Optical fiber loop temperature performance testing device

Abstract

The application provides a fiber ring temperature performance testing device, which comprises a high-low temperature box and a constant temperature box. The high-low temperature box is internally provided with a rotatable first turntable, and the constant temperature box is internally provided with a rotatable second turntable. The second turntable is used for placing a test host. A transmission central shaft assembly is connected between the first turntable and the second turntable, so that the first turntable and the second turntable synchronously rotate. The first turntable is provided with a fiber ring support, and the fiber ring support is used for placing a measured fiber ring. The first turntable is further provided with an isolation cover for buckling the measured fiber ring. The problem that the test system itself is affected by temperature and is wound dry, thereby affecting the test precision, is solved.

Description

Technical Field

[0001] This invention relates to the field of fiber optic ring testing, and in particular to a device for testing the temperature performance of fiber optic rings. Background Technology

[0002] The fiber optic ring is the core component of a fiber optic angle sensor (also known as a fiber optic gyroscope), and high-precision fiber optic gyroscopes rely heavily on high-quality fiber optic rings. In practical applications, any interference with the fiber optic ring will cause non-reciprocity in the forward and reverse propagating light within the ring, leading to bias drift and reduced accuracy. The main interferences include ambient temperature interference, ambient magnetic field interference, and vibration interference, with ambient temperature having the most significant impact on the measurement accuracy. To ensure the full-temperature accuracy of the fiber optic gyroscope and improve its yield rate, conducting temperature tests on the wound fiber optic ring sample before installation into the fiber optic gyroscope and obtaining its temperature parameters is a crucial step in fiber optic ring production.

[0003] Because optical fibers are extremely thin and colorless / transparent, visual inspection alone is insufficient to effectively assess the winding quality of fiber optic rings. Currently, fiber optic gyroscope research institutions and manufacturers primarily use a constant-temperature chamber to heat the fiber optic gyroscope and monitor the zero-bias change to indirectly evaluate the temperature performance of the fiber optic ring. Related patents, such as CN106441369A which proposes a testing system for fiber optic rings, and CN115371957A which proposes a temperature performance testing and analysis system for fiber optic rings, also mainly focus on evaluating the fiber optic ring by analyzing the zero-bias (zero drift) curve as a function of temperature. However, across the entire temperature range, the temperature stability of the scaling factor is one of the important indicators affecting the performance of fiber optic gyroscope inertial systems. For example, the stress distribution problem of the fiber optic ring may appear normal during zero-drift testing, but will reveal nonlinearity in scaling factor testing; furthermore, there is the influence of transient temperature processes. Zero drift is mainly assessed based on steady-state values, while the scaling factor is sensitive to the rate of temperature change. Especially in high-angular-rate or high-precision applications, the scaling factor error of fiber optic gyroscopes can even exceed the zero-bias drift error. Therefore, evaluation methods relying solely on zero-bias analysis are incomplete and even misleading. This necessitates the development of a system to measure the scaling factor variation characteristics across the entire temperature range. This is a necessary requirement and a key technological breakthrough direction for filling existing technological gaps, achieving comprehensive evaluation of the temperature performance of fiber optic gyroscopes, and meeting the demands of high-end applications.

[0004] Current fiber optic gyroscope scaling factor testing primarily follows the GJB 2426A-2004 standard, typically selecting several typical discrete temperature points for scaling factor testing. This method requires frequent starting and stopping of the rate turntable, resulting in a lengthy and inefficient operation. Furthermore, as accuracy requirements increase with the number of test temperature points, testing time and costs significantly increase. Moreover, current technology and system architecture involve installing the fiber optic ring within the fiber optic gyroscope system for testing. When the entire gyroscope system is placed in a temperature chamber turntable to test the fiber optic ring, its temperature characteristics are coupled with the temperature drift of subsystems such as the light source, detector, and modulation circuit. The test data reflects the overall system performance. Other components of the fiber optic gyroscope (including the light source, circuitry, Y-waveguide, and passive optical devices) are also placed in the temperature chamber. These components experience operational disturbances upon heating, making it impossible to distinguish whether the temperature-induced performance changes originate from the fiber optic ring itself, the temperature drift of other electronic components, or system control errors. Summary of the Invention

