CN117723886A

CN117723886A - Remote monitoring system and method for photoelectric composite cable

Info

Publication number: CN117723886A
Application number: CN202311719401.8A
Authority: CN
Inventors: 刘友风; 潘光明; 覃举存
Original assignee: Shenzhen Wantong Information Technology Co ltd
Current assignee: Shenzhen Wantong Information Technology Co ltd
Priority date: 2023-12-14
Filing date: 2023-12-14
Publication date: 2024-03-19

Abstract

The invention provides a remote monitoring system and a remote monitoring method for a photoelectric composite cable, wherein a control unit sends first optical communication data to an optical cable of the photoelectric composite cable, a control signal receiving unit analyzes the first optical communication data to obtain control instruction data, an infrared laser generating unit sends a photoelectric composite cable temperature monitoring signal to the optical cable of a rear section of the photoelectric composite cable according to the control instruction data, a monitoring signal receiving unit detects an optical signal of a back scattering signal in the optical cable of the rear section of the photoelectric composite cable, a light splitting unit separates Stokes scattering light and anti-Stokes scattering light from the back scattering signal, a temperature measuring data processing unit generates second optical communication data and sends the second optical communication data to the control unit, and the control unit analyzes the second optical communication data to obtain temperature distribution data of the rear section of the photoelectric composite cable, so that the working temperature distribution of the photoelectric composite cable can be monitored, and the assessment, fault early warning and fault positioning of the running state of the electric power optical cable can be realized.

Description

Remote monitoring system and method for photoelectric composite cable

Technical Field

The invention relates to the technical field of photoelectric composite cables, in particular to a remote monitoring system and a method of a photoelectric composite cable.

Background

An Optical-electrical composite cable (Optical-Electrical Composite Cable) is a communication cable that integrates Optical fiber and cable functions. The optical fiber and the cable are simultaneously arranged in the same cable body, so that the integration of optical fiber communication and power transmission is realized. An optical-electrical composite cable is generally composed of an optical fiber portion and a cable portion together. The optical fiber part comprises one or more fine glass or plastic fibers for transmitting optical signals, and the optical fiber has the characteristics of high bandwidth and low loss, can transmit a large amount of data, and is not affected by electromagnetic interference. The cable part includes a wire for transmitting electric power and an electric signal and an insulating layer wrapped outside the wire for protecting the wire, and the wire is generally made of a conductor such as copper or aluminum, and can transmit high-power electric power and low-frequency electric signals. Because the photoelectric composite cable has the characteristics of high bandwidth, low loss, strong anti-interference capability, communication power supply integration and the like, the deployment cost and stability are far higher than those of wireless communication, and the photoelectric composite cable is often applied to the field of long-distance wired communication in special application environments, such as seabed, mines, oil fields and the like. Because the deployment environment of the photoelectric composite cable is complex and often needs to face relatively severe environmental conditions, the cable in the photoelectric composite cable can be influenced by severe conditions such as mechanical stress, chemical corrosion and thermal aging for a long time in the use process, and meanwhile, the cable in the photoelectric composite cable can generate heat in the use process, and the relatively airtight deployment environment is unfavorable for heat emission, so that the photoelectric composite cable works in a high-temperature environment for a long time, and the severe working environment leads to easy aging and damage of an insulation system of the photoelectric composite cable, so that the photoelectric composite cable applied to a long-distance wired communication scene often has a very high failure rate.

Disclosure of Invention

Based on the problems, the invention provides a remote monitoring system and a method for a photoelectric composite cable, which can monitor the working temperature distribution of the photoelectric composite cable and realize the evaluation, fault early warning and fault positioning of the running state of the electric power optical cable.

In view of this, a first aspect of the present invention proposes a relay temperature measurement module for remote monitoring of an optical-electrical composite cable, the relay temperature measurement module comprising a housing, and a relay unit, a monitoring signal generating unit, a monitoring signal receiving unit and a first coupling unit mounted in the housing, the housing surface having a first interface for connecting a front-section optical-composite cable and a second interface for connecting a rear-section optical-composite cable, the optical cable and the cable of the front-section optical-composite cable being connected to the relay temperature measurement module through the first interface, the first coupling unit being disposed at the second interface for connection to a head end of the optical cable of the rear-section optical-composite cable, the monitoring signal generating unit, the monitoring signal receiving unit and the cable of the relay unit being connected to the optical cable of the front-section optical-composite cable for supplying power through the cable, one end of the relay unit being connected to a tail end of the optical cable of the front-section optical-composite cable, the other end being connected to a starting end of the optical-cable of the rear-section optical-composite cable through the first coupling unit, the monitoring signal generating unit and the monitoring signal receiving unit being connected to the optical-cable of the temperature compensation signal compensating unit being used for transmitting signal attenuation signal from the optical-signal from the front-section optical-composite cable to the optical-composite cable.

Further, the relay temperature measurement module further comprises a second coupling unit connected to the front of the monitoring signal generating unit and the monitoring signal receiving unit, the monitoring signal generating unit receives control instruction data through the second coupling unit, the monitoring signal receiving unit sends optical communication data to a control unit of a remote monitoring system of the photoelectric composite cable through the second coupling unit, the optical communication data comprise backscattered signal data of an optical cable of the rear-section photoelectric composite cable, and one end of the relay unit is connected with the tail end of the optical cable of the front-section photoelectric composite cable specifically, and the relay unit is connected with the tail end of the optical cable of the front-section photoelectric composite cable through the second coupling unit.

