CN210400420U

CN210400420U - Fiber grating analysis device

Info

Publication number: CN210400420U
Application number: CN201921275595.6U
Authority: CN
Inventors: 张军; 郭科峰; 杨永宏; 李永军
Original assignee: Beijing Xizhuo Information Technology Co ltd
Current assignee: Beijing Xizhuo Information Technology Co ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-04-24
Anticipated expiration: 2029-08-07

Abstract

The application discloses a fiber grating analysis device, which comprises a light source device, a 1 XN splitter, a fiber grating sensor, a reflector and a processing circuit. The light source device is used for providing an optical signal; the 1 XN shunt is connected with the output end of the light source device, the 1 XN shunt is provided with N output ends, and N is more than or equal to 2; the fiber grating sensor is correspondingly connected with the output end of the 1 XN branching unit; the reflector is connected with the output end of the unconnected fiber grating sensor of the 1 XN branching unit; the processing circuit is connected to a 1 × N splitter. By means of the method, the condition that the human beings and other external factors generate light loss can be judged, so that whether the data generated by the fiber grating sensor is accurate or not can be effectively determined, and the detection accuracy of the fiber sensing analysis device can be improved.

Description

Fiber grating analysis device

Technical Field

The application relates to the technical field of optical fiber sensors, in particular to an optical fiber grating analysis device.

Background

With the continuous development of science and technology, monitoring in various fields such as high-speed rail, aerospace and the like is obviously important. The fiber grating sensor is prepared by forming gratings in optical fibers, has the advantages of simple structure, small volume, electromagnetic interference resistance, corrosion resistance, high sensitivity, high resolution and the like, and is widely applied to many fields.

The inventor of the present application finds, in long-term research and development, that an existing optical fiber sensing analyzer is based on a tunable filter principle or a CCD (Charge Coupled Device) principle, and interference of man-made external environments and the like cannot be eliminated in a detection process by the optical fiber sensing analyzer, so that inaccurate or even complete errors of detected data are easily caused, and detection accuracy of the optical fiber sensing analyzer is easily affected.

SUMMERY OF THE UTILITY MODEL

The application provides an optical fiber sensing analysis device to solve the technical problem that external factor interference cannot be excluded in the prior art to cause low detection accuracy.

In order to solve the above technical problem, one technical solution adopted by the present application is to provide an optical fiber crack sensor, including:

a light source device for providing an optical signal;

the 1 xN shunt is connected with the output end of the light source device, the 1 xN shunt is provided with N output ends, and N is more than or equal to 2;

the fiber grating sensor is correspondingly connected with the output end of the 1 XN branching unit;

the reflector is connected with the output end of the 1 xN splitter, which is not connected with the fiber grating sensor;

and the processing circuit is connected with the 1 xN splitter.

The number of the reflectors is M, the number of the fiber grating sensors is N-M, M is more than or equal to 1 and less than N, and the N-M fiber grating sensors and optical fibers connected with the M reflectors are in the same multi-core optical cable.

The fiber grating analysis device further comprises a passive device, and the passive device is connected with the light source device.

Wherein the passive device is a CWDM device.

The processing circuit further comprises a photoelectric converter and an upper computer, one end of the photoelectric converter is connected with the passive device, the other end of the photoelectric converter is connected with the upper computer, and the photoelectric converter is used for converting optical signals received by the 1 xN splitter into electric signals.

The processing circuit further comprises a data acquisition unit, one end of the data acquisition unit is connected with the photoelectric converter, the other end of the data acquisition unit is connected with the upper computer, and the data acquisition unit is used for providing acquisition speed.

The processing circuit further comprises an alarm, and the alarm is connected with the upper computer.

The beneficial effect of this application is: the optical signal is divided into N paths of channels through a 1 XN splitter, the fiber grating sensor is connected with equipment to be monitored through optical fibers corresponding to the corresponding channels, and a reflector is arranged at the tail end, so that the optical signals of the fiber grating sensor and the reflector are reflected at the same time and return to a processing circuit, and the processing circuit correspondingly analyzes information respectively reflected by the fiber grating sensor and the reflector. Because the fiber grating sensor can detect the interference of temperature, stress and the like, and the reflector is not interfered by the temperature and the stress, the reflector only generates loss under the interference of external factors such as human factors and the like. By means of the method, the condition that the human beings and other external factors generate light loss can be judged, so that whether the data generated by the fiber grating sensor is accurate or not can be effectively determined, and the detection accuracy of the fiber sensing analysis device can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic structural diagram of an embodiment of a fiber grating analyzer according to the present application;

