Optical fiber Fabry-Perot pressure sensor capable of eliminating interference of third cavity

Abstract

The utility model relates to the technical field of pressure sensors, in particular to an optical fiber Fabry-Perot pressure sensor capable of eliminating third cavity interference, which comprises a sensor body, two protective shells are respectively arranged on the outer surface of the sensor body, and one ends of the two protective shells are fixedly connected through a folding plate. The other ends of the two protective shells are fixedly connected with a first fixing plate and a second fixing plate respectively, the side face of the first fixing plate is fixedly connected with a clamping plate, the side face of the second fixing plate is provided with a clamping groove, and the inner surface walls of the two protective shells are fixedly connected with shielding plates. The two protective shells are arranged on the outer surface of the sensor body, the two protective shells are mutually connected through the folding plate, the clamping plates are matched with the clamping grooves, the sensor can be conveniently installed on the side face of the sensor, and in addition, the shielding plates are arranged on the inner surfaces of the two protective shells to prevent external signals from interfering with internal equipment; and therefore, the safety and the use convenience are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure sensor technical field, concretely is a kind of optical fiber Fabry pressure sensor of eliminating third cavity interference. BACKGROUND

[0002] The main sensing structure of optical fiber Fabry pressure sensor is the Fabry-Perot cavity composed of two reflecting planes, and the cavity length of the Fabry pressure sensor changes under the action of external pressure, and the change of external pressure can be obtained by demodulating the change of cavity length. According to the different structures of the optical fiber Fabry sensor, the optical fiber Fabry sensor can be divided into intrinsic optical fiber Fabry sensor, extrinsic optical fiber Fabry sensor and linear composite cavity optical fiber Fabry sensor.

[0003] Prior art, such as: CN216669109U an anti-interference pressure sensor, the inner wall of shell is sequentially provided with anti-interference layer one and anti-interference layer two, wherein the material of anti-interference layer one is high magnetic conductive material, high magnetic conductive material is used as shielding layer to make low-frequency interference magnetic force line pass through the magnetic shielding layer with small magnetic resistance, so that the circuit inside the low-frequency magnetic shielding layer is not affected by the low-frequency magnetic field coupling interference.

[0004] However, there are still some deficiencies in the use of the device:

[0005] 1. When installing and using the sensor, its protective performance is relatively weak, although the sensor is protected by an anti-interference layer, but when encountering external impact, the sensor may still be directly collided, which undoubtedly reduces its safety.

[0006] 2. The stability of the external part of the sensor is poor during operation, because they can be deployed in various working environments, and when facing harsh conditions, the sensor is difficult to maintain a stable working state, which makes it difficult to ensure the accuracy and reliability of the measurement data. INVENTION CONTENTS

[0007] The utility model aims at providing a kind of optical fiber Fabry pressure sensor of eliminating third cavity interference to solve the problem that the protective performance of the sensor is relatively weak when installing and using the sensor in the above background technology, although the sensor is protected by an anti-interference layer, but when encountering external impact, the sensor may still be directly collided, which undoubtedly reduces its safety, the stability of the external part of the sensor is poor during operation, because they can be deployed in various working environments, and when facing harsh conditions, the sensor is difficult to maintain a stable working state, which makes it difficult to ensure the accuracy and reliability of the measurement data.

[0008] To achieve the above purpose, the utility model provides the following technical scheme:

[0009] The utility model provides a kind of optical fiber Fabry pressure sensor of eliminating third cavity interference, including sensor body, the outer surface of the sensor body is provided with two protective shells respectively, one end of two protective shells is fixedly connected by folding plate, the other end of two protective shells is fixedly connected with first fixed plate and second fixed plate respectively, the side of first fixed plate is fixedly connected with clamping plate, the side of second fixed plate is equipped with clamping groove, first fixed plate and second fixed plate position are opposite, clamping plate extends into clamping groove and is clamped with clamping groove, the inner surface wall of two protective shells is fixedly connected with shielding plate.

[0010] As the preferred scheme of the utility model, the bottom of the sensor body is clamped with a connecting barrel, the outer surface of the connecting barrel is fixedly connected with a mounting barrel, the bottom of the mounting barrel is fixedly connected with a wire tube, and the wire tube is provided with a connecting wire.

[0011] As the preferred scheme of the utility model, the outer surface of the mounting barrel is respectively threadedly connected with a first nut and a second nut, the first nut is located at the bottom of the second nut, and the bottom of each protective shell is clamped with the second nut.

