CN211205341U - Fiber grating demodulation system - Google Patents
Fiber grating demodulation system Download PDFInfo
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- CN211205341U CN211205341U CN201922220898.4U CN201922220898U CN211205341U CN 211205341 U CN211205341 U CN 211205341U CN 201922220898 U CN201922220898 U CN 201922220898U CN 211205341 U CN211205341 U CN 211205341U
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Abstract
The fiber grating demodulation system comprises a host, an optical splitter and a plurality of slaves, wherein the host is connected with the optical splitter, the optical splitter is connected with the slaves through input optical fibers, and the slaves are distributed in an array. The utility model discloses a divide the demodulation system into the modularization, be about to the demodulation system and divide into host computer module and follow the computer module, can increase at the job site and reach extension system demodulation passageway quantity from the computer module, increase fiber grating sensor capacity and survey node figure, system's modular design can install the distributed reasonable position at the scene of system, reduces the job site optic fibre wiring degree of difficulty, increases the application range of system.
Description
Technical Field
The utility model belongs to the technical field of the fiber grating sensing, concretely relates to fiber grating demodulation system.
Background
The traditional demodulating device increases the number of access sensors by increasing the number of channels of the demodulating device. However, the difficulty of field wiring is increased by simply increasing the number of channels at the host end of the demodulation device, and since all the channels need to be connected to the host end, when the sensor position is far away from the host end position and the number of channels is large, a large number of transmission optical cables need to be added, so that the cost is increased, and the field laying difficulty and the workload of debugging and maintenance are increased. Meanwhile, the quantity of channels customized by the host is limited, and the system cannot be flexibly upgraded and reformed in the later period.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fiber grating sensor quantity can nimble fiber grating demodulation system who expands.
The fiber grating demodulation system comprises a host, an optical splitter and a plurality of slaves, wherein the host is connected with the optical splitter, the optical splitter is connected with the slaves through input optical fibers, and the slaves are distributed in an array.
Further, the slave includes an optical port adapter, an input fiber interface and an output fiber interface, the optical port adapter includes an input unit and an output unit, the input fiber interface and the output fiber interface are both fixed on a panel of the slave, the slave includes a first slave and a second slave, the input fiber passes through the input fiber interface of the first slave and is connected with the input unit of the first slave, the output unit of the first slave is connected with the output fiber, the output fiber passes through the output fiber interface of the first slave and is connected with a corresponding fiber grating sensor, or the output fiber passes through the output fiber interface of the first slave and is sequentially connected with at least one second slave, and the first slave and the second slave are respectively connected with corresponding fiber grating sensors.
Further, when the output optical fiber passes through an output optical fiber interface of the first slave machine to be connected with the second slave machine, the output optical fiber is a single multi-core optical fiber; when the output optical fiber penetrates through an output optical fiber interface of the first slave machine to be connected with the fiber bragg grating sensor, the output optical fiber is a single-core optical fiber.
Further, the input optical fiber is a single multi-core optical fiber.
Furthermore, the number of the cores of the single multi-core optical fiber is 12-144.
Furthermore, the slave machine further comprises an output optical fiber interface adapter and an output optical fiber interface card seat, the output optical fiber is fixed on the output optical fiber interface card seat through the output optical fiber interface adapter, and the output optical fiber interface card seat is detachably arranged in the slave machine.
Furthermore, a buckle is arranged outside the output optical fiber interface, and the output optical fiber is fixed outside the slave machine through the buckle.
Further, the host includes:
a laser control circuit for controlling the generation of laser light;
a transmission interface for outputting laser light into the optical splitter;
the data processing and device control chip is used for controlling the operation of the whole demodulation system;
a data storage unit for storing device parameters;
the optical circulator is used for receiving the laser passing through the input optical fiber and transmitting the laser to the fiber grating sensor, and then receiving an optical signal fed back by the fiber grating sensor according to the laser;
and the optical fiber plug-in component is used for installing and fixing the input optical fiber.
Furthermore, the fiber grating sensor at least comprises a temperature fiber grating sensor, an acceleration fiber grating sensor, a displacement fiber grating sensor, a pressure fiber grating sensor and a flow fiber grating sensor.
Further, the host demodulates the optical signal fed back by the fiber grating sensor, and obtains a wavelength signal of the fed back optical signal.
The utility model discloses a divide the demodulation system into the modularization, be about to the demodulation system and divide into host computer module and follow the computer module, can increase at the job site and reach extension system demodulation passageway quantity from the computer module, increase fiber grating sensor capacity and survey node figure, system's modular design can install the distributed reasonable position at the scene of system, reduces the job site optic fibre wiring degree of difficulty, increases the application range of system.
Drawings
FIG. 1 is a schematic diagram of the connection between the master and the slave in the exemplary wire array arrangement;
FIG. 2 is a schematic diagram showing connection between a master and a slave in an embodiment of the present invention;
FIG. 3 is a schematic diagram of connection between a master and a slave in a binary tree arrangement in the embodiment;
FIG. 4 is a schematic diagram of a master-slave connection in an embodiment;
wherein, 1, a host; 2. a first slave; 3. a second slave; 11. an upper computer; 12. and a main control module.
