CN115900998A - Environmental temperature monitoring system and method - Google Patents
Environmental temperature monitoring system and method Download PDFInfo
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- CN115900998A CN115900998A CN202211414654.XA CN202211414654A CN115900998A CN 115900998 A CN115900998 A CN 115900998A CN 202211414654 A CN202211414654 A CN 202211414654A CN 115900998 A CN115900998 A CN 115900998A
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Abstract
The invention provides an environmental temperature monitoring system and a method, wherein the system comprises: the optical fiber is used for being laid in the cable trench; the temperature measurement host is connected with the optical fiber to emit laser pulses to the optical fiber, detect the intensity and time of Raman scattering light and demodulate the Raman scattering light to obtain the temperature field distribution on the whole section of optical fiber; the monitoring host is connected with the temperature measuring host; the mobile terminal is connected with the monitoring host so as to receive monitoring analysis information and carry out risk disposal in time; the sound and light alarm device is connected with the monitoring host and is used for carrying out risk early warning on the staff in time in a sound and light mode; the invention can monitor the temperature change in the cable trench in all weather, can position risk points and automatically inform maintenance personnel to deal with the risk points in time, prevents fire, reduces financial loss of manpower and material resources, and improves the reliability of power supply.
Description
Technical Field
The invention relates to the field of pipeline and line temperature monitoring, in particular to an environmental temperature monitoring system and method.
Background
With the continuous acceleration of urban transformation pace, the electric power buried cable and the channel are developed in the direction of high density and large length, and the occupied proportion of the cable in an urban power grid is larger and larger. In recent years, city construction is rapidly expanded, various engineering projects are comprehensively developed, meanwhile, the requirement of social high-quality service is higher and higher, external operation environments such as public opinion supervision, government supervision and the like are more and more severe, the requirement of power supply reliability of an urban power grid is higher and higher, and the situation of fire prevention, disaster prevention and real-time early warning and protection of power ground cables and channels is more and more severe.
Meanwhile, the power pipeline is shallowly buried at two sides of the urban road, has a plurality of points, wide area and long line length, and is very easy to generate spontaneous combustion fire after being exposed outdoors for a long time. The traditional cable trench fire monitoring method is limited, does not have a real-time monitoring function, is low in intelligence degree, and can cause loss of a large amount of manpower, material resources and financial resources once a fire disaster occurs.
Disclosure of Invention
In order to solve the problems, the invention provides an environmental temperature monitoring system which can monitor the temperature change in a cable trench all weather, can locate risk points and automatically inform maintenance personnel to dispose timely, prevent fire, reduce financial loss of manpower and material resources and improve power supply reliability.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an ambient temperature monitoring system comprising:
the optical fiber is laid in the cable trench to detect the temperature of each position of the cable trench based on optical time domain reflection and Raman scattering principles;
the temperature measurement host is connected with the optical fiber to emit laser pulses to the optical fiber, detect the intensity and time of Raman scattering light and demodulate the Raman scattering light to obtain the temperature field distribution on the whole section of optical fiber;
the monitoring host is connected with the temperature measurement host and used for receiving the measurement data of the temperature measurement host, timely mastering the temperature state fed back by the optical fiber, centralizedly managing temperature abnormity alarm information, visually displaying the current temperature distribution curve and realizing statistics and analysis of alarm;
the mobile terminal is connected with the monitoring host so as to receive monitoring analysis information and carry out risk disposal in time;
and the sound and light alarm device is connected with the monitoring host and is used for timely carrying out risk early warning on the staff in a sound and light mode.
Furthermore, the temperature measurement host is connected with the optical fiber to measure the temperature field distribution of the optical fiber in a multimode manner.
Furthermore, the temperature measurement host is connected with the optical fiber to measure the temperature field distribution of the optical fiber in a single mode.
Further, the optical fiber comprises a fiber core, a cladding and a protective layer; the cladding layer wraps the fiber core; the protective layer wraps the cladding; the refractive index of the cladding is different from that of the fiber core, so that an optical signal is enclosed in the fiber core for transmission and the fiber core is protected; the protective layer is used for further protecting the fiber core.
Further, the fiber core is a glass fiber core.
Furthermore, a laser source, an acquisition module, a signal detection module and an information processing module are arranged in the temperature measurement host; the information processing module is respectively connected with the laser source, the acquisition module and the signal detection module; the laser source is used for emitting high-quality laser pulses; the acquisition module is used for acquiring the Raman scattering light at a high speed to ensure that the information is not distorted; the signal detection module is used for detecting weak Raman scattering optical signals; the information processing module is used for processing the acquired information at a high speed.
