Sensor probe and fiber bragg grating wind speed sensor

Abstract

The invention provides a sensor probe and a fiber grating wind speed sensor, and relates to the technical field of wind speed sensors. The sensor probe comprises a diversion trench; the flow guide groove is of a single-rotation-direction asymmetric spiral structure; the surface of the diversion trench is sequentially covered with a first coating, a second coating and a third coating from outside to inside; the first coating is a multi-gradient coating and is used for filtering dust in a grading manner, the second coating is used for preventing water, and the third coating is used for decomposing dust. According to the sensor probe, by adopting the flow guide groove with the single-rotation-direction asymmetric spiral structure, dust particles can be thrown to the outer edge of a channel by utilizing centrifugal force generated by the asymmetric spiral structure, and airflow passing ability is kept. The surface of the diversion trench is covered with three coatings, dust filtration and water prevention can be achieved on the physical level, dust decomposition can be achieved on the chemical level, physical and chemical dual dust prevention can be achieved, the influence of air humidity and dust concentration on the detection result of the sensor probe is reduced, and the measurement precision and stability of the fiber grating wind speed sensor are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of wind speed sensors, and in particular to a sensor probe and a fiber Bragg grating wind speed sensor. Background Art

[0002] Toxic and flammable gases are present underground in coal mines, posing operational risks such as poisoning and explosions. Therefore, maintaining ventilation is a prerequisite for safe production, necessitating wind speed monitoring in mine operations. Existing wind speed sensors, including mechanical, thermal, ultrasonic, and pressure sensors, all directly or indirectly convert wind speed from electrical signals, posing safety risks when used underground.

[0003] Mechanical wind speed sensors measure wind speed by the force exerted by wind on mechanical components, but they have a starting wind speed limit, are unsuitable for low wind speed measurements, and are significantly affected by the environment. Thermal wind speed sensors calculate wind speed by measuring the heat loss of a heating element in the airflow, but there are many interference factors in the fluid dynamics of underground wells, and the hot wire is easily damaged. Ultrasonic wind speed sensors calculate wind speed by measuring the time difference between ultrasonic waves propagating through the air, but they have strict requirements on the installation position and angle. Pressure wind speed sensors calculate wind speed by measuring the difference between the dynamic and static pressures of the airflow, but are insensitive to low wind speeds and easily clogged by dust and particulate matter. Fiber Bragg grating wind speed sensors, on the other hand, use optical signal transmission, are not affected by electromagnetic fields, and have the advantages of high sensitivity and corrosion resistance.

[0004] However, in the actual production process of mines, environmental factors such as high air humidity and high dust concentration will cause errors in the detection results of the sensor probe, affecting the normal operation of the fiber grating wind speed sensor, resulting in low measurement accuracy and poor stability. Summary of the Invention

[0005] To solve the above problems, the present application provides a sensor probe and a fiber grating wind speed sensor, which can solve the technical problems of low measurement accuracy and poor stability of wind speed sensors.

[0006] The first aspect of the present application provides a sensor probe, comprising: a guide groove; the guide groove is a unidirectional asymmetric spiral structure; the surface of the guide groove is covered with a first coating, a second coating and a third coating in sequence from the outside to the inside; the first coating is a multi-gradient coating for graded dust filtration, the second coating is for waterproofing, and the third coating is for decomposing dust.

[0007] The sensor probe utilizes a unidirectional asymmetric spiral structured flow channel, which utilizes the centrifugal force generated by the asymmetric spiral structure to fling dust particles to the outer edge of the channel while maintaining airflow. The flow channel is coated with three types of coatings, which physically filter and repel dust, and chemically decompose it, achieving both physical and chemical dust protection. This reduces the impact of air humidity and dust concentration on the sensor probe's detection results, improving the measurement accuracy and stability of the fiber Bragg grating wind speed sensor.

