Fiber bragg grating pressure ring device

Abstract

The utility model provides a fiber bragg grating pressure ring device, which comprises a protective cylinder body and a stress main body sleeved in the protective cylinder body, a cable joint is arranged on the protective cylinder body, a through hole is arranged in the middle of the stress main body in a penetrating manner, a plurality of groups of measuring assemblies are uniformly distributed on the side edge of the stress main body, and each measuring assembly comprises two L-shaped fixing frames. The two fixing frames are symmetrically arranged relative to the middle of the stress main body, each fixing frame comprises a supporting part and a connecting part, the fixed fiber grating sensors are arranged in parallel with the axial direction of the stress main body, a temperature sensor is arranged on one side of the stress main body, and a temperature sensor is arranged on the other side of the stress main body. The plurality of fiber grating sensors and the temperature sensor are connected in series at two ends of the cable joint. According to the fiber bragg grating pressure ring device, the L-shaped fixing frame is arranged to enlarge a deformation measurement area, so that the measurement variable quantity of the fiber bragg grating sensor is increased, and the measurement precision of the fiber bragg grating sensor is improved.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic pressure sensor technology, and in particular to a fiber optic pressure ring device. Background Technology

[0002] With the development of modern industry and science and technology, the requirements for sensing technology are becoming increasingly stringent. Fiber Bragg grating (FBG) sensors, as a new type of sensor, have gained widespread application in many fields due to their unique advantages, such as resistance to electromagnetic interference, high sensitivity, high reliability, low cost, compactness, corrosion resistance, and the ability to be embedded in smart structures. Among these, FBG pressure rings, as a special type of FBG sensor, have shown great potential in pressure measurement and are gradually becoming a research hotspot.

[0003] Traditional fiber Bragg grating pressure rings are not effective for fiber Bragg grating sensors with short gauge lengths or low sensitivity. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a fiber Bragg grating pressure ring device, which aims to solve the technical problem that the measurement effect of the fiber Bragg grating pressure ring device with short gauge length is not good in the prior art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A fiber Bragg grating pressure ring device includes a protective cylinder and a force-bearing body sleeved inside the protective cylinder. The protective cylinder is provided with a cable connector. A through hole is provided through the middle of the force-bearing body, and the force-bearing body is sleeved on a steel cable through the through hole. Multiple sets of measuring components are evenly distributed on the side of the force-bearing body. Each measuring component includes two L-shaped fixing frames and fiber Bragg grating sensors fixed on the fixing frames. The two fixing frames are symmetrically arranged about the middle of the force-bearing body. Each fixing frame includes a support part connected to one side of the force-bearing body and a connecting part for fixing the fiber Bragg grating sensors. The fixed fiber Bragg grating sensors are arranged parallel to the axial direction of the force-bearing body. A temperature sensor is provided on one side of the force-bearing body. Multiple fiber Bragg grating sensors and the temperature sensor are connected in series at both ends of the cable connector.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: By installing an L-shaped fixing frame on one side of the stressed body, wherein the L-shaped fixing frame includes a support part and a connecting part, the fiber Bragg grating sensor is fixed to the connecting part, so that the fiber Bragg grating sensor is set parallel to the axial direction of the stressed body and spaced apart from the side of the stressed body. In this way, when the stressed body is subjected to pressure and deformation, the amount of deformation is transmitted to the fiber Bragg grating sensor through the fixing frame, thereby amplifying the amount of deformation and improving the measurement accuracy of short gauge length or low sensitivity fiber Bragg gratings. Furthermore, by transmitting the amount of deformation at both ends of the stressed body to the fiber Bragg grating sensor through the L-shaped fixing frame, the measurement range of the fiber Bragg grating sensor is increased. In addition, by setting a temperature sensor, temperature measurement and compensation are realized, making the measurement accuracy of this new invention even higher.

[0008] According to one aspect of the above technical solution, the length of the connecting part is greater than the length of the fiber Bragg grating sensor, and the two ends of the fiber Bragg grating sensor are respectively fixedly connected to one side of the connecting part.

[0009] According to one aspect of the above technical solution, the fixing frame is made of indium steel.

