A temperature testing system for fiber optic gyroscope fiber ring and its use method

Abstract

The invention discloses a temperature testing system for an optical fiber ring of an optical fiber gyroscope and a method for using the system. The system comprises an optical fiber ring testing device arranged in a temperature box, and an optical path signal processing device, a circuit signal processing device and a data acquisition and processing device arranged outside the temperature box; the optical fiber ring testing device comprises a lower cover, an adhesive transition plate, an upper cover, a Y-waveguide optical integrator and a temperature sensor; the optical path signal processing device comprises an optical fiber coupler, a light source and a detector; the circuit signal processing device comprises a temperature sensor power supply module, a temperature sensor temperature signal acquisition module, an optical fiber ring signal processing module and a data transmission module; the data acquisition and processing device comprises a data acquisition module, a data storage module and a data processing module; the system can meet the needs of various temperature environments and can reflect the influence of the thermal design of the optical fiber gyroscope shell itself on the temperature performance of the optical fiber ring, and the method for using the system is simple and easy to implement, and the optical fiber ring is not easily damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature testing of an optical fiber ring of an optical fiber gyroscope, and in particular to a temperature testing system for an optical fiber ring of an optical fiber gyroscope and a use method thereof. Background Art

[0002] Fiber optic gyroscope is a fiber optic angular velocity sensor based on the principle of Sagnac effect. It has the advantages of no mechanical moving parts, no warm-up time, insensitivity to acceleration, wide dynamic range, digital output, and small size. It is one of the mainstream gyroscopes currently used in inertial navigation systems and has been widely used in vehicles, ships, aircraft, spacecraft and other carriers.

[0003] The fiber ring is the core component of the fiber optic gyroscope, and its accuracy directly determines the final accuracy of the fiber optic gyroscope. Any interference to the fiber ring will cause the non-reciprocity of the forward and reverse transmission light in the fiber ring, causing the fiber optic gyroscope to produce bias drift and reduce the accuracy of the fiber optic gyroscope. Among them, the influence of ambient temperature on the measurement accuracy of the fiber optic gyroscope is the most obvious. In order to ensure the full temperature accuracy of the fiber optic gyroscope and improve the qualified rate of the fiber optic gyroscope, it is an important link in the production of the fiber ring to conduct a temperature test on the fiber ring to evaluate its temperature index before assembling the fiber optic gyroscope.

[0004] Regarding the temperature test of the fiber optic ring of a fiber optic gyroscope, the published patent CN100538309C proposes an online device test device for the fiber optic ring in a fiber optic gyroscope; the published patent CN111964659A proposes a fiber optic gyroscope fiber optic ring temperature test and evaluation system. Although these two technical solutions provide solutions and standards for the fiber optic gyroscope fiber optic ring temperature test, both are limited to the solution of the fiber optic gyroscope fiber optic ring temperature test, but do not mention the device for the fiber optic gyroscope fiber optic ring temperature test, resulting in the lack of corresponding devices to implement the above fiber optic gyroscope fiber optic ring temperature test in actual applications.

[0005] Therefore, the device used for the temperature test of the fiber optic ring of the fiber optic gyroscope is the core component of the temperature test of the fiber optic ring of the fiber optic gyroscope. According to actual needs, the design of the device needs to meet the following requirements: 1) The device not only serves as a test container to allow the fiber optic ring to work in various temperature environments set in the temperature test, but also needs to reflect the impact of the thermal design of the fiber optic gyroscope shell itself on the temperature performance; 2) The fiber optic ring to be tested should be easy to install and disassemble in the device, and should not be damaged during the installation and disassembly process; 3) The device needs to consider the smooth routing of the fiber optic ring pigtail to avoid the problem of pigtail breakage during the test. Summary of the invention

[0006] The object of the present invention is to provide a temperature testing system for a fiber optic gyroscope fiber ring that meets various requirements for the device in the temperature test of the fiber optic gyroscope fiber ring.

[0007] Another object of the present invention is to provide a method for using the temperature testing system for the fiber optic gyroscope fiber ring to implement the temperature testing of the fiber optic gyroscope fiber ring.

[0008] To this end, the technical solution of the present invention is as follows:

[0009] A temperature test system for an optical fiber ring of an optical fiber gyroscope, comprising an optical fiber ring test device arranged in a temperature box, and an optical path signal processing device, a circuit signal processing device and a data acquisition and processing device arranged outside the temperature box;

[0010] The optical fiber ring test device comprises a lower cover, an adhesive transition plate and an upper cover which are arranged in sequence from bottom to top, as well as a Y-waveguide optical integrator and a temperature sensor; an open cylinder is arranged at the top of the lower cover, a circular upper cover mounting groove is arranged at the center of the cylinder, and an annular optical fiber ring mounting groove is formed in the circumference; the adhesive transition plate is an annular plate which is built into the bottom of the optical fiber ring mounting groove; the upper cover is composed of a lower cylindrical body, an annular cylindrical body extending axially upward from the edge of the top surface of the lower cylindrical body, and an upper annular plate whose inner edge is fixed to the top of the annular cylindrical body, so that when the lower cylindrical body of the upper cover is inserted into the upper cover mounting groove of the lower cover, the upper annular plate cover is installed in the optical fiber ring mounting groove. The top opening forms a closed annular space in the optical fiber ring installation groove; the Y-waveguide optical integrator comprises a Y-waveguide optical integrator body embedded in the upper cover, on which are provided a first pigtail input terminal for connecting to the first pigtail of the optical fiber ring under test, a second pigtail input terminal connected to the second pigtail of the optical fiber ring under test, and an optical signal output terminal; the temperature sensor comprises a temperature sensor body embedded in the upper cover, on which are provided a power ground input terminal connected to a power ground input electric signal line, a power input terminal connected to a power input electric signal line, and a temperature signal output terminal connected to a temperature signal output electric signal line;

[0011] The optical path signal processing device is connected to the optical signal output terminal to input the optical signal provided by the light source to the Y-waveguide optical integrator, and receive the optical signal of two beams of light transmitted in opposite directions in the optical fiber ring under test fed back by the Y-waveguide optical integrator;

[0012] The circuit signal processing device is respectively connected to the power ground input electrical signal line, the power input electrical signal line and the temperature signal output electrical signal line to supply power to the temperature sensor and collect the temperature signal. At the same time, the circuit signal processing device is connected to the optical path signal processing device to collect the optical signal output by the optical path signal processing device and convert it into an electrical signal;

[0013] The data acquisition and processing device is connected to the circuit signal processing device to acquire, store and process the output optical signal and temperature signal to obtain the temperature characteristic index of the measured optical fiber ring.