[0008] In one possible implementation of the first aspect, the guide groove is a unidirectional asymmetric spiral structure, including: the pitch of the guide groove gradually decreases from the entrance to the exit; the groove depth of the guide groove gradually increases from the entrance to the exit; the width of the guide groove gradually decreases from the outside to the inside; the angle between the groove of the guide groove and the axis gradually increases from the entrance to the exit.

[0009] In an implementation method of the first aspect, the pitch at the inlet of the guide groove is 10 mm, and the pitch at the outlet of the guide groove is 5 mm; the groove depth at the inlet of the guide groove is 0.5 mm, and the groove depth at the outlet of the guide groove is 1.5 mm; the width of the outer side of the guide groove is 1.2 mm, and the width of the inner side of the guide groove is 0.8 mm; the angle between the groove at the inlet of the guide groove and the axis is 15°, and the angle between the groove at the outlet of the guide groove and the axis is 45°.

[0010] The sensor probe's guide grooves feature a gradual design for pitch, depth, width, and angle between the groove and the axis. The pitch decreases gradually from the inlet to the outlet, enhancing centrifugal force, compressing the airflow and reducing initial flow resistance to improve dust separation efficiency. The groove depth increases gradually from the inlet to the outlet, accelerating airflow rotation. The groove width decreases gradually from the outside to the inside, guiding dust outward, with the narrow inner grooves maintaining the core airflow velocity and the wide outer grooves capturing dust. The groove-axis angle increases gradually from the inlet to the outlet, gradually enhancing the centrifugal effect.

[0011] In one implementation of the first aspect, the first coating is a porous coating, including an outer layer, a middle layer and an inner layer; the outer layer has a pore size of 10um, which is used to filter coarse dust particles; the middle layer has a pore size of 5um, which is used to filter medium dust particles; and the inner layer has a pore size of 1um, which is used to filter fine dust particles.

[0012] The first coating covering the guide groove of the above-mentioned sensor probe is a three-layer porous coating, which can filter coarse dust particles, medium dust particles and fine dust particles in a graded manner, slow down the clogging speed and extend the service life of the coating.

[0013] In an implementation of the first aspect, the porosity of the first coating layer is greater than 40%.

[0014] The porosity of the first coating covering the guide groove of the above-mentioned sensor probe is greater than 40%, which can ensure the permeability of airflow, reduce the probability of dust adhering to the surface of the sensor probe, and improve the performance of the fiber Bragg grating wind speed sensor.

[0015] In an implementation of the first aspect, the first coating is a porous ceramic coating; the second coating is a hydrophobic material coating; and the third coating is a nanocoating with thermal conductivity.

[0016] In one implementation of the first aspect, the first coating is a porous alumina ceramic coating; the second coating is a fluorosilane coating; and the third coating is a titanium dioxide graphene nanocoating.

[0017] In an implementation of the first aspect, the thickness of the first coating layer is 100 nm; and the contact angle between the second coating layer and water is greater than 150°.

[0018] The first coating covering the guide groove of the above-mentioned sensor probe adopts a porous alumina ceramic coating with a thickness of 100nm, which can improve the service life of the coating. The second coating is a fluorosilane coating with hydrophobic properties, which can play a waterproof role. The third coating is a titanium dioxide graphene nanocoating with thermal conductivity, which can decompose organic dust under photocatalysis and reduce the impact of air humidity and dust concentration on the sensor probe.

[0019] A second aspect of the present application provides a fiber Bragg grating wind speed sensor, comprising the sensor probe provided by the first aspect and any possible implementation thereof, and a fiber Bragg grating; the fiber Bragg grating is disposed inside a guide groove of the sensor probe.

[0020] In one implementation of the second aspect, the fiber Bragg grating wind speed sensor further includes: a pump source, an optical cable, and a fiber Bragg grating demodulator; the top end of the sensor probe is connected to the pump source, and the bottom end of the sensor probe is connected to the optical cable; and the fiber Bragg grating is connected to the fiber Bragg grating demodulator.

