CN211147738U - Distributed optical fiber cave depot fracture water monitoring and early warning system - Google Patents
Distributed optical fiber cave depot fracture water monitoring and early warning system Download PDFInfo
- Publication number
- CN211147738U CN211147738U CN201922250638.1U CN201922250638U CN211147738U CN 211147738 U CN211147738 U CN 211147738U CN 201922250638 U CN201922250638 U CN 201922250638U CN 211147738 U CN211147738 U CN 211147738U
- Authority
- CN
- China
- Prior art keywords
- water
- optical fiber
- cave depot
- monitoring
- early warning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a distributed fiber cave depot fissure water monitoring and early warning system, which comprises a signal generator, an acousto-optic modulator, an EDFA amplifier, an echo EDFA amplifier, a circulator, optical fibers, a photoelectric detector and monitoring equipment, wherein the signal generator outputs light waves outwards; the acousto-optic modulator and the EDFA sequentially modulate and amplify the light waves of the signal generator; the circulator unidirectionally transmits the modulated and amplified light wave signals into optical fibers laid along the side wall of the cave depot, and unidirectionally transmits backward scattered light generated in the process of transmitting light waves by the optical fibers into an echo EDFA amplifier; and the photoelectric detector receives water temperature, water quantity and stress strain signals carried in the optical fiber scattering light amplified by the echo EDFA amplifier. Through the utility model discloses, there are drawback and the problem of local limitation that is showing in the conventional geophysical prospecting technique that solves prior art existence surveys the occurrence condition of cave depot crack water.
Description
Technical Field
The utility model relates to a cave depot crack water monitoring technology field, concretely relates to distributing type optic fibre cave depot crack water monitoring and early warning system.
Background
The fracture water in the cave depot has the characteristics of burying, uneven distribution, complex occurrence and motion rules and the like, reduces and even disintegrates the strength of the rock body under the action of soaking and softening the rock body, induces the occurrence of engineering accidents such as water burst, collapse and the like, and poses serious threats to the construction safety in the cave depot and the operation management after construction. In addition, the cave depot fissure water is used as a water source inside a cave depot mountain body, is often wasted and discharged in the cave depot engineering construction process, cannot be collected and utilized, and is a great loss for the cave depot engineering with scarce water resources, so that a monitoring means is required to be available for detecting the cave depot fissure water in real time and carrying out relevant collection, storage and comprehensive utilization.
At present, the occurrence condition of the fracture water of the cave depot is mainly detected by adopting a geophysical prospecting technology, and the method mainly comprises the following steps: electric method, radioactive measurement method, ground nuclear magnetic resonance sounding method and ground geophysical prospecting comprehensive information interpretation method.
Electric method: (1) resistivity method: the method has the advantages of simple field investigation, low cost, effective detection on the aquifer, but slow detection speed. Accurate localization of resistivity anomalies is a technique for accurately determining background resistivity values in deviated zones, which can be used for bedrock fracture water detection. (2) An electromagnetic method: the method is characterized in that a plurality of types of faults are scanned by using a very low frequency method, electromagnetic radiation in a frequency range of 15-25Hz generated by a military radio transmitter is used as a source, and the fault can be used as an indirect indicator of a movement path of underground water and a quality index of a rock mass in bedrock. (3) And (3) vertical electrical sounding method: the method can not only divide the underground continuity region, but also research the geophysical prospecting for a common and economic underground water exploration tool. And establishing and calibrating an underground water flowing model based on historical observation data, and evaluating underground water exploitation potential and the influence of future exploitation on a deep underground water system. (4) A natural potential method: a quick and cheap exploration tool is composed of automatic sorting of earth surface potential distribution. And (3) a model connecting the SP signals with the underground water level shape adopts an optimization criterion based on a single method to evaluate and invert the SP data according to the water level.
Radioactivity measurement method: in the early 70 s of the 20 th century, China began to seek for underground water sources by adopting a natural radioactive measurement method, and indirectly sought for bedrock underground water related to fracture and fissure through seeking for a water storage structure.
Ground nuclear magnetic resonance sounding method: the Nuclear Magnetic Resonance (NMR) technique was used for water exploration in Zhang Changda et al in 1965, and the technology was adopted in the Soviet Union before 1978. Later, france developed a new NMR water finder. In a test at northern one site in germany in 1999, the SNMR method was used to determine suitability for groundwater exploration and environmental investigation.
