Optical fiber gyroscope of limited space optical path design

Abstract

The utility model discloses an optical fiber gyroscope with limited space optical path design, which belongs to the technical field of optical fiber sensing and comprises a mounting cavity, a light source component is arranged in the mounting cavity and is in optical fiber connection with a first phase detection component, a second phase detection component and a third phase detection component. The first optical fiber ring, the second optical fiber ring and the third optical fiber ring of the three phase detection assemblies are fixed through orthogonally arranged fixing plates, and the bending radius of the three optical fiber rings is not larger than 30 mm. According to the optical fiber gyroscope with the preferential spatial light path design, the structural sizes of the optical fiber rings are reduced, the fixing assemblies are correspondingly arranged to limit and fix the optical fiber rings respectively, and the fixing assemblies fix the optical fiber rings in a three-dimensional space, so that on one hand, stable measurement of angular velocities of the optical fiber rings in all directions can be maintained; on the other hand, all the optical fiber rings can be restrained, stable arrangement of the optical fiber rings in a narrow space is achieved, and miniaturization of the optical fiber gyroscope is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber gyroscope with a limited space optical path design. Background Art

[0002] A gyroscope is a device that uses the momentum of a high-speed rotating body to detect the angular velocity of a sensitive shell relative to the inertial space around one or two axes orthogonal to the axis of rotation. Traditional gyroscopes are mainly mechanical gyroscopes, which have high requirements for process structure and complex structure, and their accuracy is restricted in many aspects.

[0003] Modern gyroscopes are mainly fiber optic gyroscopes, which are fiber optic sensors that are sensitive to angular velocity based on the Sagnac effect. The basic principle is to use the Sagnac effect in a closed optical path to measure the angular velocity of a rotating body. As the miniaturization requirements for fiber optic gyroscopes become higher and higher, higher requirements are placed on the signal quality of the optical path in a limited space. Existing fiber optic gyroscopes cannot solve the problems of fiber optic gyroscope arrangement in existing spaces and fiber optic gyroscope signal crosstalk. Utility Model Content

[0004] In view of one or more of the above defects or improvement needs of the prior art, the utility model provides a fiber optic gyroscope with a limited space optical path design to solve the problem that the existing fiber optic gyroscope is difficult to arrange in a small space.

[0005] To achieve the above object, the utility model provides a fiber optic gyroscope with a limited space optical path design, which includes:

[0006] An installation cavity, a light source assembly arranged in the installation cavity, a first phase detection assembly, a second phase detection assembly and a third phase detection assembly connected to the light source assembly by optical fiber, the first phase detection assembly comprising a first optical fiber ring, the second phase detection assembly comprising a second optical fiber ring, the third phase detection assembly comprising a third optical fiber ring, and the bending radii of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are not greater than 30 mm;

[0007] A fixing assembly is also provided in the installation cavity, and the fixing assembly includes a plurality of fixing plates arranged orthogonally, and the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are respectively fixed to one of the fixing plates of the fixing assembly, so that the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are arranged orthogonally in pairs.

[0008] As a further improvement of the present invention, the first phase detection component, the second phase detection component and the third phase detection component have the same structure, and the first phase detection component includes: a first optical fiber coupler, the first optical fiber coupler is respectively connected to a first detector and a first phase modulator, and the first phase modulator extends at two ends respectively connected to two ends of the first optical fiber ring.

[0009] As a further improvement of the present invention, the first fiber coupler is connected to the first detector and the first phase modulator through an optical fiber, the optical fiber connecting the first detector and the first phase modulator to the fiber coupler is connected by fusion splicing, and the optical fiber is in a straight state at the fusion point.

[0010] As a further improvement of the present invention, a fixed sleeve is provided at the fusion point of the optical fiber, the fixed sleeve wraps the fusion point, and a clamping component is provided inside the sleeve, and the clamping component fixes and clamps the optical fibers at both ends of the fusion point.

[0011] As a further improvement of the present invention, the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are fixed on the fixing plates by glue.

[0012] As a further improvement of the present utility model, the minimum bending radius of the optical fibers selected for the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is 10 mm.

