CN113315570A - Distributed measurement method and system based on time division multiplexing and wavelength division multiplexing - Google Patents
Distributed measurement method and system based on time division multiplexing and wavelength division multiplexing Download PDFInfo
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- CN113315570A CN113315570A CN202110584974.9A CN202110584974A CN113315570A CN 113315570 A CN113315570 A CN 113315570A CN 202110584974 A CN202110584974 A CN 202110584974A CN 113315570 A CN113315570 A CN 113315570A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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Abstract
The application relates to a distributed measurement and method based on time division multiplexing and wavelength division multiplexing. This application uses two optic fibre as the trunk, and the transmitting terminal sends light and passes through light sensing device in proper order, and light sensing device arrives the receiving terminal at feedback light from another light, only needs a light source to come the distributed measurement that light just realized a plurality of light sensing device, has reduced the cost of light source part. The whole system has low complexity, small occupied space and easy implementation.
Description
Technical Field
The application belongs to the technical field of optical communication and sensor detection, and particularly relates to a distributed measurement method and system based on time division multiplexing and wavelength division multiplexing.
Background
Optical fibers have advantages in connection distance, expansion capability, and performance over cables, and thus optical communication is a direction of future development instead of cable communication. The distributed optical sensing system using optical communication as a backbone also becomes a new hotspot due to the adaptability of optical communication and the capability of resisting electromagnetic interference.
The multiplexing architecture currently in common use in the field is a wavelength division multiplexing architecture. Wavelength Division multiplexing (wdm) combines a series of optical carrier signals with different wavelengths together by a Multiplexer (Multiplexer) at a transmitting end and couples the signals into the same optical fiber for transmission, and separates optical signals with various wavelengths at a receiving end by a Demultiplexer (Demultiplexer), and light with each wavelength is connected with a sensor by an optical fiber, thereby realizing distributed monitoring. However, this multiplexing method requires a plurality of light sources with different wavelengths and a plurality of optical fibers connected in parallel, which greatly increases the complexity of the system and also increases the cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the above-mentioned deficiencies in the prior art, a distributed measurement system and method based on time division multiplexing and wavelength division multiplexing are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a distributed measurement system based on time division multiplexing and wavelength division multiplexing, comprising:
the transmitting end is used for transmitting pulse light;
the optical sensing devices are connected in series in the same optical path through a first optical fiber;
the receiving end is used for receiving the light rays fed back by the light sensing device;
after the transmitting end transmits the pulse light source, the pulse light source sequentially passes through all the optical sensing devices through the first optical fiber, and the optical sensing devices receive the pulse light source and then feed back optical signals to the receiving end through the second optical fiber according to the receiving sequence;
and the transmitting end corresponds to the optical sensing device which feeds back the optical signals according to the sequence of the received optical signals after receiving the optical signals.
Preferably, the distributed measurement system based on time division multiplexing and wavelength division multiplexing of the present invention,
each optical sensing device is positioned in a node, and each node comprises a Bragg grating connected with a first optical fiber and a coupler connected with a second optical fiber;
and two ends of the optical sensing device are respectively connected with the Bragg grating and the coupler.
Preferably, in the time division multiplexing and wavelength division multiplexing-based distributed measurement system of the present invention, the optical power of one path of the received light beam that is split by the bragg grating and enters the optical sensing device is one N times of the optical power of the light beam emitted by the emitting end, where N is the number of the optical sensing devices.
Preferably, in the distributed measurement system based on time division multiplexing and wavelength division multiplexing of the present invention, the receiving end includes a photodiode, a demodulator, and a digital-to-analog converter, and is responsible for converting the received optical signal into a digital signal;
the optical sensing devices are a temperature optical sensor, a pressure optical sensor, a strain optical sensor, an acceleration optical sensor and a vibration optical sensor.
Preferably, in the time division multiplexing and wavelength division multiplexing based distributed measurement system of the present invention, the receiving end is further capable of determining which optical sensor device has a component damage at the position according to the received light.
The invention also provides a distributed measurement method based on time division multiplexing and wavelength division multiplexing, which comprises the following steps:
s1: the emitting end emits pulse light;
s2: the light enters a light path formed by the first optical fiber, and a plurality of light sensing devices are connected in series in the light path;
s3: after receiving the pulse light source, the optical sensing device feeds back optical signals to a receiving end through a second optical fiber according to a receiving sequence;
s4: and the receiving end receives the optical signals and then corresponds to the optical sensing device which feeds back the optical signals according to the sequence of the received optical signals.
Preferably, in the distributed measurement method based on time division multiplexing and wavelength division multiplexing of the present invention, each of the optical sensing devices is located in a node, and each node includes a bragg grating connected to a first optical fiber and a coupler connected to a second optical fiber;
and two ends of the optical sensing device are respectively connected with the Bragg grating and the coupler.
Preferably, in the distributed measurement method based on time division multiplexing and wavelength division multiplexing of the present invention, the optical power of one path of the received light beam that is split by the bragg grating and enters the optical sensing device is one N times of the optical power of the light beam emitted by the emitting end, where N is the number of the optical sensing devices.
Preferably, in the distributed measurement method based on time division multiplexing and wavelength division multiplexing of the present invention, if the receiving end does not receive the light fed back by a certain optical sensor, it indicates that the optical sensor is damaged.
Preferably, in the distributed measurement method based on time division multiplexing and wavelength division multiplexing of the present invention, when the transmitting end emits the pulsed light in step S1, time is recorded, and time required for each optical sensor device to feed back the light to reach the receiving end is preset;
and if the quantity M of the light rays received by the receiving end is smaller than the total quantity N of the optical sensing devices, determining the source of the feedback light rays according to the time of the feedback light rays reaching the receiving end.
The invention has the beneficial effects that:
this application uses two optic fibre as the trunk, and the transmitting terminal sends light and passes through light sensing device in proper order, and light sensing device arrives the receiving terminal at feedback light from another light, only needs a light source to come the distributed measurement that light just realized a plurality of light sensing device, has reduced the cost of light source part. The whole system has low complexity, small occupied space and easy implementation.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
Fig. 1 is a schematic structural diagram of a distributed measurement system based on time division multiplexing and wavelength division multiplexing according to an embodiment of the present application;
fig. 2 is a flowchart of a distributed measurement method based on time division multiplexing and wavelength division multiplexing according to an embodiment of the present application.
The reference numbers in the figures are:
1, a transmitting terminal;
2, a light sensing device;
3, receiving end;
5 Bragg grating;
6 coupler.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The embodiment provides a distributed measurement system based on time division multiplexing and wavelength division multiplexing, as shown in fig. 1, including:
the transmitting terminal 1 is used for transmitting pulse light;
the optical sensing devices 2 are connected in series in the same optical path through first optical fibers;
the receiving end 3 is used for receiving the light fed back by the light sensing device 2;
after the transmitting end 1 transmits the pulse light source, the pulse light source sequentially passes through all the optical sensing devices 2, and after the optical sensing devices 2 receive the pulse light source, optical signals are fed back to the receiving end 3 according to the receiving sequence; the receiving end 3 receives the optical signals and then corresponds to the optical sensor device 2 which feeds back the optical signals according to the sequence of the received optical signals.
Such as: the first received optical signal is from the first photo-sensing device 2 in the optical path, the second received optical signal is from the second photo-sensing device 2 … … in the optical path, and so on, and the last received optical signal is from the last photo-sensing device 2 in the optical path.
Preferably, the transmitting end 1 and the receiving end 3 are respectively connected with a first optical fiber and a second optical fiber, each optical sensing device 2 is located in a node, and each node comprises a bragg grating 5 connected with the first optical fiber and a coupler 6 connected with the second optical fiber;
the two ends of the optical sensing device 2 are respectively connected with the bragg grating 5 and the coupler 6.
The bragg grating 5 divides the received light into one path of light entering the optical sensing device 2, and the optical power of the one path of light entering the optical sensing device 2 is one N times of the optical power of the light emitted by the emitting end 1, wherein N is the number of the optical sensing devices 2.
Preferably, the receiving end 3 includes, but is not limited to, a photodiode, a demodulator, and a digital-to-analog converter, and is responsible for converting the received optical signal into a digital signal.
Preferably, the light sensing device 2 is a temperature light sensor, a pressure light sensor, a strain light sensor, an acceleration light sensor, or a vibration light sensor.
Preferably, the receiving end 3 is also capable of determining which photo-sensor device 2 has a component damaged at its position according to the amount of received light. For example, if the light fed back by the optical sensor device 2 of the node III is not received, or 2 feedback lights are received, it indicates that a component at the optical sensor device 2 of the node III has a fault.
This application uses two optic fibre as the trunk, and the transmitting terminal sends light and passes through light sensing device in proper order, and light sensing device arrives the receiving terminal at feedback light from another light, only needs a light source to come the distributed measurement that light just realized a plurality of light sensing device, has reduced the cost of light source part. The whole system has low complexity, small occupied space and easy implementation.
Example 2
The embodiment provides a distributed measurement method based on time division multiplexing and wavelength division multiplexing, as shown in fig. 2, including the following steps:
s1: the transmitting end 1 transmits pulse light;
s2: the light enters a light path formed by the optical fiber, and a plurality of light sensing devices 2 are connected in series in the light path;
s3: the optical sensing device 2 feeds back optical signals to the receiving end 3 according to the receiving sequence after receiving the pulse light source;
s4: the receiving end 3 receives the optical signals and then corresponds to the optical sensor device 2 which feeds back the optical signals according to the sequence of the received optical signals.
Taking ten acceleration nodes as an example, 10 nodes are respectively node I and node II … … node X:
the time division multiplexing system comprises ten optical fiber access mems type accelerometer nodes, wherein a transmitting end and a receiving end are respectively connected with two optical fibers, the lengths of the optical fibers from the transmitting end/the receiving end to a node 1 and between each adjacent nodes are the same, and the optical power of the optical fibers entering the mems type accelerometer after the optical fibers are split by a Bragg grating 5 of each node is the same. The working process comprises the following steps: firstly, a transmitting end sends out a beam of high-power pulse laser at 0 moment, when the pulse reaches a Bragg grating 5 in a node I along a main optical fiber, the pulse is divided into two beams according to the optical power 1:9 during transmission, 10% of the pulse enters a mems type accelerometer, and 90% of the pulse goes to a node II. After passing through the mems accelerometer, the first beam of light carries acceleration information back to the trunk optical fiber and is transmitted to the receiving end along the trunk optical fiber, and the receiving end 3 receives the pulse at time t. Assuming that the length of the optical fiber from the transmitting/receiving end to the node I and the length of the optical fiber between each adjacent node are the same, the distance traveled by the pulse returned by the node II is twice as long as that of the node I, and according to the formula t/c, t2 is 2s/c and 2 t. I.e. the receiver 3 receives the pulse from node II at time 2 t. By analogy, the receiver receives the pulse from node X at time 10 t. The interval time T of the pulse laser emitted by the pulse light source is more than 10T, and in each pulse emission period T, the receiving end 3 judges which node the pulse originates from according to the time sequence of the received pulse, so that distributed detection is finished.
Preferably, the receiving end 3 can also determine which photo-sensing device 2 is damaged according to the number of received light rays, for example, light rays fed back by the photo-sensing device 2 of the node III are not received, or 2 feedback light rays are received, which indicates that the photo-sensing device 2 of the node III is in a fault.
When the transmitting terminal 1 transmits the pulse light in the step of S1, recording the next time, and presetting the time required for each optical sensor 2 to feed back the light to reach the receiving terminal 3;
if the number M of the light received by the receiving end 3 is smaller than the total number N of the optical sensing devices 2, the source of the feedback light is determined according to the time of the feedback light reaching the receiving end 3.
That is, when M is smaller than N, for example, only 9 feedback light rays are received, the light sensing device 2 of which node the 9 feedback light rays respectively come from is determined according to the time for receiving the feedback light rays.
By setting various error feedback mechanisms, the monitoring of the damaged nodes is realized, and data errors can be prevented.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A distributed measurement system based on time division multiplexing and wavelength division multiplexing, comprising:
the transmitting end (1) is used for transmitting pulse light;
the optical sensing devices (2) are connected in series in the same optical path through first optical fibers;
the receiving end (3) is used for receiving the light fed back by the light sensing device (2);
after the transmitting end (1) transmits the pulse light source, the pulse light source sequentially passes through all the optical sensing devices (2) through the first optical fibers, and after the optical sensing devices (2) receive the pulse light source, optical signals are fed back to the receiving end (3) through the second optical fibers in a receiving sequence;
and the transmitting terminal (1) corresponds to the optical sensing device (2) which feeds back the optical signals according to the sequence of the received optical signals after receiving the optical signals.
2. The time division multiplexing and wavelength division multiplexing based distributed measurement system of claim 1,
each light sensing device (2) is located in a node, and each node comprises a Bragg grating (5) connected with a first optical fiber and a coupler (6) connected with a second optical fiber;
and two ends of the optical sensing device (2) are respectively connected with the Bragg grating (5) and the coupler (6).