The ground geophysical prospecting comprehensive information interpretation method comprises the following steps: in the investigation of various geophysical prospecting methods, the interpretation method of the comprehensive information is used more. Shibalian et al explored the mode of investigating bedrock fracture water in granite areas by remote sensing and geophysical prospecting methods according to the bedrock fracture water investigation in granite areas in Hainan province. The Cao Wei Pong and the like construct a water exploration method series of remote sensing ground geophysical exploration by a remote sensing and ground geophysical exploration comprehensive information interpretation method, and discuss the necessity, rationality and possibility. The Quyi et al propose to establish remote sensing hydrogeology interpretation and assist in field ground investigation, field drilling groundwater flow velocity and direction test, field drilling water pressing test data analysis, hydrochemical analysis, environmental isotope test analysis and other means to explore. The remote sensing combined geophysical prospecting method is adopted to investigate the bedrock fracture water abroad, and the obvious progress is also achieved. The experience in India is the aviation picture plus very low frequency method, the aviation picture plus various electrical methods used in former Soviet Union are used to find bedrock fracture water, and the basic model of aviation picture plus very low frequency method is widely adopted in Africa and Latin America.
The methods have achieved unusual effects in the aspect of detection of cave depot fracture water, but have obvious disadvantages and limitations. The electrical method relies on a large amount of historical detection data accumulation, the detection speed is slow, the detection accuracy rate is low, the peak period of fracture water enrichment is easily missed, and the timely dredging and discharging of fracture water are not facilitated; radioactive elements harmful to human bodies can be generated by a radioactive measurement method, and in a closed cave depot space, the enrichment of the harmful radioactive elements can bring serious harm to the health of workers and is not beneficial to the detection of fracture water in the cave depot used by resident personnel; the ground nuclear magnetic resonance sounding method is mainly used for underground water exploration, and for fractured water on the side wall of a cave depot, no proper equipment installation plane exists, so that the fractured water in the side wall cannot be detected; the ground geophysical prospecting comprehensive information interpretation method has high detection precision, but has more detection means, is too complex and tedious, even needs on-site drilling and water pressing operation, and is not favorable for real-time monitoring of cave depot fracture water in long-term use.
SUMMERY OF THE UTILITY MODEL
The utility model provides a distributing type optic fibre hole storehouse crack water monitoring early warning system to solve the traditional geophysical prospecting technique that prior art exists and survey the existence of the drawback that is showing and the problem of local limitation to the occurrence condition of hole storehouse crack water.
For solving the technical problem, the utility model provides a distributing type optic fibre hole storehouse crack water monitoring early warning system acquires the best alarm time through optic fibre to the temperature, the water yield and the real-time continuous monitoring of stress field of monitoring point, helps eliminating the production potential safety hazard.
The utility model discloses a distributed fiber cave depot fissure water monitoring and early warning system, which comprises a signal generator, an acousto-optic modulator, an EDFA amplifier, an echo EDFA amplifier, a circulator, optical fibers, a photoelectric detector and monitoring equipment;
the signal generator outputs light waves outwards;
the acousto-optic modulator and the EDFA sequentially modulate and amplify the light waves of the signal generator;
the circulator unidirectionally transmits the modulated and amplified light wave signals into optical fibers laid along the side wall of the cave depot, and unidirectionally transmits backward scattered light generated in the process of transmitting light waves by the optical fibers into an echo EDFA amplifier;
the photoelectric detector receives water temperature, water quantity and stress strain signals carried in the optical fiber scattering light amplified by the echo EDFA amplifier;
the optical fiber terminal is connected with a water quantity sensor for collecting water quantity and water temperature information, an optical fiber grating displacement sensor for detecting the separation layer displacement of the top plate, a pressure sensor for detecting filling stress and a pressure distress sensor for sending a distress signal.
The monitoring equipment stores the water temperature, the water quantity and the stress-strain signal, and calculates according to the strength and the receiving time of the signal to obtain the time, the strength and the position of the signal.
Further, the signal generator adopts an ultra-narrow linewidth laser transmitter.
Furthermore, the water quantity signal, the water temperature signal and the stress strain signal are obtained through a water quantity sensor connected to an optical fiber terminal, when fracture water leakage occurs, part of light waves of the optical fiber are absorbed by the leaked fracture water, the rest light wave signals return to the photoelectric detector, the returned light wave signals are compared with an original light wave signal source, the readings of all the sensors are updated within a few seconds, and the monitoring equipment calculates and stores the water flow around each water quantity sensor according to the returned light wave signals.