[0021] The fiber Bragg grating wind speed sensor is configured to be located inside the flow guide groove of the sensor probe, thereby reducing the impact of external dust and moisture on the measurement accuracy of the fiber Bragg grating and improving the measurement accuracy and stability of the fiber Bragg grating wind speed sensor.

[0022] As can be seen from the above technical solution, this application provides a sensor probe and fiber Bragg grating wind speed sensor. The sensor probe includes a flow guide groove; the flow guide groove is a unidirectional asymmetric spiral structure; the flow guide groove surface is sequentially coated with a first coating, a second coating, and a third coating from the outside to the inside; the first coating is a multi-gradient coating for graded dust filtration, the second coating is waterproof, and the third coating is for decomposing dust.

[0023] The sensor probe utilizes a unidirectional asymmetric spiral structured flow channel, which utilizes the centrifugal force generated by the asymmetric spiral structure to fling dust particles to the outer edge of the channel while maintaining airflow. The flow channel is coated with three types of coatings, which physically filter and repel dust, and chemically decompose it, achieving both physical and chemical dust protection. This reduces the impact of air humidity and dust concentration on the sensor probe's detection results, improving the measurement accuracy and stability of the fiber Bragg grating wind speed sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a schematic structural diagram of a sensor probe provided in an embodiment of the present application; Figure 2 This is a flow chart of a method for detecting wind speed using a fiber Bragg grating wind speed sensor provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a fiber Bragg grating wind speed sensor provided in an embodiment of the present application.

[0026] Graphic mark: 1- diversion trough; 101- entrance; 102- exit; 201- top; 202- bottom; 301-sensor probe; 302-pump source; 303-optical cable; 304-fiber Bragg grating demodulator. DETAILED DESCRIPTION

[0027] The following embodiments are described in detail, with examples shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following embodiments are not intended to represent all embodiments consistent with this application.

[0028] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0029] In this specification and the accompanying drawings, the terms "first," "second," "third," etc. are used to distinguish similar or similar objects or entities, and are not necessarily intended to limit a particular order or precedence, unless otherwise noted. It should be understood that the terms used in this manner are interchangeable under appropriate circumstances.

[0030] To facilitate understanding of the solution, the following explains the relevant terms: Fiber Bragg Grating (FBG): A passive optical device with a periodic refractive index modulation structure formed within the core of an optical fiber through techniques such as ultraviolet light exposure. Its core characteristic is the periodic variation of the core's refractive index along the fiber's axis. This periodic structure selectively affects specific wavelengths of light. When light is transmitted through the fiber, light that meets the Bragg condition (i.e., the matching relationship between the wavelength and the refractive index period) is strongly reflected, while light of other wavelengths is smoothly transmitted.

[0031] Fiber Bragg Grating (FBG) wind speed sensor: An optical sensing device that uses a fiber Bragg grating (FBG) as its core sensitive element and is used to measure airflow velocity (wind speed). Its core principle is to leverage the fiber Bragg grating's sensitivity to physical deformation to convert the mechanical effect of wind on the sensor into a detectable optical signal, thereby achieving quantitative wind speed measurement.

[0032] Guide groove: The core function of the guide groove in the fiber Bragg grating wind speed sensor is to guide, rectify or focus the airflow so that the wind speed signal can be transmitted more stably and accurately to the sensitive components coupled with the fiber Bragg grating, thereby improving the measurement accuracy and reliability of the sensor.

[0033] Fiber Bragg grating wind speed sensors are based on optical signal transmission, are not affected by electromagnetic fields, have the advantages of high sensitivity and corrosion resistance, and are widely used in the field of wind speed detection in mines.

[0034] However, when using fiber Bragg grating wind speed sensors for wind speed detection, water vapor and dust in the air underground in the mine adhere to the sensor probe, which may cause blockage on the sensor probe surface and reduce the detection accuracy of the sensor probe, affecting the normal operation of the fiber Bragg grating wind speed sensor, resulting in low measurement accuracy and poor stability.

