Fiber bragg grating demodulator shell

Abstract

The utility model discloses a fiber bragg grating demodulator shell, which is used for installing an optical path system and a circuit module of a fiber bragg grating demodulator and comprises a first installation plate, a front panel and a top shell, the front panel and the top shell are fixedly installed with the first installation plate, and the first installation plate, the front panel and the top shell form a cavity for accommodating the optical path system and the circuit module. The circuit module is arranged on the surface of the first mounting plate, and the light path system and the first mounting plate are fixedly mounted. According to the fiber bragg grating demodulator shell provided by the utility model, integrated installation in a train 3U case is realized, and the problem of 3U miniaturization is solved. And aiming at a 3U case structure, an optical fiber connector, a communication interface and a multifunctional structure which need to be wired and plugged are respectively exposed, so that quick plugging and wiring are facilitated, and quick access of equipment is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber Bragg grating demodulators, and in particular relates to a housing of an optical fiber Bragg grating demodulator. Background Art

[0002] The fiber Bragg grating demodulator uses the frequency-selective reflection and transmission of the optical signal by the fiber Bragg grating to resolve the input optical signal into a series of spectral components of specific frequencies. Then, the relevant information of the input optical signal is obtained by demodulating and detecting it through devices such as spectrometers or photodiodes. The working principle of the fiber Bragg grating is to use the periodic refractive index changes in the optical fiber to form reflected light strips. These strips are within the visible light or near-infrared spectrum, and their frequency intervals can be achieved by adjusting the manufacturing parameters of the fiber Bragg grating.

[0003] Fiber Bragg grating interrogators are widely used in many fields, including long-term health monitoring of bridges, dams, buildings, etc., damage and danger assessment of dams, roads, and bridges in earthquake-affected areas, continuous monitoring of the structural integrity of ships and aircraft, and measurements in electromagnetic fields or harsh corrosion environments. Among them, in the application scenario of monitoring optical fibers in train carriages, existing fiber Bragg grating interrogators cannot be integrated in the 3U chassis of the train, and it is difficult to quickly plug and unplug during operation, and the equipment cannot be quickly accessed.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a fiber grating demodulator housing.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The utility model aims to provide a fiber optic Bragg grating demodulator housing, which can solve the problem that the existing fiber optic Bragg grating demodulator cannot be applied to train compartment optical fiber monitoring.

[0007] In order to achieve the above-mentioned purpose, a specific embodiment of the utility model provides a fiber optic Bragg grating demodulator housing for installing an optical path system and a circuit module of the fiber optic Bragg grating demodulator, the housing comprising a first mounting plate and a front panel and a top shell fixedly mounted to the first mounting plate, the first mounting plate, the front panel and the top shell forming a cavity for accommodating the optical path system and the circuit module, the circuit module being arranged on the surface of the first mounting plate, and the optical path system being fixedly mounted to the first mounting plate.

[0008] In one or more embodiments of the present invention, a fiber optic connector connected to the optical path system is installed on the front panel.

[0009] In one or more embodiments of the present invention, a communication interface connected to the circuit module is installed on the front panel.

[0010] In one or more embodiments of the present invention, a multifunctional interface connected to the circuit module is installed on a side of the first mounting plate away from the front panel, and the top shell is provided with a making way groove for making way for the multifunctional interface.

[0011] In one or more embodiments of the present invention, a ventilation slot is provided on the top shell.

[0012] In one or more embodiments of the present invention, the front panel at least partially protrudes from the intersection line of the front panel and the top shell or the first mounting plate.

[0013] In one or more embodiments of the present invention, a bracket is mounted on the first mounting plate, and the optical path system is fixedly mounted on the bracket.

[0014] In one or more embodiments of the present invention, the bracket includes a column mounted on a first mounting plate and a second mounting plate fixedly mounted to the column, and the optical path system is fixedly mounted on the second mounting plate.

[0015] In one or more embodiments of the present invention, a handle is installed on the front panel.

[0016] In one or more embodiments of the present invention, the first mounting board is a PCB circuit board.