Further, the monitoring signal generating unit includes an infrared laser generating unit for generating an infrared laser pulse signal and a control signal receiving unit including a first photoelectric conversion unit for converting a received optical signal into an electrical signal, a first signal amplifying unit for amplifying the electrical signal, a first automatic gain control unit for automatically controlling an amplification factor of the first signal amplifying unit according to an amplitude of the electrical signal, a first equalizing unit for correcting a waveform of the electrical signal, a first pulse regenerating unit for recovering a pulse waveform of the electrical signal, and a signal demodulating unit for recovering the electrical signal into original data.

Further, the monitoring signal receiving unit includes a light splitting unit for separating stokes scattered light and anti-stokes scattered light from the optical signal of the back-scattered signal, and a thermometry data processing unit including a second photoelectric conversion unit for converting the stokes scattered light and the anti-stokes scattered light into electric signals, respectively, a second signal amplifying unit for amplifying the stokes scattered light and the anti-stokes scattered light, and an analog-to-digital conversion unit for analog-to-digital converting the amplified stokes scattered light and anti-stokes scattered light.

Further, the relay unit includes a third photoelectric conversion unit for converting a received optical signal into an electrical signal, a third signal amplification unit for amplifying the electrical signal, a second automatic gain control unit for automatically controlling an amplification factor of the third signal amplification unit according to an amplitude of the electrical signal, a second equalization unit for correcting a waveform of the electrical signal, a second pulse regeneration unit for recovering a pulse waveform of the electrical signal, and a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of a rear-stage photoelectric composite cable.

The second aspect of the invention provides a remote monitoring system of a photoelectric composite cable, which comprises a control unit, a communication unit and a power supply unit which are connected at the starting end of a first section of photoelectric composite cable, and also comprises a relay temperature measurement module according to any one of the first aspect of the invention which is connected between any two sections of photoelectric composite cables.

Further, in the above-mentioned remote monitoring system for a photoelectric composite cable, the relay temperature measurement module is set in the photoelectric composite cable at a preset spacing distance DL, where the spacing distance DL satisfies the following conditionsWherein P is _emit The optical power of the infrared laser pulse signal emitted by the infrared laser generating unit is P ₀ And alpha is the attenuation coefficient of the optical cable in the photoelectric composite cable, and is a preset minimum optical power threshold value of the back scattering signal.

The third aspect of the invention provides a remote monitoring system of an optical-electrical composite cable, comprising a control unit, a communication unit and a power supply unit which are connected at the starting end of a first-section optical-electrical composite cable, a relay unit which is connected between any two sections of optical-electrical composite cables, and further comprising a monitoring signal generating unit, a monitoring signal receiving unit and a first coupling unit which are connected at the starting end of each section of optical-electrical composite cable, wherein the monitoring signal generating unit, the monitoring signal receiving unit and the relay unit are connected with the tail end of an optical cable of a front-section optical-electrical composite cable through the first coupling unit, one end of the relay unit is connected with the starting end of the optical cable of a rear-section optical-electrical composite cable, the other end of the relay unit is connected with the starting end of the optical cable of the rear-section optical-electrical composite cable through the first coupling unit, the communication unit is used for transmitting first optical communication data to the optical cable of the optical-electrical composite cable under the control of the control unit, the monitoring signal generating unit is used for transmitting first optical communication data to the optical cable, the monitoring signal generating unit is used for compensating the monitoring signal to the optical cable of the rear-section optical-electrical composite cable through the first coupling unit, the optical-electrical composite cable is used for transmitting a temperature signal to the optical-electrical composite cable of the optical-thermal-electrical composite cable, and the monitoring signal is continuously used for compensating the optical signal from the optical-electrical composite cable of the rear-section optical-electrical composite cable through the optical-optical composite cable.

Further, in the above-mentioned remote monitoring system for a photoelectric composite cable, the first optical communication data includes control instruction data for controlling the monitoring signal generating unit to send a photoelectric composite cable temperature monitoring signal to an optical cable of a rear-section photoelectric composite cable, the remote monitoring system further includes a second coupling unit connected before the monitoring signal generating unit and the monitoring signal receiving unit, the monitoring signal generating unit receives the first optical communication data through the second coupling unit to obtain the control instruction data in a parsing manner, the monitoring signal receiving unit sends second optical communication data to the control unit through the second coupling unit, the second optical communication data includes backscattered signal data of an optical cable of the rear-section photoelectric composite cable, and an end connection between one end of the relay unit and an end of the optical cable of the front-section photoelectric composite cable is specifically that the relay unit is connected with an end of the optical cable of the front-section photoelectric composite cable through the second coupling unit.

Further, in the remote monitoring system of the photoelectric composite cable, the monitoring signal generating unit includes an infrared laser generating unit for generating an infrared laser pulse signal and a control signal receiving unit, and the control signal receiving unit includes a first photoelectric conversion unit for converting a received optical signal into an electrical signal, a first signal amplifying unit for amplifying the electrical signal, a first automatic gain control unit for automatically controlling an amplification factor of the first signal amplifying unit according to an amplitude of the electrical signal, a first equalizing unit for correcting a waveform of the electrical signal, a first pulse regenerating unit for recovering a pulse waveform of the electrical signal, and a signal demodulating unit for recovering the electrical signal into original data.

Further, in the remote monitoring system of the photoelectric composite cable, the monitoring signal receiving unit includes a light splitting unit for separating stokes scattered light and anti-stokes scattered light from the optical signal of the back scattered signal, and a thermometry data processing unit, and the thermometry data processing unit includes a second photoelectric conversion unit for converting the stokes scattered light and the anti-stokes scattered light into electric signals, a second signal amplification unit for amplifying the stokes scattered light and the anti-stokes scattered light, and an analog-to-digital conversion unit for analog-to-digital converting the amplified stokes scattered light and anti-stokes scattered light.

