Temperature-maintaining testing device for high-precision temperature testing of fiber ring

Abstract

The application provides a heat preservation testing device for high-precision temperature testing of an optical fiber ring, which comprises a base, an intermediate cylinder arranged on the base, a cover arranged at an end of the intermediate cylinder away from the base, an inner protruding part arranged at the center of the base in the intermediate cylinder, a Y waveguide assembly placed on the inner protruding part, and an optical fiber ring placed in the intermediate cylinder. The Y waveguide assembly is used for connecting with the optical fiber ring. A clamping cavity is arranged on the side wall of the intermediate cylinder. At least two second communication openings are arranged on the intermediate cylinder and communicate with the clamping cavity. A first liquid guide pipe is arranged on one side of the base. At least two first communication openings are arranged on the base and respectively communicate with both ends of the first liquid guide pipe. Heat-conducting liquid is arranged in the clamping cavity and the first liquid guide pipe. The problem that the test result is deviated due to uneven temperature when the traditional oven is used to test the optical fiber ring is solved.

Description

Technical Field

[0001] This invention relates to the field of fiber optic gyroscope temperature testing, and in particular to a heat preservation testing device for high-precision temperature testing of fiber optic rings. Background Technology

[0002] A fiber optic gyroscope is an angular rate sensor based on the Sagnac effect, highly sensitive to stress and temperature characteristics in its application environment. Its core sensing component, the fiber optic ring, is made of a certain length of optical fiber wound together. When the temperature characteristics of the environment change, the zero bias of the fiber optic gyroscope changes, affecting its accuracy. The production process of the fiber optic ring is complex and requires high precision; products wound by the same equipment and personnel can often have significantly different final performance. Therefore, performance testing of fiber optic gyroscopes is a necessary step, measuring zero bias, scaling factor, and power consumption under specific temperatures.

[0003] Traditional testing methods involve placing batches of fiber optic rings into a temperature chamber, then extending the pigtails out of the chamber and connecting them to the test unit, or directly placing them on a platform for testing. However, the vibration of long fiber optic rings during testing interferes with the results. Furthermore, the large size of the temperature chamber leads to significant temperature differences between the area near the heat source and the central region, and the uneven temperature distribution throughout the chamber means each fiber optic ring is under different temperature conditions. This makes it difficult to accurately reflect the environmental state of each ring, resulting in highly inconsistent test results. Summary of the Invention

[0004] This invention provides a thermal insulation testing device for high-precision temperature testing of fiber optic rings, which solves the problem of uneven temperature leading to deviations in test results when using a temperature chamber for testing fiber optic rings in the traditional way.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a heat preservation testing device for high-precision temperature testing of optical fiber rings, comprising a base, an intermediate cylinder on the base, a cover at one end of the intermediate cylinder away from the base, an inner protrusion in the center of the base inside the intermediate cylinder, a Y-waveguide assembly placed on the inner protrusion, an optical fiber ring placed inside the intermediate cylinder, the Y-waveguide assembly being used to connect with the optical fiber ring, a cavity on the side wall of the intermediate cylinder, at least two second connecting ports on the intermediate cylinder, the second connecting ports communicating with the cavity, a first liquid guiding pipe on one side of the base, at least two first connecting ports on the base, each first connecting port communicating with both ends of the first liquid guiding pipe, and a heat-conducting liquid inside the cavity and the first liquid guiding pipe.

[0006] In the preferred embodiment, a temperature and humidity sensor is provided in the center of the intermediate cylinder, and the temperature and humidity sensor extends into the intermediate cylinder.

[0007] The intermediate cylinder can monitor the temperature and humidity of the environment where the fiber optic ring and Y-waveguide components are located, provide accurate feedback to the test system, and facilitate real-time adjustment of the temperature of the circulating heat transfer fluid.

[0008] In the preferred embodiment, the base is provided with a fiber outlet hole, and the two ends of the fiber outlet hole are respectively connected to the inside of the intermediate cylinder and the outside.

[0009] In the preferred embodiment, a central cylinder is provided on the side of the base near the middle cylinder. The side wall of the central cylinder has a hollow structure, and a second liquid guide tube is provided inside the side wall of the central cylinder. The outer diameter of the central cylinder is smaller than the inner diameter of the fiber optic ring, and the Y waveguide assembly is placed inside the central cylinder.

[0010] In the preferred embodiment, a first liquid guide tube is provided inside the cover body.

[0011] In a preferred embodiment, a heat spreader assembly is provided inside the intermediate cylinder. The heat spreader assembly includes a bottom frame and a top frame. Multiple heat-conducting columns are arranged circumferentially between the bottom frame and the top frame. The heat-conducting columns, the bottom frame, and the top frame form a cage-like structure. An optical fiber is looped inside the cage-like structure. The bottom frame is in contact with the base, and the top frame is in contact with the cover.

[0012] In a preferred embodiment, the bottom frame and the top frame are provided with multiple guide grooves along the circumference, and one end of the heat-conducting column is provided with a snap-fit ​​part, and the snap-fit ​​part of each heat-conducting column is slidably snapped into the guide groove of the bottom frame or the guide groove of the top frame.

[0013] In the preferred embodiment, the number of guide grooves on each end frame is a multiple of four, and the number of guide grooves on each end frame is twice the number of heat-conducting fins. The heat-conducting fins of the bottom end frame and the heat-conducting fins of the top end frame are arranged circumferentially at intervals.

[0014] In a preferred embodiment, both the base and the cover are provided with lifting frame assemblies. Each lifting frame assembly is connected to the bottom frame and the top frame respectively. Each lifting frame assembly is slidably sleeved with the base or the cover. Each guide groove of the bottom frame and the top frame is provided with a strip-shaped through groove. The side of the lifting frame assembly away from the bottom frame and the top frame is provided with a coil groove. The first liquid guide tube is located in the coil groove. The side of the lifting frame assembly near the bottom frame and the top frame is provided with multiple strip-shaped receiving slots along the circumference. Each strip-shaped receiving slot is aligned with each strip-shaped through groove for the insertion of the heat-conducting column. The width of the strip-shaped through groove and the strip-shaped receiving slot is greater than the width of the heat-conducting column.

[0015] In a preferred embodiment, the base and the cover are provided with a clamping plate and a clamping screw. One end of the clamping plate is used to fit tightly against the lifting frame assembly, and the clamping screw is threadedly connected to the base or the cover. The end of the clamping screw clamps against the back side of the clamping plate.

[0016] The beneficial effects of this invention are as follows: The use of an independent heat preservation device overcomes adverse environmental factors such as fiber jitter and uneven temperature during batch testing of fiber optic rings, resulting in more accurate test results and higher consistency in the testing environment for each fiber optic ring. It enables precise testing of products with high measurement data differences in batches, reducing product scrap. It reduces thermal radiation and other interference generated by internal integrated devices, retaining only the Y-waveguide devices in sensitive areas, which facilitates miniaturization of the heat preservation device and reduces energy consumption. The use of a heat spreader increases the contact area with air, improving the thermal sensitivity of the internal space of the heat preservation device. The volume of the heat spreader is adjustable to adapt to different products, reducing testing costs. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the present invention.

[0019] Figure 2 This is an exploded view of the present invention.

[0020] Figure 3 This is an internal sectional view of the present invention.

[0021] Figure 4 This is a diagram of the heat transfer fluid operating system of the present invention.

[0022] Figure 5 This is a structural diagram of the relatively convergent lifting frame assembly of the heat preservation device of the present invention.

[0023] Figure 6 This is a schematic diagram of the lifting frame assembly of the present invention in relative open position.

[0024] Figure 7 This is a schematic diagram of the central cylinder of the base of the heat preservation device of the present invention.

[0025] Figure 8 This is an exploded schematic diagram of the cage structure of the present invention.

[0026] Figure 9 This is a structural diagram of the end frame of the present invention.

[0027] Figure 10 This is a schematic diagram of the inner limit position of the heat-conducting pillar of the present invention.

[0028] Figure 11 This is a schematic diagram of the outer limit position of the heat-conducting pillar of the present invention.

[0029] In the figure: Base 1; First connecting port 101; First liquid guide tube 102; Fiber outlet 103; Central cylinder 104; Shelf 105; Second liquid guide tube 106; Cover 2; Intermediate cylinder 3; Second connecting port 301; Clamping cavity 302; Inner protrusion 4; Temperature and humidity sensor 5; Fiber optic ring 6; Y-waveguide assembly 7; Heat spreader assembly 8; Heat-conducting column 801; Bottom end frame 802; Top end frame 803; Guide groove 804; Snap-fit ​​part 805; Strip through groove 806; Lifting frame assembly 9; Coil groove 901; Strip receiving slot 902; Cover 10; Tightening plate 11; Tightening screw 12. Detailed Implementation

[0030] Example 1: like Figure 1-11 A heat preservation testing device for high-precision temperature testing of fiber optic rings includes a base 1, an intermediate cylinder 3 on the base 1, a cover 2 at one end of the intermediate cylinder 3 away from the base 1, an inner protrusion 4 in the center of the base 1 inside the intermediate cylinder 3, a Y-waveguide assembly 7 placed on the inner protrusion 4, a fiber optic ring 6 placed inside the intermediate cylinder 3, the Y-waveguide assembly 7 being connected to the fiber optic ring 6, a cavity 302 on the side wall of the intermediate cylinder 3, and at least two second connecting ports 301 on the intermediate cylinder 3, the second connecting ports 301 communicating with the cavity 302, a first liquid guiding pipe 102 on one side of the base 1, and at least two first connecting ports 101 on the base 1, each first connecting port 101 communicating with both ends of the first liquid guiding pipe 102, and a heat-conducting liquid inside the cavity 302 and the first liquid guiding pipe 102.

[0031] The base 1, cover 2 and intermediate cylinder 3 form a closed cavity structure. Only the Y waveguide component 7 is placed inside the cavity, which reduces the heat radiation and other interference generated by the internal integrated devices and also facilitates the miniaturization of the heat preservation device.

[0032] The inner protrusion 4 raises the position of the Y-waveguide component 7, making the Y-waveguide component 7 closer to the central region of the closed cavity structure, and the temperature closer to the average temperature inside the cavity, making the test more accurate.

[0033] Both the base 1 and the middle cylinder 3 are made of heat-conducting material on the side closest to the closed cavity structure. The liquid temperature in the first liquid guide tube 102 and the clamping cavity 302 can be adjusted by an external temperature controller to conduct heat into the closed cavity structure. The volume of the closed cavity structure is much smaller than that of the temperature chamber. Therefore, the internal temperature is transferred faster and more evenly, making it very suitable for high-precision temperature testing.

[0034] In the preferred embodiment, a temperature and humidity sensor 5 is provided in the center of the intermediate cylinder 3, and the temperature and humidity sensor 5 extends into the intermediate cylinder 3.

[0035] The intermediate cylinder 3 can monitor the temperature and humidity of the environment where the fiber optic ring 6 and the Y waveguide assembly 7 are located, provide correct feedback to the test system, and facilitate real-time adjustment of the temperature of the circulating heat transfer fluid.

[0036] In the preferred embodiment, the base 1 is provided with a fiber outlet hole 103, and the two ends of the fiber outlet hole 103 are respectively connected to the inside of the intermediate cylinder 3 and the outside.

[0037] The fiber optic end of the test system is inserted into the intermediate cylinder 3 through the fiber outlet 103 and welded to the fiber optic ring 6 and the Y-waveguide assembly 7. The small diameter of the fiber outlet 103 does not affect the temperature and humidity inside the intermediate cylinder 3.

[0038] In the preferred embodiment, a central cylinder 104 is provided on the side of the base 1 near the middle cylinder 3. The side wall of the central cylinder 104 is hollow. A second liquid guide tube 106 is provided inside the side wall of the central cylinder 104. The outer diameter of the central cylinder 104 is smaller than the inner diameter of the fiber optic ring 6. The Y waveguide assembly 7 is placed inside the central cylinder 104.

[0039] A shelf 105 is provided at an appropriate height inside the central tube 104. The inner protrusion 4 is placed on the shelf 105, and the Y waveguide assembly 7 is placed on the inner protrusion 4.

[0040] An opening is provided at the lower end of the inner cavity of the side wall of the central cylinder 104, through which the end of the second liquid guide tube 106 can pass.

[0041] In the preferred embodiment, the cover 2 is provided with a first liquid guide tube 102.

[0042] The first liquid guide tube 102 inside the cover body 2 and the second liquid guide tube 106 inside the side wall of the central cylinder 104 are both supplied with heat-conducting liquid.

[0043] When the fiber optic ring 6 is placed inside the intermediate cylinder 3, the central cylinder 104 is inside the fiber optic ring 6, the intermediate cylinder 3 is outside the fiber optic ring 6, the base 1 is below the base 1, and the cover 2 is above the fiber optic ring 6. In this way, each surface of the fiber optic ring 6 is wrapped by the heat source. When the temperature of the heat transfer fluid changes, the temperature of each surface of the fiber optic ring 6 changes synchronously and uniformly, which makes the temperature testing system less erroneous and more accurate.

[0044] Even though the insulation device is smaller in size than a traditional temperature chamber, since the fiber optic ring 6 is placed on the base 1 and does not contact the cover 2 and the intermediate cylinder 3, there is still a large amount of air inside the closed cavity structure formed by the base 1, cover 2 and intermediate cylinder 3. Air has a poor thermal conductivity, so when performing variable temperature tests, the temperature of the closed cavity always lags behind the temperature of the heat transfer fluid. Since the shape precision of the fiber optic ring 6 does not need to be too high during production, it is not practical to directly contact the various surfaces of the fiber optic ring 6 and the base 1, cover 2 and intermediate cylinder 3 with the heat transfer metal. Therefore, in order to improve the temperature response speed inside the closed cavity, it is necessary to minimize the cavity volume and the distance between the heat transfer source and the various surfaces of the fiber optic ring 6.

[0045] In a preferred embodiment, a heat spreader assembly 8 is provided inside the intermediate cylinder 3. The heat spreader assembly 8 includes a bottom frame 802 and a top frame 803. A plurality of heat-conducting columns 801 are arranged circumferentially between the bottom frame 802 and the top frame 803. The heat-conducting columns 801, the bottom frame 802 and the top frame 803 form a cage-like structure. The fiber optic ring 6 is located inside the cage-like structure. The bottom frame 802 is in contact with the base 1 and the top frame 803 is in contact with the cover 2.

[0046] The center of the heat-conducting fin 801 has a through hole with a diameter larger than that of the central cylinder 104.

[0047] The heat-conducting pillars 801, bottom frame 802, and top frame 803 are made of metals with high thermal conductivity, such as copper and aluminum. The bottom frame 802 and top frame 803 absorb the heat from the base 1 and the cover 2 and quickly conduct the heat to each heat-conducting pillar 801. Since each heat-conducting pillar 801 is circumferentially distributed, it is equivalent to increasing the contact area with the air in the cavity, which greatly increases the heat conduction efficiency. In addition, since the heat-conducting pillars 801, bottom frame 802, and top frame 803 occupy the space inside the middle cylinder 3, each heat-conducting pillar 801, bottom frame 802, and top frame 803 is equivalent to a heat source, and the distance from each surface of the fiber optic ring 6 becomes closer, improving the heat conduction efficiency.

[0048] Since the fiber optic rings to be tested by the heat preservation device are of different specifications, and the thickness and inner and outer diameters of the fiber optic rings are different, a cage-like structure is required to adjust accordingly so that the heat source is as close as possible to the surface of the fiber optic ring 6.

[0049] In a preferred embodiment, the bottom frame 802 and the top frame 803 are provided with a plurality of guide grooves 804 along the circumferential direction, and one end of the heat-conducting column 801 is provided with a snap-fit ​​part 805, and the snap-fit ​​part 805 of each heat-conducting column 801 is slidably snapped into the guide groove 804 of the bottom frame 802 or the guide groove 804 of the top frame 803.

[0050] Since the fiber optic ring 6 generally needs to be laid flat during testing, the guide groove 804 is in a horizontal or nearly horizontal state, and the heat-conducting column 801 can slide along the guide groove 804 to any position and stop there in a natural state.

[0051] In the preferred embodiment, the number of guide grooves 804 on each end frame is a multiple of four, and the number of guide grooves 804 on each end frame is twice the number of heat-conducting fins 801. The heat-conducting fins 801 of the bottom end frame 802 and the heat-conducting fins 801 of the top end frame 803 are arranged circumferentially at intervals.

[0052] When the number of heat-conducting fins 801 and guide grooves 804 is a multiple of four, taking one guide groove 804 evenly distributed every ten degrees as an example, there are a total of thirty-six guide grooves 804 and eighteen heat-conducting fins 801 on the bottom frame 802. Every two heat-conducting fins 801 are arranged in a group, and the adjacent groups of heat-conducting fins 801 are spaced twenty degrees apart. The same arrangement is also made on the top frame 803.

[0053] The free ends of the heat-conducting fins 801 of the bottom frame 802 face upwards, and the free ends of the heat-conducting fins 801 of the top frame 803 face downwards. Since each group of heat-conducting fins 801 occupies twenty degrees, and the adjacent groups of heat-conducting fins 801 are spaced twenty degrees apart, the bottom frame 802 and the top frame 803 can be interlocked so that the heat-conducting fins 801 are staggered and inserted into the twenty-degree interval gaps. At this time, the heat-conducting fins 801, the bottom frame 802 and the top frame 803 form a cage-like structure, with one heat-conducting fin 801 evenly distributed every ten degrees.

[0054] Due to the different outer and inner diameters of different fiber optic rings, three usage modes will occur.

[0055] The first method involves moving one of the two heat-conducting pillars 801 in the same group on the same end frame closer to the center and the other closer to the outer edge. This is repeated for each group, so that the heat-conducting pillars 801 on the same end frame form two concentric rings. The bottom end frame 802 and the top end frame 803 are operated in the same way. The fiber optic ring 6 is placed on the bottom end frame 802, with the inner ring heat-conducting pillars 801 close to the inner wall of the fiber optic ring 6 and the outer ring heat-conducting pillars 801 close to the outer wall of the fiber optic ring 6. They are close but do not need to touch. The top end frame 803 is then removed, and the same applies: the inner ring heat-conducting pillars 801 are close to the inner wall of the fiber optic ring 6 and the outer ring heat-conducting pillars 801 are close to the outer wall of the fiber optic ring 6. Together with the bottom end frame 802, they form a cage-like structure that encloses the fiber optic ring 6.

[0056] The second method involves moving all the heat-conducting fins 801 outward to form a ring, and then attaching them from the outside to the inside of the outer wall of the fiber ring 6 when the inner wall of the fiber ring 6 is close to the outer wall of the central cylinder 104 and the outer wall of the fiber ring 6 is much smaller than the inner wall diameter of the central cylinder 3.

[0057] The third scenario involves the outer wall of the fiber optic ring 6 approaching the inner wall of the intermediate cylinder 3, and the inner wall of the fiber optic ring 6 being much larger than the outer wall diameter of the central cylinder 104. In this scenario, all the heat-conducting fins 801 will be pushed inward to form a ring, and will be attached to the inner wall of the fiber optic ring 6 from the inside out.

[0058] In a preferred embodiment, both the base 1 and the cover 2 are provided with lifting frame assemblies 9. Each lifting frame assembly 9 is connected to the bottom frame 802 and the top frame 803 respectively. Each lifting frame assembly 9 is slidably sleeved with the base 1 or the cover 2. Each guide groove 804 of the bottom frame 802 and the top frame 803 is provided with a strip-shaped through groove 806. A coil groove 901 is provided on the side of the lifting frame assembly 9 away from the bottom frame 802 and the top frame 803. The first liquid guide tube 102 is provided in the coil groove 901. A plurality of strip-shaped receiving slots 902 are provided circumferentially on the side of the lifting frame assembly 9 near the bottom frame 802 and the top frame 803. Each strip-shaped receiving slot 902 is aligned with each strip-shaped through groove 806 for the insertion of the heat-conducting column 801. The width of the strip-shaped through groove 806 and the strip-shaped receiving slot 902 is greater than the width of the heat-conducting column 801.

[0059] The coil trough 901 has a cap 10 at the open end to seal the first liquid guide tube 102. The side wall of the coil trough 901 has at least two openings for the two ends of the first liquid guide tube 102 to extend out.

[0060] The lifting frame assembly 9 can slide up and down to change the distance between the bottom frame 802 and the top frame 803, so that the bottom frame 802 and the top frame 803 are as close as possible to the upper and lower end faces of the fiber optic ring 6. Combined with the sliding function of the heat-conducting column plate 801, the space actually used by the cage structure to place the fiber optic ring 6 can be freely adjusted.

[0061] In a preferred embodiment, a clamping plate 11 and a clamping screw 12 are provided inside the base 1 and the cover 2. One end of the clamping plate 11 is used to press against the lifting frame assembly 9, and the clamping screw 12 is threadedly connected to the base 1 or the cover 2. The end of the clamping screw 12 presses against the back side of the clamping plate 11.

[0062] The locking plate 11 and the locking screw 12 work together to lock the lifting frame assembly 9 at any height.

[0063] Example 2: A high-precision fiber optic ring temperature testing component includes a base, a windproof and heat-insulating layer, a temperature and humidity monitoring unit, a Y-waveguide device, and an information unit for acquiring and testing its parameters.

[0064] The reasons for choosing liquid medium for conduction are: 1. Liquid medium can provide more uniform temperature change and insulation for the product; 2. The amount of liquid medium required for testing a single fiber optic ring is relatively small; 3. The heating and cooling rates are faster, meeting the testing environment requirements of different conditions.

[0065] The base is hollow at the bottom, allowing for uniform heating of the entire module's bottom during temperature changes. Simultaneously, due to the unique structure of the fiber optic rings, the central temperature remains consistent even within the grooved opening. Different fiber optic rings and add-on products are mounted on the base, with pigtails led to the Y-waveguide device. These pigtails are then led out of the base via pre-drilled ports to connect to the data acquisition and testing unit, light source, and other devices.

[0066] The temporary module cylindrical tube has a medium inlet at the lower port and an outlet at the upper port. The internal space is stepped, which allows the temperature-changing medium to rise and be discharged in a stepped manner, realizing the temperature change and insulation of the liquid medium in the gap layer. The entire cylindrical tube surrounds the insulation layer to reduce external temperature changes. The top cover has a reserved space for placing desiccant to meet the humidity requirements. A temperature and humidity sensor is installed at the center hole of the top cover. The temperature sensor is connected to the information acquisition terminal via an electrical signal for real-time monitoring. The temperature and rate of medium entry are then adjusted by the temperature control system. The bottom is connected to a unique shock-absorbing platform, and all internal connections are locked with screws. A sealing ring is set in the inner ring, and the entire module system is sealed to ensure the stability of the pressure and humidity of the test environment, so as to achieve accurate test results and inspection environment. The entire testing system only requires connecting the fiber optic ring to be tested and the pigtail-related components of the test product, separating the base from the temporary module's circular barrel. Other components do not need to be disassembled or reassembled in subsequent tests, except for the initial installation or replacement of components, greatly improving convenience.

[0067] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A thermal insulation testing device for high-precision temperature testing of fiber optic rings, characterized in that: The system includes a base (1), a middle cylinder (3) on the base (1), a cover (2) at one end of the middle cylinder (3) away from the base (1), an inner protrusion (4) in the center of the base (1) inside the middle cylinder (3), a Y-waveguide assembly (7) placed on the inner protrusion (4), an optical fiber ring (6) placed inside the middle cylinder (3), the Y-waveguide assembly (7) connected to the optical fiber ring (6), a clamping cavity (302) on the side wall of the middle cylinder (3), at least two second connecting ports (301) on the middle cylinder (3), the second connecting ports (301) connected to the clamping cavity (302), a first liquid guide tube (102) on one side of the base (1), at least two first connecting ports (101) on the base (1), each first connecting port (101) connected to both ends of the first liquid guide tube (102), and a heat-conducting liquid inside the clamping cavity (302) and the first liquid guide tube (102). A central cylinder (104) is provided on the side of the base (1) near the middle cylinder (3). The side wall of the central cylinder (104) is hollow. A second liquid guide tube (106) is provided inside the side wall of the central cylinder (104). The outer diameter of the central cylinder (104) is smaller than the inner diameter of the fiber optic ring (6). The Y waveguide assembly (7) is placed inside the central cylinder (104). The cover (2) is provided with a first liquid guide tube (102); The intermediate cylinder (3) is provided with a heat spreader assembly (8). The heat spreader assembly (8) includes a bottom frame (802) and a top frame (803). Multiple heat-conducting columns (801) are arranged circumferentially between the bottom frame (802) and the top frame (803). The heat-conducting columns (801), the bottom frame (802) and the top frame (803) form a cage structure. The fiber optic ring (6) is located in the cage structure. The bottom frame (802) is in contact with the base (1) and the top frame (803) is in contact with the cover (2).

2. The heat preservation testing device for high-precision temperature testing of fiber optic rings according to claim 1, characterized in that: A temperature and humidity sensor (5) is provided in the center of the intermediate cylinder (3), and the temperature and humidity sensor (5) extends into the intermediate cylinder (3).

3. The heat preservation testing device for high-precision temperature testing of fiber optic rings according to claim 1, characterized in that: The base (1) is provided with a fiber outlet hole (103), and the two ends of the fiber outlet hole (103) are connected to the inside of the intermediate cylinder (3) and the outside.

4. The heat preservation testing device for high-precision temperature testing of fiber optic rings according to claim 1, characterized in that: The bottom frame (802) and the top frame (803) are provided with multiple guide grooves (804) along the circumferential direction. One end of the heat-conducting column (801) is provided with a snap-fit ​​part (805). The snap-fit ​​part (805) of each heat-conducting column (801) is slidably snapped into the guide groove (804) of the bottom frame (802) or the guide groove (804) of the top frame (803).

5. The insulation testing device for high-precision temperature testing of fiber optic rings according to claim 4, characterized in that: The number of guide grooves (804) on each end frame is a multiple of four, and the number of guide grooves (804) on each end frame is twice the number of heat-conducting fins (801). The heat-conducting fins (801) of the bottom end frame (802) and the heat-conducting fins (801) of the top end frame (803) are arranged circumferentially at intervals.

6. The insulation testing device for high-precision temperature testing of fiber optic rings according to claim 5, characterized in that: Both the base (1) and the cover (2) are equipped with lifting frame assemblies (9). Each lifting frame assembly (9) is connected to the bottom frame (802) and the top frame (803) respectively. Each lifting frame assembly (9) is slidably sleeved with the base (1) or the cover (2). Each guide groove (804) of the bottom frame (802) and the top frame (803) is provided with a strip-shaped through groove (806). A coil groove is provided on the side of the lifting frame assembly (9) away from the bottom frame (802) and the top frame (803). 901), the first liquid guide tube (102) is located in the coil groove (901), and the lifting frame assembly (9) has a plurality of strip-shaped receiving slots (902) along the circumferential direction on the side near the bottom end frame (802) and the top end frame (803). Each strip-shaped receiving slot (902) is aligned with each strip-shaped through groove (806) for the insertion of the heat-conducting column (801). The width of the strip-shaped through groove (806) and the strip-shaped receiving slot (902) is greater than the width of the heat-conducting column (801).

7. The insulation testing device for high-precision temperature testing of fiber optic rings according to claim 6, characterized in that: The base (1) and the cover (2) are provided with a top clamping plate (11) and a top clamping screw (12). One end of the top clamping plate (11) is used to attach to the lifting frame assembly (9). The top clamping screw (12) is threaded to the base (1) or the cover (2). The end of the top clamping screw (12) is pressed against the back side of the top clamping plate (11).

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