Fluorescent optical fiber probe and preparation method thereof

Abstract

The invention relates to the technical field of fluorescent optical fiber probes, and discloses a fluorescent optical fiber probe, which comprises a probe main body containing a rare earth fluorescent material and an optical fiber excitation / detection element; the mounting seat is fixedly connected with the side surface of the probe main body and is used for fixing the probe main body on an external supporting structure; the corrugated pipe sleeves the outer side of the probe main body, one end of the corrugated pipe is fixedly connected with the mounting seat and is axially telescopic, and the other end of the corrugated pipe is provided with an axial opening; and the shielding piece is embedded at the opening of the corrugated pipe, can open or close the opening, and seals the internal space of the corrugated pipe when the probe main body is in a retracted state. A corrugated sleeve protection structure is innovatively introduced, multi-dimensional stress dissipation and shock resistance improvement are achieved, axial impact energy can be converted into elastic deformation of a corrugated layer through a specific geometric fold structure of the corrugated pipe, meanwhile, lateral impact force is absorbed through side wall buckling, and stress three-dimensional dispersion is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluorescent optical fiber probes, and in particular to a fluorescent optical fiber probe and a preparation method thereof. Background Art

[0002] In the field of optical fiber sensing technology, fluorescent optical fiber temperature sensors have been widely used in petrochemical, metallurgy, electric power, rail transportation and other industries due to their high precision and non-contact temperature measurement characteristics. 3+ , Tb 3+ The decay time constant of the fluorescence afterglow emitted by a fluorescent material (e.g., a fluorescent material) under ultraviolet or visible light illumination and excitation varies with temperature. The decay time constant of the fluorescence afterglow is a single-valued function of temperature; generally, the higher the temperature, the smaller the time constant. By measuring the decay time constant of the fluorescence signal, the temperature of the measured medium can be determined. Because this method relies solely on the properties of the fluorescent material and is unaffected by external factors such as light source intensity, transmission loss, or coupling efficiency fluctuations, it offers significant advantages such as stable measurement results, good repeatability, and fast response.

[0003] At present, there have been many studies and patent layouts for fluorescent fiber optic temperature sensing systems at home and abroad. The Chinese patent with publication number CN 206399554 U discloses a fluorescent fiber optic temperature sensor and a fluorescent fiber optic temperature sensing optical system. The system is composed of modules such as a light source driving circuit, an optical path coupling device, a fluorescent fiber optic sensor, a fluorescent signal detection circuit, and a signal demodulation processing circuit. The sensor structure includes an optical cable, a temperature measuring probe bonded to it, and a metal sleeve covering its end. The outer surface of the sleeve is provided with at least one flat portion, which increases the contact area between the probe and the object to be measured, and makes heat transfer more sufficient, thereby improving measurement accuracy and stability. However, although this solution has made useful explorations in contact surface design and system integration, the following defects are still exposed during its application in actual industrial sites:

[0004] Weak mechanical protection:

[0005] Industrial field environments are complex and ever-changing, and probes are susceptible to mechanical shock, vibration, and external factors (dust, moisture, chemical corrosion, etc.), which can damage the optical fiber or excitation / detection components, or even cause complete device failure. Traditional probes typically use a rigid straight tubing (such as a zirconia ceramic tube) to encapsulate the end face of the fluorescent fiber. While this structure can withstand minor impacts, the rigid connection between the tubing and the fiber can easily lead to stress concentration when subjected to dynamic bending stress (such as installation in vibrating pipes) or lateral impact, causing microbend losses and even fiber breakage.

[0006] Therefore, how to develop a fluorescent fiber optic probe with higher performance, stronger adaptability and higher stability and its preparation method to meet the industrial temperature measurement needs of high precision, high stability and easy maintenance is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0007] The present invention aims to solve the problem of weak mechanical protection of existing fluorescent fiber optic probes in industrial field applications, and proposes a fluorescent fiber optic probe and a preparation method thereof.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A fluorescent fiber optic probe, comprising:

[0010] The probe body contains rare earth fluorescent material and optical fiber excitation / detection elements;

[0011] A mounting base, which is fixedly connected to the side of the probe body and is used to fix the probe body to the external support structure;

[0012] The bellows is sleeved on the outside of the probe body, one end of which is fixedly connected to the mounting base and can be axially extended and contracted, and the other end of which is provided with an axial opening;

[0013] A shielding member is embedded in the opening of the bellows, which can open or close the opening and seal the internal space of the bellows when the probe body is retracted;

[0014] When in use, the probe body can pass through the shielding piece along the axial direction of the bellows and compress the corrugated layer of the bellows to move out to the measuring position, and is locked by the mounting seat after being moved out.