[0012] As the preferred scheme of the utility model, the top and bottom of the first nut and the second nut are respectively fixedly connected with engaging plates, and the two engaging plates are engaged.

[0013] As the preferred scheme of the utility model, the outer surface of each protective shell is fixedly connected with a reinforcing plate, and the material of the reinforcing plate is stainless steel.

[0014] As the preferred scheme of the utility model, the side of the sensor body is fixedly connected with a sealing plate, and the sealing plate is located between the two protective shells.

[0015] As the preferred scheme of the utility model, the first nut and the second nut are of the same size, and the material of the second nut and the first nut is brass.

[0016] As the preferred scheme of the utility model, the wire tube is communicated with the connecting barrel, and the connecting wire is electrically connected with the sensor body through the connecting barrel.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1、In the utility model, by setting the cooperation of protective shell, folding plate, shielding plate, clamping plate and clamping groove, by equipping the outer surface of the sensor body with two protective shells, the two protective shells are connected with each other through the folding plate, the cooperation of clamping plate and clamping groove is utilized, and the sensor is conveniently installed on the side, in addition, the inner surface of the two protective shells is provided with a shielding plate, so as to prevent external signal interference to internal equipment, thereby improving safety and convenience of use.

[0019] 2、The utility model discloses, through the cooperation of connecting barrel, installation barrel, first nut, second nut and meshing board, connecting barrel, installation barrel and line pipe are interconnected, thereby facilitating the connection of connecting wire and sensor body. The protective shell is fixedly connected with the second nut, which is convenient for adjustment. The first nut and the second nut are meshed with each other through the meshing plate, further enhancing the stability of the whole. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the whole structure schematic diagram of the utility model;

[0021] Figure 2 It is the sensor side structure schematic diagram of the utility model;

[0022] Figure 3 It is the protective shell dismounting structure schematic diagram of the utility model;

[0023] Figure 4 It is the protective shell cross section structure schematic diagram of the utility model.

[0024] In the drawing: 1, sensor body;2, protective shell;3, reinforcing plate;4, installation barrel;5, first nut;6, second nut;7, line pipe;8, connecting wire;9, sealing plate;10, connecting barrel;11, meshing plate;12, shielding plate;13, folding plate;14, first fixed plate;15, second fixed plate;16, clamping plate;17, clamping groove. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] Embodiment, please refer to Figures 1-4 The utility model provides a technical scheme:

[0027] The utility model provides a kind of optical fiber Fabry pressure sensor to eliminate third cavity interference, including sensor body 1, the outer surface of sensor body 1 is provided with two protective shell 2 respectively, one end of two protective shell 2 is fixedly connected by folding plate 13, the other end of two protective shell 2 is fixedly connected with first fixed plate 14 and second fixed plate 15 respectively, the side of first fixed plate 14 is fixedly connected with clamping plate 16, the side of second fixed plate 15 is provided with clamping groove 17, first fixed plate 14 and second fixed plate 15 position is opposite, clamping plate 16 extends into clamping groove 17 and is clamped with clamping groove 17, the inner surface wall of two protective shell 2 is fixedly connected with shielding plate 12, the bottom of sensor body 1 is clamped with connecting cylinder 10, the outer surface of connecting cylinder 10 is fixedly connected with mounting cylinder 4, the bottom of mounting cylinder 4 is fixedly connected with wire tube 7, and connecting line 8 is provided in wire tube 7.

[0028] Wherein, two protective shell 2 protects the outer surface of sensor body 1, two protective shell 2 is connected by folding plate 13, by the cooperation of clamping plate 16 and clamping groove 17, it is installed in the side of sensor body 1, shielding plate 12 is arranged on the inner surface of two protective shell 2, to avoid that outside signal causes interference to internal equipment.

[0029] In this embodiment, according to Figure 1 、 Figure 2 、 Figure 3 And Figure 4 It is shown that the outer surface of mounting cylinder 4 is respectively threaded with first nut 5 and second nut 6, first nut 5 is located at the bottom of second nut 6, the bottom of two protective shell 2 is clamped with second nut 6, the top and bottom of first nut 5 and second nut 6 are respectively fixedly connected with meshing plate 11, meshing between two meshing plates 11, the outer surface of two protective shell 2 is respectively fixedly connected with reinforcing plate 3, the material of reinforcing plate 3 is stainless steel, the side of sensor body 1 is fixedly connected with sealing plate 9, sealing plate 9 is located between two protective shell 2, first nut 5 and second nut 6 are same in size, the material of second nut 6 and first nut 5 is brass, wire tube 7 is communicated with connecting cylinder 10, and connecting line 8 is electrically connected with sensor body 1 by connecting cylinder 10.