[0035] In order to solve the above technical problems, the embodiment of the present application provides a sensor probe 301, which can reduce the impact of dust and water vapor on wind speed detection accuracy and solve the technical problems of low measurement accuracy and poor stability of fiber Bragg grating wind speed sensors.

[0036] Figure 1 This is a schematic structural diagram of a sensor probe provided in an embodiment of the present application.

[0037] Combine Figure 1 As shown, the sensor probe 301 provided in the embodiment of the present application includes: a guide groove 1; the guide groove 1 is a unidirectional asymmetric spiral structure; the surface of the guide groove 1 is covered with a first coating, a second coating and a third coating from the outside to the inside; the first coating is a multi-gradient coating for graded dust filtration, the second coating is used for waterproofing, and the third coating is used for decomposing dust.

[0038] In some embodiments, airflow in a symmetrical flow field tends to flow smoothly along a "uniform path" (e.g., laminar flow in a symmetrical pipe), resulting in minimal disturbance and dispersed effects. To disrupt the naturally "symmetrical and smooth" flow field, the guide groove 1 employs a unidirectional, asymmetric spiral structure, forcing the airflow to follow a spiral path. Furthermore, to enhance the sensitivity of the sensor probe 301 in wind speed detection, it is necessary to enhance local eddies. This unidirectional, asymmetric spiral structure forces the airflow to twist and compress, creating an asymmetric pressure distribution and flow direction. This disrupts the originally uniform flow field, thereby enhancing local eddies.

[0039] Furthermore, the unidirectional asymmetric spiral structure of the guide groove 1 has a diversion characteristic. The centrifugal force generated by the asymmetric spiral structure is used to fling dust particles to the outer edge of the channel while maintaining airflow. This can reduce impurity accumulation, improve the detection accuracy of the sensor probe 301, and increase the durability of the sensor.

[0040] For example, Figure 1 The exterior of the sensor probe 301 is designed to resemble a shark gill structure. Using 3D printing or micromachining technology, a single-direction asymmetric spiral structure guide groove 1 (similar to a turbine blade) is designed on the exterior of the sensor probe 301. The principle of fluid dynamics is used to discharge dust particles in a tangential direction under the action of centrifugal force, thereby reducing dust deposition.

[0041] In one implementation, the unidirectional asymmetric spiral structure of the guide groove 1 includes: the pitch of the guide groove 1 gradually decreases from the entrance 101 to the exit 102; the groove depth of the guide groove 1 gradually increases from the entrance 101 to the exit 102; the width of the guide groove 1 gradually decreases from the outside to the inside; the angle between the groove of the guide groove 1 and the axis gradually increases from the entrance 101 to the exit 102.

[0042] Among them, the pitch gradually decreases from the inlet 101 to the outlet 102, which can enhance the centrifugal force, gradually compress the airflow, reduce the initial flow resistance, and improve the separation efficiency of the dust; the groove depth gradually increases from the inlet 101 to the outlet 102, which can accelerate the rotation of the airflow; the groove width gradually decreases from the outside to the inside, which can guide the dust to move outward, and the core airflow velocity is maintained by the narrow groove on the inside, and the dust is captured by the wide groove on the outside; the groove-axis angle gradually increases from the inlet 101 to the outlet 102, which can gradually enhance the centrifugal effect.