[0014] Furthermore, the optical path signal processing device includes an optical fiber coupler, a light source and a detector; one end of the optical fiber coupler is connected to the optical signal output terminal in the optical fiber ring testing device through an optical signal transmission optical fiber, and the other end is connected to the light source and the detector respectively through the optical signal transmission optical fiber.

[0015] Furthermore, the circuit signal processing device includes a temperature sensor power supply module, a temperature sensor temperature signal acquisition module, an optical fiber ring signal processing module and a data transmission module; the negative pole and the positive pole of the temperature sensor power supply module are respectively connected to the power ground input electrical signal line and the other end of the power input electrical signal line to power the temperature sensor; the temperature sensor temperature signal acquisition module is connected to the temperature signal output electrical signal line of the temperature sensor to collect the temperature signal from the temperature sensor; the optical fiber ring signal processing module is connected to the detector through the optical signal output electrical signal line to collect the optical signal output by the optical fiber ring and convert it into an electrical signal; the data transmission module is respectively connected to the temperature sensor temperature signal acquisition module and the optical fiber ring signal processing module through the signal transmission line to output the optical signal and temperature signal converted into electrical signals to the outside.

[0016] Furthermore, the data acquisition and processing device includes a data acquisition module, a data storage module and a data processing module; the data acquisition module is connected to the data transmission module through a signal transmission line to receive the optical signal and temperature signal converted into electrical signals; the data storage module is connected to the data acquisition module through a signal transmission line to store the optical signal and temperature signal converted into electrical signals on a storage medium; the data processing module is connected to the data storage module through a signal transmission line to process the optical signal and temperature signal converted into electrical signals and obtain the temperature characteristic index of the optical fiber ring under test.

[0017] Furthermore, an outer annular convex strip and an inner annular convex strip are respectively provided at the outer edge and inner edge of the top surface of the upper annular plate of the upper cover, so that an annular pigtail groove is formed therebetween, and a pigtail outlet notch I connected to the optical fiber ring mounting groove is provided on the outer annular convex strip, and a pigtail outlet notch II is provided on the inner annular convex strip which is farthest from the pigtail outlet notch I, and a first narrow pigtail fixing groove and a second narrow pigtail fixing groove connected to the upper cover mounting groove are respectively provided on both sides of the pigtail outlet notch II.

[0018] Furthermore, two cylindrical bosses are symmetrically arranged at the bottom of the upper cover mounting groove of the upper cover, and a threaded blind hole is opened axially downward from the top surface of each cylindrical boss to screw in a screw as a handle of the upper cover.

[0019] Furthermore, the size of the annular optical fiber ring installation groove is slightly larger than the size of the optical fiber ring to be measured; the outer diameter of the adhesive transition plate is slightly larger than the size of the optical fiber ring to be measured, and the inner diameter is slightly smaller than the size of the optical fiber ring to be measured.

[0020] Furthermore, three cylindrical bosses are evenly distributed along the circumferential direction on the bottom surface of the lower cover, and a threaded blind hole is opened axially upward from the bottom surface of each cylindrical boss, so that the optical fiber ring test device can be fixed on the mounting plate of the temperature box and leave a wiring space between the lower cover and the mounting plate; an arc-shaped through hole is opened from the upper cover to penetrate the upper cover and the lower cover.

[0021] Furthermore, the upper cover, the adhesive transition plate and the lower cover are all made of the same material as the shell material of the fiber optic gyroscope in which the optical fiber ring to be tested is located.

[0022] A method for using the temperature testing system for the fiber optic gyroscope fiber ring to perform temperature testing, the steps are as follows:

[0023] S1. Assemble the fiber ring test device:

[0024] The lower plane of the optical fiber ring to be tested is glued to the upper plane of the adhesive transition plate by glue and built into the optical fiber ring installation groove; the lower plane of the adhesive transition plate is glued to the upper plane of the optical fiber ring installation groove opened in the lower cover by glue, so that the three are coaxially arranged and fixed as a whole; the upper cover is installed and fixed on the lower cover; the Y-waveguide optical integrator and the temperature sensor are fixed on the upper cover;

[0025] S2. Fusing the lines of the Y-waveguide optical integrator, including:

[0026] The first pigtail of the optical fiber ring to be tested is led out through the pigtail outlet notch I, and then runs along the left side of the annular pigtail groove opened in the upper cover until it passes through the pigtail outlet notch II and enters the first narrow pigtail groove entrance and is fixed in the first narrow pigtail groove, and the end of the first pigtail extends into the circular groove of the upper cover and is connected to the first pigtail input terminal of the Y-waveguide optical integrator;

[0027] The second pigtail of the optical fiber ring to be tested is led out through the pigtail outlet notch I, and then runs along the right side of the annular pigtail groove opened in the upper cover until it passes through the pigtail outlet notch II and enters the entrance of the second narrow pigtail groove and is fixed in the second narrow pigtail groove, and the end of the second pigtail extends into the circular groove of the upper cover and is connected to the second pigtail input terminal of the Y-waveguide optical integrator;

[0028] Lead out the second pigtail of the optical fiber ring to be tested through the pigtail outlet notch of the upper cover; then, lead out the second pigtail from the optical fiber ring installation groove opened in the lower cover and run along the right side of the annular pigtail groove opened in the upper cover to the second narrow pigtail groove entrance opened on the left side of the upper cover, fix the second pigtail through the second narrow pigtail groove, enter the circular groove of the upper cover and connect with the second pigtail input terminal of the Y-waveguide optical integrator;

[0029] One end of the optical signal transmission fiber is fused to the optical signal output terminal of the Y-waveguide optical integrator, and the other end of the optical signal transmission fiber is fused to the single pigtail end of the optical fiber coupler of the optical path signal processing device;

