Mine laneway wind speed measuring system and method based on thermal radiation preheating

Abstract

The invention discloses a mine laneway wind speed measurement system and method based on thermal radiation preheating, and belongs to the field of mine laneway wind speed measurement, the system comprises a sensor probe and a sequential control and processing unit, the sensor probe is provided with an outer layer pulse heating coil and an inner layer constant current temperature measurement coil which are coaxially arranged, and a heat isolation layer allowing heat radiation to pass through and inhibiting heat conduction is arranged between the two. The sequential control and processing unit is used for controlling the heating coil to generate heat radiation in a first time period to preheat the temperature measuring coil, and measuring the resistance change of the temperature measuring coil under the action of pure wind speed to calculate the wind speed after heating is cut off in a following second time period. Through time sequence decoupling operation, thermal inertia coupling is effectively eliminated, the low-wind-speed measurement precision and the dynamic response speed are remarkably improved, and the adaptability and the stability of the system in a high-dust and high-humidity mine environment are enhanced.

Description

Technical Field

[0001] This invention belongs to the field of mine roadway wind speed measurement technology, and particularly relates to a mine roadway wind speed measurement system and method based on thermal radiation preheating. Background Technology

[0002] Real-time and accurate measurement of wind speed in mine roadways is a key technology for ensuring mine ventilation safety and achieving intelligent ventilation control. Currently, underground wind speed measurement mainly relies on ultrasonic technology and traditional thermal anemometers. Regarding ultrasonic technology, for example, Chinese patent CN118777636B discloses a mine roadway wind speed measurement system and method based on the ultrasonic time-of-flight method. This system improves the real-time performance and reliability of wind speed measurement by arranging a horizontally omnidirectional ultrasonic transmitting transducer and two receiving transducers in an isosceles triangle. Another Chinese patent, CN113447671B, discloses a method for detecting wind speed in roadway cross-sections based on high and low frequency ultrasonic waves. This method combines high-frequency and low-frequency ultrasonic transducers and utilizes noise monitoring and weighting compensation techniques to synthesize wind speed data, thereby improving the stability and accuracy of the measurement.

[0003] However, while the aforementioned ultrasonic technology avoids the clogging problems of mechanical instruments, its physical principles dictate inherent limitations in harsh working conditions such as high dust and high humidity, manifesting as limited real-time performance and high system complexity. On the other hand, traditional thermal anemometers, although lacking moving parts and theoretically more suitable for low-speed measurements, generally employ a self-heating, self-temperature-sensing single-coil or functionally coupled design, resulting in significant thermal inertial coupling and thermal conduction interference between the heating and temperature-sensing units. This not only causes slow dynamic response, making it difficult to capture transient wind speed changes caused by gas outbursts, but also exhibits large measurement errors at low wind speeds due to low signal-to-noise ratios. Furthermore, in mining environments, dust adhesion to the coil surface alters its thermal conductivity, forming an insulating layer; simultaneously, high humidity accelerates the electrochemical oxidation of sensitive elements, leading to sensor performance drift or failure.

[0004] The above problems indicate that existing mine roadway wind speed measurement technologies (including ultrasonic and traditional thermal methods) still have significant shortcomings in terms of adaptability to high dust and high humidity environments, measurement accuracy in low wind speed sections, and long-term stability. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a mine roadway wind speed measurement system and method based on thermal radiation preheating, thereby resolving the issues present in the prior art.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a mine roadway wind speed measurement system based on thermal radiation preheating, comprising: Sensor probe, the sensor probe comprising: Ceramic sleeve; An outer pulse heating coil is encapsulated within the ceramic sleeve; and the gap between the outer pulse heating coil and the ceramic sleeve is filled with magnesium oxide insulating material. The inner constant current temperature measuring coil is arranged coaxially with the outer pulse heating coil. A thermal insulation layer is disposed between the ceramic sleeve and the frame of the inner constant current temperature measuring coil to suppress heat conduction between the outer pulse heating coil and the inner constant current temperature measuring coil and allow heat radiation to pass through; A timing control and processing unit is electrically connected to the sensor probe, and the timing control and processing unit includes: A pulse current generating module is electrically connected to the outer pulse heating coil. The constant current measurement module is electrically connected to the inner constant current temperature measuring coil. The signal processing module is electrically connected to the constant current measurement module; The timing control module is electrically connected to the pulse current generation module, the constant current measurement module and the signal processing module respectively, and is used to control the working timing of each module.