[0015] Preferably, a fixing plate is installed at the opening of the bellows, and an opening is opened at the center of the fixing plate. Two shielding members are provided, which are symmetrical in double petal structure and partially connected to the inner periphery of the opening to form a dynamic self-sealing structure.

[0016] Preferably, a guide rod is fixedly installed on the inner periphery of the fixing plate, the guide rod horizontally passes through the corrugated portion of the corrugated pipe and the mounting seat, and a scale is provided on the surface of the guide rod.

[0017] Preferably, the mounting seat is designed as a cavity, and a gear is installed inside the mounting seat through a rotating shaft. A rack is provided at the bottom of the guide rod, and the rack is engaged with the gear. A winding wheel is fixedly connected to one side of the gear, and a pull belt is wrapped around the outside of the winding wheel. The other end of the pull belt is movable through the mounting seat to the inside of the bellows, and is fixedly connected to the inner side of the shielding member, so that the bellows drives the winding wheel to rotate and opens or resets the shielding member when it moves axially.

[0018] Preferably, a bracket is installed on the inner side of the fixing plate, a roller assembly is provided on the bracket, and the pull belt is fixedly connected to the inner side of the shielding member through the roller assembly.

[0019] Preferably, the roller assembly is provided in two groups, and each group of roller assemblies includes a first roller and a second roller, the first roller is arranged between the second roller and the shielding member, and the pull belt passes through the second roller and the opposite sides of the first roller and is fixedly connected to the inner lower end of the shielding member, so that the semicircular shielding member can be pulled toward the two first roller positions and opened by moving the pull belt.

[0020] Preferably, an optical fiber is provided on a side of the probe body away from the fixing plate, and a reserved portion of the optical fiber is provided in the inner cavity of the mounting seat, and the reserved portion is U-shaped.

[0021] Preferably, the mounting seat is rotatably equipped with a torsion block on the side away from the bellows, a protrusion is provided on the outer side of the torsion block, a slide rail is provided on the surface of the mounting seat, a slide rod is slidably arranged in the slide rail, the end of the slide rod extends to the outside of the slide rail and is installed with a first plate body, and a second plate body is installed on one end of the two sides of the slide rail away from the torsion block, the first plate body and the second plate body are connected by a spring, the width of the end of the slide rod is smaller than the gap of the tooth block at the bottom of the rack, and the torsion block lifts the slide rod through the protrusion during rotation to extend into the gap of the rack, forcibly locking the telescopic position of the probe.

[0022] Preferably, a guide block is installed on one end of the sliding rod close to the torsion block, and an embedding groove is installed on one side of the guide block close to the torsion block.

[0023] A method for preparing a fluorescent fiber optic probe, comprising the following steps:

[0024] An alloy strip is selected to prepare a bellows, and an opening is cut at the end of the bellows;

[0025] Process the fixed plate, open a hole in the center, weld the bracket and guide rod on the side, and weld the rack at the bottom of the guide rod;

[0026] Cut the flexible shielding piece and fit it to the upper and lower sides of the opening on the fixed plate to form a double-flap closed structure;

[0027] Engage the rack at the bottom of the guide rod with the gear in the cavity of the mounting seat, assemble the winding wheel on the side end of the gear and wind the pull belt around it;

[0028] Install a first roller and a second roller on the bracket, so that the pull belt passes through the second roller and the first roller to form an S-shaped wrap angle and then connects to the flexible shielding member;

[0029] Reserve a U-shaped excess length of the optical fiber in the cavity of the mounting base and fix it with a clip. Place the probe body into the corrugated tube and connect the optical fiber.

[0030] Install the torsion block with the protrusion on the rear end of the mounting base, and install the slide rail, slide rod, guide block and spring. Adjust the gap between the slide rod in the slide rail and the bottom of the rack so that the end of the slide rod can be inserted into the rack tooth gap to achieve self-locking.