Furthermore, the data acquisition and processing part adopts the technology of combining the distributed fiber bragg grating with the Mach Zehnder sensor, when accidents such as leakage and seepage of crevice water occur, certain mechanical disturbance can be caused on the surface of the sensor, so that the surface of the water quantity sensor can generate an 'impact' effect, interference signals can be generated by the Mach Zehnder interferometer of the fiber optic sensor in the process and are transmitted to the circulator through the sensing optical fiber, then the interference signals are transmitted to the input optical fiber of the photoelectric detector, the interference optical signals are converted into voltage signals through photoelectric conversion and are input to the computer, analog quantity is converted into digital quantity through the conversion of the high-speed high-precision AD converter, and then the size of the crevice water quantity can be calculated by adopting a corresponding mode identification algorithm.
Furthermore, the fiber bragg grating displacement sensor is provided with two probes, and the two probes are respectively arranged at the fixed measuring point and the reference measuring point through probe fixing pieces. The probe mount may be a length of rebar. Such as a 10cm long piece of rebar.
Furthermore, a distress button is arranged on the pressure distress sensor, and a cover plate used for preventing the distress button from being touched by mistake is arranged above the distress button.
The utility model discloses the beneficial effect who brings: the utility model discloses a temperature, water yield and stress field that ordinary optic fibre can distribute along optic fibre carry out real-time, continuous measurement, and the span of optic fibre can reach dozens of kilometers, has overcome traditional point type sensor and has been difficult to carry out the defect of all-round continuous monitoring to being surveyed the field.
Drawings
Fig. 1 is a schematic diagram of the distributed optical fiber cave depot fissure water monitoring and early warning system according to the embodiment of the present invention.
FIG. 2 is a schematic view of an embodiment of the present invention illustrating an installation structure of a fiber grating displacement sensor
FIG. 3 is a schematic diagram of the pressure distress sensor according to an embodiment of the present invention
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the utility model provides a distributing type optic fibre hole storehouse crack water monitoring early warning system acquires the best alarm time through optic fibre to the temperature, the water yield and the real-time continuous monitoring of stress field of monitoring point, helps eliminating the production potential safety hazard.
The utility model discloses a distributed fiber cave depot fissure water monitoring and early warning system, which comprises a signal generator, an acousto-optic modulator, an EDFA amplifier, an echo EDFA amplifier, a circulator, optical fibers, a photoelectric detector and monitoring equipment; the signal generator outputs light waves outwards; the acousto-optic modulator and the EDFA sequentially modulate and amplify the light waves of the signal generator; the circulator unidirectionally transmits the modulated and amplified light wave signals into optical fibers laid along the side wall of the cave depot, and unidirectionally transmits backward scattered light generated in the process of transmitting light waves by the optical fibers into an echo EDFA amplifier; the photoelectric detector receives water temperature, water quantity and stress strain signals carried in the optical fiber scattering light amplified by the echo EDFA amplifier; the monitoring equipment stores the water temperature, the water quantity and the stress-strain signal, and calculates according to the strength and the receiving time of the signal to obtain the time, the strength and the position of the signal.
The optical fiber terminal is connected with a water quantity sensor for collecting water quantity and water temperature information, an optical fiber grating displacement sensor for detecting the separation layer displacement of the top plate, a pressure sensor for detecting filling stress and a pressure distress sensor for sending a distress signal. The fiber bragg grating displacement sensor is provided with two probes, and the two probes are respectively arranged at a fixed measuring point and a reference measuring point through probe fixing pieces.
The pressure distress sensor is provided with a distress button, and a cover plate used for preventing the distress button from being touched by mistake is arranged above the distress button.
The signal generator adopts an ultra-narrow linewidth laser transmitter.
The water quantity signal, the water temperature signal and the stress strain signal are obtained through a water quantity sensor connected to an optical fiber terminal, when fracture water leakage occurs, part of light waves of the optical fiber are absorbed by the leaked fracture water, the rest light wave signals return to a photoelectric detector, the returned light wave signals are compared with an original light wave signal source, the readings of all the sensors are updated within a few seconds, and monitoring equipment calculates and stores water flow around each water quantity sensor according to the returned light wave signals.