[0007] Preferably, the thermal insulation layer is a high-vacuum cavity or a nanoporous thermal insulation material layer.

[0008] Preferably, the outer surface of the ceramic sleeve is coated with a hydrophobic coating.

[0009] Preferably, the timing control module is configured as follows: In the first time period, the pulse current generating module is controlled to apply a pulse current to the outer pulse heating coil so that the outer pulse heating coil preheats the inner constant current temperature measuring coil through thermal radiation; In the second period immediately following the first period, the pulse current generating module is controlled to cut off the power supply to the outer pulse heating coil, and the constant current measurement module is controlled to perform resistance measurement on the inner constant current temperature measuring coil. After the second time period begins, a hardware delay waiting period is set, and then the constant current measurement module 8 is controlled to perform the measurement operation. Based on the resistance change data collected by the constant current measurement module during the second time period, the current wind speed value is calculated by the signal processing module.

[0010] Preferably, the wind speed calculation program executed by the signal processing module is based on the following function model: ; in For wind speed, This is the change in resistance. , , These are the coefficients calibrated in the experiment.

[0011] Preferably, the timing control module is further configured to: Based on the calculated wind speed change, the pulse current width of the first time period in subsequent measurement cycles is dynamically adjusted, wherein the adjustment of the pulse current width follows the formula: in The pulse current width, This represents the change in wind speed. , These are constants calibrated experimentally.

[0012] Preferably, the system further includes: The venturi tubular housing has a throat that matches the outer diameter of the sensor probe. A dust filter is disposed at the inlet end of the venturi tubular shell.

[0013] Preferably, a guide vane is provided at the outlet end of the venturi tubular shell.

[0014] Preferably, the system further includes: A data transmission module, connected to the signal processing module, is used to transmit wind speed values ​​to a remote monitoring system; The power management module is used to supply power to the pulse current generation module, the constant current measurement module and the signal processing module.

[0015] Secondly, the present invention also provides a method for measuring wind speed in mine roadways based on thermal radiation preheating, using the system described in the first aspect, the method comprising the following steps: In the first time period, a pulse current is applied to the outer pulse heating coil through the pulse current generation module, so that the inner constant current temperature measuring coil is preheated through thermal radiation; In the second time period, the power supply to the outer pulse heating coil is cut off; During the second time period, the resistance change of the inner constant current temperature sensing coil is measured by the constant current measurement module; Based on the change in resistance, the current wind speed value is calculated by the signal processing module.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects: This invention employs a physically separated "outer layer pulse heating coil" and "inner layer constant current temperature measuring coil," with a "timing control module" executing a decoupled timing operation process of "preheating first, then power-off measurement." In the first time period, only the inner coil is preheated by thermal radiation; in the second time period, the heating power is completely cut off before temperature measurement is performed solely based on wind speed. This design ensures that during the core measurement period, the temperature change of the sensing element is almost entirely determined by the wind speed flowing over its surface, effectively eliminating thermal conduction interference and signal aliasing caused by the heating process. This significantly improves the system's dynamic response speed, accurately capturing transient wind speed changes, and greatly enhancing measurement accuracy and signal-to-noise ratio in low-wind-speed ranges.

[0017] In this invention, the outer pulse heating coil is encapsulated within a ceramic sleeve, and a thermal insulation layer is provided between it and the inner coil. This structure reduces the risk of the sensitive temperature sensing element being directly exposed to a contaminated environment. More importantly, the time-decoupled operating mode reduces the dependence on the cleanliness of the coil surface, because the critical measurement is performed after heating has stopped, weakening the impact of the thermal insulation effect formed by surface deposits under continuous heating on the measurement results. This makes the system more stable in high-dust environments. Simultaneously, this solid-state encapsulation structure itself provides a better physical basis for coping with high-humidity environments.