Further, in the above-described remote monitoring system for an optical-electrical composite cable, the relay unit includes a third optical-electrical conversion unit for converting the received optical signal into an electrical signal, a third signal amplification unit for amplifying the electrical signal, a second automatic gain control unit for automatically controlling an amplification factor of the third signal amplification unit according to an amplitude of the electrical signal, a second equalization unit for correcting a waveform of the electrical signal, a second pulse regeneration unit for recovering a pulse waveform of the electrical signal, a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of a rear-stage optical-electrical composite cable, and a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of an optical-electrical composite cable.

Further, in the remote monitoring system for a photoelectric composite cable, the relay unit, the monitoring signal generating unit, and the monitoring signal receiving unit are set in the photoelectric composite cable at a preset spacing distance DL, where the spacing distance DL satisfiesWherein P is _emit The optical power of the infrared laser pulse signal emitted by the infrared laser generating unit is P ₀ And alpha is the attenuation coefficient of the optical cable in the photoelectric composite cable, and is a preset minimum optical power threshold value of the back scattering signal.

A fourth aspect of the present invention provides a remote monitoring method for an optical-electrical composite cable, including:

the control unit sends first optical communication data to the optical cable of the photoelectric composite cable through the communication unit, wherein the first optical communication data comprises control instruction data for controlling the monitoring signal generation unit to send a photoelectric composite cable temperature monitoring signal to the optical cable of the rear section photoelectric composite cable;

the control signal receiving unit receives the first optical communication data through the second coupling unit;

analyzing the first optical communication data to obtain the control instruction data;

the infrared laser generating unit sends a photoelectric composite cable temperature monitoring signal to an optical cable of the rear section photoelectric composite cable according to the control instruction data, wherein the photoelectric composite cable temperature monitoring signal is an infrared laser pulse signal with preset frequency, and the infrared laser pulse signal carries signal sending time;

The monitoring signal receiving unit detects an optical signal of a backward scattering signal in an optical cable of the rear-section photoelectric composite cable through the first coupling unit;

separating stokes scattered light and anti-stokes scattered light from the optical signal of the back-scattered signal by a light splitting unit;

generating second optical communication data corresponding to the stokes scattered light and the anti-stokes scattered light by a thermometry data processing unit;

transmitting the second optical communication data to the control unit through an optical cable of the photoelectric composite cable;

and the control unit obtains the temperature distribution data of the rear-section photoelectric composite cable by analyzing the second optical communication data.

Further, in the above remote monitoring method for an optical-electrical composite cable, the step of detecting, by the monitoring signal receiving unit, an optical signal of a backscattered signal in an optical cable of the rear-section optical-electrical composite cable through the first coupling unit specifically includes:

acquiring a preset temperature distribution sampling distance SL;

the infrared laser generating unit sends a photoelectric composite cable temperature monitoring signal to an optical cable of the rear section photoelectric composite cable according to the control instruction data, and then sends a detection starting signal to the monitoring signal receiving unit;

The monitoring signal receiving unit starts timing after receiving the detection starting signal;

when the timing reaches the first time length T ₁ At the time of a second time length T ₂ Sampling the back scattering signal in the back-end photoelectric composite cable for a period, wherein the first time length T ₁ And the second time length T ₂ The method meets the following conditions:

where c is the speed of light.

Further, in the above-mentioned remote monitoring method of an optical-electrical composite cable, the step of generating, by the thermometry data processing unit, second optical communication data corresponding to the stokes scattered light and the anti-stokes scattered light specifically includes:

converting optical signals of the stokes scattered light and the anti-stokes scattered light into analog electrical signals by a second photoelectric conversion unit;

amplifying the analog electrical signal by a second signal amplifying unit;

measuring signal intensities of the analog electrical signals of the stokes scattered light and anti-stokes scattered light;

performing analog-to-digital conversion on the analog electrical signal to generate corresponding stokes scatter digital electrical signals and anti-stokes scatter digital electrical signals;

determining the receiving time of the back scattering signal as the receiving time corresponding to the stokes scattering digital electric signal and the anti-stokes scattering digital electric signal;

Modulating the time of reception of the back-scattered signal, the signal strength of the analog electrical signals of the stokes scattered light and the anti-stokes scattered light, the stokes scattered digital electrical signal, and the anti-stokes scattered digital electrical signal into the second optical communication data.

Further, in the above method for remotely monitoring a photoelectric composite cable, the step of the control unit obtaining the temperature distribution data of the rear-section photoelectric composite cable by analyzing the second optical communication data specifically includes:

analyzing the second optical communication data to obtain a time parameter and a signal intensity parameter of the photoelectric composite cable temperature monitoring signal, wherein the time parameter comprises the signal sending time of the infrared laser pulse signal and the receiving time of the back scattering signal, and the signal intensity parameter comprises the signal intensities of the analog electric signals of the Stokes scattered light and the anti-Stokes scattered light;

calculating a target position of the rear-section photoelectric composite cable corresponding to the second optical communication data according to the time parameter;

calculating the temperature of the target position according to the signal intensity parameter;

And generating temperature distribution data of the rear-section photoelectric composite cable based on the target position and the temperature of the target position.

Drawings

FIG. 1 is a schematic diagram of a relay temperature measurement module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a monitoring signal generating unit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a monitoring signal receiving unit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a relay unit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a remote monitoring system for an optical-electrical composite cable according to an embodiment of the present invention;

fig. 6 is a flowchart of a remote monitoring method of an optical-electrical composite cable according to an embodiment of the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements 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. The terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of this specification, the terms "one embodiment," "some implementations," "particular embodiments," and 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 invention. In this specification, schematic representations of the above terms 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.

