CN212411352U - Information transmission system based on distributed sensing - Google Patents
Information transmission system based on distributed sensing Download PDFInfo
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- CN212411352U CN212411352U CN202021481285.2U CN202021481285U CN212411352U CN 212411352 U CN212411352 U CN 212411352U CN 202021481285 U CN202021481285 U CN 202021481285U CN 212411352 U CN212411352 U CN 212411352U
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Abstract
The utility model discloses an information transmission system based on distributed sensing, the system includes: the device comprises a pulse light source, a circulator and a signal generator, wherein the pulse light source is used for generating a physical signal and acting on the outer layer of the communication optical fiber so as to enable the light wave signal to generate strain according to a certain rule; the photoelectric detector is used for receiving the regularly-strained light wave signals returned by the communication optical fiber; and the main control module is used for controlling the output of the pulse light source, controlling the receiving of the photoelectric detector and identifying the light wave signal which is strained according to the rule. The scheme combines the distributed sensing technology with optical fiber communication, the information input end does not need to be accessed into an optical cable and only carries out strain excitation on the outer layer of the optical cable, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.
Description
Technical Field
The utility model relates to an optical fiber communication field, in particular to information transmission system based on distributed sensing.
Background
The existing optical fiber communication system mainly depends on the sending and receiving of bidirectional light waves, depends on a large number of chips for signal transmission, and cannot carry out effective signal transmission under special conditions (such as the situations that wireless signals cannot be used, optical fiber transmission equipment is invaded, long-distance physical media are needed for transmitting information, and the like).
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an information transmission system based on distributed sensing, the information transmission under the adaptable special circumstances.
According to the utility model discloses information transmission system based on distributed sensing of first aspect embodiment includes: the pulse light source is used for outputting a light wave signal; a circulator having a first port, a second port, and a third port; the first port of the circulator is connected with the output end of the pulse light source; the input end of the communication optical fiber is connected with the second port of the circulator; the signal generator is arranged on one side of the communication optical fiber far away from the circulator and used for generating a physical signal and acting on the outer layer of the communication optical fiber so as to enable the light wave signal to be strained according to a certain rule; the input end of the photoelectric detector is connected with the third port of the circulator and is used for receiving the regularly strained light wave signal returned by the communication optical fiber; and the main control module is respectively and electrically connected with the pulse light source and the photoelectric detector and is used for controlling the output of the pulse light source, controlling the receiving of the photoelectric detector and identifying the optical wave signals which are strained according to rules.
According to the utility model discloses information transmission system based on distributed sensing of first embodiment has following beneficial effect at least: the scheme combines the distributed sensing technology with optical fiber communication, the information input end does not need to be accessed into an optical cable and only carries out strain excitation on the outer layer of the optical cable, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.
According to some embodiments of the first aspect of the present invention, the signal generator comprises a fixing plate and a power supply, a control chip and a strain gauge arranged on the fixing plate, wherein the power supply is used for supplying power to the control chip and the strain gauge, the control chip is used for controlling the strain gauge to output a physical signal according to a certain rule, and one side of the communication optical fiber is fixed on the fixing plate and contacts with the strain gauge.
According to some embodiments of the first aspect of the present invention, the strain gauge is an electromagnetic vibrator, a heater or a stress generator.
According to some embodiments of the first aspect of the present invention, the communication fiber has an extended fiber loop on the fixing plate, the fiber minimum length L0 of the extended fiber loop is T c r, where T is the maximum pulse time of the pulsed light source, c is the speed of light, and r is the fiber group refractive index.
According to some embodiments of the first aspect of the present invention, the strain gauge is an electromagnetic vibrator, the switching time difference of the electromagnetic vibrator is a basic signal element, the duration of the basic signal element is T0, the waiting time of two adjacent basic signal elements is n × T0, T0 is greater than (LL/(c × r)). 2, where n is a positive integer, LL sets the length for the optical fiber contacted with the strain gauge, c is the speed of light, and r is the refractive index of the optical fiber group.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of an information transmission system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a signal generator according to an embodiment of the present invention;
FIG. 3 is a waveform of the return pulse in an unstrained state according to an embodiment of the present invention;
fig. 4 is a waveform of the return pulse in a strained state according to an embodiment of the present invention;
fig. 5 is a flowchart of an information transmission method according to an embodiment of the second aspect of the present invention.