[0031] Fill the interface between the bellows and the mounting seat with fluorosilicone sealant to complete the preparation.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention innovatively introduces a corrugated sleeve protection structure to achieve the following effects:

[0034] Multi-dimensional stress dissipation, improved impact resistance:

[0035] The unique geometric pleated structure of the bellows can convert axial impact energy into elastic deformation of the corrugated layer, while absorbing lateral impact force through side wall buckling to achieve three-dimensional stress dispersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the composition of a fluorescent fiber optic probe proposed by the present invention;

[0037] Figure 2 This is a right side view of a fluorescent fiber optic probe proposed by the present invention;

[0038] Figure 3 This is a schematic diagram of the guide rod end of a fluorescent fiber optic probe proposed in the present invention;

[0039] Figure 4 A top view of the arrangement of the pull belt, first roller and second roller of a fluorescent fiber optic probe proposed by the present invention;

[0040] Figure 5 This is a left view of a fluorescent fiber optic probe proposed by the present invention.

[0041] In the figure: 1. Probe body; 2. Mounting seat; 3. Bellows; 4. Fixing plate; 5. Shielding member; 6. Opening; 7. Opening; 8. Guide rod; 9. Scale; 10. Rack; 11. Gear; 12. Pull belt; 13. Bracket; 14. First roller; 15. Second roller; 16. Optical fiber; 17. Twist block; 18. Protrusion; 19. Slide rail; 20. Slide rod; 21. First plate; 22. Second plate; 23. Spring; 24. Guide block; 25. Embedded groove; 26. Winding wheel. DETAILED DESCRIPTION

[0042] In order to make the technical means, objectives and effects of the present invention easier to understand, embodiments of the present invention are described in detail below with reference to specific figures.

[0043] It should be noted that all terms used in the present invention to indicate direction and position, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "low", "lateral", "longitudinal", "center", etc., are only used to explain the relative position relationship and connection status between the components in a certain specific state (as shown in the accompanying drawings). They are only for the convenience of describing the present invention, and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0044] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0045] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] Reference Figure 1-Figure 5The present application discloses a fluorescent fiber optic probe, comprising a probe body 1, a mounting base 2, a bellows 3 and a flexible shielding member 5. The mounting base 2 is fixed to the side of the probe body 1 and docked with an external support structure, such as an external robotic arm or other supporting device, for supporting the mounting base 2 after the probe body 1 is installed. The side of the mounting base 2 is provided with an axially retractable bellows 3, which is sleeved on the outside of the probe body 1. The bellows 3 is provided with an opening 6 on the side away from the mounting base 2, and a flexible The shielding member 5 is used to close the internal space of the bellows 3 when the probe body 1 is not in use. The probe body 1 is completely stored in the bellows 3 when not in use. The shielding member 5 blocks external dust and water vapor, protecting the probe body 1 and the internal optical fiber components from environmental damage; when in use, the probe body 1 is moved out of the bellows 3 by the mounting seat 2, the corrugated layer of the bellows 3 is compressed and the probe body 1 extends through the shielding member 5. After moving to the predetermined position, the mounting seat 2 locks the probe body 1, achieving close contact with the surface to be measured and starting temperature measurement.

[0047] The present invention introduces a bellows 3 and a flexible shielding member 5 outside the probe body 1 to form a protective structure of the probe body 1, so that the probe body 1 can achieve environmental sealing and adaptive deformation in both the retracted and extended states. The geometric pleated structure of the bellows 3 provides elastic buffering during axial impact and absorbs energy through wall buckling during lateral impact, significantly improving the mechanical protection capability. The quick locking mechanism of the mounting base 2 realizes the stable positioning of the probe body 1, thereby significantly improving the measurement accuracy, stability and on-site installation efficiency.

[0048] As a preferred example of the present application, a fixing plate 4 is installed at the opening 6 at one end of the bellows 3 away from the mounting seat 2. An opening 7 is provided at the center of the fixing plate 4. Double-flap flexible shielding members 5 are bonded to the upper and lower sides of the inner circle of the opening 7. The shielding member 5 is only connected to the inner circumference of the opening 7 at the top portion, and the rest of the shielding member 5 can open or close the opening 7 when the probe body 1 is extended and retracted. When the probe body 1 is retracted into the bellows 3, the double-flap shielding member 5 automatically closes the opening 7 under the action of its own elasticity, tightly fitting to form a dynamic self-sealing structure, blocking dust and water vapor from entering the interior of the bellows 3; when the probe body 1 is extended for use, the double-flap shielding member 5 can be automatically opened during the movement of the probe body 1 or when the bellows 3 is compressed. The shielding member 5 elastically opens and does not hinder the extension of the probe body 1.