[0005] This invention provides a fiber optic ring temperature performance testing device, which solves the problem that the testing system itself is affected by temperature interference during fiber optic ring temperature testing, thus affecting the testing accuracy.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a fiber optic ring temperature performance testing device, including a high and low temperature chamber and a constant temperature chamber. The high and low temperature chamber is provided with a rotatable first turntable, and the constant temperature chamber is provided with a rotatable second turntable. The second turntable is used to place the test host. A transmission shaft assembly is connected between the first turntable and the second turntable so that the first turntable and the second turntable rotate synchronously. The first turntable is provided with a fiber optic ring bracket for placing the fiber optic ring to be tested. The first turntable is also provided with an isolation cover to hold the fiber optic ring to be tested.

[0007] In a preferred embodiment, the transmission shaft assembly includes a lower connecting shaft and an upper connecting shaft. The upper end of the upper connecting shaft is used to connect to the test host. The lower connecting shaft has multiple vertical strip grooves along its circumference. The first turntable has a central hole, and the inner wall of the central hole has multiple protruding parts along its circumference, which are engaged in the strip grooves.

[0008] In the preferred embodiment, the convex part is slidably connected to the strip groove. The high and low temperature chamber is equipped with a base frame and a middle frame. The base frame is equipped with a marble vibration damping base, the marble vibration damping base is equipped with a vibration isolation pad, the vibration isolation pad is equipped with a turntable motor, the turntable motor is connected to the lower end of the transmission shaft assembly, the middle frame is equipped with a turntable bracket, the turntable bracket is equipped with a slip ring, and the slip ring supports the first turntable.

[0009] In the preferred embodiment, multiple fiber optic ring supports are provided circumferentially on the first turntable.

[0010] In a preferred embodiment, the transmission shaft assembly further includes an intermediate connecting shaft located between the lower connecting shaft and the upper connecting shaft. The intermediate connecting shaft and the upper connecting shaft are hollow structures. The sidewall of the intermediate connecting shaft is provided with multiple through vertical grooves along the circumference. The ends of the intermediate connecting shaft and the upper connecting shaft are connected and internally connected. The high and low temperature chamber is connected to the interior of the intermediate connecting shaft through the through vertical grooves, and the constant temperature chamber is connected to the interior of the upper connecting shaft.

[0011] In a preferred embodiment, a first sliding hole is provided inside the intermediate connecting shaft, and an intermediate moving device is provided inside the first sliding hole. The intermediate moving device includes a first sliding plug, which is slidably connected to the inner wall of the first sliding hole. The side wall of the first sliding plug is provided with multiple lateral protrusions along the circumferential direction. Each lateral protrusion is stuck in a through vertical groove. A pigtail tube is provided in the lateral protrusion. The pigtail of the fiber optic ring under test passes through the pigtail tube and enters the first sliding hole, and its upper end is connected to the test host.

[0012] In the preferred embodiment, the lateral protrusion is slidably connected to the through vertical groove, the upper end of the first sliding plug is also provided with a connecting rod, the upper end of the connecting rod is provided with a second sliding plug, the upper end of the tail fiber tube passes through the second sliding plug, the upper connecting shaft is provided with a second sliding hole, and the second sliding plug and the second sliding hole are slidably sleeved together.

[0013] In the preferred embodiment, the test host includes a light source, a multiplexer, a Y-waveguide, and a photodetector. The light emitted by the light source is output to the Y-waveguide for polarization after passing through the multiplexer. Then, it is split into two beams of light that travel in opposite directions in the fiber optic ring under test, traversing the entire ring before returning to the Y-waveguide to form an interference light signal. The interference light signal is then transmitted to the photodetector via the multiplexer.

[0014] In a preferred embodiment, the test host also includes a modulation and demodulation module, whereby the optical signal is converted into an electrical signal by a photodetector and demodulated by the modulation and demodulation module to obtain the digital signal of the fiber optic ring gyroscope angular rate.