FIG. 2 is a schematic structural diagram of another embodiment of a fiber grating analyzer according to the present application;

FIG. 3 is a schematic structural diagram of rising/falling edges of light waves generated by passive devices according to an embodiment of the fiber grating analyzer of the present application;

FIG. 4 is a schematic structural diagram of another embodiment of the fiber grating analyzer of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, an embodiment of the present application provides a fiber grating analyzer 100, where the fiber grating analyzer 100 includes a light source device 10, a 1 × N splitter 20, a fiber grating sensor 30, a reflector 40, and a processing circuit 50.

The light source device 10 is used to provide an optical signal, and for example, the light source device 10 may be an Amplified Spontaneous Emission (ASE) emitting light source, a high-power laser light source, or the like. The 1 xn splitter 20 is connected to the output of the light source device 10. The 1 XN splitter 20 has N outputs, N ≧ 2, for example, N may be 4, 6, 12, etc., which may be specifically set as desired, and is not limited herein. The 1 × N splitter 20 is capable of receiving the optical signal from the light source device 10 and splitting the optical signal into N paths for output. It will be appreciated that the 1 xn splitter 20 provides N channels for transmitting optical signals. The fiber grating sensors 30 are connected to the output end of the 1 × N splitter 20, the number of the fiber grating sensors 30 may be multiple, and each fiber grating sensor 30 is connected to one output end of the 1 × N splitter 20. The Fiber Grating sensor 30 may be an FBG (Fiber Bragg Grating) or the like. The fiber grating sensor 30 may be used for detecting an object to be monitored, such as stress or temperature monitoring of high-speed rail or aviation equipment.

The reflector 40 is connected to the output of the 1 xn splitter 20 to which the fiber grating sensor 30 is not connected. The reflector 40 is used to reflect a stable reflected optical signal, such as a stable reflected optical power. The reflector 40 may be a faraday rotator mirror or the like. Since the reflector 40 is not affected by the same factors such as stress and temperature as the fiber grating sensor 30, the wavelength and power of light returned by the reflector 40 are not changed under normal conditions such as artificial bending. The processing circuit 50 is connected to the 1 × N splitter 20. The processing circuit 50 is used for processing the optical signals reflected by the fiber grating sensor 30 and the reflector 40, and further analyzing whether the detection by the reflector 40 and the fiber grating sensor 30 is accurate. For example, when the processing circuit 50 analyzes and finds that the optical signal reflected by the reflector 40 is severely attenuated, it can be determined that the external interference such as man-made interference occurs.

It is understood that the 1 × N splitter 20 splits the optical signal into N channels, the fiber grating sensor 30 is connected to the device to be monitored through the optical fiber corresponding to the corresponding channels, and the reflector 40 is disposed at the end, so that the optical signals of the fiber grating sensor 30 and the reflector 40 can be reflected simultaneously and will be returned to the processing circuit 50, and the processing circuit 50 correspondingly analyzes the information reflected by the fiber grating sensor 30 and the reflector 40 respectively. Since the fiber grating sensor 30 can detect the interference of temperature and stress, etc., and the reflector 40 is not interfered by temperature and stress, the reflector 40 only generates loss under the interference of external factors such as human beings, etc., so that the loss of light generated by external factors such as human beings and the loss of light reflected by the fiber grating sensor 30 can be distinguished.

By means of the method, the condition that the human beings and other external factors generate light loss can be judged, so that whether the data generated by the fiber grating sensor 30 are accurate or not can be effectively determined, and the detection accuracy of the fiber sensing analysis device 100 can be improved.

In some embodiments, there are M reflectors 40, for example, there may be 1, 2, 3, etc. The number of the fiber grating sensors 30 is N-M, M is more than or equal to 1 and less than N, and M is a natural number. It will be appreciated that the sum of the number of fiber grating sensors 30 and the number of reflectors 40 is exactly equal to the number of outputs of the 1 xn splitter 20. The M reflectors 40 are in the same multicore cable with the fibers connected to the N-M fiber grating sensors 30. It can be understood that the optical fibers connected with the reflector 40 and the optical fibers connected with the N-M fiber grating sensors 30 are wrapped in the same multi-core optical cable, so that the interference of external factors such as human factors on the whole optical cable can be judged. Of course, the number of reflectors 40 may be less than the number of fiber grating sensors 30, and the reflectors 40 are spaced apart from the fiber grating sensors 30 when viewed in a cross-section of the optical cable.