[0049] As a preferred example of the present application, a guide rod 8 is fixedly installed on the inner periphery of the fixed plate 4. The guide rod 8 moves horizontally and axially through the corrugated part of the bellows 3 and the mounting seat 2. The surface of the guide rod 8 is provided with a scale 9, and the accuracy of the scale 9 is 0.1mm. When the bellows 3 is axially compressed or stretched due to the need to fit the measured surface, the fixed plate 4 and the guide rod 8 are synchronously displaced relative to the mounting seat 2, and the bellows 3 is guided and positioned by the mounting seat 2, and the bellows 3 is axially compressed or stretched, extending or retracting the probe body 1 into the bellows 3. The operator can directly know the current compression or extension of the bellows 3 by observing the reading on the scale 9 of the guide rod 8, thereby realizing intuitive monitoring of the deformation state of the bellows 3 and inferring the position of the internal probe body 1.

[0050] This design directly couples the deformation of the guide rod 8 with that of the bellows 3, and provides a high-precision scale 9 on the surface of the guide rod 8, thereby realizing real-time and intuitive monitoring of the degree of compression or extension of the bellows 3 without the need for additional detection equipment. This enables the operator to quickly determine the installation position of the probe body 1, significantly improving the installation reliability of the probe body 1, while simplifying the on-site debugging and maintenance process.

[0051] As a preferred example of the present application, the mounting seat 2 is designed as a cavity, and a gear 11 is installed inside the mounting seat 2 through a rotating shaft. A rack 10 is fixedly installed at the bottom of the guide rod 8, and the rack 10 is integrally formed with the guide rod 8. The rack 10 is meshed with the gear 11. One side of the gear 11 is fixedly connected to a winding wheel 26, and a pull belt 12 is wrapped around the outer side of the winding wheel 26. The other end of the pull belt 12 can move through the mounting seat 2 to the inside of the bellows 3 and is fixedly connected to the inner side of the shielding member 5. The rack 10 at the bottom of the guide rod 8 is meshed with the gear 11, converting the axial displacement of the bellows 3 into a rotational motion of the winding wheel 26 (for example, in this embodiment, the transmission ratio is 1:2.5), thereby achieving amplification of the stroke of the pull belt 12 and optimization of force transmission. When the probe body 1 moves outward, the shielding member 5 can be driven to deflect inward. This method will not cause the probe body 1 to push the shielding member 5 outward, thereby interfering with the installation of the probe body 1.

[0052] This application introduces a linkage design of a transmission mechanism of gears 11 and racks 10 and a pull belt 12 to drive the shielding member 5, which will dynamically realize the self-sealing and opening functions during the extension and retraction of the probe body 1. Combined with the multi-layer pleated structure of the bellows 3, a composite system of mechanical protection and environmental sealing is constructed. When the probe body 1 is retracted, this structure can automatically close the shielding member 5 to block the intrusion of dust and water vapor to protect the internal components. When the probe body 1 is extended, the shielding member 5 automatically opens without interfering with the measurement process, thereby improving the overall performance and stability of the probe body 1.

[0053] As a preferred example of the present application, a bracket 13 is installed on the inner side of the fixed plate 4, and a roller assembly is provided on the bracket 13. The pull belt 12 is fixedly connected to the inner side of the shielding member 5 through the roller assembly. In the example of the present application, in order to ensure that the pull belt 12 moves stably during the deformation of the bellows 3 and drives the shielding member 5 to open and close smoothly, a bracket 13 with a roller assembly is installed on the inner side of the fixed plate 4. Preferably, the roller assembly includes two sets of rollers, which together constitute a dual-degree-of-freedom guide path. When the pull belt 12 passes through these two sets of rollers, an S-shaped wrapping path is realized, which not only effectively eliminates the lateral deviation of the pull belt 12 during the deformation of the bellows 3, but also ensures the stability and directionality of the pull belt 12 during the movement.

