Regular triangular pyramid type three-component rotary seismograph

Abstract

The invention discloses a regular triangular pyramid type three-component rotating seismograph, which is characterized by comprising a regular triangular pyramid structure formed by three side plates, a top plate and a bottom plate, three fiber-optic gyroscope modules, three light source modules and three circuit resolving modules, each side face of the regular triangular pyramid structure is provided with one fiber-optic gyroscope module, and sensitive axes of the fiber-optic gyroscope modules are perpendicular to the installation faces where the fiber-optic gyroscope modules are located. According to the invention, the performance loss caused by shaking is effectively reduced, the measurement stability of each component is ensured, the consistency between measurement data is remarkably improved, and the performance of the whole instrument is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber gyroscopes and relates to a regular triangular pyramid type three-component rotating seismograph. Background Art

[0002] Seismic waves are elastic waves radiated from earthquake sources inside the earth through the earth's crust. The study of seismic waves helps us understand the true situation inside the earth. Modern theory proves the existence of rotational components in seismic waves and points out that it plays a vital role in completely constructing earthquake models and understanding the generation, propagation and even prediction of earthquakes.

[0003] Traditional seismographs can only measure linear motion, so the study of seismic waves has been limited to the translational component for a long time in the history of seismic waves, and rotational seismology has therefore developed slowly. However, the rapid development of fiber optic gyroscopes has greatly promoted their application in various fields, and three-component fiber optic gyroscopes have emerged as a new type of rotational angular velocity measurement equipment, which has important applications in missiles, aviation, aerospace, navigation, geological surveying, and high-rise monitoring.

[0004] Inventor Cao Yuwen and others improved the traditional seismograph and proposed a three-component rotation seismograph, which can perform rotation tests on ground earthquake sources and directly measure the three components of rotational motion during earthquakes, see patent document with publication number CN112083477A, ​​titled "A three-component rotation seismograph". In order to facilitate disassembly and assembly, inventor Huang He and others proposed a patent with publication number CN216285753U, titled "Fiber Optic Rotation Seismograph".

[0005] The existing rotational seismograph solutions have the following characteristics: 1. The three-component fiber-optic rotational seismographs all use a dual-polarization optical path, and 2. The given assembly method is an orthogonal assembly of the three components.

[0006] The traditional seismograph solution has the following disadvantages:

[0007] 1. For the existing dual polarization optical path:

[0008] Existing three-component fiber optic rotational seismometers all use dual-polarization optical paths, which can improve sensitivity to a certain extent, but will cause a decrease in stability.

[0009] 2. For the existing three-component structure:

[0010] The so-called "orthogonal assembly" in the existing scheme is: the sensitive axis of one component is perpendicular to the ground and faces upward, and the other two components are orthogonal to this component and installed vertically. Figure 1 shown.

[0011] However, in reality, of the three-component fiber-optic rotation seismograph assembled in this way, only the one component installed on the ground can measure normally. The two vertically installed components shake greatly due to problems such as the fixing method and their own weight, which seriously affects the measurement performance and accuracy of these two components, and ultimately affects the measurement accuracy and performance of the entire three-component rotation seismograph. Summary of the invention

[0012] In view of the problems existing in the prior art, the object of the present invention is to provide a regular triangular pyramid type three-component rotational seismograph, which greatly improves the overall performance of the three-component rotational seismograph.

[0013] The technical solution of the present invention is:

[0014] A regular triangular pyramid type three-component rotational seismograph, characterized in that it comprises a regular triangular pyramid structure consisting of three side plates 2, a top plate 1 and a bottom plate 6, three fiber optic gyroscope modules 4, three light source modules and three circuit solution modules; one fiber optic gyroscope module 4 is installed on each side of the regular triangular pyramid structure, and the sensitive axis of the fiber optic gyroscope module 4 is perpendicular to the installation surface on which it is located.

[0015] Furthermore, a fiber optic gyroscope base 3 is provided on each side surface of the regular triangular pyramid structure for mounting the fiber optic gyroscope module 4 .

[0016] Furthermore, three fiber optic gyroscope housings 5 ​​are included. After the fiber optic gyroscope module 4 is installed on the fiber optic gyroscope base 3 on each side, a fiber optic gyroscope housing 5 is connected to improve the stability of the fiber optic gyroscope module 4.

[0017] Furthermore, the bottom plate 6 is connected to one end of the three side plates 2, and the top plate 1 is connected to the other end of the three side plates 2, forming the regular triangular pyramid structure.

[0018] Furthermore, the side panel 2 is an octagon, the top panel 1 is a hexagon, and the bottom panel 6 is a regular hexagon; the non-adjacent edges of the bottom panel 6 are used to connect one end of the side panel 2, and the non-adjacent edges of the top panel 1 are connected to the other end of the side panel 2.