[0018] This invention employs an all-solid-state sensor probe design with no moving mechanical parts, resulting in a robust and durable structure. The described timing decoupling measurement method features a clear process and well-defined control logic, eliminating the need for complex acoustic path calibration or frequent on-site calibration. This reduces the risk of system failure due to mechanical faults or calibration drift, simplifies installation and subsequent maintenance procedures, and facilitates long-term reliable unattended operation in complex mining environments. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall system layout according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the sensor arrangement according to an embodiment of the present invention; Figure 3 This is a step diagram of a method for measuring wind speed in mine roadways based on thermal radiation preheating, according to an embodiment of the present invention. The components include: 1. Outer pulse heating coil; 2. Inner constant current temperature measuring coil; 3. Thermal insulation layer; 4. Mine roadway airflow; 5. Ceramic sleeve; 6. Pulse current generating module; 7. First signal cable; 8. Constant current measurement module; 9. Second signal cable; 10. Signal processing module; 11. Timing control module; 12. Third signal cable; 13. Venturi tubular shell; 14. Dust filter; 15. Guide plate; 16. Fourth signal cable; 17. Data transmission module; 18. Fifth signal cable; 19. Power management module; 20. Sixth signal cable; 21. Hydrophobic coating; 22. Magnesium oxide powder; 23. Roadway dust; 24. Mine roadway; 25. Sensor probe; 26. LCD display screen; 27. Ceramic skeleton. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0022] Example 1 like Figure 1 As shown, this embodiment provides a mine roadway wind speed measurement system based on thermal radiation preheating. The system includes a sensor probe 25, a Venturi tubular housing 13, a dust filter 14, and a guide vane 15. The sensor probe 25 is located at the center of the throat of the Venturi tubular housing 13 and is fixed inside the housing via a threaded connection. The dust filter 14 is installed at the inlet end of the Venturi tubular housing 13 and is detachably connected via a snap-fit ​​structure. Its aperture is 0.5±0.1mm, used to block large dust particles from entering the system. The guide vane 15 is located at the outlet end of the Venturi tubular housing 13, with an inclination angle of 45°±5°, and is fixed to the outlet end of the housing via welding. It guides the airflow to flow smoothly out and reduces the impact of turbulence on the measurement. Furthermore, this system is installed inside the mine roadway 24, where the mine roadway airflow 4 blows the roadway dust 23 from one direction to another.

[0023] In practical applications, this system is installed at key locations in mine roadways 24, such as near ventilation openings or roadway intersections, to monitor wind speed changes in real time. When airflow passes through the Venturi tubular housing 13, the dust filter 14 first blocks large dust particles from entering the system, preventing dust adhesion from affecting measurement accuracy. Subsequently, the airflow passes through the throat of the Venturi tubular housing 13. Due to the small diameter of the throat, the airflow speed increases, forming a stable high-speed airflow, thereby improving measurement accuracy. The guide vane 15 guides the airflow out smoothly, reducing the impact of turbulence on the measurement. The sensor probe 25, through its thermal radiation preheating and time-series decoupling design, solves the problem of coupling heating and temperature measurement functions in traditional thermal sensors, significantly improving the system's dynamic response speed and measurement accuracy. In low wind speed ranges, the system achieves high-sensitivity measurement through dynamic pulse width optimization, ensuring long-term stability in complex mine environments.

[0024] The system specifically includes: Sensor probe, the sensor probe comprising: Ceramic sleeve; Furthermore, the outer surface of the ceramic sleeve is coated with a hydrophobic coating.

[0025] Specifically, the outer surface of the ceramic sleeve 5 is coated with a hydrophobic coating with a thickness of 0.1±0.02mm. The hydrophobic coating is bonded to the surface of the ceramic sleeve 5 by chemical bonding to reduce the influence of water vapor adsorption in a high humidity environment.

