CN115112935B - Optical fiber terminal device and data transmission system - Google Patents
Optical fiber terminal device and data transmission system Download PDFInfo
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- CN115112935B CN115112935B CN202210752427.1A CN202210752427A CN115112935B CN 115112935 B CN115112935 B CN 115112935B CN 202210752427 A CN202210752427 A CN 202210752427A CN 115112935 B CN115112935 B CN 115112935B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The invention discloses an optical fiber terminal device and a data transmission system, wherein the optical fiber terminal device comprises: a housing having an installation cavity therein; the electromagnetic generating assembly is arranged in the mounting cavity; the electromagnetic generating assembly is suitable for being connected with the output current of the local sensor; after the output current is introduced into the electromagnetic generating assembly, the electromagnetic generating assembly generates an induction magnetic field; an optical fiber assembly disposed in the mounting cavity; the fiber optic assembly includes a transmission fiber at least partially positioned in the induced magnetic field. The optical sensing transmission path of the electrical signal of the local sensor is constructed based on the weak current sensing principle of the optical fiber, and the electromagnetic interference resistance of the sensing data transmission process is improved. Compared with the existing electric sensing transmission technology, the anti-interference capability is strong, the transmission distance is long, and the adaptability is strong. Meanwhile, the on-site convergence of various electric sensing signals can be realized, and the length and the number of hard-wired cables from the site to the signal convergence device are greatly reduced.
Description
Technical Field
The invention relates to the technical field of data transmission, in particular to an optical fiber terminal device and a data transmission system.
Background
Physical parameters are important data sources of industrial sites, and generally comprise physical quantities such as temperature, pressure, flow, displacement and the like, and various physical parameters are measured by different sensors and converted into electric/optical signals for transmission. At present, an electrical sensing transmission technology is generally used for transmission, and an in-situ sensor generally transmits standard analog current (4-20 mA) or voltage signals (0-5V) to facilitate transmission and calculation due to different units and measurement ranges of physical quantities. Compared with voltage signals, current signals have the characteristics of high safety, long transmission distance, strong anti-interference performance and the like, so that 4-20mA analog current is commonly used as a standard transmission signal of sensing data in an industrial field.
However, when the hard-wired cable is used to transmit the analog current signal, the electric sensing transmission technology is prone to signal distortion caused by strong magnetic interference in the current signal transmission process.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that when the hard-wired cable is adopted to transmit the analog current signal by the electric sensing transmission technology in the prior art, the signal distortion is easily caused by strong magnetic interference in the current signal transmission process, so that the optical fiber terminal device and the data transmission system are provided.
To achieve the above object, an embodiment of the present invention provides an optical fiber terminal device including: a housing having an installation cavity therein; the electromagnetic generating assembly is arranged in the mounting cavity; the electromagnetic generating assembly is suitable for being connected with the output current of the local sensor; after the output current is introduced into the electromagnetic generating assembly, the electromagnetic generating assembly generates an induction magnetic field; an optical fiber assembly disposed in the mounting cavity; the fiber optic assembly includes a transmission fiber at least partially positioned in the induced magnetic field.
Optionally, the electromagnetic generating assembly includes: an electrical terminal disposed in the mounting cavity and extending out of the housing; the electrical terminal is adapted to be electrically connected to the output of the local sensor; a current-carrying coil connected to the electrical terminal; after the output current is introduced into the current-carrying coil, the current-carrying coil generates the induction magnetic field.
Optionally, the transmission fiber passes through the current-carrying coil and then is output outwards.
Optionally, a first opening and a second opening are formed in the shell, and the first opening and the second opening are communicated with the mounting cavity; the fiber optic assembly further includes: the optical fiber wiring port is arranged at the first opening; the optical fiber wiring port is connected with the input end of the transmission optical fiber; the optical fiber output port is arranged at the second opening and is connected with the output end of the transmission optical fiber.
Optionally, the optical fiber assembly further comprises: and the optical fiber collimators are arranged in the mounting cavity along the transmission path of the transmission optical fiber.