A remote monitoring system and method for an optical-electrical composite cable according to some embodiments of the present invention are described below with reference to the accompanying drawings.

As shown in fig. 1, a first aspect of the present invention proposes a relay temperature measurement module for remote monitoring of an optical-electrical composite cable, the relay temperature measurement module includes a housing, a relay unit installed in the housing, a monitoring signal generating unit, a monitoring signal receiving unit, and a first coupling unit, the surface of the housing has a first interface for connecting a front-section optical-composite cable and a second interface for connecting a rear-section optical-composite cable, the optical cable and the cable of the front-section optical-composite cable are connected to the relay temperature measurement module through the first interface, the first coupling unit is disposed at the second interface for connecting a front end of the optical cable of the rear-section optical-composite cable, the monitoring signal generating unit, the monitoring signal receiving unit, and the relay unit are connected to the optical cable of the front-section optical-composite cable so as to supply power through the cable, one end of the relay unit is connected to an end of the optical cable of the front-section optical-composite cable, the other end is connected to a starting end of the optical cable of the rear-section optical-composite cable through the first coupling unit, the optical-cable and the optical-cable is connected to a starting end of the rear-section optical-composite cable, the first coupling unit and the monitoring signal receiving unit is connected to the optical-cable through the first coupling unit, the temperature compensation signal is connected to the optical-cable of the rear-section optical-composite cable through the optical-cable, and the temperature compensation signal is continuously transmitted from the front-section optical-composite cable to the monitoring signal generating unit.

The relay temperature measurement module is particularly applied to a long-distance wired communication scene, and particularly applied to a wired communication scene in which a plurality of segmented photoelectric composite cables are used for communication transmission.

In the technical scheme of the invention, the photoelectric composite cable comprises a plurality of segments, each segment of photoelectric composite cable comprises an optical cable and a cable which are wrapped by insulating materials, and as the optical signals in the optical cable are attenuated due to the influence of various factors in the long-distance transmission process, common causes of the attenuation of the optical signals in the optical cable comprise optical fiber absorption loss, optical fiber scattering loss, optical fiber bending loss and the like, each two adjacent segments of the photoelectric composite cable are connected through a relay unit so as to realize compensation of the attenuation of the optical signals of the optical cable in the photoelectric composite cable.

In the technical scheme of the invention, the sections of the photoelectric composite cable are sequentially connected through the relay unit, the first section of the photoelectric composite cable is the section positioned at the forefront end of the photoelectric composite cable, and it is known that the photoelectric composite cable does not have directivity, and any one of the two ends of the photoelectric composite cable is determined to be the forefront end for convenience in describing the direction of the photoelectric composite cable manually. Similarly, after the direction of the photoelectric composite cable is defined, the front-section photoelectric composite cable is a section located in front of the relay unit, the rear-section photoelectric composite cable is a section located behind the relay unit, and the start end and the tail end of any section are also distinguished in the above manner. Those skilled in the art will recognize that the present invention can be implemented by reversing the direction defined by the person, and thus the setting of the direction in the present invention should not be construed as limiting the scope of the present invention.

The back scattering signal refers to a scattering signal transmitted in the direction of the source of the optical signal, which is caused by the scattering phenomenon generated by the interaction of light and stray factors in the process of transmitting the optical signal in the optical fiber. The stray factor is a factor that causes the optical fiber material to have non-uniformity, such as impurities in the optical fiber, non-uniformity in material structure, and variation in refractive index profile of the core and the cladding.

Further, with continued reference to fig. 1, the relay temperature measurement module further includes a second coupling unit connected before the monitoring signal generating unit and the monitoring signal receiving unit, where the monitoring signal generating unit receives control instruction data through the second coupling unit, the monitoring signal receiving unit sends optical communication data to a control unit of a remote monitoring system of the photoelectric composite cable through the second coupling unit, the optical communication data includes backscattered signal data of an optical cable of a rear section photoelectric composite cable, and one end of the relay unit is connected with an end of an optical cable of a front section photoelectric composite cable specifically, and the relay unit is connected with an end of an optical cable of the front section photoelectric composite cable through the second coupling unit.

Specifically, the back scattering signal data is digital signal data obtained by performing light splitting, amplification and analog-to-digital conversion on the back scattering signal. In other embodiments of the present invention, each relay temperature measurement module further includes a control unit, a communication unit and a second coupling unit, where the control unit is connected to the monitoring signal generating unit and the monitoring signal receiving unit, and is configured to send a temperature measurement control instruction to the monitoring signal generating unit, and process the backscattered signal data output by the monitoring signal receiving unit to obtain temperature distribution data of an optical cable of a rear-section photoelectric composite cable, where the communication unit is connected to the relay unit through the second coupling unit and is connected to an optical cable of a front-section photoelectric composite cable, and where the communication unit, the monitoring signal generating unit, the monitoring signal receiving unit and the relay unit are connected to an optical cable of a rear-section photoelectric composite cable through the first coupling unit, and where the control unit sends the temperature distribution data to a remote monitoring device through the communication unit.

Further, as shown in fig. 2, the monitoring signal generating unit includes an infrared laser generating unit for generating an infrared laser pulse signal and a control signal receiving unit including a first photoelectric conversion unit for converting a received optical signal into an electrical signal, a first signal amplifying unit for amplifying the electrical signal, a first automatic gain control unit for automatically controlling an amplification factor of the first signal amplifying unit according to an amplitude of the electrical signal, a first equalizing unit for correcting a waveform of the electrical signal, a first pulse regenerating unit for recovering a pulse waveform of the electrical signal, and a signal demodulating unit for recovering the electrical signal into original data.