The data acquisition and processing part adopts the technology of combining a distributed fiber grating with a Mach Zehnder sensor, when accidents such as leakage and seepage of fissure water occur, certain mechanical disturbance can be caused on the surface of the sensor, so that the surface of the water sensor can generate an 'impact' effect, the Mach Zehnder interferometer of the fiber sensor can generate interference signals in the process, the interference signals are transmitted to a circulator through sensing fibers and then transmitted to a photoelectric detector input fiber, the interference light signals are converted into voltage signals through photoelectric conversion and then input into a computer, analog quantity is converted into digital quantity through high-speed high-precision AD converter conversion, and then the size of the fissure water quantity can be calculated by adopting a corresponding mode identification algorithm.
Fiber Bragg Grating (FBG) technology has many significant advantages over conventional techniques in coal mine industry applications: firstly, optical fiber transmission is realized, and power supply is not needed on site; the second is complete electrical insulation, and is not affected by electromagnetic interference and nuclear radiation; the optical fiber sensor has high measurement precision and resolution, for example, the temperature measurement precision is 0.5 ℃, the temperature measurement fraction is 0.1 ℃, the displacement reaches 1 mm, and the stress reaches one microstrain; the speed is high, and data acquisition and transmission of up to ten thousand monitoring points can be completed within 1 second; thirdly, the paint can be applied to severe environments with high temperature, high humidity, coal dust, chemical erosion and the like for a long time; fourthly, absolute measurement is carried out, zero drift does not exist, and the light source attenuation and the line loss do not influence the measurement precision; fifthly, remote transmission can be realized, the distance can reach several kilometers to dozens of kilometers, and networking is easy; sixthly, the service life is long, the installation is easy, the maintenance is simple and convenient, and the like. Any position can be measured as long as there is an optical fiber passing through it. And (3) building a system for collecting the optical fiber sensing positioning network and the rescue monitoring software by utilizing the advantages of the optical fiber sensing technology.
The working principle of the early warning system is summarized as follows: the system outputs light waves through an ultra-narrow line width laser transmitter, the light waves are processed through an acousto-optic modulator and an amplifier and then are transmitted into optical fibers laid beside a track in a one-way mode through a circulator, according to the principles of Brillouin diffraction and Mach-Zehnder interference schemes, backward scattered light can be generated in the process that the light waves are transmitted along the optical fibers, the backward scattered light is transmitted in a one-way mode through the circulator, signals are amplified through the amplifier and then received by a photoelectric detector, the photoelectric detector receives weak vibration signals of damage, excavation, structural abnormality and the like along the track carried by the optical fibers, then data are stored on a data acquisition card, and the acquisition card can acquire and store equipment signals in real time for. The system software calculates the intensity of the signal and the receiving time of the reflected wave to obtain the time, intensity and position of the signal.
The early warning system has the main functions: (1) the system can lay the optical fiber at the periphery of a tunnel cave by adopting a distributed optical fiber sensor technology, detect the vibration and sound wave information of a leakage point by utilizing a distributed optical time domain scattering technology, and judge the deformation positions of an abnormal point and a track; (2) the system can acquire operation parameters, has an automatic temperature and vibration measurement function in the operation process, and can transmit data to a network in a data bus and wireless radio frequency mode; (3) the background server realizes data acquisition and analysis, analyzes and warns big data, and provides a special data acquisition board card, upper computer analysis software and a hardware platform when the data storage time is more than 3 years; (4) providing a computer, running analysis software and a data communication or storage transfer module (set), wherein a software system analyzes data according to user requirements; (5) the data acquisition system has the functions of data storage and transfer analysis, can acquire and store the operation data in real time, and adopts an SD card or a large-capacity storage hard disk as a storage mode;
the optical fiber sensing technology is a new sensing technology which takes light as a carrier and optical fiber as a medium and senses and transmits external signals, and a temperature stress strain sensor is an important content in the new sensing technology which is rapidly developed along with the development of optical fiber and optical fiber communication technology. The distributed optical fiber temperature stress strain monitoring system adopts a sensor with superior performances which are not possessed by the traditional sensor, such as low loss, quick response, explosion and flame prevention, corrosion resistance, easy arrangement, electromagnetic interference resistance, multipath transmission of signal data and the like. From the perspective of improving the measurement accuracy, the intelligent demodulation and signal optimization processing of the temperature of the detection unit are provided. The design meets the actual requirements of mine production, meets the actual requirements of an urban mine production system, can obtain the optimal alarm time, and is beneficial to eliminating potential safety hazards in production.