[0010] According to one aspect of the above technical solution, the fiber optic grating sensor includes a sensor body and mounting portions that are fixedly connected to the sensor body near both ends.

[0011] According to one aspect of the above technical solution, the mounting part is welded to the connecting part.

[0012] According to one aspect of the above technical solution, the fixing frame is disposed near both ends of the force-bearing body.

[0013] According to one aspect of the above technical solution, the fixing frame is welded to the force-bearing body.

[0014] According to one aspect of the above technical solution, the fixing frame is integrally formed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the fiber optic grating pressure ring device in one embodiment of the present invention;

[0016] Figure 2 This is a front view of a fiber optic grating pressure ring device in one embodiment of the present invention;

[0017] Explanation of main component symbols: 1-Force-bearing body, 2-Fixed frame, 21-Support part, 22-Connecting part, 3-Fiber grating sensor, 31-Sensor body, 32-Mounting part, 4-Temperature sensor, 5-Through hole;

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1 to 2The fiber Bragg grating pressure ring device provided in one embodiment of this utility model includes a protective cylinder and a force-bearing body 1 sleeved inside the protective cylinder. The protective cylinder has a cable connector, and a through hole 5 is provided through the center of the force-bearing body 1. The force-bearing body 1 is sleeved on a steel cable through the through hole 5. Multiple sets of measuring components are evenly distributed on the sides of the force-bearing body 1. Each measuring component includes two L-shaped fixing frames 2 and fiber Bragg grating sensors 3 fixed on the fixing frames 2. The fixing frames 2 are integrally formed and symmetrically arranged about the center of the force-bearing body 1. Each fixing frame 2 includes a support part 21 connected to one side of the force-bearing body 1 and a connecting part 22 for fixing the fiber Bragg grating sensors 3. The length of the connecting part 22 is greater than the length of the fiber Bragg grating sensors 3. Both ends of the sensor 3 are fixedly connected to one side of the connecting part 22. During installation, the support part 21 of the fixing frame 2 is set perpendicular to one side of the force-bearing body 1. One end of the support part 21 is fixedly connected to the force-bearing body 1, and the other end is connected to the connecting part 22. The connecting part 22 is set parallel to one side of the force-bearing body 1. Similarly, another fixing frame 2 is also fixedly connected. However, in order to ensure that the fiber grating sensor 3 is parallel to the axis of the force-bearing body 1 after being installed on the fixing bracket, the opposing connecting parts 22 should be on the same straight line in the vertical direction and at the same distance and height from the force-bearing body 1. This ensures that the fiber grating sensor 3 is parallel to the axis of the force-bearing body 1 after being fixed, and that the deformation of the force-bearing body 1 after being subjected to force is accurately transmitted to the fiber grating sensor 3, thereby realizing the detection of the tension of the steel cable. In addition, a temperature sensor 4 is provided on one side of the force-bearing body 1. Multiple fiber grating sensors 3 and temperature sensors 4 are connected in series at both ends of the cable connector.

[0023] Furthermore, the fiber Bragg grating sensor 3 includes a sensor body 31 and mounting portions 32 that are fixedly connected to the sensor body 31 near both ends. By setting the mounting portions 32, the sensor body 31 is fixed to the connecting portion 22. The connection between the mounting portion 32 and the connecting portion 22 can be a bolt fastening connection, which is beneficial for the later disassembly and replacement of the fiber Bragg grating sensor 3. In this embodiment, the mounting portion 32 is welded to the connecting portion 22. By using welding, the fiber Bragg grating sensor 3 and the fixed bracket are integrated into a whole, so that the slight deformation of the entire force-bearing body 1 can be effectively transmitted to the sensor body 31.

[0024] Furthermore, in order to improve the sensitivity of the fiber optic grating pressure device, the fixing frame 2 and the force-bearing body 1 are also connected by welding.

[0025] Furthermore, in this embodiment, the fixing frame 2 is made of indium steel. Due to the high hardness of indium steel, the deformation is small when subjected to force. When the main body 1 deforms under force, it causes the fixing frame 2 to swing. At this time, due to the high hardness of the fixing frame 2, the fixing frame 2 is rigidly connected to the fiber optic grating sensor 3, so that the deformation of the main body 1 is completely transferred to the fiber optic grating sensor 3, making the measurement accuracy of the fiber optic grating pressure device higher.