Reference numerals:
the device comprises a pulse light source 100, a circulator 200, a communication optical fiber 300, a signal generator 400, a fixing plate 410, a power supply 420, a control chip 430, a strain gauge 440, an extension optical fiber ring 450, a photoelectric detector 500 and a main control module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, an information transmission system based on distributed sensing according to an embodiment of a first aspect of the present disclosure includes: a pulsed light source 100 for outputting a light wave signal; a circulator 200, the circulator 200 having a first port, a second port, and a third port; a first port of the circulator 200 is connected with an output end of the pulse light source 100; a communication fiber 300, wherein the input end of the communication fiber 300 is connected with the second port of the circulator 200; a signal generator 400, disposed on a side of the communication fiber 300 away from the circulator 200, for generating a physical signal and acting on an outer layer of the communication fiber 300 to strain the light wave signal according to a certain rule; the input end of the photodetector 500 is connected with the third port of the circulator 200, and is configured to receive the regularly strained light wave signal returned by the communication optical fiber 300; the main control module 600 is electrically connected to the pulsed light source 100 and the photodetector 500 respectively for controlling the output of the pulsed light source 100, controlling the receiving of the photodetector 500, and identifying the regularly-strained light wave signals.
The circulator 200 is used to implement coupling of light waves, output input light waves to the optical fiber, and output reflected and scattered light waves in the optical fiber to the photodetector, as shown in fig. 3; the signal generator 400 is used for generating a certain regular strain frequency sequence; the optical fiber retro-reflected and scattered signals change when strain occurs, as shown in fig. 4.
The scheme combines the distributed sensing technology with optical fiber communication, the information input end does not need to be accessed into an optical cable and only carries out strain excitation on the outer layer of the optical cable, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.
In some embodiments of the first aspect of the present invention, as shown in fig. 2, the signal generator 400 includes a fixing plate 410, and a power source 420, a control chip 430 and a strain gauge 440 disposed on the fixing plate 410, wherein the power source 420 supplies power to the control chip 430 and the strain gauge 440, the control chip 430 is configured to control the strain gauge 440 to output a physical signal according to a certain rule, and one side of the communication fiber 300 is fixed (e.g., by glue or other fasteners) on the fixing plate 410 and is in contact with the strain gauge 440. The control chip 430 controls the strain gauge 400 to strain according to a certain rule, strains according to a certain time rule, converts the rule into a corresponding long short message number or 0, 1 signal, and finally preferably selects the 0, 1 signal to convert the binary code into a strain signal in combination with the operability and convenience of the system.
In some embodiments of the first aspect of the present invention, the strain gauge 440 is an electromagnetic vibrator, a heater, or a stress generator. However, considering factors such as time control and energy consumption control (for example, the heater is not beneficial to heat dissipation control), and finally considering the use of an electromagnetic control vibrator; the single vibration has certain characteristics of the vibration waveform, but because the single vibration is influenced by factors such as interference, distance and the like, the accuracy rate is risky when an accurate characteristic point needs to be identified, but the scheme only identifies the vibration and continuous vibration time, and the method is easy to realize.
In some embodiments of the first aspect of the present invention, the communication fiber 300 has an extended fiber loop 450 on the fixing plate 410 to reduce the influence of the fiber end on backscattering, and the minimum fiber length L0 of the extended fiber loop 450 is T c r, where T is the maximum pulse time of the pulsed light source 100, c is the speed of light, and r is the refractive index of the fiber group.
In some embodiments of the first aspect of the present invention, the strain gauge 440 is an electromagnetic vibrator, the switching time difference of the electromagnetic vibrator is a basic signal element, the duration of the basic signal element is T0, the waiting time of two adjacent basic signal elements is n × T0, and T0 is greater than (LL/(c × r)). sup.2, so as to ensure that the photodetector 500 can receive the returned lightwave signal, where n is a positive integer, LL is the set length of the optical fiber in contact with the strain gauge 440, c is the speed of light, and r is the refractive index of the optical fiber group.
After each basic signal element is sent, the main control module 600 senses a strain point and strain starting and stopping time; when the signal generator 400 sends the strain signal according to a certain time rule, the main control module 600 can also sense the time rule, and a binary sequence code can be formed by taking a basic signal element as 1 and taking an interval of T0 as 0, so as to realize the regular transmission of the signal.
As shown in fig. 5, an information transmission method based on distributed sensing according to an embodiment of the second aspect of the present invention includes the following steps: controlling a pulse light source to send pulse light waves, wherein the pulse light waves enter a communication optical fiber through a circulator; generating a physical signal and acting on the outer layer of the communication optical fiber at a specific position so as to enable the pulse light wave to generate strain according to a certain rule; receiving pulse light waves which are returned by the circulator in the communication optical fiber and are in strain according to rules by using a photoelectric detector; the photoelectric detector transmits the pulse light waves received by the photoelectric detector according to the rule strain to the main control module, and the main control module identifies the pulse light waves according to the rule strain.
The scheme combines the distributed sensing technology with optical fiber communication, the information input end does not need to be accessed into an optical cable and only carries out strain excitation on the outer layer of the optical cable, the effect that the existing transmission equipment loses effect after being invaded and then communication cannot be finished can be avoided, and especially for the condition that certain information collection cannot use wireless or satellite return, the distributed sensing information transmission system uses the optical cable to return and can avoid illegal stealing.
In some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, a temperature signal, or a stress signal. When the optical fiber is affected by external environment (such as temperature, pressure, vibration, etc.), parameters such as intensity, phase, frequency, polarization state, etc. of the transmitted light in the optical fiber will change correspondingly.
In some embodiments of the second aspect of the present invention, the specific position of the outer layer of the communication fiber on which the physical signal acts is determined by a difference between a transmission time of the pulsed light source and a reception time of the photodetector. And calculating the change distance L, t12, c, r/2, wherein t12 is the difference between the sending time of the pulse light source and the receiving time of the photoelectric detector, c is the speed of light, and r is the refractive index of the group.
Due to the influence of resolution, the optical fiber needs to be lengthened to ensure stable identification of the sensing signal and effectively increase the extinction ratio. In some embodiments of the second aspect of the present invention, the specific location back end of the communication fiber where strain occurs has an extended fiber loop, the minimum fiber length L0 ═ T × c × r of the extended fiber loop to reduce the influence of the fiber end on backscattering, where T is the maximum pulse time of the pulsed light source, c is the speed of light, and r is the refractive index of the fiber group.
In some embodiments of the second aspect of the present invention, the physical signal is a vibration signal, the switching time difference of the vibration signal is a basic signal element, the duration of the basic signal element is T0, the waiting time of two adjacent basic signal elements is n × T0, T0 is greater than (LL/(c × r)). 2, where n is a positive integer, LL is the length of the optical fiber between the vibration signal application position and the circulator, c is the optical speed, and r is the refractive index of the optical fiber group.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. An information transmission system based on distributed sensing, comprising:
a pulsed light source (100) for outputting a lightwave signal;
a circulator (200), the circulator (200) having a first port, a second port, a third port; the first port of the circulator (200) is connected with the output end of the pulse light source (100);
a communication fiber (300), an input end of the communication fiber (300) being connected with a second port of the circulator (200);
the signal generator (400) is arranged on one side of the communication optical fiber (300) far away from the circulator (200) and is used for generating a physical signal and acting on the outer layer of the communication optical fiber (300) so as to enable the light wave signal to be strained according to a certain rule;
the input end of the photoelectric detector (500) is connected with the third port of the circulator (200) and is used for receiving the regularly strained light wave signal transmitted back by the communication optical fiber (300);
the main control module (600) is respectively and electrically connected with the pulse light source (100) and the photoelectric detector (500) and is used for controlling the output of the pulse light source (100), controlling the receiving of the photoelectric detector (500) and identifying the regularly strained light wave signals.
2. The distributed sensing-based information transmission system according to claim 1, wherein: the signal generator (400) comprises a fixing plate (410), a power source (420), a control chip (430) and a strain gauge (440), wherein the power source (420) is arranged on the fixing plate (410), the control chip (430) supplies power to the control chip (430) and the strain gauge (440), the control chip (430) is used for controlling the strain gauge (440) to output a physical signal according to a certain rule, and one side of the communication optical fiber (300) is fixed on the fixing plate (410) and is in contact with the strain gauge (440).
3. The distributed sensing-based information transmission system according to claim 2, wherein: the strain gauge (440) is an electromagnetic vibrator, a heater, or a stress generator.
4. The distributed sensing-based information transmission system according to claim 2, wherein: the communication fiber (300) has an extended fiber loop (450) on the fixing plate (410), and the minimum fiber length L0 ═ T ═ c ×, r of the extended fiber loop (450), where T is the maximum pulse time of the pulsed light source (100), c is the speed of light, and r is the fiber group refractive index.
5. The distributed sensing-based information transmission system according to claim 2, wherein: the strain gauge (440) is an electromagnetic vibrator, the switching time difference of the electromagnetic vibrator is a basic signal element, the duration of the basic signal element is T0, the waiting time of two adjacent basic signal elements is n T0, T0 is greater than (LL/(c r)). times.2, wherein n is a positive integer, LL is the set length of the optical fiber in contact with the strain gauge (440), c is the speed of light, and r is the refractive index of the optical fiber group.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113541800A (en) * | 2021-09-17 | 2021-10-22 | 高勘(广州)技术有限公司 | Communication method between base station and terminal and corresponding communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113541800A (en) * | 2021-09-17 | 2021-10-22 | 高勘(广州)技术有限公司 | Communication method between base station and terminal and corresponding communication system |
| CN113541800B (en) * | 2021-09-17 | 2021-12-03 | 高勘(广州)技术有限公司 | Communication method between base station and terminal and corresponding communication system |
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