[0054] As a preferred example of the present application, the roller assembly is provided with two groups, and each group of roller assemblies includes a first roller 14 fixedly mounted on the bracket 13 and a second roller 15 rotatably mounted on the bracket 13. The second roller 15 can provide a smooth movement for the drawstring 12, and the first roller 14 is used to fit the shielding member 15 after being pulled, so there is no need for rotation. The first roller 14 is arranged between the second roller 15 and the shielding member 5, and the drawstring 12 is fixedly connected to the inner lower end of the shielding member 5 through the top of the second roller 15 and the bottom of the first roller 14. As the drawstring 12 moves, the shielding member 5 is pulled, and since the shielding member 5 is semicircular in shape, it can Pulling the two ends of the bottom thereof respectively toward the positions of the two first rollers 14 makes it easy to open the two shielding members 5. In addition, the drawstring 12 is made of elastic material, such as rubber or silicone. Because after the shielding member 5 is pulled to abut against the first roller 14, the probe body 1 continues to move outward. In order to prevent the rack 10 from continuing to transmit the gear 11 and causing damage to the drawstring 12, the drawstring 12 is integrally formed with rubber or silicone material. When the shielding member 5 is not in place, the deformation of the drawstring 12 is small, which can ensure that the shielding member 5 is opened smoothly. After the shielding member 5 is in place, the drawstring 12 generates elastic stretching when the gear 11 continues to rotate, and the probe body 1 continues to move toward the bellows 3.

[0055] This design cleverly converts the linear displacement of the pull strap 12 into a symmetrical pulling force through upper and lower double rollers and an S-shaped path, acting on the side of the semicircular shielding member 5 away from the hinged end, thereby achieving balanced and synchronous opening and closing of the shielding member 5. The roller assembly eliminates the lateral offset of the pull strap 12, reduces friction and wear, and significantly improves the smoothness and reliability of the movement of the shielding member 5, while ensuring the stable operation of the dynamic self-sealing structure and the long-term reliability of the probe body 1 in harsh environments.

[0056] As a preferred example of the present application, an optical fiber 16 is provided on one side of the probe body 1 away from the fixed plate 4, and a reserved portion of the optical fiber 16 is provided in the inner cavity of the mounting base 2, and the reserved portion is U-shaped. In the example of the present application, by reserving the optical fiber 16 designed as a U-shaped structure in the inner cavity of the mounting base 2, not only the layout of the optical fiber 16 in the mounting base 2 is optimized, but also the necessary deformation buffer margin is provided for the optical fiber 16. In actual applications, when the probe body 1 is subjected to external force or vibration, the optical fiber 16 in the U-shaped reserved portion can absorb and disperse these external forces or vibrations through its own elastic deformation, thereby protecting the optical fiber 16 from damage and ensuring the stability and accuracy of signal transmission.

[0057] As a preferred example of the present application, a torsion block 17 is rotatably installed on the side of the mounting seat 2 away from the bellows 3, and a protrusion 18 is installed on the outer side of the torsion block 17. A slide rail 19 is installed on the surface of the mounting seat 2. A slide rod 20 is slidingly arranged in the slide rail 19, and the end of the slide rod 20 extends to the outside of the slide rail 19. A first plate body 21 is installed on the end of the slide rod 20, and a second plate body 22 is installed on one end of both sides of the slide rail 19 away from the torsion block 17. The first plate body 21 and the second plate body 22 are connected by a spring 23. The width of the end of the slide rod 20 is smaller than the gap of the tooth block at the bottom of the rack 10. During the rotation process, the torsion block 17 lifts the slide rod 20 through the protrusion 18 to extend into the gap of the rack 10, forcibly locking the telescopic position of the probe body 1. In the example of the present application, when the probe body 1 needs to be fixed in a specific telescopic position, the operator rotates the torsion block 17 clockwise. The protrusion 18 of the torsion block 17 cooperates with the lower end of the slide bar 20 to push the slide bar 20 to slide along the slide rail 19 and stretch the spring 23. The end of the slide bar 20 is inserted into the bottom tooth gap of the rack 10 and meshes with the rack 10, thereby locking the axial displacement of the bellows 3 in this position through the rack 10-gear 11 transmission mechanism and the pull belt 12-shielding member 5 system, thereby achieving the purpose of forcibly locking the telescopic position of the probe body 1; when the lock needs to be released, the torsion block 17 is rotated counterclockwise, causing the spring 23 to release its potential energy and reset, pushing the slide bar 20 out of the tooth gap to release the lock, thereby allowing the probe body 1 to freely extend and retract within the bellows 3. Preferably, two protrusions 18 are symmetrically provided on the torsion block 17.

[0058] The present application uses a two-way self-locking adjustment structure formed by the torsion block 17, the protrusion 18, the slide rail 19, and the slide rod 20. The torsion block 17 rotates to drive the slide rod 20 to move up and down, and the reset design of the spring 23 is used to achieve rapid locking and release of the probe body 1 at any telescopic position. Positioning and unlocking can be completed through simple rotation operations without additional tools, which significantly improves the efficiency of on-site installation and debugging. At the same time, the mechanism can withstand the deformation of the bellows 3 and external vibration in the locked state, ensure the position stability of the probe body 1 and quickly restore it to a free movement state after unlocking, thereby taking into account both operational convenience and measurement reliability.

[0059] As a preferred example of the present application, the slide bar 20 is provided with a guide block 24 at one end close to the torsion block 17, and an embedding groove 25 is provided on the side of the guide block 24 close to the torsion block 17. In the example of the present application, the U-shaped embedding groove 25 is provided on the side of the guide block 24 close to the torsion block 17. When the torsion block 17 rotates, the protrusion 18 on it can be accurately embedded in the U-shaped embedding groove 25 of the guide block 24, forming a self-centering structure. This not only ensures the precise alignment between the torsion block 17 and the slide bar 20, but also significantly enhances the connection stability between the two. When the probe needs to be fixed in position, by rotating the torsion block 17 so that the protrusion 18 is embedded in the U-shaped embedding groove 25, a firm lock between the slide bar 20 and the torsion block 17 can be achieved, thereby effectively preventing the probe from accidentally moving during the measurement process. The operation is simple, allowing the user to complete the fixing and unlocking operations of the probe body 1 more quickly and accurately.

[0060] It should also be noted that the outer diameters of the fixing plate 4 and mounting base 2 are larger than those of the bellows 3. This design provides the fixing plate 4 with a sufficient mounting surface for securely securing the probe body 1 to the measured location. Specifically, several through-holes for inserting bolts can be provided in the fixing plate 4, which are then tightened to securely secure the probe body 1 to the target location. After the probe body 1 is installed, the mounting base 2 is then mounted near the fixing plate 4 using an external support structure such as a robotic arm, thereby completing the overall installation and layout of the fluorescent fiber optic probe.

[0061] Moreover, since the bellows 3 itself has a certain flexible structural characteristic, it can also adapt to installation with a smaller inclination during installation. That is, when installed on an inclined surface, the bellows 3 can achieve this process through axial compression deviation on the upper and lower sides (this deviation only allows about 10% of the total stroke), which can effectively improve the applicability of the installation of this device.

[0062] This embodiment also provides a method for preparing a fluorescent fiber optic probe, which includes the following steps:

[0063] S1, bellows 3 forming;

[0064] Inconel 718 alloy strip was selected and pressed into a bidirectional multi-layer corrugated structure by a hydraulic corrugation forming machine. The surface was electrolytically polished (Ra ≤ 0.2 μm) to obtain a bellows 3;

[0065] Laser cut an opening 6 (6 mm in diameter) at the end of the bellows 3, and chamfer the edges (R0.3 mm);

[0066] A 316L stainless steel fixing plate 4 is machined using wire cutting, a circular opening 7 (4 mm in diameter) is opened in the center, a bracket 13 and a guide rod 8 are welded to the side, and a rack 10 is welded to the bottom of the guide rod 8;

[0067] S2, preparation of the flexible shielding member 5;

[0068] Cut a polyimide film (thickness 0.1mm) as the flexible shielding member 5, coat the edges with fluororubber adhesive, and adhere them to the upper and lower sides of the opening 7 of the fixing plate 4, respectively, to form a double-flap closed structure;

[0069] S3, transmission mechanism assembly;

[0070] In the cavity of the mounting seat 2, a stainless steel gear 11 is mounted via a rotating shaft, and the gear 11 meshes with the rack 10 at the bottom of the guide rod 8;

[0071] An aluminum alloy winding wheel 26 is assembled on the side end of the gear 11, and a polytetrafluoroethylene-coated glass fiber pull belt 12 is wound around it;

[0072] Install the first and second zirconia ceramic rollers 14 and 15 on the bracket 13, with a center distance of 8 mm between the two rollers. Ensure that the pull belt 12 forms an S-shaped wrap angle when passing through the top of the second roller 15 and the bottom of the first roller 14, and then connect to the shielding member 5;

[0073] S4. Optical probe installation:

[0074] The optical fiber 16 is left with a U-shaped excess length in the cavity of the mounting base 2 and fixed with a ceramic clip to prevent excessive stretching of the bellows 3 when it expands and contracts. The optical fiber 16 is then connected to the probe body 1 and the probe body 1 is placed in the bellows 3.