[0026] In this embodiment, the support portion 21 of the fixing frame 2 is arranged near both ends of the force-bearing body 1, and the fiber optic grating sensor 3 is arranged in the middle of the force-bearing body 1. When the force-bearing body 1 is subjected to a small pressure, the two ends of the force-bearing body 1 undergo a slight deformation relative to the middle. However, since the support portion 21 of the fixing frame 2 is arranged near both ends of the force-bearing body 1, the connection end of the connecting portion 22 of the fixing frame 2 connected to the fiber optic grating sensor 3 swings around the connection end of the support portion 21 and the force-bearing body 1 as the center. This amplifies the slight deformation of the force-bearing body 1, making the deformation of the fiber optic grating sensor 3 larger, which is beneficial for the measurement of the fiber optic grating sensor 3. By setting the L-shaped fixing frame 2, the deformation obtained by increasing the deformation measurement area is greater than the change in the gauge length range of a single strain gauge. Under the same load, the wavelength change measured inside the fiber optic grating sensor 3 is increased, thereby improving the sensitivity of the fiber optic grating pressure device, which is beneficial for the measurement of the fiber optic grating sensor 3 with lower sensitivity.

[0027] One additional point to note is that in this embodiment, at least three sets of measuring components are provided, evenly distributed around one side of the force-bearing body 1, to improve the accuracy of the measurement.

[0028] In summary, the fiber Bragg grating pressure ring device in the above embodiments of this utility model increases the measurement range by installing two L-shaped fixing brackets on the force-bearing body and fixing the fiber Bragg grating sensor between the fixing brackets. When the force-bearing body is subjected to force, the slight deformation of the force-bearing body is transmitted through the force of the L-shaped fixing brackets, which increases the deformation of the fiber Bragg grating sensor, thereby improving the wavelength change measured inside the fiber Bragg grating sensor and improving the measurement accuracy. By using this amplification method, even fiber Bragg grating sensors with lower accuracy can be utilized. In addition, a temperature sensor is installed on one side of the force-bearing body for temperature measurement and compensation, thereby improving the measurement accuracy of this utility model.

[0029] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A fiber grating pressure ring device, comprising a protective cylinder and a force-bearing main body sleeved inside the protective cylinder, a cable joint is arranged on the protective cylinder, characterized in that, A through hole is provided in the middle of the force-bearing body, and the force-bearing body is sleeved on the steel cable through the through hole. Multiple sets of measuring components are evenly distributed on the side of the force-bearing body. The measuring components include two L-shaped fixing frames and fiber Bragg grating sensors fixed on the fixing frames. The two fixing frames are symmetrically arranged about the middle of the force-bearing body. The fixing frame includes a support part connected to one side of the force-bearing body and a connecting part for fixing the fiber Bragg grating sensor. The fixed fiber Bragg grating sensor is arranged parallel to the axial direction of the force-bearing body. A temperature sensor is provided on one side of the force-bearing body. Multiple fiber Bragg grating sensors and the temperature sensor are connected in series at both ends of the cable connector.

2. The fiber optic Bragg grating pressure ring apparatus of claim 1, wherein, The length of the connecting part is greater than the length of the fiber Bragg grating sensor, and the two ends of the fiber Bragg grating sensor are respectively fixedly connected to one side of the connecting part.

3. The fiber optic Bragg grating pressure ring apparatus of claim 1, wherein, The mounting bracket is made of indium steel.

4. The fiber optic Bragg grating pressure ring apparatus of claim 1, wherein, The fiber optic grating sensor includes a sensor body and mounting portions that are fixedly connected to the sensor body near both ends.

5. The fiber optic Bragg grating pressure ring apparatus of claim 4, wherein, The mounting part is welded to the connecting part.

6. The fiber optic Bragg grating pressure ring apparatus of claim 1, wherein, The fixing frame is located near both ends of the force-bearing body.

7. The fiber optic Bragg grating pressure ring apparatus of claim 1, wherein, The fixing frame is welded to the load-bearing body.

8. The fiber optic Bragg grating pressure ring apparatus of claim 1, wherein, The fixing frame is integrally molded.

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