[0015] In a preferred embodiment, a light source driving module is also included, which comprises a light source driving circuit and a temperature control circuit.

[0016] The beneficial effects of this invention are as follows: The fiber optic ring is placed separately in the temperature chamber, and automatic full-temperature scaling factor testing is achieved synchronously through unidirectional uniform rotation. The engineering implementation is simple and efficient, eliminating the influence of temperature drift from components such as the light source and circuitry. Scale factor change detection is completed under continuous temperature conditions, overcoming the coverage blind spots of discrete temperature measurements and effectively identifying changes in the scaling factor across the entire temperature range. The testing system simultaneously supports zero-bias temperature characteristic testing, providing irreplaceable full-dimensional performance calibration for fiber optic ring screening. The transmission shaft assembly has a hollow structure, facilitating the connection between the pigtail of the testing host and the fiber optic ring, protecting the fiber. The second sliding hole serves as a temporary space for redundant pigtails, and the intermediate moving device acts as a temporary fixing device for the pigtail distribution box, avoiding repeated fiber threading during testing and simplifying the testing process and reducing operational difficulty. The first turntable is not directly connected to the turntable motor, reducing the impact of motor vibration on the fiber optic ring testing. 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 a high and low temperature chamber and a constant temperature chamber.

[0019] Figure 2 This is a diagram of the internal testing equipment layout.

[0020] Figure 3 This is a structural diagram of the transmission shaft assembly and drive motor.

[0021] Figure 4 This is an exploded view of the transmission shaft assembly.

[0022] Figure 5 This is a structural diagram of the intermediate moving device.

[0023] Figure 6 This is a sectional view of the transmission shaft assembly.

[0024] Figure 7 This is a schematic diagram of the testing system of the present invention.

[0025] Figure 8 This is a schematic diagram illustrating the effect of gyroscope zero bias on scale factor error at different rotational speeds.

[0026] In the diagram: 1. High and low temperature chamber; 101. Base frame; 102. Middle frame; 2. Constant temperature chamber; 3. First turntable; 301. Central hole; 302. Second turntable; 4. Fiber optic ring support; 5. Fiber optic ring under test; 6. Test host; 7. Light source; 701. Multiplexer; 702. Y-waveguide; 703. Photodetector; 704. Modulation and demodulation module; 705. Light source drive module; 706. Transmission shaft assembly; 8. Lower connecting shaft; 801. Middle connecting shaft; 802. Upper connecting shaft 803; strip groove 804; through vertical groove 805; first sliding hole 806; second sliding hole 807; isolation cover 9; turntable motor 10; turntable bracket 11; slip ring 1101; marble vibration damping base 12; vibration damping pad 13; hollow frame 14; intermediate moving device 15; first sliding plug part 1501; lateral protrusion block 1502; fiber optic tube 1503; connecting rod 1504; second sliding plug part 1505; computer 16. Detailed Implementation

[0027] Example 1: like Figure 1-7 A fiber optic ring temperature performance testing device includes a high and low temperature chamber 1 and a constant temperature chamber 2. The high and low temperature chamber 1 is equipped with a rotatable first turntable 3, and the constant temperature chamber 2 is equipped with a rotatable second turntable 4. The second turntable 4 is used to place the test host 7. A transmission shaft assembly 8 is connected between the first turntable 3 and the second turntable 4 so that the first turntable 3 and the second turntable 4 rotate synchronously. The first turntable 3 is equipped with a fiber optic ring bracket 5, which is used to place the fiber optic ring 6 to be tested. The first turntable 3 is also equipped with an isolation cover 9 to hold the fiber optic ring 6 to be tested.

[0028] The isolation enclosure 9 and the first turntable 3 form an independent test space to prevent the cold and hot air blown out of the high and low temperature chamber 1 from disturbing the airflow near the fiber optic ring 6 under test and causing uncontrollable temperature fluctuations.