[0043] For example, Figure 1As shown, the pitch of the guide groove 1 at the inlet 101 is 10 mm, the pitch of the guide groove 1 at the outlet 102 is 5 mm, and the pitch of the guide groove 1 gradually decreases from 10 mm to 5 mm from the inlet 101 to the outlet 102; the groove depth of the guide groove 1 at the inlet 101 is 0.5 mm, the groove depth of the guide groove 1 at the outlet 102 is 1.5 mm, and the groove depth of the guide groove 1 gradually increases from 0.5 mm to 1.5 mm from the inlet 101 to the outlet 102 m; the width of the outer side of the guide groove 1 is 1.2 mm, the width of the inner side of the guide groove 1 is 0.8 mm, and the width of the guide groove 1 from the outer side to the inner side gradually decreases from 1.2 mm to 0.8 mm; the angle between the groove at the inlet 101 of the guide groove 1 and the axis is 15°, the angle between the groove at the outlet 102 of the guide groove 1 and the axis is 45°, and the angle between the groove and the axis from the inlet 101 to the outlet 102 of the guide groove 1 gradually increases from 15° to 45°.

[0044] In some embodiments, the environment underground in a mine is characterized by high humidity and dust concentration. Therefore, to prevent moisture and dust particles in the air from adhering to the sensor probe 301 and affecting detection accuracy, the surface of the guide trough 1 is coated with a first coating, a second coating, and a third coating. This physically filters and waterproofs dust, and chemically decomposes dust, achieving both physical and chemical dust protection. This reduces the impact of humidity and dust concentration on the detection results of the sensor probe 301, thereby improving the measurement accuracy and stability of the fiber Bragg grating wind speed sensor.

[0045] In one implementation, the first coating is a multi-gradient porous coating, comprising an outer layer, a middle layer, and an inner layer. This allows for graded filtration of coarse, medium, and fine dust particles, slowing clogging and extending the coating's service life. The outer, middle, and inner layers each filter dust particles at different gradients.

[0046] For example, the outer layer of the first coating has a pore size of 10 μm, which is used to filter coarse dust particles; the middle layer has a pore size of 5 μm, which is used to filter medium dust particles; and the inner layer has a pore size of 1 μm, which is used to filter fine dust particles.

[0047] In some embodiments, to ensure the permeability of airflow, reduce the probability of dust adhering to the surface of the sensor probe 301, and improve the performance of the fiber Bragg grating wind speed sensor, the first coating is designed to have a porosity greater than 40%.

[0048] For example, the average porosity of the outer layer, middle layer, and inner layer of the first coating is 45%. It should be understood that the average porosity of the first coating can also be designed to be other values, and this embodiment of the application does not specifically limit it.

[0049] In some embodiments, to enhance the overall protection of the sensor probe 301, ensuring it has a high anti-interference capability in the high humidity and dust concentration environments of underground mines, and improving wind speed detection accuracy and stability, the surface of the flow channel 1 of the sensor probe 301 is coated with three different coatings of different materials, each with different protective properties, from the outside inward. The first coating is a porous ceramic coating; the second coating is a hydrophobic coating; and the third coating is a nano-coating with thermal conductivity.

[0050] Exemplarily, the first coating is porous aluminum oxide ( ) ceramic coating; the second coating is fluorosilane coating; the third coating is titanium dioxide ( ) graphene nanocoating. Among them, porous The ceramic coating has a thickness of 100nm, which prevents wear of the guide groove 1 and prolongs its service life. The contact angle between the fluorosilane coating and water is greater than 150°, and it has superhydrophobic properties, which can play a waterproof role. The graphene nanocoating has thermal conductivity and can decompose organic dust under photocatalysis, thereby reducing the influence of air humidity and dust concentration on the sensor probe 301 and improving the detection accuracy and stability of the fiber Bragg grating wind speed sensor.

[0051] The embodiment of the present application also provides a fiber Bragg grating wind speed sensor.

[0052] Figure 3 This is a schematic diagram of the structure of a fiber Bragg grating wind speed sensor provided in an embodiment of the present application. Figure 3 As shown, the fiber Bragg grating wind speed sensor includes the sensor probe 301 provided in the above embodiment, and a fiber Bragg grating; the fiber Bragg grating is arranged inside the guide groove 1 of the sensor probe 301.