3. The time division multiplexing and wavelength division multiplexing based distributed measurement system according to claim 2, wherein the optical power of the bragg grating (5) for splitting the received light into one path entering the light sensing devices (2) is one nth of the optical power of the light emitted from the emitting end (1), where N is the number of the light sensing devices (2).
4. The time division multiplexing and wavelength division multiplexing based distributed measurement system of claim 1, wherein the receiving end (3) comprises a photodiode, a demodulator, a digital-to-analog converter, responsible for converting the received optical signal into a digital signal;
the optical sensing device (2) is a temperature optical sensor, a pressure optical sensor, a strain optical sensor, an acceleration optical sensor and a vibration optical sensor.
5. The time-division multiplexing and wavelength-division multiplexing based distributed measurement system according to claim 2, wherein the receiving end (3) is further capable of determining which photo-sensing device (2) has a component damage at its location based on the received light.
6. A distributed measurement method based on time division multiplexing and wavelength division multiplexing is characterized by comprising the following steps:
s1: the transmitting end (1) transmits pulse light;
s2: light enters a light path formed by the first optical fiber, and a plurality of light sensing devices (2) are connected in series in the light path;
s3: after receiving the pulse light source, the optical sensing device (2) feeds back optical signals to the receiving end (3) through a second optical fiber according to a receiving sequence;
s4: and the receiving end (3) corresponds to the optical sensing device (2) which feeds back the optical signals according to the sequence of the received optical signals after receiving the optical signals.
7. The time division multiplexing and wavelength division multiplexing based distributed measurement method according to claim 6, wherein each of the optical sensing devices (2) is located in a node, each node comprising a bragg grating (5) connected to a first optical fiber and a coupler (6) connected to a second optical fiber;
and two ends of the optical sensing device (2) are respectively connected with the Bragg grating (5) and the coupler (6).
8. The distributed measurement method based on time division multiplexing and wavelength division multiplexing of claim 7, wherein the optical power of the Bragg grating (5) for splitting the received light into one path entering the light sensing devices (2) is one N times of the optical power of the light emitted from the emitting end (1), wherein N is the number of the light sensing devices (2).
9. The distributed measurement method based on time division multiplexing and wavelength division multiplexing of claim 6, wherein if the receiving end (3) does not receive the light fed back by a certain light sensing device (2), it indicates that the light sensing device (2) is damaged.
10. The distributed measurement method based on time division multiplexing and wavelength division multiplexing according to claim 6, wherein when the transmitting end (1) transmits the pulsed light in step S1, the time is recorded, and the time required for each optical sensing device (2) to feed back the light to reach the receiving end (3) is preset;
and if the number M of the light rays received by the receiving end (3) is smaller than the total number N of the optical sensing devices (2), determining the source of the feedback light rays according to the time of the feedback light rays reaching the receiving end (3).
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| CN101267254A (en) * | 2008-04-01 | 2008-09-17 | 山东大学 | Two-line optical sensing network and its method based on spectrum division multiplexing method |
| CN102175268A (en) * | 2011-01-29 | 2011-09-07 | 西南交通大学 | Quasi-distributed sensor network based on time division multiplex and matched optical fiber grating technology |
| CN102183267A (en) * | 2011-03-11 | 2011-09-14 | 江苏联通电缆有限公司 | Fiber Bragg grating sensing system |
| CN106768468A (en) * | 2016-11-14 | 2017-05-31 | 电子科技大学 | A kind of wavelength-division multiplex quasi-distributed optical fiber delay temperature sensor |
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2021
- 2021-05-27 CN CN202110584974.9A patent/CN113315570A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267254A (en) * | 2008-04-01 | 2008-09-17 | 山东大学 | Two-line optical sensing network and its method based on spectrum division multiplexing method |
| CN102175268A (en) * | 2011-01-29 | 2011-09-07 | 西南交通大学 | Quasi-distributed sensor network based on time division multiplex and matched optical fiber grating technology |
| CN102183267A (en) * | 2011-03-11 | 2011-09-14 | 江苏联通电缆有限公司 | Fiber Bragg grating sensing system |
| CN106768468A (en) * | 2016-11-14 | 2017-05-31 | 电子科技大学 | A kind of wavelength-division multiplex quasi-distributed optical fiber delay temperature sensor |
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Application publication date: 20210827 |