[0026] The outer pulse heating coil is encapsulated within the ceramic sleeve; Specifically, the outer pulse heating coil 1 is made of a stainless steel tube with an outer diameter of 0.8±0.1mm, wound and encapsulated within a ceramic sleeve 5. The gap between the coil and the ceramic sleeve 5 is filled with magnesium oxide insulating material. The ceramic sleeve 5 has a wall thickness of 0.5±0.1mm. The stainless steel tube of the outer pulse heating coil 1 is wound in a spiral shape with a winding spacing of 2.0±0.3mm and 10±2 turns.

[0027] The inner constant current temperature measuring coil is arranged coaxially with the outer pulse heating coil. Specifically, the inner constant current temperature measuring coil 2 is made of platinum wire with a diameter of 0.15±0.02mm wound on a ceramic skeleton, and its axis is arranged coaxially with the outer pulse heating coil 1. The platinum wire of the inner constant current temperature measuring coil 2 is wound in a single layer with a tight pitch of 1.5±0.2mm.

[0028] A thermal insulation layer is disposed between the ceramic sleeve and the frame of the inner constant current temperature measuring coil to suppress heat conduction between the outer pulse heating coil and the inner constant current temperature measuring coil and allow heat radiation to pass through; Furthermore, the thermal insulation layer is a high-vacuum cavity or a nanoporous thermal insulation material layer.

[0029] Specifically, the thermal insulation layer 3 is a high-vacuum cavity or a nanoporous thermal insulation material layer filled between the ceramic sleeve 5 and the ceramic skeleton, and the radial thickness of the thermal insulation layer 3 is 2.0 ± 0.5 mm. The thermal insulation layer 3 is configured to significantly suppress heat conduction between the outer pulse heating coil 1 and the inner constant current temperature measuring coil 2, while allowing heat radiation to pass through effectively to preheat the inner constant current temperature measuring coil 2.

[0030] like Figure 2 As shown, the sensor probe 25 consists of a ceramic sleeve 5, an outer pulse heating coil 1, an inner constant current temperature measuring coil 2, and a thermal insulation layer 3. The ceramic sleeve 5 has a cylindrical structure with a wall thickness of 0.5±0.1mm. Its outer surface is coated with a hydrophobic coating 21 with a thickness of 0.1±0.02mm. The hydrophobic coating 21 is chemically bonded to the surface of the ceramic sleeve 5 to reduce the influence of humidity on the measurement. The outer pulse heating coil 1 is made of stainless steel tubing with an outer diameter of 0.8±0.1mm, a winding spacing of 2.0±0.3mm, and 10±2 turns. It is encapsulated inside the ceramic sleeve 5, and the gap between it and the ceramic sleeve 5 is filled with magnesium oxide powder 22 as insulating material to ensure electrical insulation performance. The inner constant current temperature measuring coil 2 is made of platinum wire with a diameter of 0.15±0.02mm wound on a ceramic frame 27. The winding pitch is 1.5±0.2mm and the winding length is 15±2mm. Its axis is arranged coaxially with the outer pulse heating coil 1 to ensure that the heat radiation can be uniformly applied to the inner constant current temperature measuring coil 2. The thermal insulation layer 3 is disposed between the ceramic sleeve 5 and the ceramic frame 27. It is a high vacuum cavity or a nanoporous thermal insulation material layer with a radial thickness of 2.0±0.5mm. It is used to suppress the heat conduction between the outer pulse heating coil 1 and the inner constant current temperature measuring coil 2, while allowing heat radiation to pass through to achieve the preheating function.

[0031] Specifically, the sensor probe is configured such that, during measurement, the mine roadway airflow 4 simultaneously flows through the common flow field of the outer pulse heating coil 1 and the inner constant current temperature measuring coil 2. The timing control module 11 performs the measurement in the following manner: In the first time period, the heat radiation released by the instantaneous high temperature generated by the outer pulse heating coil 1 serves as the dominant heat source to preheat the inner constant current temperature measuring coil 2 to a preset initial temperature; in the immediately following second time period, after the heating is cut off, the inner constant current temperature measuring coil 2 is exposed to the roadway airflow that has not been additionally heated, and its temperature change is mainly determined by the wind speed flowing over its surface, based on which the wind speed value is calculated.