Optionally, the optical fiber assembly further comprises: and the magneto-optical crystal probe is arranged in the current-carrying coil and is arranged on the transmission path of the transmission optical fiber.
Optionally, the mounting cavity is filled with a magnetic field shielding layer, and the magnetic field shielding layer is composed of a high-permeability material.
Optionally, a magnetic field restraint layer is disposed inside the magnetic field shielding layer, the magnetic field restraint layer is made of a material with magnetic permeability lower than air, and the magnetic field restraint layer at least covers the optical fiber assembly and the electromagnetic generating assembly.
Optionally, a magnetic field gain layer is arranged in the magnetic field constraint layer, the magnetic field gain layer is made of stable high-permeability materials, and the magnetic field gain layer is arranged around the magneto-optical crystal probe and used for gaining the magnetic field intensity of the current-carrying coil around the magneto-optical crystal probe.
Optionally, a fixing slot is provided on the housing, and the fixing slots of a plurality of optical fiber terminal devices are adapted to be connected through a sliding rail, and the plurality of optical fiber terminal devices form an optical fiber terminal group.
The embodiment of the invention provides a data transmission system, which comprises: wavelength division multiplexer, industrial transmission cable, optical auxiliary device, and optical fiber termination device according to any of the above embodiments; one end of the optical auxiliary device is connected with the input end of the transmission optical fiber in the optical fiber terminal device through the industrial transmission optical cable and the wavelength division multiplexer, the other end of the optical auxiliary device is connected with the wavelength division multiplexer through the industrial transmission optical cable, and the wavelength division multiplexer is connected with the output end of the transmission optical fiber in the optical fiber terminal device.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the embodiment of the invention provides an optical fiber terminal device, which comprises: a housing having an installation cavity therein; the electromagnetic generating assembly is arranged in the mounting cavity; the electromagnetic generating assembly is suitable for being connected with the output current of the local sensor; after the output current is introduced into the electromagnetic generating assembly, the electromagnetic generating assembly generates an induction magnetic field; an optical fiber assembly disposed in the mounting cavity; the fiber optic assembly includes a transmission fiber at least partially positioned in the induced magnetic field.
In the working process, the electromagnetic generating component is used for being connected with the output current of the local sensor, and a weak magnetic field is generated inside the optical fiber terminal device after the electromagnetic generating component is connected with the output current. The optical fiber output polarized light optical signal is transmitted based on the optical fiber weak current sensing principle, the polarized light optical signal is influenced by a weak magnetic field, and polarized light can form a polarized angle. The polarized light analog signal modulated by the magnetic field is processed by the photoelectric detector, and then the measured value of the local sensor is calculated in real time. In addition, in the working process of the local sensor, when the physical parameter to be measured changes, the output current of the local sensor is increased, so that the internal magnetic field is enhanced, and the light polarization angle is also increased according to the Faraday magneto-optical conversion principle. The light polarization angle within the industrial fiber optic cable is then measured by the optical aid to calculate the respective physical parameter values. The optical sensing transmission path of the electrical signal of the local sensor is constructed based on the weak current sensing principle of the optical fiber, and the electromagnetic interference resistance of the sensing data transmission process is improved. Compared with the existing electric sensing transmission technology, the anti-interference capability is strong, the transmission distance is long, and the adaptability is strong. Meanwhile, the on-site convergence of various electric sensing signals can be realized, the length and the number of hard-wired cables from the site to the signal convergence device are greatly reduced, and thorough distributed measurement is realized.