Furthermore, the monitoring host is interconnected with a PC, a PLC, a fire alarm system or an SCADA control device through RS232, the Internet, a relay or an LED, so as to output signals in a segmented and graded manner according to different alarm areas, thereby adapting to different dangerous case alarm requirements.
An environmental temperature monitoring method is applied to the environmental temperature monitoring system and comprises the following steps:
laying the optical fiber in an area needing to be detected or connecting the temperature measurement host with one optical fiber in the communication optical cable laid in the existing area;
starting up to initialize the system;
setting monitoring parameters and alarm parameters;
and entering a real-time monitoring state of the temperature all day.
Further, the setting of the monitoring parameters and the alarm parameters comprises the following steps:
a multi-level constant temperature value alarm function is arranged in the monitoring host and is used for sending out alarms of different levels according to temperatures of different levels;
the monitoring host is provided with a high-temperature point temperature rise rate monitoring function so as to alarm at different levels for different temperature rise rates.
Further, the setting of the monitoring parameters and the alarm parameters further comprises the following steps: independent alarm limits are set for the temperature measurement values of different sections of the optical fiber in the monitoring host respectively so as to adapt to different temperature limit value areas through which the optical fiber passes, the whole-area measurement of one optical fiber is realized, and the laying cost is reduced.
The invention relates to the field of pipeline and line temperature monitoring, and provides an environmental temperature monitoring system and method, wherein the system comprises: the optical fiber is laid in the cable trench to detect the temperature of each position of the cable trench based on optical time domain reflection and Raman scattering principles; the temperature measurement host is connected with the optical fiber to emit laser pulses to the optical fiber, detect the intensity and time of Raman scattering light and demodulate the Raman scattering light to obtain the temperature field distribution on the whole section of optical fiber; the monitoring host is connected with the temperature measurement host and used for receiving the measurement data of the temperature measurement host, timely mastering the temperature state fed back by the optical fiber, centralizedly managing temperature abnormity alarm information, visually displaying the current temperature distribution curve and realizing statistics and analysis of alarm; the mobile terminal is connected with the monitoring host so as to receive monitoring analysis information and carry out risk disposal in time; the acousto-optic alarm device is connected with the monitoring host and is used for timely carrying out risk early warning on the staff in an acousto-optic mode; the invention can monitor the temperature change in the cable trench all weather, can position risk points and automatically inform maintenance personnel to deal with the risk points in time, prevents fire, reduces financial loss of manpower and material resources, and improves the reliability of power supply.
Drawings
FIG. 1 is a schematic diagram of an ambient temperature monitoring system;
FIG. 2 is a schematic view of a linear arrangement of optical fibers;
FIG. 3 is a schematic diagram of a wound lay of optical fibers;
fig. 4 is a schematic structural diagram of the temperature measurement host.
Description of reference numerals: 1-monitoring host, 2-mobile terminal, 3-acousto-optic alarm device, 4-temperature measuring host, 5-optical fiber and 6-cable.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
Fig. 1 is a structural diagram of an ambient temperature monitoring system, which includes:
the optical fiber is laid in the cable trench to detect the temperature of each position of the cable trench based on optical time domain reflection and Raman scattering principles;
the temperature measurement host is connected with the optical fiber to emit laser pulses to the optical fiber, detect the intensity and time of Raman scattering light and demodulate the Raman scattering light to obtain the temperature field distribution on the whole section of optical fiber;
the monitoring host is connected with the temperature measurement host and used for receiving the measurement data of the temperature measurement host, timely mastering the temperature state fed back by the optical fiber, centralizedly managing temperature abnormity alarm information, visually displaying the current temperature distribution curve and realizing statistics and analysis of alarm;
the mobile terminal is connected with the monitoring host computer so as to receive monitoring analysis information and timely carry out risk disposal;
and the sound and light alarm device is connected with the monitoring host and is used for timely carrying out risk early warning on the staff in a sound and light mode.
In specific implementation, the temperature measurement host is connected with the optical fiber to measure the temperature field distribution of the optical fiber in a multimode manner.