[0032] A timing control and processing unit is electrically connected to the sensor probe, and the timing control and processing unit includes: A pulse current generating module is electrically connected to the outer pulse heating coil. Specifically, the pulse current generating module 6 is electrically connected to the outer pulse heating coil 1 via the first signal cable 7, and is used to apply pulse current to the outer pulse heating coil 1.

[0033] The constant current measurement module is electrically connected to the inner constant current temperature measuring coil. Specifically, the constant current measurement module 8 is electrically connected to the inner constant current temperature measuring coil 2 via the second signal cable 9, and is used to apply a constant measuring current to the inner constant current temperature measuring coil 2 and collect its resistance value change data.

[0034] The signal processing module is electrically connected to the constant current measurement module; Specifically, the signal processing module 10 is electrically connected to the constant current measurement module 8 and is used to receive and process the resistance value change data.

[0035] The timing control module is electrically connected to the pulse current generation module, the constant current measurement module, and the signal processing module, respectively. Specifically, the timing control module 11 is electrically connected to the pulse current generation module 6, the constant current measurement module 8 and the signal processing module 10, respectively, and is used to control the working timing of each module.

[0036] In this embodiment, the timing control and processing unit includes a pulse current generation module 6, a constant current measurement module 8, a signal processing module 10, and a timing control module 11. The pulse current generation module 6 is electrically connected to the outer pulse heating coil 1 via a first signal cable 7 to apply a pulse current. The constant current measurement module 8 is electrically connected to the inner constant current temperature measuring coil 2 via a second signal cable 9 to apply a constant measurement current and collect resistance value change data. The signal processing module 10 is electrically connected to the constant current measurement module 8 to receive and process the resistance value change data. The timing control module 11 is electrically connected to the pulse current generation module 6, the constant current measurement module 8, and the signal processing module 10 respectively to control the working timing of each module. The first signal cable 7 and the second signal cable 9 are physically isolated from each other to reduce signal interference. A third signal cable 12 is provided between the timing control module 11 and the signal processing module 10 for transmitting timing control signals and wind speed calculation results.

[0037] The system operates as follows: In the first time period, the timing control module 11 sends a command to the pulse current generation module 6 via the third signal cable 12. The pulse current generation module 6 applies a pulse current to the outer pulse heating coil 1, causing it to heat up rapidly. This primarily preheats the inner constant current temperature measuring coil 2 through thermal radiation, bringing it to a preset initial temperature. In the second time period immediately following the first, the timing control module 11 sends a cut-off command to the pulse current generation module 6 via the third signal cable 12, causing the pulse current generation module 6 to cut off the power supply to the outer pulse heating coil 1. After the second time period begins, the timing control module 11 sets a hardware delay of 0.1-0.5ms to ensure the thermal field stabilizes before executing subsequent operations. During the second time period, the constant current measurement module 8 applies a constant measuring current to the inner constant current temperature measuring coil 2 and collects its resistance value change data through the signal processing module 10. Based on the resistance value change data collected during the second time period, the signal processing module 10 executes the wind speed calculation program to directly calculate the current wind speed value in the tunnel. The wind speed calculation program is based on the following function model: ,in For wind speed, , For the temperature sensing coil at temperature The resistance value at that time, The resistance value at 0℃ , , These are the coefficients calibrated experimentally.

[0038] Specifically, the signal processing module 10 transmits the calculated wind speed value to the display unit via the fourth signal cable 16. The display unit includes an LCD display screen 26 and LED indicator lights, which are used to display the wind speed value and system operating status in real time.

[0039] After completing one measurement cycle, based on the calculated wind speed change Δv (in m / s), the timing control module 11 dynamically optimizes the pulse current width t_pulse for the first time period in the next measurement cycle. The timing control module 11 sends the optimized pulse width parameters to the pulse current generation module 6 via the third signal cable 12. The pulse current generation module 6 adjusts the pulse current width according to the received parameters, achieving dynamic optimization of the measurement parameters. The adjustment follows the formula: t_pulse = KC × Δv, where t_pulse is in milliseconds (ms), Δv is the difference between the wind speed value v measured in the current cycle and the wind speed value calculated in the previous measurement cycle (in m / s), and K and C are experimentally calibrated constants.