[0053] In one implementation, the fiber Bragg grating is disposed in a dust-isolating and waterproof sensor probe 301, which can reduce the impact of dust and water vapor in the external environment on the fiber Bragg grating measurement accuracy, thereby improving the detection accuracy and stability of the fiber Bragg grating wind speed sensor.

[0054] In some embodiments, the fiber Bragg grating wind speed sensor further includes: a pump source 302, an optical cable 303 and a fiber Bragg grating demodulator 304; the top end 201 of the sensor probe 301 is connected to the pump source, and the bottom end 202 of the sensor probe 301 is connected to the optical cable; the fiber Bragg grating is connected to the fiber Bragg grating demodulator.

[0055] For example, the tip 201 of the sensor probe 301 is connected to a pump source. The pump source emits laser light that irradiates the fiber Bragg grating (FBG), heating the hot wire and bringing the thermal equilibrium of the FBG wind speed sensor to a point where the sensor reaches equilibrium. When wind blows through the environment, heat dissipates from the surface of the sensor probe 301, causing the wavelength of the FBG to shift. A FBG interrogator connected to the FBG detects this wavelength shift, which in turn detects the temperature change and then calculates the wind speed based on the temperature change.

[0056] Figure 2 This is a flow chart of a method for detecting wind speed using a fiber Bragg grating wind speed sensor provided in an embodiment of the present application.

[0057] In some embodiments, the fiber Bragg grating wind speed sensor is based on a fiber Bragg grating and uses the solution of the thermal convection equation to detect wind speed. Figure 2 As shown, the steps of detecting wind speed by the fiber Bragg grating wind speed sensor include S1-S3.

[0058] S1: Heating to equilibrium temperature.

[0059] In some embodiments, the optical fiber in the fiber Bragg grating wind speed sensor is a silver-doped optical fiber on which both a velocity grating and a temperature grating are engraved. The fiber Bragg grating is connected to a laser pump source and a fiber Bragg grating demodulator.

[0060] First, a pump source emits laser to heat the hot wire in the fiber Bragg grating temperature sensor to the equilibrium temperature. .

[0061] S2: Calculate the temperature difference.

[0062] When wind flows through the fiber Bragg grating temperature sensor, it takes away the heat of the hot wire in the fiber Bragg grating temperature sensor, causing the temperature to drop to , calculate the temperature difference .

[0063] S3: Calculate wind speed based on temperature difference.

[0064] Based on King's Law, the relationship between the heat dissipation of the hot wire in the fiber Bragg grating temperature sensor in the fluid and the flow velocity is shown in formula (1): , (1) in, is the heating power, is the current, is the hot wire resistance, is the fluid velocity, and are the hot wire temperature and the fluid temperature, and It is a constant related to the fluid properties and probe geometry.

[0065] According to the law of thermal equilibrium, under ventilation conditions, the heat consumed by the fiber Bragg grating wind speed sensor is the same as the heat absorbed. Therefore, formula (1) can be written as formula (2): , (2) in, is the power of the pump source, is the correlation coefficient of the pump source, is the absorption coefficient of silver.

[0066] Therefore, the relationship between the wavelength offset of the fiber Bragg grating and the temperature difference is shown in formula (3): , (3) in, is the Bragg wavelength shift, is the thermo-optical coefficient of the fiber Bragg grating.

[0067] In some embodiments, formula (3) is used to calculate the temperature difference. Calculate the Bragg wavelength shift , and then the fiber Bragg grating demodulator is used to obtain the hot wire temperature change of the fiber Bragg grating wind speed sensor, and then the wind speed value is calculated according to King's law to realize wind speed detection.

[0068] As can be seen from the above technical solution, the present application provides a sensor probe 301 and a fiber Bragg grating wind speed sensor. The sensor probe 301 comprises a flow channel 1 having a unidirectional asymmetric spiral structure. The surface of the flow channel 1 is sequentially coated with a first coating, a second coating, and a third coating from the outside inward. The first coating is a multi-gradient coating for graded dust filtration, the second coating is waterproof, and the third coating is for decomposing dust.