Preferably, in some embodiments of the present invention, the infrared laser generating unit is a laser pulse generator in a range of 1000 to 1300 nm, and the temperature monitoring signal of the photoelectric composite cable is an infrared laser pulse signal.

Specifically, the first photoelectric conversion unit is configured to convert an optical signal into an electrical signal, which may be a PIN photodiode or an APD avalanche photodiode, where the electrical signal is weak and has waveform distortion after the optical signal in the optical fiber is converted into the electrical signal by the first photoelectric conversion unit, and the electrical signal needs to be amplified by the first signal amplification unit, and the waveform of the electrical signal is recovered by the first equalization unit and the first pulse regeneration unit. In some embodiments of the present invention, the first signal amplifying unit includes a first pre-amplifying unit with low noise and high gain, and a first main amplifying unit for adjusting the electric signal to a target level amplitude. The first pulse regeneration unit comprises a first clock recovery unit and a first decision unit, wherein the first clock recovery unit is used for clamping and shaping signals output by the first equalization unit to obtain non-return-to-zero codes, then performing nonlinear processing on the non-return-to-zero codes to change the non-return-to-zero codes into return-to-zero codes, and finally obtaining corresponding clock signals through tuning amplification, amplitude limiting, shaping and phase shifting, the first decision unit is used for processing the signals output by the first equalization unit according to the time signals, and when the level of the signals output by the first equalization unit is greater than a given level threshold value, the signals are judged to be 1, otherwise, the signals are judged to be 0, and accordingly digital signals corresponding to optical signals transmitted in an optical cable of a front-stage photoelectric composite cable are recovered.

In some embodiments of the present invention, the monitoring signal generating unit includes only the infrared laser generating unit, the relay temperature measuring module further includes a modulation and demodulation unit for modulating and demodulating an optical signal in an optical cable of the optical-electrical composite cable, the modulation and demodulation unit includes a first photoelectric conversion unit for converting a received optical signal into an electrical signal, a first signal amplification unit for amplifying the electrical signal, a first automatic gain control unit for automatically controlling an amplification factor of the first signal amplification unit according to an amplitude of the electrical signal, a first equalization unit for correcting a waveform of the electrical signal, a first pulse regeneration unit for recovering a pulse waveform of the electrical signal, a signal demodulation unit for recovering the electrical signal into original data, and a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of the optical-electrical composite cable. The modulation and demodulation unit is used for receiving optical communication data from the optical cable to analyze and obtain the control instruction data, so that the monitoring signal generation unit generates the photoelectric composite cable temperature monitoring signal according to the control instruction data. The modulation and demodulation unit is also used for modulating the Stokes scattered light and the anti-Stokes scattered light data output by the monitoring signal receiving unit into optical communication data and sending the optical communication data to the control unit for processing.

Further, as shown in fig. 3, the monitoring signal receiving unit includes a light splitting unit for separating stokes scattered light and anti-stokes scattered light from the optical signal of the back-scattered signal, and a thermometry data processing unit including a second photoelectric conversion unit for converting the stokes scattered light and the anti-stokes scattered light into electric signals, respectively, a second signal amplifying unit for amplifying the stokes scattered light and the anti-stokes scattered light, and an analog-to-digital conversion unit for analog-digital converting the amplified stokes scattered light and anti-stokes scattered light.

Specifically, the stokes scattered light and the anti-stokes scattered light are two optical signals generated by scattering the pulse signal sent by the monitoring signal generating unit in the optical fiber after frequency shift. In some embodiments of the present invention, the optical splitting unit is further configured to separate brillouin light and anti-brillouin light from the optical signal of the backscattered signal.

Further, as shown in fig. 4, the relay unit includes a third photoelectric conversion unit for converting a received optical signal into an electrical signal, a third signal amplification unit for amplifying the electrical signal, a second automatic gain control unit for automatically controlling an amplification factor of the third signal amplification unit according to an amplitude of the electrical signal, a second equalization unit for correcting a waveform of the electrical signal, a second pulse regeneration unit for recovering a pulse waveform of the electrical signal, and a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of a rear-stage photoelectric composite cable.

Specifically, the third photoelectric conversion unit is configured to convert an optical signal into an electrical signal, which may be a PIN photodiode or an APD avalanche photodiode, where the electrical signal is weak and has waveform distortion after the optical signal in the optical fiber is converted into the electrical signal by the third photoelectric conversion unit, and the electrical signal needs to be amplified by the third signal amplification unit, and the waveform of the electrical signal is recovered by the second equalization unit and the second pulse regeneration unit. In some embodiments of the present invention, the third signal amplifying unit includes a third pre-amplifying unit with low noise and high gain, and a third main amplifying unit for adjusting the electric signal to a target level amplitude. The second pulse regeneration unit comprises a second clock recovery unit and a second decision unit, the second clock recovery unit is used for processing the signals output by the second equalization unit to obtain corresponding clock signals, the second decision unit is used for processing the signals output by the second equalization unit according to the time signals, when the level of the signals output by the second equalization unit is greater than a given level threshold value, the signals are judged to be 1, otherwise, the signals are judged to be 0, and accordingly digital signals corresponding to optical signals transmitted in an optical cable of a front-section photoelectric composite cable are recovered.