[0017] Compared with the prior art, the fiber Bragg grating demodulator housing of the utility model can be integrated and installed in the 3U chassis of the train, solving the problem that the existing demodulator equipment is not suitable for 3U miniaturization. In view of the actual structure of the 3U chassis, the optical fiber connector, communication interface and multi-function interface that need to be wired and plugged are exposed, which is convenient for quick plugging and wiring, and realizes the rapid access of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural diagram of the housing of the fiber Bragg grating demodulator in one embodiment of the utility model.

[0020] Figure 2This is another structural diagram of the housing of the fiber Bragg grating demodulator in one embodiment of the utility model.

[0021] Figure 3 This is a diagram showing the internal structure of a housing of a fiber Bragg grating demodulator in one embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] The words "coupled" or "connected" or "connected" in the specification include both direct connection and indirect connection. Indirect connection is a connection through an intermediate medium, such as a connection through an electrically conductive medium, which may have parasitic inductance or parasitic capacitance; indirect connection may also include connection through other active or passive devices on the basis of achieving the same or similar functional purposes, such as connection through circuits or components such as switches and follower circuits. In addition, in the present utility model, words such as "first" and "second" are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply that there is a certain actual relationship, quantity or order between these technical features.

[0024] like Figure 1 As shown, the housing of the fiber Bragg grating demodulator in one embodiment of the utility model is used to install the optical path system and circuit module of the fiber Bragg grating demodulator. The optical path system of the fiber Bragg grating demodulator includes a laser and an optical path module. The optical path module is used to transmit the laser generated by the laser to the external grating and receive the reflected light reflected by the external grating. Since when light of a specific wavelength passes through the fiber Bragg grating, it is modulated by the periodic refractive index change and produces a diffraction effect, information can be further extracted by measuring the wavelength and amplitude of the reflected or transmitted spectrum. The circuit module is used to drive the laser and convert the reflected light into an electrical signal containing the fiber optic sensing information.

[0025] The housing includes a first mounting plate 1, a front panel 2 and a top shell 3 fixedly mounted on the first mounting plate 1. The first mounting plate 1, the front panel 2 and the top shell 3 form a cavity for accommodating an optical path system and a circuit module. The circuit module is arranged on the surface of the first mounting plate 1, and the optical path system is fixedly mounted on the first mounting plate 1. In one embodiment, the housing of the fiber Bragg grating interrogator is installed in a 3U chassis, the first mounting plate 1 and the top shell 3 are both located inside the chassis, and the front panel 2 is flush with the chassis opening.

[0026] like Figure 1 As shown, the front panel 2 is equipped with an optical fiber connector 41 connected to the optical path system and a communication interface 42 connected to the circuit module. The optical fiber connector 41 is used to connect the optical path system to the external grating, so that the optical path system and the external grating form a complete fiber Bragg grating sensing loop and realize the fiber Bragg grating demodulation function. The communication interface 42 is used for information transmission between the circuit module and the outside. Specifically, the communication interface 42 is a Dcode12 network port connector.

[0027] like Figure 1 and Figure 2 As shown, in one embodiment, both ends of the front panel 2 protrude from the intersection of the front panel 2 and the top shell 3. A positioning seat 45 is also provided on the side of the front panel 2 close to the top shell 3. The positioning seat 45 is located on the outside of the top shell 3. Four positioning holes are opened on the positioning seat 45, and a positioning pin 46 is fixedly installed in one of the positioning holes. When the fiber grating demodulator housing is installed in a 3U chassis, the protruding part of the front panel 2 can be fixed to the 3U chassis by bolts or other means to facilitate the fixed installation of the fiber grating demodulator. The 3U chassis is also provided with a through hole corresponding to the positioning pin 46. During installation, the positioning pin 46 is inserted into the through hole for pre-fixation to avoid accidental falling due to tilting or vibration when the fiber grating demodulator is not completely installed and fixed. In other embodiments, according to the actual installation position and installation method of the fiber grating demodulator in the chassis, any part of the front panel 2 can be made to protrude from the intersection of the front panel 2 and the top shell 3 or the intersection of the front panel 2 and the first mounting plate 1 to achieve the effect of fixed installation.