[0029] The pigtail of the fiber optic ring 6 under test is connected to the test host 7 through a hollow channel within the transmission shaft assembly 8. The first turntable 3 and the second turntable 4 are arranged coaxially, and the fiber optic ring 6 under test is eccentrically positioned on the first turntable 3. During testing, the fiber optic ring 6 under test and the test host 7 rotate synchronously, preventing fiber entanglement.

[0030] The temperature inside the constant temperature chamber 2 is adjusted to be close to room temperature and kept constant, while the temperature inside the high and low temperature chamber 1 is adjusted to the test temperature. Since the temperature of the test host 7 remains constant regardless of changes in the test temperature inside the high and low temperature chamber 1, system errors caused by temperature variations in the test host 7 itself are eliminated.

[0031] In a preferred embodiment, the transmission shaft assembly 8 includes a lower connecting shaft 801 and an upper connecting shaft 803. The upper end of the upper connecting shaft 803 is used to connect to the test host 7. The lower connecting shaft 801 has a plurality of vertical strip grooves 804 along its circumference. The first turntable 3 has a central hole 301. The inner wall of the central hole 301 has a plurality of protruding parts 302 along its circumference, which are engaged in the strip grooves 804.

[0032] The convex part 302 transmits torque from the transmission shaft assembly 8, driving the first turntable 3 to rotate.

[0033] In the preferred embodiment, the protruding part 302 is slidably connected to the strip groove 804. The high and low temperature chamber 1 is provided with a base frame 101 and a middle frame 102. The base frame 101 is provided with a marble vibration damping base 12. The marble vibration damping base 12 is provided with a vibration isolation pad 13. The vibration isolation pad 13 is provided with a turntable motor 10. The turntable motor 10 is connected to the lower end of the transmission shaft assembly 8. The middle frame 102 is provided with a turntable bracket 11. The turntable bracket 11 is provided with a slip ring 1101. The slip ring 1101 supports the first turntable 3.

[0034] The slip ring 1101 can be made of ceramic or Teflon to reduce the coefficient of friction and improve wear resistance.

[0035] Marble has good vibration absorption properties. The turntable motor 10 is mounted on the marble vibration damping base 12 and equipped with vibration isolation pads 13 to reduce the impact of vibration from the turntable motor 10 during operation on the high and low temperature chamber 1. The middle frame 102 is not in direct contact with the turntable motor 10. Therefore, the vibration transmitted to the first turntable 3 by the turntable bracket 11, which serves as the supporting base for the first turntable 3, will not have a significant impact on the test.

[0036] In the preferred embodiment, the first turntable 3 is provided with multiple fiber optic ring supports 5 along its circumferential direction.

[0037] Multiple fiber optic ring supports 5 are evenly distributed around the first turntable 3 at circumferential angles.

[0038] The test host 7 has multiple sets of pigtail connection terminals, which can test multiple fiber optic rings 6 at the same time, improving test efficiency.

[0039] In a preferred embodiment, the transmission shaft assembly 8 further includes an intermediate connecting shaft 802 disposed between the lower connecting shaft 801 and the upper connecting shaft 803. The intermediate connecting shaft 802 and the upper connecting shaft 803 are hollow structures. The side wall of the intermediate connecting shaft 802 is provided with a plurality of through vertical grooves 805 along the circumference. The ends of the intermediate connecting shaft 802 and the upper connecting shaft 803 are connected and internally connected. The high and low temperature chamber 1 is internally connected to the intermediate connecting shaft 802 through the through vertical grooves 805, and the constant temperature chamber 2 is internally connected to the upper connecting shaft 803.

[0040] The intermediate connecting shaft 802, the upper connecting shaft 803, the hollow structure, and the through vertical groove 805 form a fiber channel. The pigtail passes through the through vertical groove 805, the intermediate connecting shaft 802, and the upper connecting shaft 803 from the fiber ring 6 under test, and finally reaches the constant temperature chamber 2 to connect with the pigtail connection end of the test host 7.