[0013] As a further improvement of the present utility model, the bending radius of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is not greater than 10 mm, the bending radius of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is not greater than 10 mm, and the minimum bending radius of the optical fiber of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is 7.5 mm.

[0014] As a further improvement of the present invention, the bending radius of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is no more than 5 mm, and the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are bend-insensitive optical fibers with a minimum bending radius of 5 mm.

[0015] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In general, compared with the prior art, the above technical solutions conceived by the utility model have the following beneficial effects:

[0017] (1) The fiber optic gyroscope with limited space optical path design of the utility model reduces the structural dimensions of the fiber optic rings within the limited space of the installation cavity, and correspondingly sets fixed components to limit and fix each fiber optic ring. The fixed components fix the fiber optic rings in three-dimensional space. On the one hand, it can maintain the stable measurement of angular velocity in various directions by each fiber optic ring, and on the other hand, it can constrain each fiber optic ring to achieve stable arrangement of the fiber optic rings in a small space, thereby realizing the miniaturization of the fiber optic gyroscope.

[0018] (2) The fiber optic gyroscope with a limited space optical path design of the utility model limits the optical fiber connection end between the first optical fiber coupler and the first detector and the first phase modulator, and uses a fixed sleeve to clamp the connected optical fiber ends, thereby ensuring the stable transmission of the optical signal at the optical fiber fusion point and ensuring the stable test of the angular velocity in all directions of the fiber optic gyroscope; secondly, due to the limitations of the narrow environment in this application, the optical fiber has more bends when it is routed and connected. The design of the fixed sleeve can also avoid problems such as fiber breakage caused by concentrated bending stress at the optical fiber fusion end, thereby ensuring the stable use of the fiber optic gyroscope.

[0019] (3) The fiber optic gyroscope with limited space optical path design of the utility model sets the bending radius of each fiber optic ring and selects the corresponding optical fiber of the set model size, so as to arrange the fiber optic ring in a limited space while ensuring that the optical fiber meets the minimum bending radius, thereby realizing the miniaturization of the fiber optic gyroscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the fiber optic gyroscope with limited space optical path design in the embodiment of the utility model.

[0021] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0022] 1. Install the cavity; 2. Light source assembly; 3. First optical fiber ring; 4. Second optical fiber ring; 5. Third optical fiber ring; 6. First optical fiber coupler; 7. First detector; 8. First phase modulator; 9. Fixed sleeve. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Example:

[0029] See also Figure 1The fiber optic gyroscope with limited space optical path design in the preferred embodiment of the utility model includes a mounting cavity 1, a light source assembly 2 arranged in the mounting cavity 1, and a first phase detection assembly, a second phase detection assembly, and a third phase detection assembly connected to the light source assembly 2 by optical fiber. Specifically, the first phase detection assembly, the second phase detection assembly, and the third phase detection assembly respectively include a first optical fiber ring 3, a second optical fiber ring 4, and a third optical fiber ring 5, and the bending radius of the first optical fiber ring 3, the second optical fiber ring 4, and the third optical fiber ring 5 is not greater than 30 mm; correspondingly, a fixing assembly is also provided in the mounting cavity 1 in the present application, and the fixing assembly includes a plurality of fixing plates arranged orthogonally, and the first optical fiber ring 3, the second optical fiber ring 4, and the third optical fiber ring 5 are respectively fixed on one of the fixing plates of the fixing assembly, so that the first optical fiber ring 3, the second optical fiber ring 4, and the third optical fiber ring 5 are arranged orthogonally in pairs.

[0030] Specifically, the fiber optic gyroscope with limited space optical path design in the present application reduces the size of the fiber optic ring structure in the limited installation cavity 1 space, and sets corresponding fixing components to limit and fix each fiber optic ring. The fixing components fix the fiber optic ring in three-dimensional space. On the one hand, it can maintain the stable measurement of the angular velocity of each fiber optic ring in each direction, and on the other hand, it can constrain each fiber optic ring to achieve the stable arrangement of the fiber optic ring in a small space, so as to achieve the miniaturization of the fiber optic gyroscope. It is worth noting that the present application limits the bending radius of the first fiber optic ring 3, the second fiber optic ring 4 and the third fiber optic ring 5, so that the optical fiber itself has a stronger unwinding ability. The conventional fiber optic gyroscope only needs to tie the fiber optic ring, while the present application needs to use a fixing plate to fix the fiber optic ring to ensure the stable setting of the fiber optic ring, and can avoid the fluctuation of the fiber optic ring caused by the fiber optic gyroscope equipped with the limited space design during the movement, thereby improving the measurement accuracy of the fiber optic gyroscope.