[0030] S3. Solder the circuit of the temperature sensor:

[0031] The power ground input electric signal line is welded to the power ground input terminal, the power input electric signal line is welded to the power input terminal, and the temperature signal output electric signal line is welded to the temperature signal output terminal; then the power ground input electric signal line, the power input electric signal line and the temperature signal output electric signal line are parallelly passed through the circular through hole opened on the circular groove of the upper cover and the arc-shaped through hole opened on the upper cover mounting groove of the lower cover to reach the space formed by the support of the three cylindrical bosses of the lower cover and connected to the external circuit signal processing device;

[0032] S4. Perform temperature test on the optical fiber ring under test;

[0033] The optical fiber ring test device is fixed in the temperature box by screwing the screws in reverse; the optical signal transmission optical fiber, the power ground input electrical signal line, the power input electrical signal line and the temperature signal output electrical signal line are passed through the wire holes provided on the temperature box, the optical signal transmission optical fiber is fused with the optical fiber coupler, the power ground input electrical signal line and the power input electrical signal line are respectively welded and connected to the negative electrode and the positive electrode of the temperature sensor power supply module, and the temperature signal output electrical signal line is welded and connected to the temperature signal acquisition module of the temperature sensor; then, the temperature of the temperature box is adjusted according to the temperature setting requirements of the temperature test, and during the test, the sensitive angular velocity signal fed back by the tested optical fiber ring and the temperature signal measured by the temperature sensor are synchronously collected, so as to obtain the temperature characteristics of the tested optical fiber ring through analysis after the temperature test;

[0034] S5. After the test is completed, disconnect the fiber optic ring test device from the optical path signal processing device and the circuit signal processing device; then, take the fiber optic ring test device out of the temperature chamber; then, disconnect the fusion joint between the two pigtails of the fiber optic ring in the fiber optic ring test device and the Y-waveguide optical integrated device; then, remove the upper cover of the device; then, immerse the fiber optic ring test device in a degumming solvent, and after the cured glue softens, disassemble the fiber optic ring under test.

[0035] Compared with the prior art, the temperature testing system for the fiber optic gyroscope fiber ring and the method for using the same have the following beneficial effects:

[0036] (1) The temperature test system for the fiber optic gyroscope fiber ring of the present application fills the gap in the fiber optic gyroscope fiber ring temperature test device in the art, and can well simulate the temperature environment of the fiber optic ring under test in the actual fiber optic gyroscope, and proposes a temperature test system that can meet the needs of various temperature environments, and at the same time can reflect the influence of the thermal design of the fiber optic gyroscope shell itself on the temperature performance of the fiber optic ring under test;

[0037] (2) In the temperature test system for the fiber optic gyroscope fiber ring of the present application, an adhesive transition plate is designed in the structure of the fiber optic ring test device to improve the convenience of installation and removal of the fiber optic ring under test. When removing the fiber optic ring under test in a narrow space, the tool touches the adhesive transition plate, avoiding direct contact between the tool and the fiber optic ring under test, thereby avoiding damage to the fiber optic ring under test during removal; at the same time, a fiber pigtail outlet notch, an annular fiber pigtail groove and a narrow fiber pigtail groove are designed on the upper cover for the fiber pigtail routing of the fiber optic ring, fully considering the smooth routing of the fiber pigtail of the fiber optic ring to avoid the breakage of the pigtail;

[0038] (3) The temperature test system for the fiber optic gyroscope fiber ring of the present application has a reasonable structural design, is simple and easy to use, and is not prone to damage the fiber optic ring. It has high practical value in the field of fiber optic gyroscope fiber ring temperature testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the split structure of the optical fiber ring testing device of the temperature testing system for the optical fiber ring of the optical fiber gyroscope of the present invention;

[0040] Figure 2 It is a schematic cross-sectional structure diagram of a fiber optic ring testing device of a temperature testing system for a fiber optic ring of a fiber optic gyroscope according to the present invention;

[0041] Figure 3 It is a schematic structural diagram of a Y-waveguide optical integrator in a fiber ring test device of a temperature test system for a fiber ring of a fiber optic gyroscope according to the present invention;

[0042] Figure 4 It is a schematic diagram of the routing of the first pigtail of the optical fiber ring to be tested in the optical fiber ring testing device of the temperature testing system for the optical fiber ring of the optical fiber gyroscope of the present invention;

[0043] Figure 5 It is a schematic diagram of the routing of the second pigtail of the optical fiber ring to be tested in the optical fiber ring testing device of the temperature testing system for the optical fiber ring of the optical fiber gyroscope of the present invention;

[0044] Figure 6 It is a structural schematic diagram of a temperature sensor in a fiber optic ring testing device of a temperature testing system for a fiber optic gyroscope fiber optic ring of the present invention;

[0045] Figure 7 It is a structural schematic diagram of a lower cover in a fiber optic ring testing device of a temperature testing system for a fiber optic gyroscope fiber ring of the present invention;

[0046] Figure 8 It is a structural schematic diagram of an upper cover in a fiber optic ring testing device of a temperature testing system for a fiber optic gyroscope fiber ring of the present invention;

[0047] Fig. 9 It is a flow chart of a method for using the optical fiber ring testing device of the temperature testing system for the optical fiber ring of the optical fiber gyroscope of the present invention;

[0048] Fig.10 A schematic diagram of the mechanical assembly process of the optical fiber ring testing device of the temperature testing system for the optical fiber ring of the optical fiber gyroscope of the present invention;

[0049] Fig.11 It is a structural schematic diagram of a temperature testing system for a fiber optic gyroscope optical fiber ring of the present invention.