[0019] Furthermore, the fiber optic gyroscope module 4 includes a fiber optic gyroscope skeleton 40, a fiber optic ring 41, an optical path box 42, a circuit board 43, an optical waveguide 44 and a connecting copper column 45. The fiber optic ring 41 is wound on the fiber optic gyroscope skeleton 40 along the periphery of the fiber optic gyroscope skeleton 40, and both ends of the fiber optic ring 41 are introduced into the optical path box 42. The optical waveguide 44, the circuit board 43 and the connecting copper column 45 are all arranged inside the optical path box 42. The optical waveguide 44 is connected to the inner wall of the optical path box 42, the circuit board 43 is connected to the inner wall of the optical path box 42 through the connecting copper column 45, and the circuit board 43 is connected to both ends of the fiber optic ring 41 through the optical waveguide 44.

[0020] The key points of the present invention are as follows:

[0021] 1. Dual-ring optical path application

[0022] The present invention applies the interferometric fiber optic gyroscope optical path of the dual-ring structure to the three-component rotational seismometer for the first time, significantly improving the sensitivity and stability of the system and overcoming the problem of insufficient stability of the existing dual-polarization optical path.

[0023] 2. Regular triangular pyramid spatial configuration

[0024] The three-component fiber optic rotation seismometer is innovatively designed as a regular triangular pyramid space configuration. Compared with the existing orthogonal assembly method, this configuration effectively reduces the performance loss caused by shaking during the installation process and ensures the measurement stability of each component.

[0025] 3. Symmetrical structure improves consistency

[0026] Through the symmetrical design of the regular triangular pyramid, each component of the fiber optic gyroscope has a completely consistent physical environment and installation conditions, which significantly improves the consistency between the measurement data and enhances the performance of the overall instrument.

[0027] The advantages of the present invention are as follows:

[0028] 1. Balance between sensitivity and stability

[0029] The dual-ring optical path structure significantly enhances system stability while improving sensitivity, avoiding measurement errors caused by polarization-related problems in existing technologies.

[0030] 2. Improved measurement accuracy

[0031] The use of a regular triangular pyramid configuration design reduces the possibility of the vertical component being affected by gravity or other external forces, thereby improving the measurement accuracy of the three components.

[0032] 3. Consistency and repeatability

[0033] Since the three components are completely symmetrical in space, the repeatability and consistency of the instrument are significantly improved and can be used for higher-precision seismic observations.

[0034] 4. Stable structure and strong anti-interference ability

[0035] The modular design and compact structural arrangement effectively reduce the impact of environmental interference on the performance of the fiber optic gyroscope and extend the service life of the instrument.

[0036] 5. Potential application expansion

[0037] The present invention is not only suitable for the measurement of earthquake rotational motion, but also has the potential to be expanded to other rotation monitoring scenarios (such as bridge vibration monitoring and building structural health monitoring). BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A conventional three-component orthogonal seismograph.

[0039] Figure 2 This is an appearance diagram of a three-component rotational seismograph of the present invention;

[0040] (a) Front view, (b) Top view.

[0041] Figure 3 It is a specific structural diagram of the three-component rotational seismograph of the present invention.

[0042] Figure 4 This is the structure diagram of the fiber optic gyroscope module.

[0043] Figure numerals: 1-top plate, 2-side plate, 3-fiber optic gyroscope base, 4-fiber optic gyroscope module, 5-fiber optic gyroscope housing, 6-bottom plate; 40-fiber optic gyroscope skeleton, 41-fiber optic ring, 42-optical path box, 43-circuit board, 44-optical waveguide, 45-connecting copper column. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0045] The solution proposed by the present invention is a three-component rotation seismograph with a regular triangular pyramid spatial configuration, the front view and top view of which are as follows: Figure 2 As shown in Figure 2, this scheme can greatly improve the stability of each component of the rotating seismometer, thereby improving the overall performance. At the same time, since the three components are completely symmetrical in space, the consistency between them will be greatly improved, which will help improve the overall performance.

[0046] Specifically, the present application provides a regular triangular pyramid type three-component rotation seismograph, such as Figure 3As shown, it includes: three fiber optic gyroscope modules 4, three light source modules, three circuit solving modules, three side panels 2, a top panel 1 and a bottom panel 6. Among them, the mounting surfaces of the three fiber optic gyroscope modules 4 are three side surfaces of a regular triangular pyramid, and the mounting axis (sensitive axis) of each fiber optic gyroscope module 4 is perpendicular to the mounting surface on which it is located.