[0031] Further, as a preferred embodiment of the utility model, the first phase detection component, the second phase detection component and the third phase detection component in the present application have the same structure, and the first phase detection component specifically includes a first optical fiber coupler 6, the first optical fiber coupler 6 is respectively connected to a first detector 7 and a first phase modulator 8, and the first phase modulator 8 extends at both ends and is respectively connected to the two ends of the first optical fiber ring 3. The first phase detection component, the second phase detection component and the third phase detection component have the same structure, and the three are respectively arranged on the X-axis, the Y-axis and the Z-axis to measure the angular velocity of the moving object in three-dimensional space. Specifically, the first phase modulator 8 splits the emitted light into two, and the two beams of light are respectively transmitted along the forward direction and the reverse direction of the first optical fiber ring 3. The light is transmitted in clockwise and counterclockwise directions in a closed optical loop, and because the first optical fiber ring 3 rotates around the axis of its plane under the influence of the external motion environment, the phase difference of the light changes. The two beams of light are transmitted to the first optical fiber coupler 6 through the first phase modulator 8, and finally reflected at the first optical fiber coupler 6 and transmitted to the first detector 7. The phase difference of the two beams of light is obtained by the first detector 7, and the angular velocity of the external moving object in three-dimensional space is obtained by corresponding solution.

[0032] Preferably, the first phase modulator 8 in the present application is a Y-waveguide.

[0033] Further, as a preferred embodiment of the utility model, the first fiber coupler 6 in the present application is connected to the first detector 7 and the first phase modulator 8 through optical fibers, and the optical fibers connected to the first detector 7 and the first phase modulator 8 and the fiber coupler are connected by fusion splicing, and the optical fiber at the fusion splicing point is in a straight state. The first fiber coupler 6, the first detector 7, and the first phase modulator 8 in the present application are connected by optical fibers, and the optical fibers between the devices are connected by fusion splicing. Correspondingly, since the fiber optic gyroscope is designed in a limited space, the connection position and angle between the devices are limited, and the optical fibers between the devices are easy to bend in a limited space. In order to avoid stress concentration at the fusion splicing point of the optical fibers at both ends, resulting in fiber breakage, the present application specifically limits the optical fiber at the fiber fusion splicing point to a straight state. Optionally, at least 10 to 100 mm of the optical fibers at both ends of the fusion splicing point are in a straight state. Specifically, the straight state refers to the optical fiber extending along its axial direction without bending.

[0034] Further preferably, in the present application, a fixed sleeve 9 is provided at the fusion point of the optical fiber, and the fixed sleeve 9 wraps the fusion point, and a clamping assembly is provided in the sleeve, and the clamping assembly fixes and clamps the optical fibers at both ends of the fusion point. As one optional embodiment, the present application limits the position of the optical fiber at the fusion point by means of the fixed sleeve 9, and a clamping assembly is provided in the fixed sleeve 9 to fix the optical fiber to ensure that the optical fiber is in a straight state. Optionally, the clamping assembly can be a notch structure similar to that in the fusion box, and the position fixing is achieved by inserting the optical fibers at both ends into the notch; it can also be a clamping structure similar to a clamping plate, and the clamping plate is used to clamp and fix the optical fibers at both ends when they are fusion-connected.

[0035] Further preferably, in the present application, the first optical fiber ring 3, the second optical fiber ring 4, and the third optical fiber ring 5 are fixed to the respective fixing plates by glue. As mentioned above, in order to avoid problems such as shaking of the optical fiber rings during use, the present application corresponds to fixing the first optical fiber ring 3, the second optical fiber ring 4, and the third optical fiber ring 5 to the fixing plate by glue to ensure that the optical fiber rings are not affected by the external environment and are not subject to problems such as shaking or shaking.