[0050] Among them, 1. Y-waveguide optical integrator, 101. Y-waveguide optical integrator body, 102. first pigtail input terminal, 103. second pigtail input terminal, 104. optical signal output terminal, 2. temperature sensor, 201. temperature sensor body, 202. power ground input terminal, 203. power input terminal, 204. temperature signal output terminal, 3. upper cover, 4. optical fiber ring to be tested, 5. adhesive transition plate, 6. lower cover, 7. first pigtail, 8. second pigtail, 9. optical fiber ring test device, 10. temperature box, 11. optical signal transmission optical fiber, 12. optical path signal processing device, 12 01. Fiber optic coupler, 1202. Light source, 1203. Detector, 13. Power ground input electrical signal line of temperature sensor, 14. Power input electrical signal line of temperature sensor, 15. Temperature signal output electrical signal line of temperature sensor, 16. Circuit signal processing device, 1601. Temperature sensor power supply module, 1602. Temperature sensor temperature signal acquisition module, 1603. Fiber optic ring signal processing module, 1604. Data output module, 17. Data acquisition storage and processing module, 1701. Data acquisition module, 1702. Data storage module, 1703. Data processing module. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0052] like Fig.11 As shown, the temperature test system for the fiber optic gyroscope optical fiber ring includes an optical fiber ring test device 9 arranged in a temperature box 10, and an optical path signal processing device 12, a circuit signal processing device 16 and a data acquisition and processing device 17 arranged outside the temperature box 10.

[0053] like Figure 1As shown, the optical fiber ring testing device 9 includes a Y-waveguide optical integrator 1, a temperature sensor 2, an upper cover 3, an adhesive transition plate 5 and a lower cover 6; wherein the lower cover 6, the adhesive transition plate 5 and the upper cover 3 are arranged in sequence from bottom to top, and the Y-waveguide optical integrator 1 and the temperature sensor 2 are arranged on the upper cover 3.

[0054] like Figure 2 As shown, the lower cover 6 is a cylindrical structure with an opening at the top, and an annular partition is fixed inside the cylinder. The annular partition is coaxially arranged with the cylinder, so that a circular upper cover mounting groove is formed at the center of the cylinder, and an annular optical fiber ring mounting groove is formed in the circumference, and the size of the annular optical fiber ring mounting groove is slightly larger than the size of the optical fiber ring 4 to be tested;

[0055] Among them, three cylindrical bosses are evenly distributed along the circumferential direction on the bottom surface of the lower cover 6, and a threaded blind hole is opened on the bottom surface of each cylindrical boss, which is used to fix the fiber optic gyroscope fiber ring to the mounting plate in the temperature box by screwing the temperature test system in reverse to perform temperature testing; at the same time, the three cylindrical bosses provide routing space for each signal line between the bottom surface of the lower cover 6 and the mounting plate.

[0056] The adhesive transition plate 5 is a structure for improving the convenience of installation and removal of the optical fiber ring 4 to be tested. Specifically, it is a ring plate, which is built into the optical fiber ring installation groove; the outer diameter of the adhesive transition plate 5 is slightly larger than the size of the optical fiber ring 4 to be tested, and the inner diameter is slightly smaller than the size of the optical fiber ring 4 to be tested, so that when the optical fiber ring 4 to be tested is removed in a narrow space, the tool only touches the adhesive transition plate 5, and does not directly touch the optical fiber ring 4 to be tested, thereby avoiding damage to the optical fiber ring 4 to be tested during removal;

[0057] When in use, the lower plane of the measured optical fiber ring 4 is glued to the upper plane of the adhesive transition plate 5 by glue, and then the adhesive transition plate 5 and the measured optical fiber ring 4 that are glued together are inserted into the optical fiber ring mounting groove of the lower cover 6, and the lower plane of the adhesive transition plate 5 is glued to the bottom surface of the optical fiber ring mounting groove by glue, so that the adhesive transition plate 5, the measured optical fiber ring 4 and the lower cover are connected and fixed as a whole; in addition, the overall axial height of the adhesive transition plate 5 and the measured optical fiber ring 4 is slightly lower than the groove depth of the optical fiber ring mounting groove to prevent the upper cover 3 from touching the measured optical fiber ring 4.

[0058] The upper cover 3 is composed of a lower cylindrical body, an annular cylinder extending axially upward from the edge of the top surface of the lower cylindrical body, and an upper annular plate whose inner edge is fixed to the top end of the annular cylinder, so that when the lower cylindrical body of the upper cover 3 is inserted into the upper cover mounting groove of the lower cover 6, its upper annular plate cover is installed at the top end opening of the optical fiber ring mounting groove, so that the optical fiber ring mounting groove forms a closed annular space; wherein, the upper cover 3 and the lower cover 6 are detachably fixed as a whole by three countersunk screws evenly installed from the top surface of the lower cylindrical body, and at the same time, the optical fiber ring mounting groove forms a closed space; the closed space is used to simulate the thermal environment of the optical fiber ring 4 under test in the actual optical fiber gyroscope, so that the device can not only serve as a test container to allow the optical fiber ring 4 under test to work in various temperature environments set in the temperature test, but also reflect the effect of the thermal design of the optical fiber gyroscope shell itself on the temperature performance of the optical fiber ring 4 under test.

[0059] Preferably, in order to better simulate the temperature environment of the optical fiber ring in an actual optical fiber gyroscope, the upper cover 3 and the lower cover 6 are both made of the same material as the shell material of the actual optical fiber gyroscope, that is, the upper cover 3 and the lower cover 6 are both made of hard aluminum 2A12.

[0060] As a preferred technical solution of the present application, an outer annular convex strip and an inner annular convex strip are respectively provided at the outer edge and the inner edge of the top surface of the upper annular plate of the upper cover 3, so that an annular pigtail groove is formed therebetween, and a pigtail outlet notch I connected to the optical fiber ring mounting groove is provided on the outer annular convex strip, and a pigtail outlet notch II is provided on the inner annular convex strip which is farthest from the pigtail outlet notch I, and a first narrow pigtail fixing groove and a second narrow pigtail fixing groove connected to the upper cover mounting groove are respectively provided on both sides of the pigtail outlet notch II, which are used for routing and fixing the two pigtails of the measured optical fiber ring 4 when connected to the Y-waveguide optical integrator 1.

[0061] As a preferred technical solution of this application, Figure 8 As shown, two cylindrical bosses are symmetrically provided at the bottom of the upper cover mounting groove of the upper cover 3, and a threaded blind hole is opened axially downward from the top surface of each cylindrical boss, which can be used to screw in screws as a handle for the upper cover 3, so as to improve the convenience of installation and disassembly of the device and the convenience of pigtail routing.