[0030] Wherein, connecting cylinder 10, mounting cylinder 4 and wire tube 7 are communicated, and then connecting line 8 is convenient for connecting with sensor body 1, protective shell 2 is fixed with second nut 6, and then it is convenient to adjust, first nut 5 and second nut 6 are engaged by meshing plate 11, and then the stability is improved.

[0031] The utility model discloses a work flow: use the optical fiber fabry perot pressure sensor of eliminating third cavity interference of this scheme design when working, first check whether the equipment is normal use, connect through connecting line 8 and sensor body 1, then connecting line 8 is connected with external power, thereby the sensor body 1 is electrified and runs, through adjusting first nut 5 and second nut 6, it is convenient to carry out position fixation to protective housing 2, because two protective housing 2 carry out protection to the outer surface of sensor body 1, two protective housing 2 are connected through folding plate 13, through the cooperation of clamping plate 16 and clamping groove 17, it is convenient to install its in the side of sensor body 1, shield plate 12 is set up on the inner surface of two protective housing 2 simultaneously, avoid outside signal to cause the interference of internal equipment, and then improve security and convenience, two protective housing 2 are connected with second nut 6, and then it is convenient to disassemble, wherein connecting cylinder 10, mounting cylinder 4 and pipe 7 are communicated, and then connecting line 8 is convenient and is connected with sensor body 1, protective housing 2 and second nut 6 are fixed, and then it is convenient to adjust, first nut 5 and second nut 6 are engaged through engaging plate 11, and then improve stability.

[0032] Although the embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fiber-optic Fabry-Perot pressure sensor that eliminates third cavity interference, comprising a sensor body (1), characterized in that: The outer surface of the sensor body (1) is respectively provided with two protective shells (2), one end of the two protective shells (2) is fixedly connected through the folding plate (13), the other end of the two protective shells (2) is respectively fixedly connected with the first fixed plate (14) and the second fixed plate (15), the side surface of the first fixed plate (14) is fixedly connected with the clamping plate (16), the side surface of the second fixed plate (15) is provided with the clamping groove (17), the first fixed plate (14) and the second fixed plate (15) are opposite, the clamping plate (16) extends into the clamping groove (17) and is clamped with the clamping groove (17), the inner surface wall of the two protective shells (2) is fixedly connected with the shielding plate (12).

2. The fiber-optic Fabry-Perot pressure sensor of claim 1, wherein: The bottom of the sensor body (1) is clamped with the connecting barrel (10), the outer surface of the connecting barrel (10) is fixedly connected with the mounting barrel (4), the bottom of the mounting barrel (4) is fixedly connected with the wire tube (7), the wire tube (7) is provided with the connecting wire (8).

3. The fiber-optic Fabry-Perot pressure sensor of claim 2, wherein: The outer surface of the mounting barrel (4) is respectively screwed with the first nut (5) and the second nut (6), the first nut (5) is located at the bottom of the second nut (6), the bottom of the two protective shells (2) is clamped with the second nut (6).

4. The fiber-optic Fabry-Perot pressure sensor of claim 3, wherein: The top and bottom of the first nut (5) and the second nut (6) are respectively fixedly connected with the meshing plate (11), the two meshing plates (11) are meshed.

5. The fiber-optic Fabry-Perot pressure sensor of claim 1, wherein: The outer surface of the two protective shells (2) is respectively fixedly connected with the reinforcing plate (3), the material of the reinforcing plate (3) is stainless steel.

6. The fiber-optic Fabry-Perot pressure sensor of claim 1, wherein: The side surface of the sensor body (1) is fixedly connected with the sealing plate (9), the sealing plate (9) is located between the two protective shells (2).

7. The fiber-optic Fabry-Perot pressure sensor of claim 3, wherein: The first nut (5) and the second nut (6) are the same size, the material of the second nut (6) and the first nut (5) is brass.

8. The fiber-optic Fabry-Perot pressure sensor of claim 2, wherein: The wire tube (7) is communicated with the connecting barrel (10), the connecting wire (8) is electrically connected with the sensor body (1) through the connecting barrel (10).

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