2. According to the embodiment of the invention, the magnetic field shielding layer is formed by the high-permeability material, so that the magnetic field shielding layer can be used for shielding electromagnetic interference of an external environment, and the accuracy of current signal measurement is ensured. And the magnetic field restraint layer is made of a material slightly lower than the air permeability, can be used for restraining an excitation magnetic field of a current-carrying wire in the coil, reduces random leakage of the magnetic field, and ensures the stability of sensitivity in the electromagnetic conversion process. Meanwhile, the magnetic field gain layer is composed of stable high-permeability materials, can be used for gaining the magnetic field intensity of the current-carrying coil around the magneto-optical crystal probe, and increases the sensitivity of electro-magnetic-optical conversion in the optical fiber terminal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic view of the overall structure of an optical fiber terminal device according to an embodiment of the present invention;
FIG. 2 is a side view of an embodiment of a fiber optic terminal device according to the present invention;
FIG. 3 is a schematic view of an optical fiber terminal device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a plurality of fiber optic terminal devices forming a fiber optic terminal set according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a data transmission system according to an embodiment of the invention.
Reference numerals:
1. an electrical terminal; 2. a magnetic field shielding layer; 3. a magnetic field confinement layer; 4. a magnetic field gain layer; 5. a transmission optical fiber; 6. magneto-optical crystal probe; 7. an optical fiber connection port; 8. an optical fiber collimator; 9. a current-carrying coil; 10. a signal converging device; 11. an industrial transmission cable; 12. a terminal junction box; 13. an in-situ sensor; 14. a wavelength division multiplexer; 15. an industrial transmission optical cable; 16. an optical auxiliary device; 17. an optical fiber output port.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by a worker of ordinary skill in the art without making any inventive effort, are intended to be within the scope of this invention based on the embodiments of this invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention can be understood in a specific case by a worker of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Physical parameters are important data sources of industrial sites, and generally comprise physical quantities such as temperature, pressure, flow, displacement and the like, and various physical parameters are measured by different sensors and converted into electric/optical signals for transmission. Thus, the sensing data transmission technology can be classified into an analog optical signal, an analog electrical signal, a digital optical signal, and a digital electrical signal according to the type of transmission signal, wherein the analog signal belongs to the sensing transmission technology, and the digital signal belongs to the communication transmission technology.
The data transmission technology of various sensors is described as follows: 1) In the electric sensing transmission technology, because the units and measurement ranges of the physical quantities are different, the local sensor generally transmits the physical quantities into standard analog current (4-20 mA) or voltage signals (0-5V) so as to facilitate transmission and calculation. Compared with voltage signals, current signals have the characteristics of high safety, long transmission distance, strong anti-interference performance and the like, so that 4-20mA analog current is commonly used as a standard transmission signal of sensing data in an industrial field. 2) Optical sensor transmission technology, which uses an optical cable to transmit an analog optical signal output from an optical sensor. The analog optical signal is modulated by various physical quantities and its optical characteristics (such as intensity, wavelength, frequency and phase, etc.), and is sent into photoelectric detector by optical fiber, then its optical characteristics are measured, finally the measured physical quantity is calculated by means of signal processing device. Compared with the electric sensing transmission technology, the optical sensing transmission technology has the characteristics of electromagnetic interference resistance, electric insulation, corrosion resistance and the like. 3) With the development of chips and communication technologies, the optical/electrical communication transmission technology is a typical scheme for completing the digital transmission of field data by using an intelligent sensor and a communication optical cable or a common sensor and a remote IO and communication optical cable (using cables when transmission distances are relatively close) to complete the measurement, sampling and transmission of physical parameters in part of industrial fields. The technology adopts the optical cable as a transmission path of physical parameters, and has the characteristics of strong anti-interference capability, large signal capacity, long transmission distance and the like.