As described above, the optical signal is attenuated under the influence of various factors in the optical cable, after the optical signal is transmitted for a certain distance, its signal intensity is smaller than the intensity just when the optical signal is transmitted, and the signal intensity of a part of the back-scattered signal, which is a scattered signal in the optical fiber, is much smaller than the intensity just when the optical signal is transmitted, when the segment of the optical cable is too long, the back-scattered signal at the far end will be too weak to be detected, so in the technical scheme of the embodiment, a minimum optical power threshold value of the back-scattered signal is configured, and the setting interval distance of the relay temperature measurement module in the optical-electrical composite cable is configured based on the minimum optical power threshold value.

As shown in fig. 5, a third aspect of the present invention proposes a remote monitoring system for a photoelectric composite cable, including a control unit, a communication unit, and a power supply unit connected at a start end of a first-stage photoelectric composite cable, a relay unit connected between any two-stage photoelectric composite cables, and further including a monitoring signal generating unit, a monitoring signal receiving unit, and a first coupling unit connected at the start end of each-stage photoelectric composite cable, the monitoring signal generating unit, the monitoring signal receiving unit, and the relay unit being connected to a cable of the photoelectric composite cable so as to supply power through the cable, one end of the relay unit being connected to an end of an optical cable of a preceding-stage photoelectric composite cable, and the other end being connected to a start end of an optical cable of a subsequent-stage photoelectric composite cable through the first coupling unit, the monitoring signal generating unit is used for sending a photoelectric composite cable temperature monitoring signal to the optical cable of the rear photoelectric composite cable, the monitoring signal receiving unit is used for receiving a back scattering signal of the photoelectric composite cable temperature monitoring signal from the optical cable of the rear photoelectric composite cable, and the relay unit is used for compensating optical signal attenuation in the optical cable of the front photoelectric composite cable and continuously transmitting the compensated optical signal through the optical cable of the rear photoelectric composite cable.

The remote monitoring system of the photoelectric composite cable is particularly applied to a long-distance wired communication scene, and particularly applied to a wired communication scene using the photoelectric composite cable with a plurality of segments for communication transmission. In the technical scheme of the invention, the photoelectric composite cable comprises a plurality of segments, each segment of photoelectric composite cable comprises an optical cable and a cable which are wrapped by insulating materials, and as the optical signals in the optical cable are attenuated due to the influence of various factors in the long-distance transmission process, common causes of the attenuation of the optical signals in the optical cable comprise optical fiber absorption loss, optical fiber scattering loss, optical fiber bending loss and the like, each two adjacent segments of the photoelectric composite cable are connected through a relay unit so as to realize compensation of the attenuation of the optical signals of the optical cable in the photoelectric composite cable.

Specifically, the back scattering signal data is digital signal data obtained by performing light splitting, amplification and analog-to-digital conversion on the back scattering signal. In other embodiments of the present invention, the remote monitoring system for a photoelectric composite cable further includes a control unit, a communication unit, and a second coupling unit, where the control unit is connected to the monitoring signal generating unit and the monitoring signal receiving unit, and is configured to send a temperature measurement control instruction to the monitoring signal generating unit, and process the backscattered signal data output by the monitoring signal receiving unit to obtain temperature distribution data of an optical cable of a rear-section photoelectric composite cable, the communication unit is connected to the relay unit through the second coupling unit and is connected to an optical cable of a front-section photoelectric composite cable, and the communication unit, the monitoring signal generating unit, the monitoring signal receiving unit, and the relay unit are connected to an optical cable of a rear-section photoelectric composite cable through the first coupling unit, and the control unit sends the temperature distribution data to a remote monitoring device through the communication unit.

In some other embodiments of the present invention, the monitoring signal generating unit includes only the infrared laser generating unit, and the remote monitoring system of the optical-electrical composite cable further includes a modulation and demodulation unit disposed between any two sections of the optical-electrical composite cable for modulating and demodulating an optical signal in an optical cable of the optical-electrical composite cable, the modulation and demodulation unit including a first photoelectric conversion unit for converting a received optical signal into an electrical signal, a first signal amplification unit for amplifying the electrical signal, a first automatic gain control unit for automatically controlling an amplification factor of the first signal amplification unit according to an amplitude of the electrical signal, a first equalization unit for correcting a waveform of the electrical signal, a first pulse regeneration unit for recovering a pulse waveform of the electrical signal, a signal demodulation unit for recovering the electrical signal into original data, and a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of the optical-electrical composite cable. The modulation and demodulation unit is used for receiving optical communication data from the optical cable to analyze and obtain the control instruction data, so that the monitoring signal generation unit generates the photoelectric composite cable temperature monitoring signal according to the control instruction data. The modulation and demodulation unit is also used for modulating the Stokes scattered light and the anti-Stokes scattered light data output by the monitoring signal receiving unit into optical communication data and sending the optical communication data to the control unit for processing.

In some other embodiments of the present invention, the monitoring signal receiving unit includes only the light splitting unit, and the remote monitoring system of the optical-electrical composite cable further includes a modulation and demodulation unit disposed between any two sections of the optical-electrical composite cable for modulating and demodulating an optical signal in an optical cable of the optical-electrical composite cable, where the modulation and demodulation unit includes a second photoelectric conversion unit for converting stokes scattered light and anti-stokes scattered light into electrical signals, a second signal amplification unit for amplifying the stokes scattered light and the anti-stokes scattered light, an analog-to-digital conversion unit for analog-to-digital converting the amplified stokes scattered light and anti-stokes scattered light, and a signal modulation unit for modulating the electrical signals into optical signals to be transmitted into the optical cable of the optical-electrical composite cable.