[0062] The Y-waveguide optical integrator 1 is a multifunctional integrated optical device of model YBD-13-2-M produced by Wuhan Changyingtong Optoelectronics Technology Co., Ltd., which is embedded in the Y-waveguide optical integrator installation groove opened at the center of the top surface of the lower cylindrical body of the upper cover 3; Figure 3 As shown, the Y-waveguide optical integrator 1 includes a Y-waveguide optical integrator body 101, on which a first pigtail input terminal 102, a second pigtail input terminal 103 and an optical signal output terminal 104 are arranged; specifically,

[0063] Two screw holes are provided on the Y-waveguide optical integrator body 101, so that two flat head screws are threadedly connected with the threaded holes provided on the upper cover 3 through the screw holes of the Y-waveguide optical integrator 1, thereby fixing the Y-waveguide optical integrator 1 on the upper cover 3;

[0064] The first pigtail input terminal 102 is connected to the first pigtail 7 of the optical fiber ring 4 under test, and the second pigtail input terminal 103 is connected to the second pigtail 8 of the optical fiber ring 4 under test; when used, Figure 4 As shown, the first pigtail 8 of the optical fiber ring 5 to be tested is led out through the pigtail outlet notch I, and then runs along the left side of the annular pigtail groove opened in the upper cover 3, until it enters the first narrow pigtail groove entrance from the pigtail outlet notch II of the upper cover 3 and is fixed in the first narrow pigtail groove, and the end of the first pigtail 8 extends into the circular groove of the upper cover 3 and is connected to the first pigtail input terminal 102 of the Y-waveguide optical integrator 1; then, as shown Figure 5 As shown, the second pigtail 9 of the optical fiber ring 5 to be tested is led out through the pigtail outlet notch I, and then runs along the right side of the annular pigtail groove opened in the upper cover 3 until it enters the entrance of the second narrow pigtail groove from the pigtail outlet notch II of the upper cover 3 and is fixed in the second narrow pigtail groove, and the end of the second pigtail 9 extends into the circular groove of the upper cover 3 and is connected to the second pigtail input terminal 103 of the Y-waveguide optical integrator 1; the optical signal output terminal 104 is connected to an optical signal transmission optical fiber 11, which is used for light input from an external light source on the one hand, and for outputting interference light generated in the Y-waveguide by two beams of light in opposite directions in the optical fiber ring on the other hand.

[0065] The temperature sensor 2 is a DS18B20 temperature sensor, which is embedded in a temperature sensor installation groove on the top surface of the lower cylindrical body of the upper cover 3, and the lower plane of the temperature sensor 2 is glued to the bottom surface of the temperature sensor installation groove by glue to connect them as a whole;

[0066] like Figure 6 As shown, the temperature sensor 2 includes a temperature sensor body 201, on which a power ground input terminal 202, a power +5V input terminal 203 and a temperature signal output terminal 204 are provided; specifically, the power ground input terminal 202 is connected to a power ground input electrical signal line 13, the power +5V input terminal 203 is connected to a power +5V input electrical signal line 14, and the temperature signal output terminal 204 is connected to a temperature signal output electrical signal line 15; Figure 7 As shown, the three electrical signal lines respectively pass through the arc-shaped through holes opened from the top surface of the upper cover mounting groove of the upper cover 3 and penetrate to the bottom surface of the lower cover 6, and then are output to the external circuit signal processing device 16 through the wiring space.

[0067] The optical path signal processing device 12 includes an optical fiber coupler 1201, a light source 1202 and a detector 1203; specifically, one end of the optical fiber coupler 1201 is connected to the optical signal output terminal 104 in the optical fiber ring test device 9 through the optical signal transmission optical fiber 11, and the other end is connected to the light source 1202 and the detector 1203 respectively through the optical signal transmission optical fiber;

[0068] The specific process is as follows: the light source 1202 provides a light source for the optical fiber ring 4 to be tested in the optical fiber ring testing device 9; the optical fiber coupler 1201 is used for light transmission and splitting, and one end of the optical fiber coupler has a single pigtail, which is connected to the optical signal output terminal 104 of the Y-waveguide optical integrator 1 through the optical signal transmission optical fiber 11; the other end of the optical fiber coupler 1201 has a double pigtail, one of which is connected to the light source 1202 for transmitting the light provided by the light source 1202 to the optical fiber ring 4 to be tested via the Y-waveguide optical integrator 1, and the other pigtail is connected to one end of the detector 1203 for transmitting the interference light signal formed by the two beams of light transmitted in opposite directions from the optical fiber ring transmitted from the Y-waveguide optical integrator 1 to the detector 1203; the other end of the detector 1203 is connected to the circuit signal processing device 16, and the detector 1203 converts the interference light signal formed by the two beams of light transmitted in opposite directions in the optical fiber ring 4 to be tested fed back by the Y-waveguide optical integrator 1 into an electrical signal and transmits it to the circuit signal processing device 16.

[0069] The circuit signal processing device 16 includes a temperature sensor power supply module 1601, a temperature sensor temperature signal acquisition module 1602, an optical fiber ring signal processing module 1603 and a data transmission module 1604; specifically,

[0070] The negative electrode and the positive electrode of the temperature sensor power supply module 1601 are respectively welded to the other end of the power ground input electrical signal line 13 and the power +5V input electrical signal line 14 to supply power to the temperature sensor 2;

[0071] The temperature sensor temperature signal acquisition module 1602 is welded and connected to the temperature signal output electrical signal line 15 of the temperature sensor 2, and is used to acquire the temperature signal detected by the temperature sensor 2;

[0072] The optical fiber ring signal processing module 1603 is connected to the detector 1203 through an optical signal output electrical signal line, and is used to collect the interference optical signal formed by two beams of light transmitted in opposite directions in the measured optical fiber ring 4 fed back by the Y-waveguide optical integrator 1;

[0073] The data transmission module 1604 is connected to the temperature sensor temperature signal acquisition module 1602 and the optical fiber ring signal processing module 1603 through signal transmission lines, and is used to collect the temperature sensor temperature signal and the optical fiber ring signal to transmit them to the data acquisition and processing device 17 .

