A fiber grating temperature measuring instrument

Abstract

The utility model relates to the technical field of fiber grating temperature measuring instrument, the utility model provides a kind of fiber grating temperature measuring instrument, be applied to steel structure surface, including temperature measuring instrument body, temperature measuring instrument body includes demodulation host computer, and demodulation host computer is connected with fiber grating sensor, further include fixed frame, fixed base, abutment plate and abutting mechanism, multiple fixed frames are fixedly arranged on steel structure surface, through slot that is cooperated with fiber grating sensor is opened in fixed frame, fixed base is hinged with fixed frame by hinge, for closing through slot, abutment plate is elastically connected in fixed base, abutting mechanism is arranged in fixed base, for driving abutment plate cooperate steel structure surface and make fiber grating sensor abutting fixed. Through the above technical scheme, the technical problem that the fixing mode that sensor and steel structure are pasted by adhesive in prior art is prone to cause sensor to separate, and the heat conduction efficiency between sensor and steel structure will also be reduced is solved.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic grating thermometers, specifically to a fiber optic grating thermometer. Background Technology

[0002] A fiber Bragg grating temperature meter is an instrument that uses fiber Bragg grating technology to measure temperature. It mainly consists of a fiber Bragg grating demodulation host, a fiber optic splitter box, a fiber Bragg grating sensor, and temperature monitoring and management software. It can be widely used in many industries such as construction. In existing technologies, fiber optic grating thermometers are used in building structure monitoring due to their high precision, anti-interference, durability, and distributed monitoring capabilities. They can be applied to temperature detection in steel structure buildings. Since steel structures (such as steel columns in factories and steel trusses in stadiums) are exposed to high outdoor temperatures (such as summer sun exposure) for extended periods, their strength can significantly decrease. Fiber optic grating sensors can be attached to key nodes of the steel structure to monitor temperature changes. For example, in a large warehouse steel structure, if the local temperature rises above 300°C due to fire hazards, the system can quickly trigger an alarm and, in conjunction with the fire protection system, reduce the risk of collapse. However, in steel structure monitoring, adhesives such as epoxy resin are commonly used to attach the sensors to the steel structure. But at high temperatures, these adhesives soften and carbonize, causing the sensors to detach from the steel structure surface and lose their monitoring capability. Furthermore, the adhesion between the sensor and the steel structure surface presents thermal resistance (such as the adhesive layer), which further reduces heat conduction efficiency at high temperatures. Utility Model Content

[0003] To overcome the above-mentioned defects, the present invention provides a fiber optic grating thermometer, which solves the technical problem that the existing method of fixing the sensor to the steel structure with adhesive can easily lead to the sensor detaching and reduce the heat conduction efficiency between the sensor and the steel structure.

[0004] According to one aspect, at least one embodiment of the present invention provides a fiber Bragg grating thermometer applied to a steel structure surface, comprising a thermometer body, the thermometer body including a demodulation host connected to a fiber Bragg grating sensor, and further including a fixing frame, a fixing base, an abutment plate, and a clamping mechanism. Multiple fixing frames are fixedly disposed on the steel structure surface, each fixing frame having a through groove that mates with the fiber Bragg grating sensor. The fixing base is hinged to the fixing frame via a hinge to seal the through groove. The abutment plate is elastically connected within the fixing base. The clamping mechanism is disposed within the fixing base and is used to drive the abutment plate to cooperate with the steel structure surface to clamp and fix the fiber Bragg grating sensor.

[0005] Preferably, in order to allow the abutment plate to be elastically disposed within the fixed base and to prevent the abutment plate from detaching from the fixed base, the fixed base is provided with a slot that mates with the fixed base, and two through holes are symmetrically provided within the fixed base. A spring is fixedly disposed within the through hole, and the other end of the spring is fixedly connected to the abutment plate.

[0006] Furthermore, the clamping mechanism includes a pressing rod, an external thread, a threaded hole, and a knob. One end of the pressing rod passes through one end of the fixed base and is rotatably connected to the abutment plate. The external thread is fitted on the pressing rod and is coaxially fixedly connected to the external thread. The threaded hole is provided in the fixed base, and the external thread is threadedly engaged with the inner wall of the threaded hole. One end of the knob is coaxially fixedly connected to the other end of the pressing rod.

[0007] Furthermore, in order to increase the thermal conductivity between the steel structure surface and the fiber optic grating sensor, thermally conductive silicone is fixedly disposed inside the fixing frame, and the thermally conductive silicone abuts against the steel structure surface.

[0008] As a further aspect of this application, in order to elastically press against the fiber optic grating sensor, a rubber pad is fixedly provided at the other end of the abutment plate.

[0009] As a further aspect of this application, in order for the abutment plate to be transferred into the fixed frame and abut against the fiber optic grating sensor during the movement after the fixed base and the fixed frame are merged, a sliding groove that cooperates with the abutment plate is provided in the fixed frame, and the sliding groove and the slot have the same cross-sectional area and are connected.

[0010] Based on the aforementioned solution, in order to prevent the abutment plate from rotating while the extrusion rod can rotate, a rotating plate is coaxially fixedly connected to one end of the extrusion rod. The rotating plate has a circular cross-section and a diameter larger than that of the extrusion rod. A rotating groove that mates with the rotating plate is provided in the abutment plate.

[0011] Furthermore, in order to ensure that the external thread always engages with the inner wall of the threaded hole after the abutment plate and the extrusion rod move, and to prevent the extrusion rod from rubbing against the inner wall of the threaded hole, the length of the threaded hole is greater than the length of the external thread, and the inner diameter of the external thread is greater than the diameter of the extrusion rod.

[0012] The beneficial effects of this utility model are as follows: In this invention, the fiber Bragg grating sensor is placed in sections into the slots of multiple fixed frames through a combination of a fixed frame, a fixed base, abutting plate, and a clamping mechanism. The fixed base is then rotated to block the fixed frames. A knob is then turned to drive the abutting plate toward the fiber Bragg grating sensor, which is then clamped and fixed in place by thermally conductive silicone and a steel structure surface. The thermally conductive silicone allows the temperature of the steel structure surface to be quickly transferred to the fiber Bragg grating sensor, providing a relatively accurate temperature reading. When the fiber Bragg grating sensor needs to be removed, the knob is turned in the opposite direction to return the abutting plate to the slot, and the fixed base is then "opened." The operation is convenient, and the fixing effect is excellent. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a fiber optic grating thermometer in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the fixed base and the fixed frame in this utility model. Figure 3 This is a partial structural cross-sectional view of the cooperation between the fixed frame, fixed seat, abutment plate and abutment mechanism in this utility model; Figure 4 This is an exploded cross-sectional view of a portion of the structure of the fixing base, fixing frame, and thermally conductive silicone in this utility model. Figure 5 This is an exploded cross-sectional view of a portion of the structure of the mating plate and the extrusion rod in this utility model.

[0015] In the diagram: 1. Steel structure surface; 2. Demodulation host; 3. Fiber optic grating sensor; 4. Fixing frame; 5. Through slot; 6. Fixing base; 7. Hinge; 8. Abutment plate; 9. Slot; 10. Spring; 11. Extrusion rod; 12. External thread; 13. Threaded hole; 14. Knob; 15. Thermal conductive silicone; 16. Rubber pad; 17. Slide; 18. Rotating plate; 19. Rotating groove; 20. Handle. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0017] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0018] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] like Figures 1-5As shown, it illustrates a fiber optic grating temperature measuring instrument in one embodiment of the present invention, applied to a steel structure surface 1. The instrument includes a temperature measuring instrument body, which includes a demodulation host 2. The demodulation host 2 is connected to a fiber optic grating sensor 3. It should be noted that the fiber optic grating sensor 3 is a sensing system composed of a fiber optic grating as the sensitive core, combined with an encapsulation structure, a transmission optical fiber, and a demodulation device. It also includes a fixing frame 4, a fixing base, an abutment plate 8, and a clamping mechanism. like Figure 1 and Figure 2 As shown, multiple fixed frames 4 are fixedly installed on the steel structure surface 1. The fixed frames 4 are connected to the steel structure surface 1 (the steel structure surface 1 blocks one end of the fixed frame 4). The fixed frames 4 have through slots 5 that cooperate with the fiber Bragg grating sensor 3 to support the fiber Bragg grating sensor 3. In order to increase the thermal conductivity of the steel structure surface 1 and the fiber Bragg grating sensor 3, thermally conductive silicone 15 is fixedly installed in the fixed frames 4. The thermally conductive silicone 15 abuts against the steel structure surface 1. The fixed base 6 is hinged to the fixed frame 4 via the hinge 7 to seal the through groove 5. A handle 20 is fixedly installed on the fixed base 6. The fiber optic grating sensor 3 is placed in the through groove 5. By holding the handle 20 and rotating the fixed base 6, the fixed base 6 and the fixed frame 4 are "merged". This can prevent the fiber optic grating sensor 3 from moving out of the fixed frame 4. It should be added that by rotating the fixing seat 6 (without blocking the fixing frame 4), the fiber optic grating sensor 3 is placed into the through slots 5 in multiple fixing frames 4 in sections. Then, the fixing seat 6 is rotated in the opposite direction to block the fixing frame 4. This method is more time-saving and easier to operate than passing the fiber optic grating sensor 3 through the through slots 5 one by one. like Figure 3 As shown, the abutment plate 8 is elastically connected to the fixed base 6. In order to make the abutment plate 8 elastically set in the fixed base 6 and prevent the abutment plate 8 from falling out of the fixed base 6, the fixed base 6 has a slot 9 that cooperates with the fixed base 6. Two through holes are symmetrically opened in the fixed base 6, and springs 10 are fixedly installed in the through holes. The other end of the spring 10 is fixedly connected to the abutment plate 8. In order to elastically press against the fiber optic grating sensor 3, a rubber pad 16 is fixedly installed on the other end of the abutment plate 8. It should be added that under the tension of the abutment plate 8, the spring 10 can still keep the abutment plate 8 in the slot 9. During the rotation of the fixed base 6, the abutment plate 8 is in the slot 9 under the action of the spring 10. In order for the abutment plate 8 to be transferred to the fixed frame 4 and press against the fiber optic grating sensor 3 during the movement after the fixed base 6 and the fixed frame 4 are merged, the fixed frame 4 has a sliding groove 17 that cooperates with the abutment plate 8. The sliding groove 17 and the slot 9 have the same cross-sectional area and are connected. like Figures 3-5As shown, the clamping mechanism is installed inside the fixed base 6, used to drive the abutment plate 8 to cooperate with the steel structure surface to clamp and fix the fiber optic grating sensor 3. The clamping mechanism includes a pressing rod 11, an external thread 12, a threaded hole 13, and a knob 14. One end of the pressing rod 11 passes through one end of the fixed base 6 and is rotatably connected to the abutment plate 8. In order to prevent the abutment plate 8 from rotating when the pressing rod 11 rotates, a rotating plate 18 is coaxially fixedly connected to one end of the pressing rod 11. The rotating plate 18 has a circular cross-section and a diameter larger than that of the pressing rod 11. A rotating groove 19 that mates with the rotating plate 18 is opened in the abutment plate 8. The external thread 12 is fitted on the pressing rod 11 and is coaxially fixedly connected to the external thread 12. A threaded hole 13 is opened in the fixed base 6, and the external thread 12 is threadedly engaged with the inner wall of the threaded hole 13. A telescopic protective sleeve is provided on the fixed base 6, and the other end of the telescopic protective sleeve... The assembly is fixedly mounted on one end of the extrusion rod 11 near the knob 14 to prevent outdoor impurities from entering the threaded hole 13. One end of the knob 14 is coaxially fixedly connected to the other end of the extrusion rod 11. By rotating the knob 14, the knob 14 drives the extrusion rod 11 to rotate. The extrusion rod 11 simultaneously drives the external thread 12 and the rotating plate 18 to rotate. The external thread 12 is threadedly engaged with the threaded hole 13. The rotation of the external thread 12 will drive the extrusion rod 11 to move. The rotating plate 18 rotates in the rotating groove 19 and does not drive the abutment plate 8 to rotate. The movement of the extrusion rod 11 will drive the abutment plate 8 to move. The movement of the abutment plate 8 will stretch the spring 10. During the movement, the abutment plate 8 moves from the slot 9 to the slide groove 17 and, together with the thermally conductive silicone 15 and the steel structure surface 1, firmly abuts and fixes the fiber optic grating sensor 3. During this process, the external thread 12 always maintains a threaded engagement with the threaded hole 13. In order to ensure that the external thread 12 can always be threaded with the inner wall of the threaded hole 13 after the abutment plate 8 and the extrusion rod 11 move, and to avoid friction between the extrusion rod 11 and the inner wall of the threaded hole 13, the length of the threaded hole 13 is greater than the length of the external thread 12, and the inner diameter of the external thread 12 is greater than the diameter of the extrusion rod 11. It should be added that the outer walls of the fixing frame 4 and the fixing seat 6 are provided with heat insulation material to prevent the fixing frame 4 and the fixing seat 6 from absorbing too much heat outdoors, which would damage the rubber pad 16. It should also be added that when the knob 14 is turned to drive the abutment plate 8 into the slide groove 17, the fixing seat 6 is also indirectly "fixed" to the fixing frame 4 through the cooperation of the fixing frame 4, the fixing seat 6, the abutment plate 8, and the extrusion rod 11, preventing the fixing seat 6 from rotating. After the fixing seat 6 rotates, the rubber pad 16 can be replaced, which is in preparation for subsequent work. Working principle: When this fiber Bragg grating thermometer is applied to a steel structure surface 1 (a steel building exposed to the outdoors), the demodulation host 2 is installed in the control room near one end of the fiber Bragg grating sensor 3 and connected to one end of the fiber Bragg grating sensor 3. Then, the other end of the fiber Bragg grating sensor 3 is pulled to the mounting position. The fiber Bragg grating sensor 3 is placed in sections onto the through slots 5 of multiple fixing frames 4. Then, the fixing base 6 is rotated to block the fixing frames 4. Then, by rotating the knob 14, the extrusion rod 11 rotates. The extrusion rod 11 simultaneously drives the external thread 12 and the rotating plate 18 to rotate. The external thread 12 is threaded into the threaded hole 13. The rotation of the external thread 12 drives the extrusion rod 18 to rotate. The pressure rod 11 moves, while the rotating plate 18 rotates within the rotating groove 19 without causing the abutment plate 8 to rotate. However, the movement of the pressure rod 11 causes the abutment plate 8 to move, which in turn stretches the spring 10. During this movement, the abutment plate 8 moves from the slot 9 to the slide groove 17, where it, together with the thermally conductive silicone 15 and the steel structure surface 1, firmly secures the fiber grating sensor 3. The thermally conductive silicone 15 allows the temperature of the steel structure surface 1 to be quickly transferred to the fiber grating sensor 3. When it is necessary to disassemble the fiber grating sensor 3, the abutment plate 8 can be returned to the slot 9 by rotating the knob 14 in the opposite direction, and then the fixing seat 6 can be "opened". The operation is convenient and the fixing effect is good.

[0023] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fiber Bragg grating thermometer, applied to a steel structure surface (1), comprising a thermometer body, wherein the thermometer body includes a demodulation host (2), and the demodulation host (2) is connected to a fiber Bragg grating sensor (3), characterized in that, Also includes: Fixed frame (4), multiple fixed frames (4) are fixedly installed on the steel structure surface (1), and through slots (5) that cooperate with the fiber optic grating sensor (3) are opened in the fixed frame (4). A fixed seat (6) is hinged to the fixed frame (4) via a hinge (7) to seal the through groove (5). Abutting plate (8) is elastically connected within the fixing seat (6); A clamping mechanism is provided inside the fixed base (6) to drive the abutment plate (8) to cooperate with the steel structure surface to clamp and fix the fiber optic grating sensor (3).

2. The fiber optic grating thermometer according to claim 1, characterized in that, The fixed base (6) has a slot (9) that matches the fixed base (6). The fixed base (6) has two through holes symmetrically arranged inside. A spring (10) is fixedly installed in the through hole. The other end of the spring (10) is fixedly connected to the abutment plate (8).

3. The fiber optic grating thermometer according to claim 2, characterized in that, The clamping mechanism includes: A pressing rod (11), one end of which passes through one end of the fixed base (6) and is rotatably connected to the abutment plate (8); External thread (12), the extrusion rod (11) is fitted with the external thread (12) and is coaxially and fixedly connected with the external thread (12); The threaded hole (13) is provided in the fixed base (6), and the external thread (12) is engaged with the inner wall thread of the threaded hole (13). A knob (14), one end of which is coaxially and fixedly connected to the other end of the extrusion rod (11).

4. The fiber optic grating thermometer according to claim 1, characterized in that, Thermally conductive silicone (15) is fixedly installed inside the fixed frame (4), and the thermally conductive silicone (15) abuts against the steel structure surface (1).

5. A fiber optic grating thermometer according to claim 1, characterized in that, A rubber pad (16) is fixedly provided at the other end of the abutment plate (8).

6. A fiber optic grating thermometer according to claim 2, characterized in that, The fixed frame (4) has a groove (17) that matches the abutment plate (8). The groove (17) and the slot (9) have the same cross-sectional area and are connected.

7. A fiber optic grating thermometer according to claim 3, characterized in that, One end of the extrusion rod (11) is coaxially fixedly connected to a rotating plate (18). The rotating plate (18) has a circular cross-section and a diameter larger than that of the extrusion rod (11). The abutment plate (8) has a rotating groove (19) that cooperates with the rotating plate (18).

8. A fiber optic grating thermometer according to claim 3, characterized in that, The length of the threaded hole (13) is greater than the length of the external thread (12), and the inner diameter of the external thread (12) is greater than the diameter of the extrusion rod (11).

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