[0047] During installation and use, first connect the bottom plate 6 and the three side plates 2, and then install the top plate 1 on the top to fix the three side plates 2. Such installation can ensure the stability of the regular triangular pyramid type three-component rotational seismograph. Furthermore, the fiber optic gyroscope module 4 of each component is installed on the fiber optic gyroscope base 3, and the fiber optic gyroscope base 3 is connected to the side plate 2 by screws. After the fiber optic gyroscope module 4 is installed, its corresponding fiber optic gyroscope housing 5 is connected to the fiber optic gyroscope base 3 by screws. This connection method can ensure the stability of the three-component fiber gyroscope to the greatest extent, and minimize the impact of environmental factors on the performance of the three-component rotational seismograph.

[0048] Specifically, Figure 4 As shown, the fiber optic gyroscope module 4 includes: a fiber optic gyroscope skeleton 40, a fiber optic ring 41, an optical path box 42, a circuit board 43, an optical waveguide 44 and a connecting copper column 45. The fiber optic ring 41 is arranged along the periphery of the fiber optic gyroscope skeleton 40 and is wound around the fiber optic gyroscope skeleton 40. Both ends of the fiber optic ring 41 are introduced into the optical path box 42. The optical waveguide 44, the circuit board 43 and the connecting copper column 45 are all arranged inside the optical path box 42. The optical waveguide 44 is connected to the inner wall of the optical path box 42. The circuit board 43 is connected to the inner wall of the optical path box 42 through the connecting copper column 45. The circuit board 43 is connected to both ends of the fiber optic ring 41 through the optical waveguide 44.

[0049] The main innovation of this solution lies in the spatial configuration of the regular triangular pyramid. In addition, changes in the optical path (such as single polarization optical path, dual polarization optical path), changes in the connection method (elastic connector, polymer material connection), changes in the gyroscope type (open-loop fiber optic gyroscope, closed-loop fiber optic gyroscope), changes in the used materials, etc. can all be considered as alternative solutions.

[0050] Although the specific embodiments of the present invention are disclosed for the purpose of illustration, the purpose is to help understand the content of the present invention and implement it accordingly, those skilled in the art will understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the content disclosed in the best embodiment, and the scope of the present invention is subject to the scope defined in the claims.

Claims

1. A regular triangular pyramid type three-component rotational seismograph, characterized in that: The invention comprises a regular triangular pyramid structure consisting of three side plates (2), a top plate (1) and a bottom plate (6), three fiber optic gyroscope modules (4), three light source modules and three circuit solving modules; one fiber optic gyroscope module (4) is installed on each side surface of the regular triangular pyramid structure, and the sensitive axis of the fiber optic gyroscope module (4) is perpendicular to the installation surface on which it is located.

2. The regular triangular pyramid three-component rotational seismograph according to claim 1, characterized in that: A fiber optic gyroscope base (3) is provided on each side surface of the regular triangular pyramid structure for mounting the fiber optic gyroscope module (4).

3. The regular triangular pyramid three-component rotational seismograph according to claim 2, characterized in that: It also comprises three fiber optic gyroscope housings (5), and a fiber optic gyroscope housing (5) is connected to the fiber optic gyroscope base (3) on each side after the fiber optic gyroscope module (4) is installed, so as to improve the stability of the fiber optic gyroscope module (4).

4. The regular triangular pyramid type three-component rotational seismograph according to claim 1, 2 or 3, characterized in that: The bottom plate (6) is connected to one end of the three side plates (2), and the top plate (1) is connected to the other end of the three side plates (2), thereby forming the regular triangular pyramid structure.

5. The regular triangular pyramid type three-component rotational seismograph according to claim 1, 2 or 3, characterized in that: The side plate (2) is an octagon, the top plate (1) is a hexagon, and the bottom plate (6) is a regular hexagon; non-adjacent edges of the bottom plate (6) are used to connect one end of the side plate (2), and non-adjacent edges of the top plate (1) are connected to the other end of the side plate (2).

6. The regular triangular pyramid type three-component rotational seismograph according to claim 1, 2 or 3, characterized in that: The fiber optic gyroscope module (4) comprises a fiber optic gyroscope frame (40), a fiber optic ring (41), an optical path box (42), a circuit board (43), an optical waveguide (44) and a connecting copper column (45); the fiber optic ring (41) is wound around the fiber optic gyroscope frame (40) along the outer circumference of the fiber optic gyroscope frame (40); two ends of the fiber optic ring (41) are introduced into the optical path box (42); the optical waveguide (44), the circuit board (43) and the connecting copper column (45) are all arranged inside the optical path box (42); the optical waveguide (44) is connected to the inner wall of the optical path box (42); the circuit board (43) is connected to the inner wall of the optical path box (42) via the connecting copper column (45); and the circuit board (43) is connected to the two ends of the fiber optic ring (41) via the optical waveguide (44).

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