[0074] The data acquisition and processing device 17 includes a data acquisition module 1701, a data storage module 1702 and a data processing module 1703; specifically, the data acquisition module 1701 is connected to the data transmission module 1604 through a signal transmission line, and is used to receive the temperature signal of the temperature sensor and the optical fiber ring signal; the data storage module 1702 is used to store the data collected by the data acquisition module 1701 on a storage medium; the data processing module 1703 is used to analyze the temperature signal of the temperature sensor and the optical fiber ring signal to obtain the temperature characteristic index of the optical fiber ring 4 under test.

[0075] In this embodiment, the temperature signal of the temperature sensor is specifically the ambient temperature in the temperature box 10 measured in real time, and the fiber optic ring signal is specifically the angular velocity signal to which the fiber optic ring 4 under test is sensitive. By analyzing the data results of the two, the temperature characteristics of the fiber optic ring 4 under test can be obtained, and then the temperature index of the fiber optic ring can be effectively evaluated.

[0076] like Fig. 9 and Fig.10 As shown, the specific method of using the temperature test system for the fiber optic gyroscope fiber ring to implement temperature testing is as follows:

[0077] S1, completing the mechanical assembly of the optical fiber ring testing device 9;

[0078] The lower plane of the optical fiber ring 4 to be tested is glued to the upper plane of the adhesive transition plate 5 by glue; the adhesive transition plate 5 and the optical fiber ring 4 to be tested, which are glued as one, are placed in the optical fiber ring installation groove opened in the lower cover 6, and the lower plane of the adhesive transition plate 5 is glued to the upper plane of the optical fiber ring installation groove opened in the lower cover 6 by glue;

[0079] Place the upper cover 3 on the upper cover mounting groove opened in the lower cover 6 and use three countersunk screws to thread through the three countersunk holes of the upper cover 3 and the threaded holes of the lower cover 6 to fix the upper cover 3 on the lower cover 6;

[0080] Place the temperature sensor 2 in the temperature sensor installation groove opened in the upper cover 3 and glue the lower plane of the temperature sensor 2 to the upper plane of the temperature sensor installation groove opened in the upper cover 3;

[0081] Place the Y-waveguide optical integrator 1 on the Y-waveguide optical integrated device installation slot provided on the upper cover 3 and fix the Y-waveguide optical integrator 1 on the upper cover 3 by threading through the screw holes of the Y-waveguide optical integrator 1 and the threaded holes of the upper cover 3 with two flat head screws;

[0082] S2. Complete the fusion splicing of optical fibers in the device:

[0083] The first pigtail 7 of the optical fiber ring 4 to be tested is fused; specifically, as Figure 4As shown, the first pigtail 8 of the optical fiber ring 5 to be tested is led out through the pigtail outlet notch I, and then runs along the left side of the annular pigtail groove opened in the upper cover 3 until it passes through the pigtail outlet notch II and enters the first narrow pigtail groove entrance and is fixed in the first narrow pigtail groove, and the end of the first pigtail 8 extends into the circular groove of the upper cover 3 and is connected to the first pigtail input terminal 102 of the Y-waveguide optical integrator 1;

[0084] The second pigtail 8 of the optical fiber ring 4 under test is fused; specifically, as Figure 5 As shown, the second pigtail 9 of the optical fiber ring 5 to be tested is led out through the pigtail outlet notch I, and then runs along the right side of the annular pigtail groove opened in the upper cover 3 until it passes through the pigtail outlet notch II and enters the entrance of the second narrow pigtail groove and is fixed in the second narrow pigtail groove, and the end of the second pigtail 9 extends into the circular groove of the upper cover 3 and is connected to the second pigtail input terminal 103 of the Y-waveguide optical integrator 1;

[0085] The optical signal transmission fiber 11 is fused; specifically, the optical signal transmission fiber 11 is fused to the optical signal output terminal 104 of the Y-waveguide optical integrator 1, and finally the optical signal transmission fiber 11 is led to the external optical path signal processing device 12;

[0086] S3, completing the welding of the electrical signal wire of the temperature sensor in the device;

[0087] First, the power ground input electrical signal line 13 is welded to the power ground input terminal 202 of the temperature sensor 2, the power +5V input electrical signal line 14 is welded to the power +5V input terminal 203 of the temperature sensor 2, and the temperature signal output electrical signal line 15 is welded to the temperature signal output terminal 204 of the temperature sensor 2; then, the power ground input electrical signal line 13, the power +5V input electrical signal line 14 and the temperature signal output electrical signal line 15, a total of three electrical signal lines, which are led out from the power ground input terminal 202, the power +5V input terminal 203 and the temperature signal output terminal 204, pass through the circular through hole opened on the circular groove of the upper cover 3 and the arc-shaped through hole opened on the upper cover mounting groove of the lower cover 6 to reach the space formed by the three cylindrical bosses of the lower cover 6 and connect to the external circuit signal processing device 16.

[0088] S4, such as Fig.11 As shown, the device is placed in a test system for testing;

[0089] First, fix the assembled fiber optic ring test device 9 for the fiber optic gyroscope fiber ring in the temperature box 10 by reversely screwing the screws; fuse the optical signal transmission fiber 11 of the fiber optic ring test device 9 with the fiber optic coupler 1201 of the optical path signal processing device 12; then, weld the power ground input electrical signal line 13 and the power +5V input electrical signal line 14 of the temperature sensor 2 of the fiber optic ring test device 9 with the temperature sensor power supply module 1601 of the circuit signal processing device 16, and weld the temperature signal output electrical signal line 15 of the temperature sensor 2 of the fiber optic ring test device 9 with the temperature sensor temperature signal acquisition module 1602; then, according to the temperature setting of the temperature test, The temperature box 10 is controlled to perform a temperature test. During the test, the data acquisition module 1701 of the data acquisition storage and processing device 17 is used to collect the angular velocity signal of the optical fiber ring 4 under test and the temperature signal measured by the temperature sensor 2 output by the data output module 1604 of the circuit signal processing device 16. The collected data are stored in the data storage module 1702 of the data acquisition storage and processing device 17. Finally, after the temperature test, the data processing module 1703 of the data acquisition storage and processing device 17 is used to perform data analysis and processing on the angular velocity signal of the optical fiber ring 4 under test and the temperature signal measured by the temperature sensor 2 to obtain the temperature characteristics of the optical fiber ring 4 under test.