In specific implementation, the temperature measurement host is connected with the optical fiber to measure the temperature field distribution of the optical fiber in a single mode. The existing common cable trench is not provided with a multimode optical cable, if the multimode optical cable is adopted for temperature measurement, the optical cable needs to be specially laid additionally, and the laying of the multimode optical cable is large in construction cost and construction difficulty and is not easy to realize. The single-mode optical fiber is used for signal transmission and temperature detection, and can realize propagation and sensing integration; by using different outer sheath materials, the monitoring system can adapt to various environments. The single-mode optical cable has expansibility, namely can be used for communication, and can also be used for pipeline leakage temperature measurement or high-temperature fire prevention, pipeline pressure measurement, pipeline damage prevention, video monitoring and the like. However, the multimode optical cable cannot be used for communication, if the multimode optical cable is laid only for leakage temperature measurement or high-temperature fire prevention of the power and oil and gas transmission pipeline, secondary construction is often needed later, and the single-mode optical cable needs to be laid again for communication or monitoring in other aspects, so that the manufacturing cost is quite high. Single mode fiber (singlemode fiber): the central glass core is very thin (core diameter is typically 9 or 10 μm) and can only transmit one mode of light. Therefore, the intermodal dispersion is very small, and the fiber is suitable for remote communication, but material dispersion and waveguide dispersion exist, so that the single-mode fiber has higher requirements on the spectral width and stability of a light source, namely the spectral width is narrow and the stability is good, and therefore a laser source in a temperature measurement host adopts a high-performance light source. Multimode fibers are used in small capacity, short distance systems; single mode fibers are used for trunk, large capacity, long distance systems. The distance loss for single mode signals is smaller than for multiple modes. At the first 3000 feet of distance, a multimode fiber may lose 50% of its LED optical signal strength, while a single mode only loses 6.25% of its laser signal at the same distance.
In a specific implementation, the optical fiber comprises a fiber core, a cladding and a protective layer; the cladding layer wraps the fiber core; the protective layer wraps the cladding; the refractive index of the cladding is different from that of the fiber core, so that an optical signal is enclosed in the fiber core for transmission and the fiber core is protected; the protective layer is used for further protecting the fiber core.
In a specific implementation, the fiber core is a glass fiber core.
In specific implementation, the temperature measurement host is provided with a laser source, an acquisition module, a signal detection module and an information processing module; the information processing module is respectively connected with the laser source, the acquisition module and the signal detection module; the laser source is used for emitting high-quality laser pulses; the acquisition module is used for acquiring the Raman scattering light at a high speed to ensure that the information is not distorted; the signal detection module is used for detecting weak Raman scattering optical signals; the information processing module is used for processing the acquired information at a high speed.
In specific implementation, the monitoring host is interconnected with a PC, a PLC, a fire alarm system or an SCADA control device through RS232, the Internet, a relay or an LED, so as to output signals in a segmented and graded manner according to different alarm areas, and adapt to different dangerous case alarm requirements.
In specific implementation, as shown in fig. 2, the optical fiber can be laid on the cable in a direct fixing manner, which has the advantages of low laying cost and convenient replacement and maintenance.
In specific implementation, the optical fiber can be fixed on the cable in a winding mode, so that the temperature measurement can be carried out in multiple directions, the detection accuracy is high, compared with the method of laying a plurality of optical fibers to improve the accuracy, the laying mode is low in difficulty and cost, and the system is simple in structure.
The above two modes need to adopt a proper mode when seeing the occasion.
An environmental temperature monitoring method is applied to the environmental temperature monitoring system and comprises the following steps:
laying the optical fiber in an area needing to be detected or connecting the temperature measurement host with one optical fiber in the communication optical cable laid in the existing area;
starting up to initialize the system;
setting monitoring parameters and alarm parameters;
and entering a real-time monitoring state of the temperature all day.
In specific implementation, the monitoring parameter and alarm parameter setting comprises the following steps:
a multi-level constant temperature value alarm function is arranged in the monitoring host and is used for sending out alarms of different levels according to temperatures of different levels;
the monitoring host is provided with a high-temperature point temperature rise rate monitoring function so as to alarm at different levels for different temperature rise rates.
In specific implementation, the setting of the monitoring parameters and the alarm parameters further comprises the following steps: independent alarm limits are set for the temperature measurement values of different sections of the optical fiber in the monitoring host respectively so as to adapt to different temperature limit value areas through which the optical fiber passes, the whole-area measurement of one optical fiber is realized, and the laying cost is reduced.
The laser source in the temperature measurement host can emit light pulses ten thousand times per second, the information processing module outputs the average value of the sampling temperature to the display system, errors are basically eliminated, the temperature precision reaches +/-1 ℃, and the positioning precision is 1 meter.
In addition, the system can also have a self-checking function, can monitor the running condition in real time and alarm fault points; the system can perform partition management, can display the temperature of a detection partition, and can position according to the partition; the system can also accurately locate a fault place, provide map information and GPS coordinates, repair pipeline faults, shorten time and improve economic benefits for customers; the alarm can be carried out according to the temperature rising rate, and the alarm rate value can be set; the alarm equipment is provided with a manual reset button, and after the alarm occurs, the alarm can be cancelled only after the reset is confirmed, so that the notification is ensured to be in place.
Example two
In a specific implementation, as shown in fig. 4, the present embodiment is different from the first embodiment in that a laser, a coupler, a wavelength division multiplexer, a photodetector, a microprocessor, and a driver are disposed in the temperature measurement host, the laser is connected to the coupler, the coupler is connected to the wavelength division multiplexer, the wavelength division multiplexer is connected to the photodetector, the photodetector is connected to the microprocessor, the microprocessor is connected to the driver, and the driver is connected to the laser. The laser emits high-quality laser pulses into the optical fiber through the coupler; laser generates Raman scattering in the optical fiber, passes through the coupler and the wavelength division multiplexer, is detected and collected by the photoelectric detector, and then enters the microprocessor for data processing. The microprocessor further controls the laser to send laser pulses through the driver according to the collected information of the light so as to achieve a better detection effect.
The anti-stokes light of spontaneous raman scattering in an optical fiber is closely related to temperature. And the temperature sensitive coefficient is 8 per mill/DEG C at normal temperature (T = 300K). The distributed optical fiber temperature measurement of the ratio of anti-Stokes to Stokes is adopted, the result eliminates the influence of factors such as light source fluctuation, optical fiber bending and the like, and is only related to the temperature field along the optical fiber, so that the temperature measurement precision can be ensured for a long time. The long-distance, all-weather, 7-24-hour fire prevention and disaster prevention early warning protection for important places or facilities (such as electric underground cables and channels, IDC data centers and the like) is realized, and the early warning protection scene requirements of high-temperature spontaneous combustion caused by abnormal overload of the important places or facilities are met.
Is distributed
The DTS system is a distributed temperature measurement system, provides continuous dynamic monitoring signals, continuously distributes the measured temperature data continuously, and can display the temperature change of the monitored object at each point of 1 meter in real time.
Advancement of
The DTS optical fiber distributed temperature measurement system is the most effective means for on-line monitoring and is very mature and complete in technology;
the optical fiber is used for signal transmission and temperature detection, namely, the transmission and sensing are integrated;
by adopting different outer sheath materials, the DTS monitoring system can adapt to various environments;
various function settings are set by a host computer of the DTS system through programming by an engineer in a Windows environment through a PC.
The system can be calibrated by adopting software version above Windows2000 when the region length and the alarm point are set.
Accuracy of solid content
The temperature precision of the DTS system reaches +/-1 ℃, and the positioning precision is 1 meter; the laser emitting device in the system host can emit light pulses ten thousand times per second, and the average value of the sampling temperature is output to the display system, so that errors are basically eliminated.
Flexibility of solid
The DTS monitoring system provides a continuous dynamic monitoring signal, can set multistage constant temperature value alarm and can correct the alarm according to different environments;
in order to avoid false alarm, the temperature rise rate of the high-temperature point is monitored while the constant-temperature alarm monitoring is carried out, and corresponding alarm signal output is provided.
Each alarm zone can be programmed separately and designed according to the requirements of users, and the system can set different alarm control areas according to the environmental change.
Compatibility
The system can be interconnected with other control equipment such as a PC, a PLC, a fire alarm system, an SCADA and the like through output forms such as RS232, ethernet, a built-in relay, an LED and the like, can be networked with systems such as a fire alarm controller and the like in fire protection application, provides signals for sound-light alarm, and is accurate and complete in signal output. The optical fiber distributed temperature monitoring system can output signals in a segmented and graded mode according to different alarm areas so as to adapt to different requirements.
Safety of solid content
The optical cable distributed temperature monitoring system has a safety recording function;
remote diagnostics, which may be provided by a specialized engineer through a modem;
if the optical fiber is damaged, the DTS system can locate the damaged point in time and weld the damaged point through an optical fiber welding machine, which is very important for effectively implementing online monitoring; the detection optical cable is intrinsically safe and does not generate mutual electromagnetic interference with the electric conductor due to the adoption of an optical signal.
The invention relates to the field of pipeline and line temperature monitoring, and provides an environmental temperature monitoring system and method, wherein the system comprises: the optical fiber is laid in the cable trench to detect the temperature of each position of the cable trench based on optical time domain reflection and Raman scattering principles; the temperature measurement host is connected with the optical fiber to emit laser pulses to the optical fiber, detect the intensity and time of Raman scattering light and demodulate the Raman scattering light to obtain the temperature field distribution on the whole section of optical fiber; the monitoring host is connected with the temperature measurement host and used for receiving the measurement data of the temperature measurement host, timely mastering the temperature state fed back by the optical fiber, centralizedly managing temperature abnormity alarm information, visually displaying the current temperature distribution curve and realizing statistics and analysis of alarm; the mobile terminal is connected with the monitoring host computer so as to receive monitoring analysis information and timely carry out risk disposal; the acousto-optic alarm device is connected with the monitoring host and is used for timely carrying out risk early warning on the staff in an acousto-optic mode; the invention can monitor the temperature change in the cable trench all weather, can position risk points and automatically inform maintenance personnel to deal with the risk points in time, prevents fire, reduces financial loss of manpower and material resources, and improves the reliability of power supply.
In the description of the present invention, it is to be understood that the terms "intermediate", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (10)
1. An ambient temperature monitoring system, comprising:
the optical fiber is laid in the cable trench to detect the temperature of each position of the cable trench based on optical time domain reflection and Raman scattering principles;
the temperature measurement host is connected with the optical fiber to emit laser pulses to the optical fiber, detect the intensity and time of Raman scattering light and demodulate the Raman scattering light to obtain the temperature field distribution on the whole section of optical fiber;
the monitoring host is connected with the temperature measurement host and used for receiving the measurement data of the temperature measurement host, timely mastering the temperature state fed back by the optical fiber, centralizedly managing temperature abnormity alarm information, and visually displaying the current temperature distribution curve to realize statistics and analysis of alarm;
the mobile terminal is connected with the monitoring host so as to receive monitoring analysis information and carry out risk disposal in time;
and the sound-light alarm device is connected with the monitoring host and is used for timely carrying out risk early warning on the staff in a sound-light mode.
2. The ambient temperature monitoring system according to claim 1, wherein the thermometric host is connected to the optical fiber to measure the temperature field distribution of the optical fiber in a multimode manner.
3. The ambient temperature monitoring system according to claim 1, wherein the temperature measurement host is connected to the optical fiber to measure the temperature field distribution of the optical fiber in a single mode.
4. The ambient temperature monitoring system of claim 1, wherein the optical fiber comprises a core, a cladding, and a protective layer; the cladding layer wraps the fiber core; the protective layer wraps the cladding; the refractive index of the cladding is different from that of the fiber core, so that an optical signal is enclosed in the fiber core for transmission and the function of protecting the fiber core is realized; the protective layer is used for further protecting the fiber core.
5. The ambient temperature monitoring system of claim 4, wherein the fiber core is a glass fiber core.
6. The ambient temperature monitoring system according to claim 1, wherein the temperature measuring host is provided with a laser source, an acquisition module, a signal detection module and an information processing module; the information processing module is respectively connected with the laser source, the acquisition module and the signal detection module; the laser source is used for emitting high-quality laser pulses; the acquisition module is used for acquiring the Raman scattering light at a high speed to ensure that the information is not distorted; the signal detection module is used for detecting weak Raman scattering optical signals; the information processing module is used for processing the acquired information at a high speed.
7. The ambient temperature monitoring system according to any one of claims 1 to 6, wherein the monitoring host is interconnected with a PC, PLC, fire alarm system or SCADA control device through RS232, internet, relay or LED to output signals in sections and stages according to different alarm areas to adapt to different dangerous case alarm needs.
8. An ambient temperature monitoring method applied to the ambient temperature monitoring system according to any one of claims 1 to 7, comprising the steps of:
laying the optical fiber in an area needing to be detected or connecting the temperature measurement host with one optical fiber in the communication optical cable laid in the existing area;
starting up to initialize the system;
setting monitoring parameters and alarm parameters;
and entering a real-time monitoring state of the temperature all day.
9. The method for monitoring the ambient temperature according to claim 8, wherein the step of setting the monitoring parameters and the alarm parameters comprises the following steps:
a multi-level constant temperature value alarm function is arranged in the monitoring host and is used for sending out alarms of different levels according to temperatures of different levels;
the monitoring host is provided with a high-temperature point temperature rise rate monitoring function so as to alarm at different levels for different temperature rise rates.
10. The method for monitoring the ambient temperature according to claim 9, wherein the step of setting the monitoring parameters and the alarm parameters further comprises the following steps: independent alarm limits are set for the temperature measurement values of different sections of the optical fiber in the monitoring host respectively so as to adapt to different temperature limit value areas through which the optical fiber passes, the whole-area measurement of one optical fiber is realized, and the laying cost is reduced.
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