Further, the remote monitoring system of the photoelectric composite cable further comprises a background server for running a remote monitoring service program of the photoelectric composite cable, the communication unit comprises an internet communication unit, the internet communication unit can be a wired communication unit, a cellular wireless communication unit or an internet of things communication unit, and the control unit is connected with the background server through the internet communication unit and sends the temperature distribution data of the photoelectric composite cable to the background server, so that the remote monitoring service program of the photoelectric composite cable can display or analyze the temperature distribution data of the photoelectric composite cable.

Further, in the remote monitoring system for a photoelectric composite cable, the relay unit, the monitoring signal generating unit, and the monitoring signal receiving unit are set in the photoelectric composite cable at a preset spacing distance DL, where the spacing distance DL satisfiesWherein P is _emit The optical power of the infrared laser pulse signal emitted by the infrared laser generating unit is P ₀ For a predetermined minimum of backscatter signalAnd the optical power threshold value alpha is the attenuation coefficient of the optical cable in the photoelectric composite cable.

As described above, the optical signal is attenuated by various factors in the optical cable, after the optical signal is transmitted over a certain distance, its signal strength is smaller than the strength just before transmission, and the signal strength of a part of the back-scattered signal, which is a scattered signal in the optical fiber, is much smaller than the strength just before transmission, and when the segment of the optical cable is too long, the back-scattered signal at the far end will be too weak to be detected, so in the technical solution of the above embodiment, a minimum optical power threshold of the back-scattered signal is configured, and the setting interval distance of the relay unit, the monitoring signal generating unit, and the monitoring signal receiving unit in the optical-electrical composite cable is configured based on the minimum optical power threshold.

As shown in fig. 6, a fourth aspect of the present invention proposes a remote monitoring method applied to the remote monitoring system of the optical-electrical composite cable according to the third aspect of the present invention, the remote monitoring method comprising:

Specifically, the starting end of each section of the photoelectric composite cable is provided with a monitoring signal generating unit and a monitoring signal receiving unit, the monitoring signal generating unit is connected with the starting end of the optical cable of the rear section of the photoelectric composite cable through a first coupling unit, the monitoring signal generating unit is connected with the tail end of the optical cable of the front section of the photoelectric composite cable through a second coupling unit, and the control unit is in communication connection with the monitoring signal generating unit and the monitoring signal receiving unit through the optical cable of the photoelectric composite cable so as to realize remote monitoring of each section of the photoelectric composite cable.

The control signal receiving unit comprises a first photoelectric conversion unit for converting a received optical signal into an electric signal, a first signal amplifying unit for amplifying the electric signal, a first automatic gain control unit for automatically controlling the amplifying multiple of the first signal amplifying unit according to the amplitude of the electric signal, a first equalizing unit for correcting the waveform of the electric signal, a first pulse regenerating unit for recovering the pulse waveform of the electric signal and a signal demodulating unit for recovering the electric signal into original data, wherein the control instruction data is obtained by analyzing the first optical communication data, specifically, the optical signal of the first optical communication data is converted into an analog electric signal, and the analog electric signal is amplified and waveform repaired to obtain the data content of the first optical communication data.

The infrared laser generating unit writes the sending time of the infrared laser pulse signal into the data of the infrared laser pulse signal as one of the coding contents of the infrared laser pulse signal, so that the second optical communication data also carries the signal sending time information of the infrared laser pulse signal, and the control unit can calculate the position of the photoelectric composite cable corresponding to the back scattering signal according to the signal sending time information of the infrared laser pulse signal and the time information of the corresponding back scattering signal received by the monitoring signal receiving unit, thereby correlating the calculated temperature information with the position of the photoelectric composite cable to obtain the temperature distribution data of the photoelectric composite cable.

acquiring a preset temperature distribution sampling distance SL;

where c is the speed of light.

Specifically, the monitoring signal receiving unit further includes a high-precision clock unit, the high-precision clock unit is used for timing to trigger the monitoring signal receiving unit to perform signal sampling operation, the temperature distribution sampling distance SL is configured according to the precision of the high-precision clock unit, and in the precision range of the high-precision clock unit, the smaller the temperature distribution sampling distance SL is, the better the temperature distribution sampling distance SL is.

amplifying the analog electrical signal by a second signal amplifying unit;

Specifically, the thermometry data processing unit comprises a second photoelectric conversion unit for respectively converting stokes scattered light and anti-stokes scattered light into electric signals, a second signal amplification unit for amplifying the stokes scattered light and the anti-stokes scattered light, and an analog-to-digital conversion unit for performing analog-to-digital conversion on the amplified stokes scattered light and anti-stokes scattered light.

The monitoring signal receiving unit is connected to an optical cable in the photoelectric composite cable through the second coupling unit to transmit the second optical communication data to the control unit.

Specifically, the same infrared laser pulse signal returns to the monitoring signal receiving unit at different times, and the detected target position corresponding to the back scattering signal can be obtained by dividing the time difference between signal transmission and reception by the speed of light.

According to the raman scattering principle, the temperature of the target position is positively correlated with the frequency shift of the infrared laser pulse signal in the optical cable, inversely correlated with the signal intensity ratio of the anti-stokes scattered light and the stokes scattered light, and the factor influencing the frequency shift of the back scattered signal is mainly raman scattering characteristics of the optical cable itself, so that the frequency shift can be regarded as a fixed value when the wavelength of the infrared laser pulse signal is a specific value, and the temperature of the target position of the optical cable can be calculated by measuring the signal intensities of the anti-stokes scattered light and the stokes scattered light.