Detailed Description
As shown in fig. 1, the fiber grating demodulation system includes a master 1, an optical splitter and a plurality of slaves, wherein the master 1 is connected to the optical splitter, the optical splitter is connected to the slaves via input optical fibers, and the slaves are arranged in a distributed array. In this embodiment, the distributed array arrangement at least includes the master and the slaves separately arranged in a line array, a ring array, or a binary tree shape.
The slave comprises an optical port switching device, an input optical fiber interface and an output optical fiber interface, wherein the optical port switching device comprises an input unit and an output unit, the input optical fiber interface and the output optical fiber interface are both fixed on a panel of the slave machine, the slave machine comprises a first slave machine 2 and a second slave machine 3, the input optical fiber is connected with the input unit of the first slave machine 2 through the input optical fiber interface of the first slave machine 2, the output unit of the first slave machine 2 is connected with an output optical fiber, the output optical fiber passes through the output optical fiber interface of the first slave machine 2 to be connected with a corresponding fiber grating sensor, or the output optical fiber penetrates through an output optical fiber interface of the first slave machine 2 to be sequentially connected with at least one second slave machine 3, and the first slave machine 2 and the second slave machine 3 are respectively connected with corresponding fiber grating sensors.
Specifically, the first slave 2 is a slave directly connected to the master 1, the second slave 3 is a slave connected to the slave, the connection and arrangement of the slaves may be set according to the actual situation of the measurement site, when only one point needs to be monitored for temperature change or pressure change, the input optical fiber passes through the input optical fiber interface of the first slave 2 to be connected to the input unit of the first slave 2, the output unit of the first slave 2 is connected to the output optical fiber, and the output optical fiber passes through the output optical fiber interface of the first slave 2 to be connected to the corresponding fiber bragg grating sensor.
When temperature change or pressure change of points on a long distance needs to be monitored, for example, temperature change or pressure change of a track, as shown in fig. 1, the master machine and the slave machines are arranged in a line array, the output optical fiber passes through the output optical fiber interface of the first slave machine 2 to be sequentially connected with the second slave machine 3, and the second slave machine 3 is continuously connected with the second slave machine 3 in series until the point extends to the position to be measured of the track.
When circumferential temperature change or pressure change of a certain device needs to be measured, as shown in fig. 2, the master machines and the slave machines are arranged in an annular array, the output optical fibers penetrate through the output optical fiber interfaces of the first slave machines 2 and are simultaneously connected with a plurality of second slave machines 3, and the second slave machines 3 are arranged in parallel and circumferentially arranged around the device to be measured.
When it is necessary to monitor circumferential temperature change or pressure change of a point over a long distance, for example, circumferential temperature change or pressure change of each point on a track, as shown in fig. 3, the master and the slave are arranged in a binary tree shape, and the output optical fiber passes through the output optical fiber interface of the first slave 2 to sequentially connect in series a plurality of second slaves 3 connected in parallel until extending to a position to be measured on the track.
The slave machines are connected with the fiber grating sensor, and the host machine 1 sends laser signals to the fiber grating sensor through optical fibers. The host 1 transmits a plurality of laser beams with predetermined wavelengths, each fiber grating sensor reflects the laser beams with specific wavelengths without changing the wavelength when the temperature or the pressure does not change, and the wavelength reflected by the fiber grating sensor shifts or disappears when the external environment, such as the temperature or the pressure, changes. The host 1 observes whether the external environment of each location changes or not through the change of the wavelength.
In one embodiment, the host 1 may be powered by an external power source or an onboard power source.
In one embodiment, when the output fiber is connected to the second slave 3 through the output fiber interface of the first slave 2, the output fiber is a single multicore fiber to connect multiple slaves; when the output optical fiber penetrates through an output optical fiber interface of the first slave machine 2 to be connected with the fiber bragg grating sensor, the output optical fiber is a single-core optical fiber to be connected with the fiber bragg grating sensor.
The input optical fiber is a single multi-core optical fiber.
The number of the single multi-core optical fiber is 12-144 cores.
In an embodiment, the slave further includes an output optical fiber interface adapter (not shown in the figure) and an output optical fiber interface card seat (not shown in the figure), the output optical fiber is fixed on the output optical fiber interface card seat through the output optical fiber interface adapter, the output optical fiber interface card seat is detachably disposed inside the slave, and after the adapting interface is completed, the output optical fiber interface card seat can be fixed inside the slave again, so that the slave can be flexibly disassembled and assembled according to practical needs.
In one embodiment, a buckle (not shown in the figure) is arranged outside the output optical fiber interface, and the output optical fiber is fixed outside the slave machine through the buckle, so that the interface adapter is prevented from being influenced by external tension.