The distributed optical fiber monitoring system integrates optical fiber sensing, optical fiber transmission, optical fiber communication, photoelectric control, computer and other technologies. The device has the advantages of large measurement temperature range, wide measurement point distribution, large information acquisition amount, long transmission distance, simple structure and high reliability, has the characteristics of intrinsic safety, corrosion resistance, high voltage resistance, electromagnetic interference resistance, radiation resistance, vibration resistance and the like, can realize rapid multipoint real-time measurement, can accurately position alarm limit exceeding points, and is very suitable for uninterrupted operation in various toxic and harmful and severe environments such as large wind flow caused by high temperature, high humidity and piston effect.
The distributed optical fiber sensing technology only needs to adopt common optical fibers and can carry out real-time and continuous measurement on the temperature stress field distributed along the optical fibers, the span of the optical fibers can reach dozens of kilometers, and the defect that the traditional point type sensor is difficult to carry out all-around continuous monitoring on the measured field is completely overcome. The distributed optical fiber sensor monitoring system is applied to temperature monitoring of tunnel cave, effective early warning can be effectively provided for the fault conditions of power supply cables, power supply and distribution equipment and electrical fire along the equipment, the distributed optical fiber sensor monitoring system has the advantages of being unique in the aspects of improving the informatization management level, the safety production quality and the working efficiency, and has extremely wide market prospect and important social significance.
The optical fiber backbone network of the invention adopts a wavelength division multiplexing mode to complete the transmission of the collected signals, can bear a plurality of wavelengths on 1 channel (1 optical fiber), and simultaneously transmits the sensor signals working at different wavelength bands on a single channel by utilizing the characteristic that the working wavelengths are not interfered with each other so as to improve the transmission capacity of the optical fiber. Above hessian amber photoelectricity science and technology limited company SPA01 series optical fiber sensing analysis appearance is for example, can insert 64 at most passageways simultaneously, can bear 20 wavelengths simultaneously on the passageway, wavelength interval 0.4nm, single channel sampling frequency 50HZ, and a fiber analysis appearance can transmit thousands of wavelength information simultaneously, satisfies the demand to a plurality of monitoring point real-time supervision.
To sum up, the utility model discloses a temperature, water yield and stress field that ordinary optic fibre can distribute along optic fibre carry out real-time, continuous measurement, and the span of optic fibre can reach dozens of kilometers, has overcome traditional point type sensor and has been difficult to carry out the defect of all-round continuous monitoring to being surveyed the field.
The above description is only an example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. A distributed fiber cave depot fissure water monitoring and early warning system comprises a signal generator, an acousto-optic modulator, an EDFA amplifier, an echo EDFA amplifier, a circulator, optical fibers, a photoelectric detector and monitoring equipment, and is characterized in that the signal generator outputs light waves outwards; the acousto-optic modulator and the EDFA sequentially modulate and amplify the light waves of the signal generator; the circulator unidirectionally transmits the modulated and amplified light wave signals into optical fibers laid along the side wall of the cave depot, and unidirectionally transmits backward scattered light generated in the process of transmitting light waves by the optical fibers into an echo EDFA amplifier; the photoelectric detector receives water temperature, water quantity and stress strain signals carried in the optical fiber scattering light amplified by the echo EDFA amplifier;
the optical fiber terminal is connected with a water quantity sensor for collecting water quantity and water temperature information, an optical fiber grating displacement sensor for detecting the separation layer displacement of the top plate, a pressure sensor for detecting filling stress and a pressure distress sensor for sending a distress signal.
2. The distributed optical fiber cave depot fissure water monitoring and early warning system as claimed in claim 1, wherein the monitoring device stores water temperature, water quantity and stress-strain signals, and calculates according to the strength and receiving time of the signals to obtain the time, strength and position of the signals.
3. The distributed optical fiber cave depot fissure water monitoring and early warning system of claim 1, wherein the signal generator adopts an ultra-narrow linewidth laser transmitter.
4. The distributed optical fiber cave depot fissure water monitoring and early warning system as claimed in claim 1, wherein the water quantity signal, the water temperature signal and the stress strain signal are obtained by a water quantity sensor connected to an optical fiber terminal, when fissure water leakage occurs, part of light waves of an optical fiber are absorbed by the leaked fissure water, the rest of light wave signals return to a photoelectric detector, the returned light wave signals are compared with an original light wave signal source, readings of all the sensors are updated within a few seconds, and a monitoring device calculates and stores water flow around each water quantity sensor according to the returned light wave signals.