[0041] During fiber optic ring testing, each fiber optic ring needs to be fused with the pigtail connection end of the test host 7. After the test is completed, the fused portion is cut off. In the traditional solution, the test host 7 is placed in the high and low temperature chamber 1, and each fiber optic ring is tested at a time, with one fusion splice completed in the high and low temperature chamber 1. However, in this case, each pigtail needs to pass through the transmission shaft assembly 8 to connect with the test host 7. Furthermore, since multiple sets of fiber optic rings 6 can be tested, multiple pigtails need to be passed through each test, which is difficult, time-consuming, and the multiple pigtails are easy to get confused.

[0042] In a preferred embodiment, a first sliding hole 806 is provided in the intermediate connecting shaft 802, and an intermediate moving device 15 is provided in the first sliding hole 806. The intermediate moving device 15 includes a first sliding plug 1501, which is slidably connected to the inner wall of the first sliding hole 806. A plurality of lateral protrusions 1502 are provided on the side wall of the first sliding plug 1501 in the circumferential direction. Each lateral protrusion 1502 is stuck in the through vertical groove 805. A pigtail tube 1503 is provided in the lateral protrusion 1502. The pigtail of the fiber optic ring 6 under test passes through the pigtail tube 1503 and enters the first sliding hole 806, and its upper end is connected to the test host 7.

[0043] Each lateral protrusion 1502 is engaged in the through vertical groove 805 as a rotary transmission structure.

[0044] The two pigtails of each fiber ring 6 under test pass through different pigtail tubes 1503 to prevent confusion.

[0045] The connection end of the test host 7 is left with a certain length. After being inserted into the pigtail tube 1503, it is fixed to the port of the pigtail tube 1503 with tape. The tape is then removed, and the pigtail connection end is pulled out and fused to the pigtail of the fiber optic ring 6 under test. After the test is completed, the fused section is cut off, and the cut end is fixed to the port of the pigtail tube 1503 with tape for future use.

[0046] Since the spliced ​​section of the pigtail connector on the test host 7 needs to be cut off after each test, the reserved pigtail connector becomes shorter and shorter after repeated use. Therefore, a longer pigtail connector is needed to meet the requirements of long-term use. However, the reserved fiber will be exposed in the constant temperature chamber 2 for a long time, and may be damaged during manual operation. Furthermore, when the pigtail connector is used up and replaced, it still needs to be passed through the transmission shaft assembly 8, which is quite troublesome.

[0047] In the preferred embodiment, the lateral protrusion 1502 is slidably connected to the through vertical groove 805, the upper end of the first sliding plug 1501 is also provided with a connecting rod 1504, the upper end of the connecting rod 1504 is provided with a second sliding plug 1505, the upper end of the tail fiber tube 1503 passes through the second sliding plug 1505, the upper connecting shaft 803 is provided with a second sliding hole 807, and the second sliding plug 1505 and the second sliding hole 807 are slidably sleeved together.

[0048] The upper end of the second sliding hole 807 is provided with a hollow frame 14. The center of the lower plate of the hollow frame 14 is provided with a through hole to facilitate fiber routing. The optical fiber passes through the side of the hollow frame 14. The test host 7 is installed on the upper plate of the hollow frame 14, and the optical fiber is connected to the test host 7.

[0049] When the finger moves the lateral protrusion 1502, the first sliding plug 1501 can move up and down in the first sliding hole 806. When the first sliding plug 1501 moves down to the bottom, the second sliding hole 807 serves as a storage space for the fiber optic connection end of the test host 7, which can reserve a longer fiber optic connection end.

[0050] The fiber optic connector is inserted from the top of the fiber optic tube 1503. Since the diameter of the fiber optic tube 1503 is larger than that of the fiber optic cable and the inner wall is smooth, the fiber optic connector can easily pass out from the bottom of the fiber optic tube 1503.

[0051] After the fiber optic connector is used up, the first sliding plug 1501 is moved to the top, the second sliding plug 1505 is almost flush with the upper end of the second sliding hole 807, and the upper end of the fiber optic tube 1503 is visible, making it very convenient to thread the fiber.

[0052] During the measurement process, the fiber optic loop operates in the manner of a fiber optic gyroscope. The test host 7 consists of two parts: a circuit and an optical path. The circuit subsystem includes a light source drive module 706 and a modulation / demodulation module 705.