[0028] A handle 44 is installed on the front panel 2, and the handle 44 is used to pull out the fiber grating demodulator in the 3U chassis.

[0029] like Figure 1 and Figure 2 As shown, the top shell 3 includes an integrally formed top plate 31, two side plates 32 and a rear panel 33, the two side plates 32 are fixedly mounted on the first mounting plate 1, and the top plate 31 is fixedly mounted on the front panel 2. This facilitates the assembly of the fiber Bragg grating demodulator, reduces the number of components of the shell to the greatest extent, and can effectively protect the internal components from damage due to impact and vibration.

[0030] The top shell 3 is provided with ventilation slots 34 for ventilating and cooling the components inside the fiber grating demodulator. Specifically, the ventilation slots 34 are provided on the two side plates 32 .

[0031] like Figure 2As shown, a multifunctional interface 43 connected to the circuit module is installed on the side of the first mounting plate 1 away from the front panel 2, and a make way slot for the multifunctional interface 43 is provided on the rear panel 33. In one embodiment, the multifunctional interface 43 is a 64-pin socket, which is used to provide power, CAN and RS485 interfaces for the circuit module. A 64-pin connector is provided in the 3U chassis corresponding to the multifunctional socket. When the fiber grating demodulator is pushed into the chassis, the 64-pin connector can be directly inserted into the multifunctional socket. As long as the fiber grating demodulator is correctly installed, the device wiring can be completed, eliminating the need for additional plugging and unplugging and wiring actions, and realizing rapid access to the device.

[0032] like Figure 3 As shown, the first mounting board 1 is a PCB circuit board, and the circuit module is arranged on the surface of the first mounting board 1 by printing, packaging and welding. A bracket is installed on the first mounting board 1, and the optical path system is fixedly installed on the bracket.

[0033] Specifically, the bracket includes a column 51 mounted on the first mounting plate 1 and a second mounting plate 52 fixedly mounted on the column 51, and the optical path system is fixedly mounted on the second mounting plate 52. In one embodiment, four columns 51 are provided and are respectively located at four vertex corners of the second mounting plate 52. The column 51 is provided with an internal thread, and both ends of the column 51 are fixedly mounted on the first mounting plate 1 and the second mounting plate 52 by bolts.

[0034] In one embodiment, the second mounting board 52 is a PCB circuit board. When the optical path system includes circuits for driving, controlling, connecting or other functions, or the area of ​​the first mounting board 1 is not sufficient to set up the circuit module, these circuits can also be set on the second mounting board 52 by printing, packaging and welding.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fiber Bragg grating demodulator housing, used to install the optical path system and circuit module of the fiber Bragg grating demodulator, characterized in that: The shell includes a first mounting plate and a front panel and a top shell fixedly mounted to the first mounting plate. The first mounting plate, the front panel and the top shell form a cavity for accommodating an optical path system and a circuit module. The circuit module is arranged on the surface of the first mounting plate, and the optical path system is fixedly mounted to the first mounting plate.

2. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: The front panel is equipped with an optical fiber connector connected to the optical path system.

3. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: The front panel is provided with a communication interface connected with the circuit module.

4. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: A multifunctional interface connected to the circuit module is installed on a side of the first installation plate away from the front panel, and a recess for making way for the multifunctional interface is provided on the top shell.

5. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: The top shell is provided with ventilation slots.

6. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: The front panel at least partially protrudes from the intersection line of the front panel and the top shell or the first mounting plate.

7. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: A bracket is installed on the first mounting plate, and the optical path system is fixedly installed on the bracket.

8. The fiber Bragg grating demodulator housing according to claim 7, characterized in that: The bracket comprises a column mounted on a first mounting plate and a second mounting plate fixedly mounted on the column, and the optical path system is fixedly mounted on the second mounting plate.

9. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: A handle is installed on the front panel.

10. The fiber Bragg grating demodulator housing according to claim 1, characterized in that: The first mounting board is a PCB circuit board.

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