5. The distributed optical fiber cave depot fissure water monitoring and early warning system as claimed in claim 1, wherein the fiber grating displacement sensor has two probes, and the two probes are respectively installed at a fixed measuring point and a reference measuring point through probe fixing members.
6. The distributed optical fiber cave depot fissure water monitoring and early warning system as claimed in claim 1, wherein a distress button is arranged on the pressure distress sensor, and a cover plate for preventing the distress button from being touched by mistake is arranged above the distress button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922250638.1U CN211147738U (en) | 2019-12-13 | 2019-12-13 | Distributed optical fiber cave depot fracture water monitoring and early warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922250638.1U CN211147738U (en) | 2019-12-13 | 2019-12-13 | Distributed optical fiber cave depot fracture water monitoring and early warning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211147738U true CN211147738U (en) | 2020-07-31 |
Family
ID=71746437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922250638.1U Active CN211147738U (en) | 2019-12-13 | 2019-12-13 | Distributed optical fiber cave depot fracture water monitoring and early warning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211147738U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728422A (en) * | 2020-12-25 | 2021-04-30 | 苏州欣皓信息技术有限公司 | Leakage monitoring and positioning method and system for pipeline coated with distributed optical fiber |
| CN113194590A (en) * | 2021-04-20 | 2021-07-30 | 核工业西南物理研究院 | Electrostatic probe head |
-
2019
- 2019-12-13 CN CN201922250638.1U patent/CN211147738U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728422A (en) * | 2020-12-25 | 2021-04-30 | 苏州欣皓信息技术有限公司 | Leakage monitoring and positioning method and system for pipeline coated with distributed optical fiber |
| CN112728422B (en) * | 2020-12-25 | 2023-03-14 | 苏州欣皓信息技术有限公司 | Leakage monitoring and positioning method and system for pipeline coated with distributed optical fiber |
| CN113194590A (en) * | 2021-04-20 | 2021-07-30 | 核工业西南物理研究院 | Electrostatic probe head |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101592475B (en) | Fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor | |
| CN207095615U (en) | Tunnel monitoring system based on fiber grating | |
| CN100487386C (en) | Multi-parameter detector based on composite optical fiber device | |
| CN201278201Y (en) | Pipeline landslide monitoring pre-alarming system based on fiber grating | |
| CN201779455U (en) | Mining subsidence area oil gas pipeline monitoring system | |
| CN102345795B (en) | Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area | |
| CN102346016B (en) | Mined-out subsidence area soil horizontal deformation monitoring method and system thereof | |
| CN101667327A (en) | Method and system for monitoring and warning pipeline landslide depth displacement and method for constructing system | |
| CN201278199Y (en) | Pipeline landslide deep displacement monitoring pre-alarming system based on fiber grating | |
| CN211147738U (en) | Distributed optical fiber cave depot fracture water monitoring and early warning system | |
| CN101295026A (en) | Levee intelligent detecting early-warning method based on wireless sensing net | |
| CN102997060A (en) | Leakage point locating system of optical fiber sensing natural gas pipeline leakage monitoring system | |
| CN102564312A (en) | Landslide depth displacement monitoring device | |
| CN201028977Y (en) | Multi-parameter detecting instrument based on compound optical fiber device | |
| CN110160626A (en) | Full-time universe grating array subway tunnel structure safety monitoring system | |
| CN112504336A (en) | Landslide area pipeline deformation monitoring system | |
| CN206833669U (en) | A kind of slope geological monitoring and warning system | |
| CN202093655U (en) | Underwater geological disaster monitoring system | |
| CN102278948A (en) | Compound optical fiber sensing monitoring system and method based on optical fiber compound sensing module | |
| CN102345797A (en) | System for monitoring oil-gas pipeline in mining subsidence area | |
| CN114017121B (en) | Rock burst real-time monitoring system and early warning method based on strain field | |
| CN213274636U (en) | Distributed optical fiber heat supply pipeline leakage detection early warning system | |
| CN102346012B (en) | Construction method of monitoring system for mining subsidence area oil gas pipeline pipe soil relative displacement | |
| CN203177924U (en) | Water level monitoring device based on three optical fiber grating structures | |
| CN201803704U (en) | Soil mass horizontal deformation monitoring system used in mining subsidence area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |