CN111555807A - Multi-path switching value parallel transmission system and method based on optical fibers - Google Patents
Multi-path switching value parallel transmission system and method based on optical fibers Download PDFInfo
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- CN111555807A CN111555807A CN202010390118.5A CN202010390118A CN111555807A CN 111555807 A CN111555807 A CN 111555807A CN 202010390118 A CN202010390118 A CN 202010390118A CN 111555807 A CN111555807 A CN 111555807A
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
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Abstract
The invention discloses a multi-path switching value parallel transmission system and a method based on optical fibers, wherein the transmission system comprises a sending unit, a distribution unit and M receiving units; the transmitting unit comprises n optical transmitters, each optical transmitter corresponds to a signal source, and the n optical transmitters transmit laser signals with different frequencies emitted by the signal sources through respective connected optical fibers to be coupled in an optical fiber coupler; the optical fiber coupler in the sending unit is in communication connection with the optical fiber coupler in the distribution unit through optical fibers, the distribution unit distributes laser signals to different receiving units through the optical fiber coupler, and each receiving unit comprises the laser signals sent by each signal source; the receiving unit comprises an optical wavelength division multiplexer, and the optical wavelength division multiplexer is in communication connection with the n photoelectric switches through n optical fibers. The invention solves the problems of relay failure, signal transmission interference and incapability of self-checking caused by the fact that the switching value is controlled by the existing relay.
Description
Technical Field
The invention relates to the technical field of automatic electrical control, in particular to a multi-path switching value parallel transmission system and method based on optical fibers.
Background
The switching value is widely applied to the field of industrial control and protection, such as starting and stopping of a pump, switching driving of a valve, temperature and water level and the like, and is driven or alarmed by a switching value signal. In a nuclear power device, the emergency shutdown of a reactor also depends on a protection device to send a switching value signal to a shutdown circuit breaker to trigger the emergency shutdown, so that the safety of the reactor is guaranteed.
In conventional designs, the switching value typically characterizes a "0" or a "1" of a signal by making or breaking a circuit by opening or closing a relay (mechanical or solid state relay based on semiconductor technology). Although the traditional design based on the similar relay is simple in structure and convenient to use, the following problems exist:
1. fatigue exists in the motion of the mechanical arm of the relay, and the contact is adhered, so that the relay cannot be opened;
2. the semiconductor relay has the condition of breakdown damage;
3. because the electric loop only has a closed state and an open state, when the electric loop is in the open state, the system can not judge whether the fault caused by the open circuit or the real signal exists, and the self-checking capability is limited;
4. when the same signal is sent to a plurality of terminals, mutual electric influence exists, and when the multi-path driving is carried out, electric isolation is needed to be carried out at the front end, so that the size is large, and the structure is complex;
5. one line can only transmit a single signal and cannot be multiplexed in parallel;
6. because the mechanical relay shakes during opening or closing, the shake needs to be eliminated through time delay, and the response time can be prolonged;
7. the action of the mechanical arm has time delay;
8. the cable is thick.
Since the communication technology based on the laser and the optical fiber is widely applied to the industrial control and communication fields, and the laser and the optical fiber communication have the technical advantages of fast response, electric isolation, electromagnetic interference resistance, small volume and the like, the analog signal transmission based on the optical fiber has a good effect.
Laser and optical fiber communication have been widely used as communication means, but no application precedent is found in the aspect of switching value signal transmission of industrial control.
Disclosure of Invention
The invention aims to provide a multi-path switching value parallel transmission system based on optical fibers, which solves the problems of relay faults, signal transmission interference and incapability of self-checking caused by the fact that the switching value is controlled through a relay in the prior art.
In addition, the invention also provides a transmission method of the multi-path switching value parallel transmission system
The invention is realized by the following technical scheme:
a multi-path switching value parallel transmission system based on optical fibers comprises a sending unit, a distribution unit and M receiving units, wherein M is an integer greater than or equal to 1;
the transmitting unit comprises n optical transmitters, each optical transmitter corresponds to a signal source, and the n optical transmitters transmit laser signals with different frequencies emitted by the signal sources through respective connected optical fibers to be coupled in an optical fiber coupler;
the distribution unit comprises an optical fiber coupler, the optical fiber coupler in the sending unit is in communication connection with the optical fiber coupler in the distribution unit through an optical fiber, the distribution unit distributes laser signals to different receiving units through the optical fiber coupler, and each receiving unit comprises the laser signals sent by each signal source;
the receiving unit comprises an optical wavelength division multiplexer, the optical wavelength division multiplexer is in communication connection with n photoelectric switches through n optical fibers, the photoelectric switches are provided with a detection circuit in a matching mode, and n is an integer greater than or equal to 1.