[0053] The signal modulation and demodulation module 705 consists of a preamplifier, filter, AD sampling circuit, a core data processing logic chip circuit, and a signal modulation and feedback unit, DA feedback circuit. The optical path includes a light source 701, a multiplexer 702, a Y-waveguide 703, and a photodetector 704. The light emitted from the light source 703 is transmitted to the multiplexer 702, and then output to the polarizer of the Y-waveguide 703 for polarization. The light is then split into two beams that travel in opposite directions. The two beams travel in opposite directions in the fiber optic loop 6 under test, traversing the entire loop before returning to the Y-waveguide 703 to form an interference light signal. The interference light signal is transmitted to the photodetector 704 via the coupler for photoelectric conversion to form an electrical signal. The electrical signal is demodulated by the modulation and demodulation circuit 705 to obtain the digital signal of the fiber optic loop gyroscope angular rate, and the data is transmitted to the computer 16 in real time. The computer 16 synchronously collects the temperature data of the temperature chamber, dynamically plots the temperature change rate curve, zero-bias curve, zero-drift value, and scaling factor, and realizes a full-dimensional intrinsic evaluation of the temperature performance of the fiber optic loop.

[0054] Example 2: Currently, medium- and high-precision fiber optic gyroscopes all employ a fully digital closed-loop fiber optic gyroscope design. The output of a fiber optic gyroscope can be expressed as: Ω=Ω0+K SF * ω(1) In the formula: Ω0 is the inherent zero bias of the fiber optic gyroscope, ω is the input rotational speed of the gyroscope, and K SF Let be the scaling factor of the fiber optic gyroscope. With the sensitive axis of the fiber optic gyroscope pointing upwards and fixed on a uniformly rotating single-axis turntable, the output scaling factor test error caused by zero bias can be expressed as: ΔK SF = Ω0 / ω(2) According to formula (2), append Figure 8 The influence curves of the gyroscope's inherent zero bias on the scaling factor test at different rotational speeds are presented. Typically, the inherent zero bias of medium-to-high precision fiber optic gyroscopes is below 0.1° / h; therefore, when the turntable speed is greater than 60° / s, its impact on the scaling factor error is less than 0.5 x 10⁻⁶. When the fiber optic gyroscope rotates at a relatively high constant speed, the change in the gyroscope output represents the temperature-induced change in the scaling factor.

[0055] This pioneering approach to full-temperature scaling factor testing of fiber optic rings, independent of the gyroscope assembly, completely eliminates the intrinsic characteristic confusion caused by temperature drift coupling between the light source and circuitry in traditional solutions. Based on a rigid coupling and synchronous rotation design of the internal and external equipment of the temperature chamber, zero relative displacement of the fiber optic pigtail is achieved. Eliminating asymmetric stress errors, the fiber optic ring can be directly and accurately measured across the entire temperature range (-55℃ to +125℃) without integrating it into the gyroscope assembly. Combining unidirectional uniform rotation with programmable continuous temperature control, zero-bias / scaling factor temperature profiles can be obtained without blind spots in a single operation, significantly improving efficiency compared to the discrete-point method. This provides a high-precision, low-cost, and engineering-friendly standardized screening solution for mass production of fiber optic rings.