The host 1 includes:
a laser control circuit for controlling the generation of laser light;
a transmission interface for outputting laser light into the optical splitter;
the data processing and device control chip is used for controlling the operation of the whole demodulation system;
a data storage unit for storing device parameters; the data storage unit can realize the data storage requirement of 5 to 10 years of system important parameter data, and the data of the local data storage unit can be read through the RJ45 network communication interface.
The optical circulator is used for receiving the laser passing through the input optical fiber and transmitting the laser to the fiber grating sensor, and then receiving an optical signal fed back by the fiber grating sensor according to the laser;
and the optical fiber plug-in component is used for installing and fixing the input optical fiber.
As shown in fig. 4, the host 1 includes an upper computer 11 and a main control module 12, and the main control module 12 includes: laser instrument control circuit, transmission interface, data processing and device control chip, data memory cell, optical circulator and optic fibre grafting subassembly, main control module 12 communicates with host computer 11 through RJ45 network communication interface.
The fiber grating sensor at least comprises a temperature fiber grating sensor, an acceleration fiber grating sensor, a displacement fiber grating sensor, a pressure fiber grating sensor and a flow fiber grating sensor.
The host 1 demodulates the optical signal fed back by the fiber grating sensor and obtains the wavelength signal of the fed back optical signal.
Specifically, when the fiber grating sensors are temperature sensors, each fiber grating sensor receives laser from the optical circulator and returns laser with a specific wavelength, when the ambient temperature of the fiber grating sensors changes, the wavelength of the reflected laser changes, and the change of the temperature can be obtained by measuring the change of the wavelength before and after the temperature changes.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The fiber grating demodulation system is characterized by comprising a host, an optical splitter and a plurality of slaves, wherein the host is connected with the optical splitter, the optical splitter is connected with the slaves through input optical fibers, and the slaves are distributed in an array.
2. The fiber grating demodulation system of claim 1 wherein the slave device comprises an optical port adapter, an input fiber interface and an output fiber interface, the optical port switching device comprises an input unit and an output unit, the input optical fiber interface and the output optical fiber interface are both fixed on a panel of the slave, the slave machines comprise a first slave machine and a second slave machine, the input optical fiber is connected with the input unit of the first slave machine through the input optical fiber interface of the first slave machine, the output unit of the first slave is connected with an output optical fiber, the output optical fiber passes through an output optical fiber interface of the first slave to be connected with a corresponding fiber grating sensor, or the output optical fiber penetrates through an output optical fiber interface of the first slave machine to be sequentially connected with at least one second slave machine, and the first slave machine and the second slave machine are respectively connected with corresponding fiber grating sensors.
3. The fiber grating demodulation system of claim 2 wherein when the output fiber is connected to the second slave through the output fiber interface of the first slave, the output fiber is a single multi-core fiber; when the output optical fiber penetrates through an output optical fiber interface of the first slave machine to be connected with the fiber bragg grating sensor, the output optical fiber is a single-core optical fiber.
4. The fiber grating demodulation system of claim 3 wherein the input fiber is a single multicore fiber.
5. The fiber grating demodulation system of claim 4 wherein the number of cores of the single multi-core fiber is 12 to 144 cores.
6. The fiber grating demodulation system of claim 5, wherein the slave further comprises an output fiber interface adapter and an output fiber interface card seat, the output fiber is fixed on the output fiber interface card seat through the output fiber interface adapter, and the output fiber interface card seat is detachably disposed inside the slave.
7. The fiber grating demodulation system of claim 6 wherein a buckle is disposed outside the output fiber interface, and the output fiber is fixed outside the slave machine by the buckle.
8. The fiber grating demodulation system of claim 7 wherein said host comprises:
a laser control circuit for controlling the generation of laser light;
a transmission interface for outputting laser light into the optical splitter;
the data processing and device control chip is used for controlling the operation of the whole demodulation system;
a data storage unit for storing device parameters;
the optical circulator is used for receiving the laser passing through the input optical fiber and transmitting the laser to the fiber grating sensor, and then receiving an optical signal fed back by the fiber grating sensor according to the laser;
and the optical fiber plug-in component is used for installing and fixing the input optical fiber.
9. The fiber grating demodulation system of claim 8 wherein the fiber grating sensors comprise at least a temperature fiber grating sensor, an acceleration fiber grating sensor, a displacement fiber grating sensor, a pressure fiber grating sensor, and a flow fiber grating sensor.
10. The fiber grating demodulation system of claim 9, wherein the host is configured to demodulate the optical signal fed back by the fiber grating sensor and obtain a wavelength signal of the fed back optical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220898.4U CN211205341U (en) | 2019-12-09 | 2019-12-09 | Fiber grating demodulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220898.4U CN211205341U (en) | 2019-12-09 | 2019-12-09 | Fiber grating demodulation system |
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| CN211205341U true CN211205341U (en) | 2020-08-07 |
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| CN201922220898.4U Active CN211205341U (en) | 2019-12-09 | 2019-12-09 | Fiber grating demodulation system |
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