The following requirements in the switching value signal transmission in industrial control are realized:
1) the signal sending and receiving ends are well electrically isolated; 2) the signal transmission time delay is as small as possible; 3) eliminating the influence of signal jitter as much as possible; 4) false action and refusal action (accidental opening or closing, contact adhesion) are eliminated as much as possible; 5) one signal can be sent to different terminals, and the mutual influence is as low as possible; 6) the transmission path electromagnetic emission is as low as possible; 7) the transmission path is subjected to external electromagnetic interference as low as possible; 8) the transmission path is influenced by the environment such as temperature, humidity and irradiation as little as possible; 9) the requirement on insulation is as low as possible; 10) the harm caused by short circuit is reduced as much as possible in the transmission process; 11) the problems of the transmission line can be self-checked; 12) the service life is as long as possible; 13) the transmission channels are as small as possible and are multiplexed as possible.
In the transmission system, the signal for driving the signal switching value is set as the laser signal, so that the problems of relay faults, signal transmission interference and incapability of self-checking caused by the traditional relay control switching value are solved. The self-checking process of the invention comprises the following steps:
a certain frequency channel may be used for diagnosing the transmission line. For example, the λ i channel is opened periodically, so that the detection of the connectivity of the transmission line can be realized, and no interference is generated to other signal transmission. Thereby realizing on-line diagnosis.
The transmission system can be used for transmitting the signal of the switching value sensor to the control or protection cabinet;
the invention can be used for controlling or protecting equipment such as a cabinet driving pump, a valve and the like, realizes good electrical isolation, particularly realizes multi-signal and multi-terminal 'many-to-many' transmission in a single channel, and is completely electrically isolated and logically isolated from each other without mutual interference.
The invention can be used for the long-distance transmission of switching value signals, the signal attenuation is reduced in the transmission process, and the influence of electromagnetic interference and insulation reduction is avoided.
The invention can realize the transmission of a plurality of states by using one optical cable, and breaks through the traditional limitation of only '0' and '1'.
The invention eliminates the problems of mechanical jitter, contact adhesion, incapability of self-checking the circuit and the like, and obviously improves the reliability and self-diagnosis capability of the system.
The receiving end of the invention does not need a complex detection circuit and a microprocessor, and the circuit is simple; a large number of passive optical devices are applied in the line, and the independence is good.
The invention uses optical fiber to transmit signal, so the volume of signal transmission line is reduced obviously, the cost is reduced obviously, and the reliability is improved obviously.
In summary, in order to solve the above technical problems, the present invention provides a switching value signal transmission system based on laser and optical fiber, in the transmission system of the present invention, a signal for driving the switching value of a signal is set as a laser signal and is sent to a switch cabinet corresponding to a pump or a valve of a dedicated system, and the switch cabinet determines whether to drive the corresponding pump or valve according to different laser frequencies. The invention realizes good electrical isolation between the electrical system and the instrument control system, and the transmission path can omit the periodic test of response due to real-time self-inspection, thereby obviously improving the reliability and maintainability of the system.
Further, the signal source is a switch or a driving signal.
Further, the switch is a temperature switch, a liquid level switch or a valve position switch.
Other switches are also possible as well as other switches,
further, the driving signal is a pump opening signal, a valve opening signal or an alarm signal.
Other signals are also possible.
A transmission method of a multi-path switching value parallel transmission system based on optical fibers comprises the following steps:
1) laser modulation and emission: according to the state of '0' or '1' of the signal source, the optical transmitter sends out a laser signal with corresponding frequency;
2) optical signal coupling: the n optical transmitters respectively enter the optical fiber couplers of the sending unit according to laser signals sent by corresponding input signal states and through respective connected optical fibers, and the optical fiber couplers of the sending unit couple the laser signals with different frequencies from the optical transmitters to the same optical fiber for remote transmission to the optical fiber couplers of the distribution unit;
3) signal distribution: when the laser signal needs to be transmitted to different signal terminals, the laser signal is distributed to different receiving units through the optical fiber coupler of the distribution unit;
4) receiving and demodulating a laser signal: the laser signals enter the optical wavelength division multiplexers of the receiving units, the optical wavelength division multiplexers respectively send the laser signals with different frequencies from the input optical fibers to the corresponding ports according to the frequencies, the detected monochromatic light signals are output from the corresponding ports of the optical wavelength division multiplexers and then are connected with the photoelectric switches through a single section of optical fiber, and the detection circuit detects whether the laser signals exist at the positions of the optical switches, so that the switching value is obtained.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. in the transmission system, the signal for driving the signal switching value is set as the laser signal and is sent to the switch cabinet corresponding to the pump or the valve of the special system, and the switch cabinet judges whether to drive the corresponding pump or valve according to different laser frequencies, so that the problems of relay failure and signal transmission interference caused by the traditional relay control switching value are solved.