The existing data transmission technologies each have the following disadvantages: 1. in the electric sensing transmission technology, when a hard-wired cable is adopted to transmit an analog current signal, a) each sensor needs to be wired one by one to a control cabinet, the number of on-site hard-wiring is large, and the on-site wiring and overhaul workload is increased. b) The current signal transmission process is easy to cause signal distortion due to strong magnetic interference, the distance from a field sensor to a signal convergence device such as a control cabinet is generally long, and if electromagnetic shielding is carried out by adopting a shielding cable, the field wire laying cost is greatly increased. c) Before the current signals enter the signal converging device, the current signals are transferred through the electric connecting terminals, so that the field problem of complicated wiring is caused. 2. The optical sensing transmission technology can realize the multi-path physical quantity transmission of a single optical cable through multiplexing optical fibers and optical paths, and effectively solves a plurality of problems faced by the electric sensing transmission technology. However, the transmission technology must be bound to an optical sensor, that is, the sensor output signal must be an optical signal, so the application value of the transmission technology is limited by the use scenario of the optical sensor, for example, the optical sensor is difficult to apply to a closed polluted environment. Meanwhile, many industrial devices have integrated electrical sensors into the device prior to shipment, such as thermocouple temperature probes of hydraulic generators, and generally do not have the realistic condition of reinstalling the fiber optic sensors. 3. When the technology is used in an industrial field, the intelligent sensor or the remote communication IO needs to use an industrial-grade chip module and a high-protection-grade shell, so that the cost of field equipment, the power supply requirement and the maintenance cost are increased, and the failure rate is higher. Meanwhile, the technology is that the sensor or the remote IO is used for completing the digital sampling of the analog signal, then the analog signal is packaged by adopting an industrial protocol and then transmitted, and finally the signal converging device is used for completing the signal decoding. Under the mechanism, the sensing data can generate nondeterministic time delay due to the processes of collision monitoring, channel occupation, protocol analysis and the like, and the signal transmission requirement of a time sensitive scene is difficult to meet.
In a word, each data transmission technology has advantages and disadvantages, the technology 1 is most widely applied, and the prominent disadvantages are poor electromagnetic interference resistance and various wiring; the technology 2 has the advantages of no delay, interference resistance, large capacity and the like, is limited by the use scene of the optical fiber sensor, and has poor universality of scene application; technology 3 has also been applied more in industrial sites, but with higher costs and data transmission uncertainties than the sensor transmission technology.
The invention relates to the field of data transmission of industrial field sensors, in particular to an optical fiber terminal device and a data transmission system. The invention is used for converting the standard output current of the industrial sensor into the analog optical signal, and realizes the on-site convergence and low-time delay deterministic transmission of various physical parameters. In addition, the device can be used for replacing an electric wiring terminal used in an industrial field and a remote IO (input/output) and other acquisition devices arranged for realizing digital transmission, so that the on-site hard wiring length and number are greatly reduced, the anti-interference capability during sensing data transmission is improved, and thorough distributed measurement is realized.
Example 1
As shown in fig. 1 to 4, an embodiment of the present invention provides an optical fiber terminal device including a housing, an electromagnetic generating assembly, and an optical fiber assembly.
Specifically, in an embodiment of the invention, a mounting cavity is provided inside the housing, in which a electromagnetic generating assembly is provided, said electromagnetic generating assembly being adapted to be connected with the output current of the local sensor 13. In operation, the in-situ sensor 13 applies the output current to the electromagnetic generating assembly, which generates an induced magnetic field. An optical fiber assembly is arranged in the mounting cavity, the optical fiber assembly comprising a transmission optical fiber 5, the transmission optical fiber 5 being at least partially located in the induced magnetic field.
In the working process, the electromagnetic generating component is used for being connected with the output current of the local sensor 13, and a weak magnetic field is generated inside the optical fiber terminal device after the electromagnetic generating component is connected with the output current. The transmission optical fiber 5 outputs polarized light optical signals based on the optical fiber weak current sensing principle, the polarized light optical signals are influenced by weak magnetic fields, and polarized light forms a polarization angle. The polarized light analog signal modulated by the magnetic field is processed by the photoelectric detector, and then the measured value of the in-situ sensor 13 is calculated in real time. In addition, when the physical parameter to be measured changes during the operation of the local sensor 13, the output current of the local sensor 13 increases, so that the internal magnetic field is enhanced, and the light polarization angle also increases according to the Faraday magneto-optical conversion principle. The light polarization angle within the industrial fiber optic cable is then measured by the optical aid 16 to calculate the respective physical parameter values. By the arrangement, the optical sensing transmission path of the electric signal of the local sensor 13 is constructed based on the optical fiber weak current sensing principle, and the electromagnetic interference resistance of the sensing data transmission process is improved. Compared with the existing electric sensing transmission technology, the anti-interference capability is strong, the transmission distance is long, and the adaptability is strong. Meanwhile, the on-site convergence of various electric sensing signals can be realized, the length and the number of hard-wired cables from the site to the signal convergence device 10 are greatly reduced, and the thorough distributed measurement is realized.