[0075] S5. Assembly of linkage mechanism:

[0076] Install the torsion block 17 (ABS engineering plastic) with the protrusion 18 to the rear end of the mounting base 2, and then install the slide rail 19, slide rod 20, guide block 24 and spring 23. Adjust the gap between the slide rod 20 in the slide rail 19 and the bottom of the rack 10, and ensure that the end of the slide rod 20 can freely penetrate the tooth gap of the rack 10.

[0077] Fill the interface between the bellows 3 and the mounting base 2 with fluorosilicone sealant. After installation, place the whole in a vacuum tank (-80kPa) and maintain the pressure for 30 minutes. The leakage rate is less than 1×10 -6 Pa·m 3 / s, complete the preparation process.

[0078] The present application constructs a composite structure of environmental sealing and mechanical protection by combining the bellows 3 and the flexible shielding member 5. When the probe body 1 is retracted, the shielding member 5 automatically closes to block the intrusion of dust and water vapor. When the probe body 1 is extended, the shielding member 5 elastically opens without interfering with the measurement. The geometric pleated structure of the corrugated member 3 provides elastic buffering during axial impact and absorbs energy through wall buckling during lateral impact, thereby significantly improving the impact resistance of the probe body 1. The guide rod 8 is directly coupled with the deformation of the fixed plate 4 and the bellows 3, and a high-precision scale 9 is provided on the surface of the guide rod 8 to realize real-time visual monitoring of the compression and extension degree of the bellows 3, so that the operator can quickly determine the location of the probe body 1 without additional equipment, effectively simplifying the installation process. In addition, the gear 11-rack 10-winding wheel 26-pull belt 12 linkage mechanism and the roller guide path accurately transmit the telescopic movement of the probe body 1 to the shielding member, realizing dynamic self-sealing and opening functions, and eliminating the lateral deviation of the pull belt 12 to ensure smooth and reliable shielding member movement; combined with the two-way self-locking design composed of the torsion block 17, slide rail 19, slide rod 20 and spring 23, the probe body 1 can be quickly locked and released at any telescopic position, and can be operated without tools, significantly improving on-site debugging efficiency. The fluorescent fiber optic probe and its preparation method described in this application not only greatly improve the measurement accuracy and stability, but also simplify the installation and maintenance process, extend the service life, and meet the needs of high reliability and easy maintainability in industrial sites.

[0079] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A fluorescent fiber optic probe, characterized in that: include: A probe body (1) containing rare earth fluorescent material and an optical fiber (16) excitation / detection element; A mounting seat (2) fixedly connected to a side surface of the probe body (1) and used for fixing the probe body (1) to an external support structure; A bellows (3) is sleeved on the outside of the probe body (1), one end of which is fixedly connected to the mounting seat (2) and can be axially retracted, and the other end of which is provided with an axial opening (6); a shielding member (5) embedded in the opening (6) of the bellows (3), capable of opening or closing the opening (6) and sealing the internal space of the bellows (3) when the probe body (1) is retracted; When in use, the probe body (1) can pass through the shielding member (5) along the axial direction of the bellows (3) and compress the folded layer of the bellows (3) to move out to a measuring position, and is locked by the mounting seat (2) after being moved out.

2. A fluorescent fiber optic probe according to claim 1, characterized in that: A fixing plate (4) is also installed at the opening (6) of the bellows (3), and an opening (7) is provided at the center of the fixing plate (4). Two shielding members (5) are provided, forming a double-petal structure symmetrical in upper and lower directions and partially connected to the inner periphery of the opening (7), forming a dynamic self-sealing structure.

3. A fluorescent fiber optic probe according to claim 2, characterized in that: A guide rod (8) is fixedly mounted on the inner periphery of the fixed plate (4). The guide rod (8) horizontally penetrates the corrugated portion of the corrugated tube (3) and the mounting seat (2), and a scale (9) is provided on its surface.