2. The invention is the simultaneous transmission of multi-path switching values, not only has high efficiency and complementary interference, but also can realize self-checking.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of signal transmission according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example (b):
as shown in fig. 1, a multi-way switching value parallel transmission system based on optical fiber includes a transmitting unit, a distributing unit and M receiving units, where M is an integer greater than or equal to 1;
the transmitting unit comprises n optical transmitters, each optical transmitter corresponds to a signal source, the n optical transmitters transmit laser signals with different frequencies sent by the signal sources through respective connected optical fibers to be coupled in an optical fiber coupler, the signal sources are switches or driving signals, the switches are temperature switches, liquid level switches or valve position switches and the like, and the driving signals are pump starting signals, valve opening signals or alarm signals and the like;
the distribution unit comprises an optical fiber coupler, the optical fiber coupler in the sending unit is in communication connection with the optical fiber coupler in the distribution unit through an optical fiber, the distribution unit distributes laser signals to different receiving units through the optical fiber coupler, and each receiving unit comprises the laser signals sent by each signal source;
the receiving unit comprises an optical wavelength division multiplexer, the optical wavelength division multiplexer is in communication connection with n photoelectric switches through n optical fibers, the photoelectric switches are provided with a detection circuit in a matching mode, and n is an integer greater than or equal to 1.
A transmission method of the optical fiber-based multi-way switching value parallel transmission system according to embodiment 1, comprising the steps of:
1) laser modulation and emission: in fig. 1, I1-In are signal sources, which may be various switches, such as a temperature switch, a liquid level switch, and a valve position switch, or driving signals, such as a pump-starting signal, a valve-opening signal, and an alarm signal. The signal source gives a state of "0" or "1", and the optical transmitter emits laser light of a corresponding wavelength according to the state of "0" or "1" of the signal source. Generally, 1 is luminescent and 0 is non-luminescent;
in the sending unit, a multiplex optical transmitter may be integrated, which transmits laser wavelengths λ 1, λ 2 … … λ n, respectively; I1-In, corresponding to n beams of optical signals with different frequencies (colors), work independently without mutual interference.
2) Optical signal coupling: the n optical transmitters respectively enter the optical fiber couplers of the sending unit according to laser signals sent by corresponding input signal states and through respective connected optical fibers, and the optical fiber couplers of the sending unit couple the laser signals with different frequencies from the optical transmitters to the same optical fiber for remote transmission to the optical fiber couplers of the distribution unit;
3) signal distribution: when the laser signal needs to be transmitted to different signal terminals, the laser signal is distributed to different receiving units through the optical fiber coupler of the distribution unit, as shown in fig. 1, to the receiving units corresponding to the channel No. 1, the channel No. 2 … …, and the channel No. M;
each signal channel obtains laser signals containing all wavelengths, signal distribution can be cascaded to obtain more distribution terminals, and the distributed light intensity of each path needs to meet the driving requirements of a terminal photoelectric switch; if more terminals are needed, the relay station can be used for optical power enhancement;
4) receiving and demodulating a laser signal: optical wavelength division multiplexer(s) for the laser signal to enter each receiving unitWDM) The optical wavelength division multiplexer respectively sends laser signals with different frequencies (wavelengths) from the input optical fiber to corresponding ports according to the frequencies, detected monochromatic light signals are output from the corresponding ports of the optical wavelength division multiplexer and then are connected with the photoelectric switch through a single section of optical fiber, and the detection circuit detects whether the laser signals exist at the position of the photoelectric switch or not, so that the switching value is obtained.
Fault diagnosis:
a certain frequency channel may be used for diagnosing the transmission line. For example, the λ i channel is opened periodically, so that the detection of the connectivity of the transmission line can be realized, and no interference is generated to other signal transmission. Thereby realizing on-line diagnosis.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A multi-path switching value parallel transmission system based on optical fibers is characterized by comprising a sending unit, a distribution unit and M receiving units, wherein M is an integer greater than or equal to 1;
the transmitting unit comprises n optical transmitters, each optical transmitter corresponds to a signal source, and the n optical transmitters transmit laser signals with different frequencies emitted by the signal sources through respective connected optical fibers to be coupled in an optical fiber coupler;
the distribution unit comprises an optical fiber coupler, the optical fiber coupler in the sending unit is in communication connection with the optical fiber coupler in the distribution unit through an optical fiber, the distribution unit distributes laser signals to different receiving units through the optical fiber coupler, and each receiving unit comprises the laser signals sent by each signal source;
the receiving unit comprises an optical wavelength division multiplexer, the optical wavelength division multiplexer is in communication connection with n photoelectric switches through n optical fibers, the photoelectric switches are provided with a detection circuit in a matching mode, and n is an integer greater than or equal to 1.
2. The optical fiber-based multi-way switching value parallel transmission system according to claim 1, wherein the signal source is a switch or a driving signal.
3. The optical fiber-based multi-way switching value parallel transmission system according to claim 2, wherein the switch is a temperature switch, a liquid level switch or a valve position switch.
4. The optical fiber-based multi-way switching value parallel transmission system according to claim 2, wherein the driving signal is a pump-on signal, a valve-on signal or an alarm signal.
5. A transmission method of an optical fiber-based multi-switching parallel transmission system according to any one of claims 1 to 4, comprising the steps of:
1) laser modulation and emission: according to the state of '0' or '1' of the signal source, the optical transmitter sends out a laser signal with corresponding frequency;
2) optical signal coupling: the n optical transmitters respectively enter the optical fiber couplers of the sending unit according to laser signals sent by corresponding input signal states and through respective connected optical fibers, and the optical fiber couplers of the sending unit couple the laser signals with different frequencies from the optical transmitters to the same optical fiber for remote transmission to the optical fiber couplers of the distribution unit;
3) signal distribution: when the laser signal needs to be transmitted to different signal terminals, the laser signal is distributed to different receiving units through the optical fiber coupler of the distribution unit;
4) receiving and demodulating a laser signal: the laser signals enter the optical wavelength division multiplexers of the receiving units, the optical wavelength division multiplexers respectively send the laser signals with different frequencies from the input optical fibers to the corresponding ports according to the frequencies, the detected monochromatic light signals are output from the corresponding ports of the optical wavelength division multiplexers and then are connected with the photoelectric switches through a single section of optical fiber, and the detection circuit detects whether the laser signals exist at the positions of the optical switches, so that the switching value is obtained.
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| CN205958802U (en) * | 2016-08-26 | 2017-02-15 | 南亚电路板（昆山）有限公司 | A smooth subassembly of receiving and dispatching for multichannel parallel transmission |
| CN107104737A (en) * | 2017-03-01 | 2017-08-29 | 西安微电子技术研究所 | A kind of node device port extension system and method based on optical fiber interconnections |
| CN107294612A (en) * | 2017-07-28 | 2017-10-24 | 中航海信光电技术有限公司 | A kind of wavelength-division multiplex optical fiber transceiver module and optical fiber network system |
| US20180292240A1 (en) * | 2015-12-25 | 2018-10-11 | Tianjin University | Distributed optical fiber disturbance positioning system based on the asymmetric dual mach-zehnder interference, and positioning method thereof |
| CN110350972A (en) * | 2019-07-26 | 2019-10-18 | 电子科技大学 | On-off model transmission control system based on optical fiber |
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2020
- 2020-05-08 CN CN202010390118.5A patent/CN111555807A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180292240A1 (en) * | 2015-12-25 | 2018-10-11 | Tianjin University | Distributed optical fiber disturbance positioning system based on the asymmetric dual mach-zehnder interference, and positioning method thereof |
| CN205958802U (en) * | 2016-08-26 | 2017-02-15 | 南亚电路板（昆山）有限公司 | A smooth subassembly of receiving and dispatching for multichannel parallel transmission |
| CN107104737A (en) * | 2017-03-01 | 2017-08-29 | 西安微电子技术研究所 | A kind of node device port extension system and method based on optical fiber interconnections |
| CN107294612A (en) * | 2017-07-28 | 2017-10-24 | 中航海信光电技术有限公司 | A kind of wavelength-division multiplex optical fiber transceiver module and optical fiber network system |
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Application publication date: 20200818 |