Further, in an alternative embodiment of the invention, the electromagnetic generating assembly comprises an electric terminal 1 and a current carrying coil 9, the electric terminal 1 being arranged in the mounting cavity and protruding out of the housing, the electric terminal 1 being adapted to be connected with the output current of the local sensor 13. The current-carrying coil 9 is connected to the electric terminal 1, and the current-carrying coil 9 generates the induction magnetic field after the output current is supplied to the current-carrying coil 9. At the same time, the transmission fiber 5 passes through the current-carrying coil 9 and then is output outwards. The number of turns of the current-carrying coil 9 is not fixed, and the number of coils can be increased or decreased according to actual measurement requirements so as to customize the optical fiber terminal devices with different resolutions.
During operation, the electrical terminal 1 is used to switch in the output current of the in-situ sensor 13, which current enters the fiber optic terminal device via the current carrying coil 9 and creates a weak magnetic field inside the device. The transmission optical fiber 5 outputs polarized light optical signals based on the optical fiber weak current sensing principle, polarized light is influenced by a weak magnetic field and rotates along the circumferential direction of the current-carrying coil 9, and a polarization angle is formed between a polarization plane and the axial direction of the current-carrying coil 9. The polarized light analog signal modulated by the magnetic field is processed by the photodetector, and then the measured value of the in-situ sensor 13 can be calculated in real time.
Further, in an alternative embodiment of the present invention, the housing is provided with a first opening and a second opening, both of which are in communication with the mounting cavity. The optical fiber assembly further comprises an optical fiber wiring port 7 and an optical fiber output port 17, wherein the optical fiber wiring port 7 is arranged at the first opening, and the optical fiber wiring port 7 is connected with the input end of the transmission optical fiber 5. An optical fiber output port 17 is disposed in the second opening, and the optical fiber output port 17 is connected to the output end of the transmission optical fiber 5. The fiber patch port 7 and the fiber output port 17 are used to connect and secure the transmission fiber 5.
Further, in an alternative embodiment of the invention, the fiber assembly further comprises a number of fiber collimators 8, the number of fiber collimators 8 being arranged in the mounting cavity along the transmission path of the transmission fiber 5. For example, the fiber collimator 8 may be disposed at the fiber patch port 7, and the fiber collimator 8 may be disposed at the end of the current-carrying coil 9, and may be disposed at the fiber output port 17, along the transmission direction of the transmission fiber 5.
Of course, the present embodiment is merely illustrative of the installation position of the fiber collimator 8, but is not limited thereto, and those skilled in the art can change the installation position according to the actual situation, and can achieve the same technical effects.
Further, in an alternative embodiment of the present invention, the optical fiber assembly further includes a magneto-optical crystal probe 6, the magneto-optical crystal probe 6 is disposed in the current-carrying coil 9, and the magneto-optical crystal probe 6 is disposed on a transmission path of the transmission optical fiber 5. In operation, a polarized light analog signal enters the magneto-optical crystal probe 6 through the fiber collimator 8. The magneto-optical crystal probe 6 in the optical fiber terminal device is not fixed in length, and the longer the length is, the higher the sensitivity of magneto-optical conversion in the optical fiber terminal device is, and the lower the linearity is.
Of course, the present embodiment is merely illustrative of the length of the magneto-optical crystal probe 6, but is not limited thereto, and those skilled in the art can vary according to the actual situation, and can achieve the same technical effects.