[0036] Further preferably, the minimum bending radius of the optical fiber of the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 in the present application is 10 mm. When the bending radius of the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 in the present application is not greater than 30 mm, in order to avoid the destruction of the total reflection of light due to excessive bending angle of the optical fiber, the present application corresponds to the selection of optical fiber with a minimum bending radius of 10 mm to ensure stable transmission of light in each optical fiber ring. Preferably, the optical fiber in the present application is G.657.A1 optical fiber.

[0037] Further preferably, the bending radius of the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 in the present application is not greater than 10 mm, and the minimum bending radius of the optical fiber of the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 is 7.5 mm. The size of the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 in the present application can be further reduced, and correspondingly, the minimum bending radius of the optical fiber should also be changed accordingly. Preferably, when the bending radius of the optical fiber ring is not greater than 10 mm, the optical fiber selected is G.657.A2.

[0038] Further preferably, in the present application, the bending radius of the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 is not greater than 5 mm, and the first optical fiber ring 3, the second optical fiber ring 4 and the third optical fiber ring 5 use bend-insensitive optical fibers with a minimum bending radius of 5 mm. Correspondingly, when the bending radius of the optical fiber ring is further reduced to 5 mm, G.657.B3 optical fiber needs to be used.

[0039] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fiber optic gyroscope with a limited space optical path design, characterized in that: include: An installation cavity, a light source assembly arranged in the installation cavity, a first phase detection assembly, a second phase detection assembly and a third phase detection assembly connected to the light source assembly by optical fiber, the first phase detection assembly comprising a first optical fiber ring, the second phase detection assembly comprising a second optical fiber ring, and the third phase detection assembly comprising a third optical fiber ring; the bending radii of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are not greater than 30 mm; A fixing assembly is also provided in the installation cavity, and the fixing assembly includes a plurality of fixing plates arranged orthogonally, and the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are respectively fixed to one of the fixing plates of the fixing assembly, so that the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are arranged orthogonally in pairs.

2. The fiber optic gyroscope with limited space optical path design according to claim 1, characterized in that: The first phase detection component, the second phase detection component and the third phase detection component have the same structure. The first phase detection component includes: a first optical fiber coupler, the first optical fiber coupler is respectively connected to a first detector and a first phase modulator, and the first phase modulator extends at two ends respectively connected to two ends of the first optical fiber ring.

3. The fiber optic gyroscope with limited space optical path design according to claim 2, characterized in that: The first fiber coupler is connected to the first detector and the first phase modulator via an optical fiber. The optical fiber connecting the first detector and the first phase modulator to the fiber coupler is connected by fusion splicing, and the optical fiber is in a straight state at the fusion point.

4. The fiber optic gyroscope with limited space optical path design according to claim 3, characterized in that: The first phase modulator is connected to both ends of the first optical fiber ring through optical fibers, and the optical fiber connecting the phase modulator and the first optical fiber ring beam end is connected through fusion splicing, and the optical fiber is in a straight state at the fusion splicing point.

5. The fiber optic gyroscope with limited space optical path design according to claim 4, characterized in that: A fixed sleeve is sleeved at the fusion point of the optical fiber, the fixed sleeve wraps the fusion point, and a clamping component is arranged inside the sleeve, and the clamping component fixes and clamps the optical fibers at both ends of the fusion point.

6. The fiber optic gyroscope with limited space optical path design according to claim 1, characterized in that: The first optical fiber ring, the second optical fiber ring and the third optical fiber ring are fixed on the fixing plates by glue.

7. The fiber optic gyroscope with limited space optical path design according to claim 1, characterized in that: The minimum bending radius of the optical fibers of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is 10 mm.

8. The fiber optic gyroscope with limited space optical path design according to claim 1, characterized in that: The bending radius of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is not greater than 10 mm, and the minimum bending radius of the optical fibers of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is 7.5 mm.

9. The fiber optic gyroscope with limited space optical path design according to claim 1, characterized in that: The bending radius of the first optical fiber ring, the second optical fiber ring and the third optical fiber ring is not greater than 5 mm, and the first optical fiber ring, the second optical fiber ring and the third optical fiber ring use bend-insensitive optical fibers with a minimum bending radius of 5 mm.

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