[0040] The system also includes a data transmission module 17 and a power management module 19. The data transmission module 17 is connected to the signal processing module 10 via a fifth signal cable 18, and is used to transmit the measured wind speed value to the remote monitoring system. It supports RS485 and CAN bus communication protocols, with a transmission distance of up to 1000 meters and a transmission rate of up to 1Mbps. The power management module 19 is connected to the pulse current generation module 6, the constant current measurement module 8, and the signal processing module 10 via a sixth signal cable 20, and is used to provide stable operating voltage and current. The power management module 19 includes overvoltage protection circuits and overcurrent protection circuits to ensure the safe operation of the system in the harsh environment of a mine.

[0041] The beneficial effects of this embodiment: This embodiment, through its unique "timing decoupling" working mode (heating and preheating before measurement) and "physical separation" probe structure (independent inner and outer coils with a thermal isolation layer in between), completely breaks through the signal aliasing and technical bottlenecks caused by the "simultaneous heating and measurement" of traditional thermal sensors. This results in an extremely fast dynamic response speed, enabling precise capture of transient wind speed changes caused by gas outbursts, etc. Simultaneously, in low wind speed ranges, the measurement accuracy is revolutionaryly improved due to the purity of the measurement signal and high signal-to-noise ratio. This embodiment fundamentally solves the problem of thermal inertial coupling, achieving high precision and rapid response.

[0042] This embodiment incorporates multiple specialized designs for high-dust, high-humidity environments: First, the hydrophobic coating on the outer ceramic sleeve effectively inhibits moisture adsorption, preventing electrochemical oxidation and performance drift. Second, the combination of the venturi tube shell and the dust filter effectively intercepts large dust particles while accelerating the rectified airflow, preventing them from adhering to the surface of the sensitive element and forming a heat insulation layer. Furthermore, the core "timing decoupling" principle itself reduces sensitivity to the cleanliness of the coil surface. These designs collectively ensure the reliability and stability of the sensor during long-term operation in harsh environments. The technical solution of this embodiment exhibits extremely strong environmental adaptability and long-term stability, making it particularly suitable for harsh working conditions in mines.

[0043] This embodiment can dynamically adjust the heating pulse width for the next cycle based on the real-time calculated wind speed. This adaptive control strategy enables rapid response and energy saving in high-speed winds, while ensuring sufficient preheating in low-speed winds. Thus, without sacrificing accuracy, it achieves a wider wind speed measurement range and optimizes overall energy consumption. It possesses intelligent dynamic optimization capabilities, expanding the measurement range and improving energy efficiency.

[0044] The sensor probe in this embodiment adopts an all-solid-state design with no moving parts, resulting in a stable and durable mechanical structure. The venturi tube housing and filter screen are detachably connected via threads and snap-fit ​​mechanisms, facilitating quick cleaning and replacement and significantly reducing maintenance costs and operational complexity. Furthermore, this embodiment avoids the complex acoustic path calibration and frequent adjustments required by ultrasonic technology, simplifying installation and maintenance. The system in this embodiment boasts a robust structure, easy maintenance, and low overall cost.

[0045] In summary, this embodiment, through innovative breakthroughs in principle and targeted structural design, successfully overcomes the main shortcomings of existing ultrasonic and traditional thermal anemometers in mine applications, providing a high-precision, fast-response, environmentally adaptable, and easy-to-maintain anemometer measurement solution, thus offering more reliable technical support for intelligent ventilation and mine safety.

[0046] Example 2 like Figure 3 As shown, this embodiment provides a method for measuring wind speed in mine roadways based on thermal radiation preheating, using the system described in Embodiment 1. The method includes the following steps: S1. In the first time period, a pulse current is applied to the outer pulse heating coil through the pulse current generation module, so that the inner constant current temperature measuring coil is preheated by thermal radiation. S2. In the second time period, the power supply to the outer pulse heating coil is cut off; S3. During the second time period, the resistance change of the inner constant current temperature sensing coil is measured by the constant current measurement module; S4. Based on the resistance change, the current wind speed value is calculated by the signal processing module.

[0047] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A mine roadway wind speed measurement system based on thermal radiation preheating, characterized in that, include: Sensor probe (25), the sensor probe (25) comprising: Ceramic sleeve (5); The outer pulse heating coil (1) is encapsulated inside the ceramic sleeve (5); and the gap between it and the ceramic sleeve (5) is filled with magnesium oxide insulating material. The inner constant current temperature measuring coil (2) is arranged coaxially with the outer pulse heating coil (1); A thermal insulation layer (3) is disposed between the ceramic sleeve (5) and the inner constant current temperature measuring coil (2) to suppress heat conduction between the outer pulse heating coil (1) and the inner constant current temperature measuring coil (2) and allow heat radiation to pass through. The timing control and processing unit is electrically connected to the sensor probe (25), and the timing control and processing unit includes: The pulse current generating module (6) is electrically connected to the outer pulse heating coil (1); The constant current measurement module (8) is electrically connected to the inner constant current temperature measuring coil (2); The signal processing module (10) is electrically connected to the constant current measurement module (8); The timing control module (11) is electrically connected to the pulse current generation module (6), the constant current measurement module (8) and the signal processing module (10) respectively, and is used to control the working timing of each module.

2. The system according to claim 1, characterized in that, The thermal insulation layer (3) is a high vacuum cavity or a nanoporous thermal insulation material layer.

3. The system according to claim 1, characterized in that, The outer surface of the ceramic sleeve (5) is coated with a hydrophobic coating.

4. The system according to claim 1, characterized in that, The timing control module (11) is configured as follows: During the first time period, the pulse current generating module (6) is controlled to apply a pulse current to the outer pulse heating coil (1) so that the outer pulse heating coil (1) heats up rapidly and preheats the inner constant current temperature measuring coil (2) through thermal radiation; In the second period immediately following the first period, the pulse current generating module (6) is controlled to cut off the power supply to the outer pulse heating coil (1), and the constant current measuring module (8) is controlled to apply a constant measuring current to the inner constant current temperature measuring coil (2) and perform resistance measurement. After the second time period begins, a hardware delay waiting period is set, and then the constant current measurement module (8) is controlled to perform the measurement operation; Based on the resistance value change data collected by the constant current measurement module (8) during the second time period, the current wind speed value is calculated by the signal processing module (10).

5. The system according to claim 1, characterized in that, The wind speed calculation program executed by the signal processing module (10) is based on the following function model: ； in For wind speed, This is the change in resistance. , , These are the coefficients calibrated in the experiment.

6. The system according to claim 1, characterized in that, The timing control module (11) is also configured to: Based on the calculated wind speed change, the pulse current width of the first time period in subsequent measurement cycles is dynamically adjusted, wherein the adjustment of the pulse current width follows the formula: ； in The pulse current width, This represents the change in wind speed. , These are constants calibrated experimentally.

7. The system according to claim 1, characterized in that, Also includes: The venturi tubular housing (13) has a throat that matches the outer diameter of the sensor probe (25); A dust filter (14) is disposed at the inlet end of the venturi tubular shell (13).

8. The system according to claim 7, characterized in that, The outlet end of the Venturi tubular shell (13) is provided with a guide vane (15).

9. The system according to claim 1, characterized in that, Also includes: The data transmission module (17) is connected to the signal processing module (10) and is used to transmit the wind speed value to the remote monitoring system; The power management module (19) is used to supply power to the pulse current generation module (6), the constant current measurement module (8) and the signal processing module (10).

10. A method for measuring wind speed in mine roadways based on thermal radiation preheating, characterized in that, The method using the system as described in any one of claims 1-9 includes the following steps: In the first time period, a pulse current is applied to the outer pulse heating coil (1) through the pulse current generating module (6), so that the inner constant current temperature measuring coil (2) is preheated by thermal radiation; During the second time period, the power supply to the outer pulse heating coil (1) is cut off; During the second time period, the resistance change of the inner constant current temperature measuring coil (2) is measured by the constant current measurement module (8); Based on the resistance change, the current wind speed value is calculated by the signal processing module (10).

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