Further, in an alternative embodiment of the invention, the mounting cavity is filled with a magnetic field shielding layer 2, the magnetic field shielding layer 2 being composed of a high permeability material, such as a nickel based alloy. The magnetic field shielding layer 2 is internally provided with a magnetic field confining layer 3, the magnetic field confining layer 3 being composed of a material having a permeability lower than air, such as ferrite. The magnetic field confinement layer 3 at least encloses the optical fiber assembly and the electromagnetic generating assembly. The magnetic field confinement layer 3 is internally provided with a magnetic field gain layer 4, the magnetic field gain layer 4 is made of stable high magnetic permeability material, for example, iron-aluminum alloy, and the magnetic field gain layer 4 is arranged around the magneto-optical crystal probe 6 and is used for gaining the magnetic field intensity of the current-carrying coil 9 around the magneto-optical crystal probe 6.
According to the embodiment of the invention, the magnetic field shielding layer 2 is formed by the high-permeability material, so that the magnetic field shielding layer 2 can be used for shielding electromagnetic interference of an external environment, and the accuracy of current signal measurement is ensured. And the magnetic field restraint layer 3 is made of a material slightly lower than the air permeability, and can be used for restraining the exciting magnetic field of the current-carrying wire in the coil, reducing the random leakage of the magnetic field and ensuring the stability of the sensitivity of the electromagnetic conversion process. Meanwhile, the magnetic field gain layer 4 is composed of stable high-permeability materials, and can be used for gaining the magnetic field intensity of the current-carrying coil 9 around the magneto-optical crystal probe 6, so that the sensitivity of electro-magnetic-optical conversion in the optical fiber terminal is improved.
Optionally, a fixing slot is provided on the housing, and the fixing slots of the optical fiber terminal devices are adapted to be connected through a sliding rail, and the optical fiber terminal devices form an optical fiber terminal group for constructing a transmission path of multiple optical sensing signals.
Example 2
As shown in fig. 5, an embodiment of the present invention provides a data transmission system, including: wavelength division multiplexer 14, industrial transmission cable 15, optical auxiliary device 16, and optical fiber termination device as described in any of the above embodiments. In this embodiment, the optical fiber terminal device is exemplified by a length of 30mm, a height of 60mm, and a width of 110 mm. One end of the optical auxiliary device 16 is connected with the input end of the transmission optical fiber 5 in the optical fiber terminal device through the industrial transmission optical cable 15 and the wavelength division multiplexer 14, the other end of the optical auxiliary device 16 is connected with the wavelength division multiplexer 14 through the industrial transmission optical cable 15, and the wavelength division multiplexer 14 is connected with the output end of the transmission optical fiber 5 in the optical fiber terminal device. As shown in fig. 5, the data transmission system further includes a signal converging device 10, an industrial transmission cable 11, a terminal junction box 12, and an in-situ sensor 13, which are sequentially connected.
In the working process, the optical signals modulated by the magnetic field are transmitted to an optical auxiliary system through the wavelength division multiplexer 14 and the industrial transmission optical cable 15, and after being measured by the photoelectric detector, the calculation results are transmitted to a display in real time for display. Specifically, when the physical parameter to be measured changes, the output current of the local sensor 13 increases, the magnetic field in the magnetic field gain layer 4 increases, and the light polarization angle increases according to the faraday magneto-optical conversion principle. The light polarization angle within the industrial fiber optic cable is then measured by the optical aid 16 to calculate the respective physical parameter values.
In the embodiment of the invention, the optical fiber terminal group is assembled into a multi-path current signal and is converted into a multi-path optical signal, when the optical fiber terminal group is used in the field, one industrial transmission optical cable 15 comprises a plurality of optical cores, and the wave division multiplexer 14 is adopted to realize the transmission of the multi-path signal by one optical core.