By the aid of the mode, the optical cable can be monitored in all directions, and detection precision and accuracy of the optical fiber sensing analysis device 100 are further improved.

In some embodiments, referring to fig. 2 and 3, the fiber grating analysis apparatus 100 may further include a passive device 60, and the passive device 60 is connected to the light source device 10. The other end of the passive device 60 is connected to a 1 xn splitter 20. The passive device 60 is used to convert an optical signal into an optical signal having rising and/or falling edges, for example an optical source where the wavelength of the optical signal may vary from 1530nm to 1540 nm. The passive device 60 can change the constant optical signal generated by the light source device 10 into a varying optical signal, so that accurate monitoring can be realized.

Alternatively, the passive device 60 may be a CWDM (Coarse Wavelength division multiplexing) device. Of course other devices capable of implementing a variable light source are possible.

In some embodiments, with continued reference to fig. 2, the processing circuit 50 may further include a photoelectric converter 51 and an upper computer 52, wherein one end of the photoelectric converter 51 is connected to the passive device 60, and the other end is connected to the upper computer 52. The photoelectric converter 51 is configured to convert the optical signal received from the 1 × N splitter 20 into an electrical signal. It is understood that the optical-to-electrical converter 51 can convert the optical power signal received from the 1 xn splitter 20 into a voltage signal, and then transmit the electrical signal to the upper computer 52, and the upper computer 52 further processes the electrical signal.

In some embodiments, referring to fig. 4, the processing circuit 50 may further include a data collector 53, one end of the data collector 53 is connected to the photoelectric converter 51, and the other end is connected to the upper computer 52, and the data collector 53 is configured to provide a collecting speed. It will be appreciated that the data collector 53 may provide a rate of 1 GHz.

In some embodiments, the processing circuit 50 may further include an alarm (not shown) connected to the host computer 52. It can be understood that a preset power value can be preset, and when the power value obtained by processing the signal reflected by the reflector 40 by the upper computer 52 is smaller than the preset power value, it indicates that the optical cable receives artificial interference, so that an alarm can be given through an alarm, for example, the alarm can be realized through flashing or voice, and further, a relevant person can be notified that the detection of the fiber grating sensor 30 is interfered.

This application receives the light source that comes from light source device 10 through the CWDM device and in order to produce the light signal that changes, divide into multichannel transmission to fiber grating sensor 30 and reflector 40 by 1N branching unit 20 with this changed light signal, the light signal that fiber grating sensor 30 and reflector 40 reflect back converts the signal of telecommunication into through photoelectric converter 51, further promote the collection speed through data collection ware 53, then convey to host computer 52 and handle, can realize carrying out power demodulation to the wavelength of reflection through above-mentioned mode, can realize the collection of high rate, and can realize monitoring optical path loss to external factors such as people, the detection accuracy of fiber sensing analytical equipment 100 has effectively been promoted.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A fiber grating analyzer, comprising:

a light source device for providing an optical signal;

and the processing circuit is connected with the 1 xN splitter.

2. The fiber grating analysis device of claim 1, wherein the number of the reflectors is M, the number of the fiber grating sensors is N-M, M is greater than or equal to 1 and less than N, and the N-M fiber grating sensors and the fibers connected to the M reflectors are in the same multi-core optical cable.

3. The fiber grating analysis device of claim 2, further comprising a passive device, the passive device being connected to the light source device.

4. The fiber grating analysis device of claim 3, wherein the passive device is a CWDM device.

5. The fiber grating analysis device of claim 3, wherein the processing circuit further comprises a photoelectric converter and an upper computer, wherein one end of the photoelectric converter is connected to the passive device, and the other end of the photoelectric converter is connected to the upper computer, and the photoelectric converter is configured to convert the optical signal received from the 1 XN splitter into an electrical signal.

6. The fiber grating analysis device of claim 5, wherein the processing circuit further comprises a data collector, one end of the data collector is connected with the photoelectric converter, the other end of the data collector is connected with the upper computer, and the data collector is used for providing collection speed.

7. The fiber grating analysis device of claim 6, wherein the processing circuit further comprises an alarm, and the alarm is connected with the upper computer.