[0056] 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 fiber optic ring temperature performance testing device, characterized in that: The test chamber includes a high and low temperature chamber (1) and a constant temperature chamber (2). The high and low temperature chamber (1) is equipped with a rotatable first turntable (3), and the constant temperature chamber (2) is equipped with a rotatable second turntable (4). The second turntable (4) is used to place the test host (7). A transmission shaft assembly (8) is connected between the first turntable (3) and the second turntable (4) so ​​that the first turntable (3) and the second turntable (4) rotate synchronously. The first turntable (3) is equipped with a fiber optic ring bracket (5), which is used to place the fiber optic ring under test (6). The first turntable (3) is also equipped with an isolation cover (9) to hold the fiber optic ring under test (6). The first turntable (3) has multiple fiber optic ring supports (5) arranged circumferentially along its upper edge. The intermediate connecting shaft (802) is provided with a first sliding hole (806), and the first sliding hole (806) is provided with an intermediate moving device (15). The intermediate moving device (15) includes a first sliding plug (1501), which is slidably connected to the inner wall of the first sliding hole (806). The side wall of the first sliding plug (1501) is provided with a plurality of lateral protrusions (1502) along the circumferential direction. Each lateral protrusion (1502) is stuck in the through vertical groove (805). The lateral protrusion (1502) is provided with a pigtail tube (1503). The pigtail of the fiber ring (6) under test passes through the pigtail tube (1503) and enters the first sliding hole (806), and its upper end is connected to the test host (7). The lateral protrusion (1502) is slidably connected to the through vertical groove (805). The upper end of the first sliding plug (1501) is also provided with a connecting rod (1504). The upper end of the connecting rod (1504) is provided with a second sliding plug (1505). The upper end of the tail fiber tube (1503) passes through the second sliding plug (1505). The upper connecting shaft (803) is provided with a second sliding hole (807). The second sliding plug (1505) and the second sliding hole (807) are slidably connected.

2. The fiber optic ring temperature performance testing device according to claim 1, characterized in that: The transmission shaft assembly (8) includes a lower connecting shaft (801) and an upper connecting shaft (803). The upper end of the upper connecting shaft (803) is used to connect to the test host (7). The lower connecting shaft (801) has multiple vertical strip grooves (804) along the circumferential direction. The first turntable (3) has a central hole (301). The inner wall of the central hole (301) has multiple protruding parts (302) along the circumferential direction. The protruding parts (302) are locked in the strip grooves (804).

3. The fiber optic ring temperature performance testing device according to claim 2, characterized in that: The protruding part (302) is slidably connected to the strip groove (804). The high and low temperature chamber (1) is provided with a base frame (101) and a middle frame (102). The base frame (101) is provided with a marble vibration damping base (12). The marble vibration damping base (12) is provided with a vibration isolation pad (13). The vibration isolation pad (13) is provided with a turntable motor (10). The turntable motor (10) is connected to the lower end of the transmission shaft assembly (8). The middle frame (102) is provided with a turntable bracket (11). The turntable bracket (11) is provided with a slip ring (1101). The slip ring (1101) supports the first turntable (3).

4. The fiber optic ring temperature performance testing device according to claim 1, characterized in that: The transmission shaft assembly (8) also includes an intermediate connecting shaft (802) located between the lower connecting shaft (801) and the upper connecting shaft (803). The intermediate connecting shaft (802) and the upper connecting shaft (803) are hollow structures. The side wall of the intermediate connecting shaft (802) is provided with multiple through vertical grooves (805) along the circumference. The ends of the intermediate connecting shaft (802) and the upper connecting shaft (803) are connected and internally connected. The high and low temperature chamber (1) is internally connected to the intermediate connecting shaft (802) through the through vertical grooves (805), and the constant temperature chamber (2) is internally connected to the upper connecting shaft (803).

5. The fiber optic ring temperature performance testing device according to claim 1, characterized in that: The test host (7) includes a light source (701), a multiplexer (702), a Y-waveguide (703), and a photodetector (704). The light emitted by the light source (701) is output to the Y-waveguide (703) after passing through the multiplexer (702) and being polarized. Then, it is split into two beams of light that travel in opposite directions in the fiber optic ring (6) under test. After traversing the entire ring, the beams return to the Y-waveguide (703) to form an interference light signal. The interference light signal is transmitted to the photodetector (704) through the multiplexer (702).

6. The fiber optic ring temperature performance testing device according to claim 5, characterized in that: The test host (7) also includes a modulation and demodulation module (705). The optical signal is converted into an electrical signal by a photodetector (704) and demodulated by the modulation and demodulation module (705) to obtain the digital signal of the fiber optic ring gyroscope angular rate.

7. The fiber optic ring temperature performance testing device according to claim 5, characterized in that: It also includes a light source driving module (706), which includes a light source driving and temperature control circuit.

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