The optical fiber terminal device provided by the embodiment of the invention is used for replacing an electrical terminal, a remote IO (input/output) and other acquisition devices used in an industrial field, and thoroughly distributed measurement is realized. And moreover, by introducing measurement criteria of magnetic induction intensity and physical parameters, the measurement requirements of the physical parameters can be dynamically matched, so that the reliability of data transmission is higher, and the application scene of the device is wider.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the various aspects of the invention will be apparent to persons of ordinary skill in the art upon reading the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (6)
1. An optical fiber termination device, comprising:
a housing having an installation cavity therein;
the electromagnetic generating assembly is arranged in the mounting cavity; the electromagnetic generating assembly is adapted to be connected with an output current of an in-situ sensor (13); after the output current is introduced into the electromagnetic generating assembly, the electromagnetic generating assembly generates an induction magnetic field;
an optical fiber assembly disposed in the mounting cavity; the optical fiber assembly comprises a transmission optical fiber (5), wherein the transmission optical fiber (5) is at least partially positioned in the induced magnetic field;
the electromagnetic generating assembly includes:
an electric terminal (1) arranged in the mounting cavity and protruding out of the housing; the electrical terminal (1) is adapted to be galvanically connected to the output of the local sensor (13);
a current-carrying coil (9) connected to the electrical terminal (1); after the output current is introduced into the current-carrying coil (9), the current-carrying coil (9) generates the induction magnetic field;
the shell is provided with a first opening and a second opening, and the first opening and the second opening are communicated with the mounting cavity; the fiber optic assembly further includes:
an optical fiber connection port (7) provided in the first opening; the optical fiber wiring port (7) is connected with the input end of the transmission optical fiber (5);
an optical fiber output port (17) arranged at the second opening, wherein the optical fiber output port (17) is connected with the output end of the transmission optical fiber (5);
the installation cavity is filled with a magnetic field shielding layer (2), a magnetic field restraining layer (3) is arranged in the magnetic field shielding layer (2), the magnetic field restraining layer (3) is made of a material lower than air permeability, and the magnetic field restraining layer (3) at least covers the optical fiber component and the electromagnetic generating component;
the fiber optic assembly further includes: a magneto-optical crystal probe (6) disposed in the current-carrying coil (9);
a magnetic field gain layer (4) is arranged in the magnetic field constraint layer (3), the magnetic field gain layer (4) is made of stable high-permeability materials, and the magnetic field gain layer (4) is arranged around the magneto-optical crystal probe (6) and is used for gaining the magnetic field intensity of the current-carrying coil (9) around the magneto-optical crystal probe (6);
the optical fiber terminal device comprises a shell, a plurality of optical fiber terminal devices and a plurality of fixing clamping grooves, wherein the shell is provided with the fixing clamping grooves, the fixing clamping grooves of the optical fiber terminal devices are suitable for being connected through sliding rails, and the optical fiber terminal devices form an optical fiber terminal group.
2. Fiber optic terminal device according to claim 1, characterized in that the transmission fiber (5) is output outwards after passing through the current carrying coil (9).
3. The fiber optic terminal device according to claim 1, wherein the fiber optic assembly further comprises:
and a plurality of optical fiber collimators (8) are arranged in the mounting cavity along the transmission path of the transmission optical fiber (5).
4. A fiber optic terminal device according to claim 3, wherein the magneto-optical crystal probe (6) is disposed on the transmission path of the transmission fiber (5).
5. Fiber optic terminal arrangement according to claim 4, characterized in that the magnetic field shielding layer (2) consists of a high permeability material.
6. A data transmission system, comprising:
wavelength division multiplexer (14), industrial transmission cable (15), optical auxiliary device (16) and optical fiber termination device according to any of the preceding claims 1 to 5;
one end of the optical auxiliary device (16) is connected with the input end of the transmission optical fiber (5) in the optical fiber terminal device through the industrial transmission optical cable (15) and the wavelength division multiplexer (14), the other end of the optical auxiliary device (16) is connected with the wavelength division multiplexer (14) through the industrial transmission optical cable (15), and the wavelength division multiplexer (14) is connected with the output end of the transmission optical fiber (5) in the optical fiber terminal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210752427.1A CN115112935B (en) | 2022-06-28 | 2022-06-28 | Optical fiber terminal device and data transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210752427.1A CN115112935B (en) | 2022-06-28 | 2022-06-28 | Optical fiber terminal device and data transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115112935A CN115112935A (en) | 2022-09-27 |
| CN115112935B true CN115112935B (en) | 2023-06-20 |
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