[0090] S5. After the test is completed, the optical signal transmission fiber 11 of the fiber optic ring test device 9 is disconnected from the optical path signal processing device 12, and the three electrical signal lines of the temperature sensor 2 are disconnected from the circuit signal processing device 16; then, the fiber optic ring test device 9 is taken out from the temperature box 10; thereafter, the fusion joint between the two pigtails of the fiber optic ring in the fiber optic ring test device 9 and the Y-waveguide optical integrated device 1 is disconnected; then, the upper cover 3 of the device 9 is removed; then, the fiber optic ring test device 9 with only the glued fiber optic ring 4 to be tested, the adhesive transition plate 5 and the lower cover 6 left is immersed in a degumming solvent, and after the cured glue is softened, the fiber optic ring 4 to be tested is disassembled.

Claims

1. A method for using a temperature test system for a fiber optic gyroscope fiber ring, characterized in that: A temperature test system for an optical fiber ring of an optical fiber gyroscope comprises an optical fiber ring test device (9) arranged in a temperature box (10), and an optical path signal processing device (12), a circuit signal processing device (16), and a data acquisition and processing device (17) arranged outside the temperature box (10); The optical fiber ring test device (9) comprises a lower cover (6), an adhesive transition plate (5) and an upper cover (3) which are arranged in order from bottom to top, as well as a Y-waveguide optical integrator (1) and a temperature sensor (2); the lower cover (6) is provided with an open cylinder at the top end, a circular upper cover mounting groove is provided at the center thereof, and an annular optical fiber ring mounting groove is formed in the circumference; the adhesive transition plate (5) is an annular plate which is built into the bottom of the optical fiber ring mounting groove; the upper cover (3) is composed of a lower cylindrical body, an annular cylindrical body extending upward along the axial direction from the edge of the top surface of the lower cylindrical body, and an upper annular plate whose inner edge is fixed to the top end of the annular cylindrical body, so that when the lower cylindrical body of the upper cover (3) is inserted into the upper cover mounting groove of the lower cover (6), the upper annular plate covers the top opening of the optical fiber ring mounting groove, so that the optical fiber ring mounting groove forms a closed annular space. The Y-waveguide optical integrator (1) comprises a Y-waveguide optical integrator body (101) embedded in the upper cover (3), on which are provided a first pigtail input terminal (102) for connecting to a first pigtail (7) of a tested optical fiber ring (4), a second pigtail input terminal (103) connected to a second pigtail (8) of the tested optical fiber ring (4), and an optical signal output terminal (104); the temperature sensor (2) comprises a temperature sensor body (201) embedded in the upper cover (3), on which are provided a power ground input terminal (202) connected to a power ground input electrical signal line (13), a power input terminal (203) connected to a power +5V input electrical signal line (14), and a temperature signal output terminal (204) connected to a temperature signal output electrical signal line (15); The optical path signal processing device (12) is connected to the optical signal output terminal (104) to input a light source signal provided by the light source (1202) to the Y-waveguide optical integrator (1), and receive optical signals of two beams of light transmitted in opposite directions in the optical fiber ring (4) under test and fed back by the Y-waveguide optical integrator (1); The circuit signal processing device (16) is respectively connected to the power ground input electrical signal line (13), the power input electrical signal line (14) and the temperature signal output electrical signal line (15) to supply power to the temperature sensor (2) and collect the temperature signal. At the same time, the circuit signal processing device (16) is connected to the optical path signal processing device (12) to collect the optical signal output by the optical path signal processing device (12) and convert it into an electrical signal. The data acquisition and processing device (17) is connected to the circuit signal processing device (16) to acquire, store and process the output optical signal and temperature signal to obtain the temperature characteristic index of the optical fiber ring (4) under test; The optical path signal processing device (12) comprises an optical fiber coupler (1201), a light source (1202) and a detector (1203); one end of the optical fiber coupler (1201) is connected to an optical signal output terminal (104) in an optical fiber ring testing device (9) via an optical signal transmission optical fiber (11), and the other end is connected to the light source (1202) and the detector (1203) respectively via optical signal transmission optical fibers; The circuit signal processing device (16) comprises a temperature sensor power supply module (1601), a temperature sensor temperature signal acquisition module (1602), an optical fiber ring signal processing module (1603) and a data transmission module (1604); the negative electrode and the positive electrode of the temperature sensor power supply module (1601) are respectively connected to the other end of the power ground input electrical signal line (13) and the power input electrical signal line (14) to supply power to the temperature sensor (2); the temperature sensor temperature signal acquisition module (1602) is connected to the temperature signal output electrical signal line (15) of the temperature sensor (2) to acquire the temperature signal from the temperature sensor (2); the optical fiber ring signal processing module (1603) is connected to the detector (1203) via the optical signal output electrical signal line to acquire the optical signal output by the optical fiber ring and convert it into an electrical signal; the data transmission module (1604) is respectively connected to the temperature sensor temperature signal acquisition module (1602) and the optical fiber ring signal processing module (1603) via the signal transmission line to output the optical signal and the temperature signal converted into an electrical signal to the outside; The data acquisition and processing device (17) comprises a data acquisition module (1701), a data storage module (1702) and a data processing module (1703); the data acquisition module (1701) is connected to the data transmission module (1604) via a signal transmission line to receive optical signals and temperature signals converted into electrical signals; the data storage module (1702) is connected to the data acquisition module (1701) via a signal transmission line to store the optical signals and temperature signals converted into electrical signals on a storage medium; the data processing module (1703) is connected to the data storage module (1702) via a signal transmission line to process the optical signals and temperature signals converted into electrical signals and obtain temperature characteristic indicators of the optical fiber ring (4) under test; An outer annular convex strip and an inner annular convex strip are respectively provided at the outer edge and the inner edge of the top surface of the upper annular plate of the upper cover (3), so that an annular pigtail groove is formed between the two, and a pigtail outlet notch I connected to the optical fiber ring mounting groove is provided on the outer annular convex strip, and a pigtail outlet notch II is provided on the inner annular convex strip which is farthest from the pigtail outlet notch I, and a first narrow pigtail fixing groove and a second narrow pigtail fixing groove connected to the upper cover mounting groove are respectively provided on both sides of the pigtail outlet notch II; The steps for using the temperature test are as follows: S1. Assembling the optical fiber ring test device (9): gluing the lower plane of the optical fiber ring (4) to be tested to the upper plane of the adhesive transition plate (5) by glue and inserting it into the optical fiber ring installation groove; gluing the lower plane of the adhesive transition plate (5) to the upper plane of the optical fiber ring installation groove opened in the lower cover (6) by glue, so that the three are coaxially arranged and fixed as a whole; installing and fixing the upper cover (3) on the lower cover (6); fixing the Y-waveguide optical integrator (1) and the temperature sensor (2) on the upper cover (3); S2, welding the lines of the Y-waveguide optical integrator, including: leading out the first pigtail (8) of the optical fiber ring (5) to be tested through the pigtail outlet notch I, and then running the fiber along the left side of the annular pigtail groove opened in the upper cover (3) until it passes through the pigtail outlet notch II and enters the first narrow pigtail groove entrance and is fixed in the first narrow pigtail groove, and the end of the first pigtail (8) extends into the circular groove of the upper cover (3) and is connected to the first pigtail input terminal (102) of the Y-waveguide optical integrator (1); The second pigtail (9) of the optical fiber ring (5) to be tested is led out through the pigtail outlet notch I, and then runs along the right side of the annular pigtail groove opened in the upper cover (3) until it passes through the pigtail outlet notch II and enters the entrance of the second narrow pigtail groove and is fixed in the second narrow pigtail groove, and the end of the second pigtail (9) extends into the circular groove of the upper cover (3) and is connected to the second pigtail input terminal (103) of the Y-waveguide optical integrator (1); One end of the optical signal transmission optical fiber (11) is fused to the optical signal output terminal (104) of the Y-waveguide optical integrator (1), and the other end of the optical signal transmission optical fiber (11) is fused to the single pigtail end of the optical fiber coupler (1201) of the optical path signal processing device (12); S3, welding the circuits of the temperature sensor: welding the power ground input electric signal line (13) to the power ground input terminal (202), welding the power input electric signal line (14) to the power input terminal (203), and welding the temperature signal output electric signal line (15) to the temperature signal output terminal (204); then passing the power ground input electric signal line (13), the power input electric signal line (14), and the temperature signal output electric signal line (15) in parallel through the circular through hole opened on the circular groove of the upper cover (3) and the arc-shaped through hole opened on the upper cover mounting groove of the lower cover (6) to reach the space formed by the support of the three cylindrical bosses of the lower cover (6) and connect to the external circuit signal processing device (16); S4, performing a temperature test on the optical fiber ring under test; fixing the optical fiber ring test device (9) in the temperature box (10) by screwing the screws in reverse; passing the optical signal transmission optical fiber (11), the power ground input electrical signal line (13), the power input electrical signal line (14) and the temperature signal output electrical signal line (15) through the wire holes provided on the temperature box (10), welding the optical signal transmission optical fiber (11) to the optical fiber coupler (1201), welding the power ground input electrical signal line (13) and the power input electrical signal line (14) to the negative electrode and the positive electrode of the temperature sensor power supply module (1601) respectively, and welding the temperature signal output electrical signal line (15) to the temperature sensor temperature signal acquisition module (1602); then, adjusting the temperature of the temperature box (10) according to the temperature setting requirements of the temperature test, and synchronously collecting the sensitive angular velocity signal fed back by the optical fiber ring under test (4) and the temperature signal measured by the temperature sensor (2) during the test, so as to obtain the temperature characteristics of the optical fiber ring under test (4) through analysis after the temperature test; S5. After the test is completed, the optical fiber ring test device (9) is disconnected from the optical path signal processing device (12) and the circuit signal processing device (16); then, the optical fiber ring test device (9) is taken out of the temperature box (10); thereafter, the fusion joint between the two pigtails of the optical fiber ring in the optical fiber ring test device (9) and the Y-waveguide optical integrated device (1) is disconnected; then, the upper cover (3) of the device (9) is removed; then, the optical fiber ring test device (9) with only the optical fiber ring (4), the adhesive transition plate (5) and the lower cover (6) being glued is immersed in a glue removal solvent, and after the cured glue is softened, the optical fiber ring to be tested is disassembled.