4. A fluorescent fiber optic probe according to claim 3, characterized in that: The mounting seat (2) is designed as a cavity, and a gear (11) is installed inside the mounting seat (2) through a rotating shaft. A rack (10) is provided at the bottom of the guide rod (8), and the rack (10) is engaged with the gear (11). One side of the gear (11) is fixedly connected to a winding wheel (26), and a pull belt (12) is wound around the outer side of the winding wheel (26). The other end of the pull belt (12) is movable through the mounting seat (2) to the inside of the bellows (3), and is fixedly connected to the inner side of the shielding member (5), so that the bellows (3) drives the winding wheel (26) to rotate when it moves axially and opens or resets the shielding member (5).

5. A fluorescent fiber optic probe according to claim 4, characterized in that: A bracket (13) is installed on the inner side of the fixing plate (4), a roller assembly is provided on the bracket (13), and the pull belt (12) is fixedly connected to the inner side of the shielding member (5) through the roller assembly.

6. A fluorescent fiber optic probe according to claim 5, characterized in that: The roller assembly is provided in two groups, and each group of roller assemblies includes a first roller (14) and a second roller (15), the first roller (14) is provided between the second roller (15) and the shielding member (5), and the drawstring (12) passes through the second roller (15) and the first roller (14) on opposite sides and is fixedly connected to the inner lower end of the shielding member (5), so that the drawstring (12) moves to drive the semicircular shielding member (5) to be pulled toward the two first roller (14) positions and opened.

7. A fluorescent fiber optic probe according to claim 6, characterized in that: An optical fiber (16) is provided on a side of the probe body (1) away from the fixing plate (4), and a reserved portion of the optical fiber (16) is provided in the inner cavity of the mounting seat (2), and the reserved portion is U-shaped.

8. The fluorescent fiber optic probe according to claim 7, characterized in that: The mounting seat (2) is rotatably equipped with a torsion block (17) on the side away from the bellows (3), and a protrusion (18) is provided on the outer side of the torsion block (17). The surface of the mounting seat (2) is provided with a slide rail (19), and a slide rod (20) is slidably arranged in the slide rail (19). The end of the slide rod (20) extends to the outside of the slide rail (19) and is installed with a first plate body (21). The ends of the two sides of the slide rail (19) away from the torsion block (17) are installed with a second plate body (22). The first plate body (21) and the second plate body (22) are connected by a spring (23). The width of the end of the slide rod (20) is smaller than the gap of the tooth block at the bottom of the rack (10). During the rotation process, the torsion block (17) lifts the slide rod (20) through the protrusion (18) and extends into the gap of the rack (10), forcibly locking the telescopic position of the probe.

9. The fluorescent fiber optic probe according to claim 8, characterized in that: A guide block (24) is installed on one end of the slide bar (20) close to the torsion block (17), and an embedding groove (25) is installed on one side of the guide block (24) close to the torsion block (17).

10. A method for preparing a fluorescent fiber optic probe, comprising preparing a fluorescent fiber optic probe according to any one of claims 1 to 9, characterized in that: The following steps are involved: An alloy strip is selected to prepare a bellows (3), and an opening (6) is cut at the end of the bellows (3); Processing a fixed plate (4), opening an opening (7) in the center thereof, welding a bracket (13) and a guide rod (8) on the side, and welding a rack (10) on the bottom of the guide rod (8); Cutting the flexible shielding member (5) and attaching it to the upper and lower sides of the opening (7) on the fixed plate (4) to form a double-flap closed structure; The rack (10) at the bottom of the guide rod (8) is meshed with the gear (11) in the cavity of the mounting seat (2), and a winding wheel (26) is assembled on the side end of the gear (11) and the drawstring (12) is wound around it; A first roller (14) and a second roller (15) are installed on the bracket (13), so that the pull belt (12) passes through the second roller (15) and the first roller (14) to form an S-shaped wrap angle and then is connected to the flexible shielding member (5); A U-shaped excess length of the optical fiber (16) is reserved in the cavity of the mounting seat (2) and fixed with a clip, and the probe body (1) is placed in the corrugated tube (3) and connected to the optical fiber (16); Install the torsion block (17) with the protrusion (18) at the rear of the mounting seat (2), and install the slide rail (19), the slide rod (20), the guide block (24) and the spring (23). Adjust the gap between the slide rod (20) in the slide rail (19) and the bottom of the rack (10) so that the end of the slide rod (20) can be inserted into the tooth gap of the rack (10) to achieve self-locking. The interface between the bellows (3) and the mounting seat (2) is filled with fluorosilicone sealant to complete the preparation.

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