[0069] The sensor probe 301 utilizes a guide channel 1 with a unidirectional asymmetric spiral structure. This structure generates centrifugal force, which propels dust particles to the outer edge of the channel while maintaining airflow. The guide channel 1 is coated with three coatings, which physically filter and repel dust, and chemically decompose it, achieving both physical and chemical dust protection. This reduces the impact of air humidity and dust concentration on the sensor probe 301's detection results, improving the measurement accuracy and stability of the fiber Bragg grating wind speed sensor.

[0070] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A sensor probe, characterized in that: include: a guide trough (1); The guide groove (1) is a unidirectional asymmetric spiral structure; The surface of the guide groove (1) is sequentially covered with a first coating, a second coating and a third coating from the outside to the inside; The first coating is a multi-gradient coating for graded dust filtration, the second coating is for waterproofing, and the third coating is for decomposing dust.

2. The sensor probe according to claim 1, wherein: The guide groove (1) is a unidirectional asymmetric spiral structure, comprising: The pitch of the guide groove (1) gradually decreases from the inlet (101) to the outlet (102); The depth of the guide groove (1) gradually increases from the inlet (101) to the outlet (102); The width of the guide groove (1) gradually decreases from the outer side to the inner side; The angle between the guide groove (1) and the axis gradually increases from the inlet (101) to the outlet (102).

3. The sensor probe according to claim 2, characterized in that The pitch of the inlet (101) of the guide groove (1) is 10 mm, and the pitch of the outlet (102) of the guide groove (1) is 5 mm; The groove depth at the inlet (101) of the guide groove (1) is 0.5 mm, and the groove depth at the outlet (102) of the guide groove (1) is 1.5 mm; The width of the outer side of the guide groove (1) is 1.2 mm, and the width of the inner side of the guide groove (1) is 0.8 mm; The angle between the channel at the inlet (101) of the guide channel (1) and the axis is 15°, and the angle between the channel at the outlet (102) of the guide channel (1) and the axis is 45°.

4. The sensor probe according to claim 1, wherein: The first coating is a porous coating comprising an outer layer, a middle layer and an inner layer; The outer layer has a pore size of 10 μm and is used to filter coarse dust particles; The pore size of the middle layer is 5 μm, which is used to filter medium-sized dust particles; The inner layer has a pore size of 1 μm and is used to filter fine dust particles.

5. The sensor probe according to claim 4, characterized in that The porosity of the first coating layer is greater than 40%.

6. The sensor probe according to claim 1, wherein: The first coating is a porous ceramic coating; The second coating is a hydrophobic material coating; The third coating is a nano coating with thermal conductivity.

7. The sensor probe according to claim 6, characterized in that The first coating is a porous aluminum oxide ceramic coating; The second coating is a fluorosilane coating; The third coating is a titanium dioxide graphene nano coating.

8. The sensor probe according to claim 6, wherein: The thickness of the first coating layer is 100 nm; The contact angle between the second coating layer and water is greater than 150°.

9. A fiber Bragg grating wind speed sensor, characterized in that: include: The sensor probe (301) and the fiber Bragg grating (FBG) according to any one of claims 1 to 8; The optical fiber Bragg grating is arranged inside the guide groove (1) of the sensor probe (301).

10. The fiber Bragg grating wind speed sensor according to claim 9, characterized in that: The fiber Bragg grating wind speed sensor further includes: a pump source (302), an optical cable (303) and a fiber Bragg grating demodulator (304); The top end (201) of the sensor probe (301) is connected to the pump source (302), and the bottom end (202) of the sensor probe (301) is connected to the optical cable (303); The fiber Bragg grating is connected to the fiber Bragg grating demodulator (304).

Images