2. The method for using the temperature test based on the temperature test system for the fiber optic gyroscope fiber ring according to claim 1, characterized in that: Two cylindrical bosses are symmetrically arranged at the bottom of the upper cover mounting groove of the upper cover (3), and a threaded blind hole is opened axially downward from the top surface of each cylindrical boss to screw in a screw as a handle of the upper cover (3).

3. The method for using the temperature test based on the temperature test system for the fiber optic gyroscope fiber ring according to claim 1, characterized in that: The size of the annular optical fiber ring installation groove is slightly larger than the size of the optical fiber ring (4) to be measured; the outer diameter of the adhesive transition plate (5) is slightly larger than the size of the optical fiber ring (4) to be measured, and the inner diameter is slightly smaller than the size of the optical fiber ring (4) to be measured.

4. The method for using the temperature test based on the temperature test system for the fiber optic gyroscope fiber ring according to claim 1, characterized in that: Three cylindrical bosses are evenly distributed along the circumferential direction on the bottom surface of the lower cover (6), and a threaded blind hole is opened axially upward from the bottom surface of each cylindrical boss, so that the optical fiber ring test device (9) can be fixed on the mounting plate of the temperature box and a wiring space is left between the lower cover (6) and the mounting plate; an arc-shaped through hole is opened from the upper cover (3) and penetrates the upper cover (3) and the lower cover (6).

5. The method for using the temperature test based on the temperature test system for the fiber optic gyroscope fiber ring according to claim 1, characterized in that: The upper cover (3), the adhesive transition plate (5) and the lower cover (6) are all made of the same material as the shell material of the optical fiber gyroscope in which the optical fiber ring (4) to be measured is located.

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