It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims

1. The remote monitoring system of the photoelectric composite cable is characterized by comprising a control unit, a communication unit and a power supply unit, wherein the control unit, the communication unit and the power supply unit are connected at the starting end of a first-section photoelectric composite cable, the relay unit is connected between any two sections of photoelectric composite cables, the remote monitoring system also comprises a monitoring signal generation unit, a monitoring signal receiving unit and a first coupling unit which are connected at the starting end of each section of photoelectric composite cable, the monitoring signal generation unit, the monitoring signal receiving unit and the cables of the relay unit are used for supplying power to the cables of the photoelectric composite cables through the cables, one end of the relay unit is connected with the tail end of the optical cable of a front-section photoelectric composite cable, the other end of the relay unit is connected with the starting end of the optical cable of a rear-section photoelectric composite cable through the first coupling unit, the monitoring signal generation unit and the monitoring signal receiving unit are connected with the starting end of the optical cable of the rear-section photoelectric composite cable through the first coupling unit, the communication unit is used for transmitting first optical communication data to the optical cable under the control of the control unit, the monitoring signal generation unit is used for transmitting temperature compensation signal to the optical cable of the rear-section photoelectric composite cable, the monitoring signal is continuously used for transmitting temperature compensation signal to the monitoring signal from the optical cable of the rear-section photoelectric composite cable through the optical cable, and the monitoring signal is continuously attenuated from the monitoring signal receiving optical cable of the rear-section of the optical composite cable through the optical cable.

2. The remote monitoring system of an optical-electrical composite cable according to claim 1, wherein the first optical communication data comprises control instruction data for controlling the monitoring signal generating unit to send an optical cable of the optical-electrical composite cable of the rear section to a temperature monitoring signal of the optical-electrical composite cable, the remote monitoring system further comprises a second coupling unit connected before the monitoring signal generating unit and the monitoring signal receiving unit, the monitoring signal generating unit receives the first optical communication data through the second coupling unit to analyze and obtain the control instruction data, the monitoring signal receiving unit sends second optical communication data to the control unit through the second coupling unit, the second optical communication data comprises back scattering signal data of the optical cable of the optical-electrical composite cable of the rear section, and one end of the relay unit is connected with the end of the optical cable of the optical-electrical composite cable of the front section specifically, the relay unit is connected with the end of the optical cable of the optical-electrical composite cable of the front section through the second coupling unit.

3. The remote monitoring system of an optical-electrical composite cable according to claim 2, wherein the monitoring signal generating unit includes an infrared laser generating unit for generating an infrared laser pulse signal and a control signal receiving unit including a first photoelectric conversion unit for converting a received optical signal into an electrical signal, a first signal amplifying unit for amplifying the electrical signal, a first automatic gain control unit for automatically controlling an amplification factor of the first signal amplifying unit according to an amplitude of the electrical signal, a first equalizing unit for correcting a waveform of the electrical signal, a first pulse regenerating unit for recovering a pulse waveform of the electrical signal, and a signal demodulating unit for recovering the electrical signal into original data.

4. The remote monitoring system of an optical-electrical composite cable according to claim 2, wherein the monitoring signal receiving unit includes a spectroscopic unit for separating stokes scattered light and anti-stokes scattered light from the optical signal of the back-scattered signal, and a thermometry data processing unit including a second photoelectric conversion unit for converting the stokes scattered light and the anti-stokes scattered light into electrical signals, respectively, a second signal amplification unit for amplifying the stokes scattered light and the anti-stokes scattered light, and an analog-to-digital conversion unit for analog-digital converting the amplified stokes scattered light and anti-stokes scattered light.

5. The remote monitoring system of an optical-electrical composite cable according to claim 2, wherein the relay unit includes a third optical-electrical conversion unit for converting a received optical signal into an electrical signal, a third signal amplification unit for amplifying the electrical signal, a second automatic gain control unit for automatically controlling an amplification factor of the third signal amplification unit according to an amplitude of the electrical signal, a second equalization unit for correcting a waveform of the electrical signal, a second pulse regeneration unit for recovering a pulse waveform of the electrical signal, a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of a rear-stage optical-electrical composite cable, and a signal modulation unit for modulating the electrical signal into an optical signal to be transmitted into an optical cable of an optical-electrical composite cable.

6. The remote monitoring system of an optical-electrical composite cable according to claim 1, wherein the relay unit, the monitoring signal generating unit, the monitoring signal receiving unit are provided in the optical-electrical composite cable with a preset spacing distance DL, wherein the spacing distance DL satisfiesWherein P is _emit The optical power of the infrared laser pulse signal emitted by the infrared laser generating unit is P ₀ And alpha is the attenuation coefficient of the optical cable in the photoelectric composite cable, and is a preset minimum optical power threshold value of the back scattering signal.

7. A method for remotely monitoring an optical-electrical composite cable, comprising:

8. The method for remote monitoring of an optical-electrical composite cable according to claim 7, wherein the monitoring signal receiving unit is connected to the monitoring signal generating unit, and the step of detecting the optical signal of the backscattered signal in the optical cable of the rear-section optical-electrical composite cable by the monitoring signal receiving unit through the first coupling unit specifically comprises:

acquiring a preset temperature distribution sampling distance SL;

where c is the speed of light.

9. The method for remote monitoring of an optical-electrical composite cable according to claim 7, wherein the step of generating, by the thermometry data processing unit, second optical communication data corresponding to the stokes scattered light and the anti-stokes scattered light specifically comprises:

amplifying the analog electrical signal by a second signal amplifying unit;

10. The method for remotely monitoring a photoelectric composite cable according to claim 9, wherein the step of the control unit obtaining the temperature distribution data of the rear-section photoelectric composite cable by analyzing the second optical communication data specifically includes: