection module 3 includes a visible light sensor, a near-infrared sensor, a feedback control host computer, and an infrared sensor. The visible light spectral sensor, near-infrared sensor, and infrared sensor monitor the thermal radiation spectrum of the heating area 5 in real time. Then, the feedback control host computer obtains temperature information based on the monitored thermal radiation spectrum. The visible light, near-infrared, and infrared light spectra of the heating area are detected by the spectral detector, and the temperature is calculated. The visible light spectral sensor, near-infrared light sensor, and mid-infrared light sensor directly detect the spectrum of the heating area to achieve high temperature detection in a small heating area. This can ensure the accuracy of the temperature used during control and reduce the error of estimating the temperature of the heating material area by measuring the temperature of other locations.

[0044] During implementation, considering that current pyrometers are difficult to monitor temperatures up to 2700°C for millimeter-sized quartz rods, this invention obtains the relationship between the measured spectral signal and the temperature of the heating area based on the laws of thermal radiation spectrum. During the quartz rod preheating stage, the spectral detection module 3 acts as a temperature detector. When the temperature reaches the pullable state, it can send a trigger signal to the pulling module. After the pulling begins, the temperature of the heating area is detected in real time.

[0045] The main principle behind the spectral detection module 3 is that the graph of Planck's blackbody radiation formula has a peak, and this peak changes with temperature. When the temperature reaches 2700 ℃, the peak of the curve shifts to around 880 nm. Figure 2 As shown in the figure, the blackbody radiation curve shows that a large portion of the radiation energy falls within the visible spectrum. Therefore, it is necessary to detect the visible light spectrum. During detection, since the high-temperature region of the feed is a cone with a bottom diameter of 2 mm and a height of 2 mm, when only an infrared detector is used, the infrared spectrum of other objects at room temperature will have a significant impact on the measured infrared spectrum intensity. However, when drawing quartz wire, the entire device is placed in a dark environment, so there is almost no visible light influence. But when heated, the heating region will emit visible light spectrum, so the error of detecting the visible light spectrum of the high-temperature region of the feed is very small. In summary, when detecting the temperature of the heating region of the quartz rod, visible light, near-infrared and infrared spectra are detected simultaneously. In addition, the background signal before heating is subtracted first during data processing, and then the results of the multi-band spectral signals are integrated together. The temperature is fitted according to the blackbody radiation formula (1) to confirm the temperature of the heating region. The added visible light spectral sensor not only reduces the influence of infrared radiation from other objects during fitting, but also eliminates the step of finding the heating region, simplifies the algorithm, and reduces the delay time of feedback control.

[0046]

[0047] In the above formula, It is the spectral radiant flux density. Where λ is the wavelength, h = 6.6256 × 10⁻³⁴ J·s is Planck's constant; c is the speed of light, and k is Boltzmann's constant. This refers to absolute temperature.

[0048] Example 3

[0049] Based on Examples 1 and 2, this embodiment continues to disclose the following content:

[0050] The diameter monitoring module 2 acquires an image of the quartz wire, extracts the pixel positions corresponding to the boundaries of the quartz wire from the image, and fits the pixel positions to obtain the diameter information of the quartz wire.

[0051] The drawing module includes a displacement stage, an upper clamp 4, and a lower clamp 8. The upper clamp 4 and the lower clamp 8 clamp the quartz rod 6. The upper clamp 4 is fixed below the displacement stage 9 and is fixedly installed on the displacement stage. The lower clamp is installed below the quartz rod. By moving the displacement stage, the upper clamp 4 is driven to pull the quartz wire out of the quartz rod 6. The displacement stage drives the conical mirror 7 to move downward to ensure sufficient raw material during the drawing process.

[0052] The step of pulling the quartz wire from the quartz rod 6 by moving the displacement stage is as follows: when the displacement stage 9 accelerates upward according to the S-shaped acceleration curve to pull the quartz wire from the quartz rod 6, when the displacement stage finishes pulling the quartz wire 6, the displacement stage decelerates upward according to the S-shaped deceleration curve until it stops, and then moves downward by a preset stroke.

[0053] Example 4

[0054] Based on Examples 1, 2, and 3, this embodiment continues to disclose the following content:

[0055] The multi-parameter joint feedback control method is applied to a multi-parameter joint feedback control system for quartz wire drawing as described in Example 1, such as... Figure 3 As shown, the multi-parameter joint feedback control method includes the following steps:

[0056] S1: Calculate the relationship between the drawing speed of the drawing module and the diameter of the quartz wire, and the relationship between the laser power of the laser source module 1 and the temperature of the quartz rod 6. The function of the laser source module 1 is to complete the heating and melting of the quartz rod. It consists of a CO2 laser, a reflector, a lens group, a cylindrical mirror, a beam lifter, a 45° reflector, a conical reflector, a reflecting conical mirror, and a converging conical mirror. The laser emitted by the CO2 laser reaches the surface of the quartz rod after subsequent optical path adjustment, thus completing the heating and melting of the quartz rod.

[0057] S2: The laser source module 1 heats the heating area 5, and the temperature of the heating area 5 is detected by the spectrum detection module 3. When the temperature reaches the threshold, the drawing module starts to draw the quartz wire from the quartz rod 6.

[0058] S3: During the drawing process, the diameter monitoring module 2 and the spectrum detection module 3 return the diameter information of the quartz wire and the temperature information of the heating area 5 of the quartz rod 6 in real time.

[0059] S4: The drawing module adjusts the drawing speed based on the quartz wire diameter returned in real time by the diameter monitoring module 2 obtained in step S3 and the relationship between the drawing speed and the quartz wire diameter obtained in step S1. It adjusts the feeding speed based on the drawing speed, adjusts the laser power based on the feeding speed and the temperature information of the heating area 5 of the quartz rod 6 returned in real time by the spectrum detection module 3 obtained in step S3, and stabilizes the temperature of the heating area 5 based on the relationship between the laser power of the laser source module 1 and the temperature of the quartz rod 6 obtained in step S1. After the drawing displacement stage stops, the feeding module, laser, and spectrum detection module are stopped to avoid the quartz wire breaking or melting at the end. Finally, all modules of the equipment are shut down in an orderly manner, the quartz wire is removed, and the drawing process is completed.

[0060] In the specific implementation process, the relationship between various parameters in the control process is as follows: the drawing speed is controlled based on the real-time monitoring results of the quartz wire diameter. However, due to the change in the drawing speed, the amount of molten raw material will change. Therefore, it is necessary to change the feeding speed to a value that matches the drawing speed to ensure that the amount of molten raw material remains constant during the drawing process. Therefore, it is necessary to change the laser power at the same time to ensure that the temperature of the new heating area remains constant. The temperature of the heating area needs to be detected by the aforementioned spectral detection module and used as a feedback source to control the laser power. Before formally using multi-parameter joint feedback control to draw the quartz wire, the control characteristic parameters of the device are measured first, mainly including the relationship between the drawing speed and the quartz wire diameter, and the relationship between the heating laser power and the temperature or spectrum of the molten quartz raw material. In step S1, the relationship between the drawing speed of the drawing module and the heating area 5 of the quartz rod 6 is calculated as follows:

[0061]

[0062] In the formula, The diameter of the quartz wire, To control the speed, The coefficient for controlling the drawing speed using real-time diameter monitoring results, As the first constant, regarding the relationship between quartz wire diameter and drawing speed, it is possible to obtain quartz wires of different diameters by changing only the drawing speed while keeping all parameters consistent, and then linearly fitting the diameter... With drawing speed Relationship

[0063] In step S1, the relationship between the laser power of the laser source module 1 and the temperature of the quartz rod 6 is as follows:

[0064]

[0065] In the formula, As a coefficient for temperature-controlled laser power, The temperature of heating zone 5, For laser power, It is the second constant.

[0066] After confirming the diameters of the quartz rod and quartz wire, (4) the feed rate corresponding to the current drawing speed is calculated and sent to the displacement stage controller to change the feed rate. In step S4, the feed rate is calculated from the calculated drawing speed:

[0067]

[0068] In the formula, To increase the feeding speed, The radius of quartz wire 6, The temperature change in the new heating zone caused by the change in feed rate, which is the radius of the quartz rod, can be addressed by changing the laser power. By using multi-band spectral monitoring to monitor the temperature reached in the heating area within the same time period, and linearly fitting the laser power and the temperature of the heating area, a relationship between the two is obtained. This process ensures both the stability of the heating area temperature and the matching degree of various drawing parameters. The laser power of the laser source module 1 is then readjusted based on the calculated feeding speed.

[0069]

[0070] In time interval Inside, This represents the temperature change of the quartz rod. For the quality of the quartz rod, The density of the quartz rod, Let the radius of the quartz rod be . For laser power, The specific heat capacity of the quartz rod is used, but if the laser power is not adjusted after changing the feed rate, the temperature reached by the raw material will vary, especially during the time interval. Within, the relationship between the temperature change of the newly added raw material and the change in feeding rate.

[0071] In the specific implementation process, the diameter monitoring module 2 and the temperature detection module 3 are always in working condition during the drawing process, together forming the control system of the device. They monitor the diameter of the quartz wire 6 and the temperature of the drawing area 5 in real time. The real-time monitored diameter of the quartz wire is determined according to a coefficient. Feedback control of drawing speed: When the drawing speed changes, program (4) sets the feeding speed to a value that matches the drawing speed. The temperature detection module detects the temperature of the heating zone according to a coefficient. Feedback control of the laser power ensures that the temperature of the heating zone remains stable even after changes in the feeding speed. The feeding module, laser, and spectral detection module are stopped only after the drawing displacement table stops, preventing the quartz wire from breaking or melting at the end. Finally, all modules of the equipment are shut down in an orderly manner, the quartz wire is removed, and the drawing process is completed.

[0072] The same or similar labels correspond to the same or similar parts;

[0073] The terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-parameter joint feedback control system for quartz wire drawing, characterized in that, The system includes a laser source module (1), a diameter monitoring module (2), a spectral detection module (3), a quartz rod (6), a conical mirror (7), and a drawing module. The laser source module (1) emits a laser beam that passes through the conical mirror (7). The conical mirror (7) focuses the laser beam onto a heating area (5). The heating area (5) is the area where the laser beam converges onto the surface of the quartz rod (6). The spectral detection module (3) detects the temperature information of the heating area (5). The drawing module draws a quartz filament from the quartz rod (6). The diameter monitoring module (2) obtains the diameter information of the quartz filament drawn from the quartz rod (6). Based on the diameter information and temperature information fed back by the diameter monitoring module (2) and the spectral detection module (3), the drawing speed of the drawing module drawing the quartz filament from the quartz rod (6) and the laser power of the laser source module (1) are controlled. The spectral detection module (3) includes a visible light sensor, a near-infrared sensor, a feedback control host computer, and an infrared sensor. The visible light sensor, near-infrared sensor, and infrared sensor monitor the thermal radiation spectrum of the heating area (5) in real time, and then obtain temperature information based on the monitored thermal radiation spectrum through the feedback control host computer. The system employs a multi-parameter joint feedback control method for drawing quartz wires, the method comprising the following steps: S1: Calculate the relationship between the drawing speed of the drawing module and the diameter of the quartz wire, and the relationship between the laser power of the laser source module (1) and the temperature of the quartz rod (6); S2: The laser source module (1) heats the heating area (5), and the temperature of the heating area (5) is detected by the spectrum detection module (3). When the temperature reaches the threshold, the drawing module starts to draw the quartz wire from the quartz rod (6). S3: During the drawing process, the diameter monitoring module (2) and the spectrum detection module (3) return the diameter information of the quartz wire and the temperature information of the heating area (5) of the quartz rod (6) in real time; S4: The drawing module adjusts the drawing speed according to the diameter of the quartz wire returned in real time by the diameter monitoring module (2) obtained in step S3 and the relationship between the drawing speed of the drawing module and the diameter of the quartz wire obtained in step S1. The feeding speed is adjusted according to the drawing speed. The laser power of the laser source module (1) is adjusted according to the feeding speed and the temperature information of the heating area (5) of the quartz rod (6) returned in real time by the spectral detection module (3) obtained in step S3. The temperature of the heating area (5) is stabilized according to the relationship between the laser power of the laser source module (1) and the temperature of the quartz rod (6) obtained in step S1. In step S1, the relationship between the drawing speed of the calculation drawing module and the heating area (5) of the quartz rod (6) is as follows: In the formula, The diameter of the quartz wire, To control the speed, The coefficient for controlling the drawing speed using real-time diameter monitoring results, It is the first constant; The relationship between the laser power of the laser source module (1) and the temperature of the quartz rod (6): In the formula, As a coefficient for temperature-controlled laser power, The temperature of the heating zone (5) For laser power, It is the second constant; In step S4, the feeding speed is calculated from the calculated drawing speed. In the formula, To increase the feeding speed, Let be the radius of the quartz filament. Where is the radius of the quartz rod; The laser power of the laser source module (1) is readjusted based on the calculated feed rate: In time interval Inside, This represents the temperature change of the quartz rod. For the quality of the quartz rod, The density of the quartz rod, Let the radius of the quartz rod be . For laser power, This is the specific heat capacity of the quartz rod.

2. The multi-parameter joint feedback control system for quartz wire drawing according to claim 1, characterized in that, The diameter monitoring module (2) acquires an image of the quartz wire, extracts the pixel positions corresponding to the boundary of the quartz wire from the image, fits the pixel positions, and obtains the diameter information of the quartz wire.

3. A multi-parameter joint feedback control system for quartz wire drawing according to claim 1, characterized in that, The drawing module includes a displacement stage (9), an upper clamp (4) and a lower clamp (8). The upper clamp (4) and the lower clamp (8) clamp the quartz rod (6). The upper clamp (4) is fixedly installed below the displacement stage, and the lower clamp (8) is installed below the quartz rod (6). The upper clamp (4) is pulled out of the quartz rod (6) by moving the displacement stage (9).

4. A multi-parameter joint feedback control system for quartz wire drawing according to claim 3, characterized in that, The process of pulling the quartz wire from the quartz rod (6) by moving the displacement stage (9) is as follows: when the displacement stage (9) moves upward according to the S-shaped acceleration curve to pull the quartz wire from the quartz rod (6), when the displacement stage (9) finishes pulling the quartz wire, the displacement stage (9) moves upward according to the S-shaped deceleration curve to decelerate until it stops, and then moves downward for a preset distance.

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