CN201191221Y - Disturbance signal determination module of distributed optical fiber vibration sensor system - Google Patents
Disturbance signal determination module of distributed optical fiber vibration sensor system Download PDFInfo
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- CN201191221Y CN201191221Y CNU2008201162234U CN200820116223U CN201191221Y CN 201191221 Y CN201191221 Y CN 201191221Y CN U2008201162234 U CNU2008201162234 U CN U2008201162234U CN 200820116223 U CN200820116223 U CN 200820116223U CN 201191221 Y CN201191221 Y CN 201191221Y
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Abstract
A distribution type optical fiber vibration induction system interference signal judgment module is mainly for the all-detection of the pipes transmitting various dangerous or expensive chemicals, wherein a first output (109-1), a LD laser (101), an optical fiber amplifier (102) and an optical fiber splitter (103) of a background terminal (109) are serially connected, the output of the optical fiber splitter (103) is divided into two paths, while one path is connected with an induction optical fiber (104) and the another path is connected serially with a light filter (105), a light detector (106), an amplifier (107) and a data acquisition module (201), and the data acquisition module (201) is connected with the background terminal (109). The distribution type optical fiber vibration induction system interference signal judgment module can measure and detect wide domain all optical fiber systems, to realize interference signal positioning and mode recognition and manage the operation of the systems.
Description
Technical field
The utility model is mainly used in the pipe monitoring of all kinds of conveying danger or high value chemicals pipe safety monitoring etc., be a kind of broad domain all-optical fiber disturbance sensing of circumference safety guard and the disturbance positioning signal treatment technology of positioning system, belong to Fibre Optical Sensor detection technique field.
Background technology
Optical fiber sensing technology is to be accompanied by the development of light transmitting fiber and Fibre Optical Communication Technology the seventies in 20th century and to ward off a kind of brand-new sensing technology that new footpath develops rapidly in addition.Put it briefly, Fibre Optical Sensor is exactly to utilize optical fiber with to be measured the light wave parameter that transmits in the optical fiber to be modulated, and the lightwave signal of modulated mistake is carried out the demodulation detection, thereby obtains a kind of device of quantity to be measured.
The principle of wide-field full-optical fiber fixer network system is based on back to the Rayleigh scattering effect in the optical fiber, realizes distributed vibration survey by optical time domain reflection technology.Wide-field full-optical fiber fixer network system becomes an extremely noticeable new technology in the optical fiber sensing technology with its characteristics that can measure in real time measured continuous space.Wide-field full-optical fiber fixer network system not only has the characteristics of general Fibre Optical Sensor, and the characteristics of optical fiber space continuous distribution have been made full use of, can be along obtaining measured time and space distribution information on the path of fiber distribution simultaneously, at one stroke solve the measuring task that the other types sensor is difficult to be competent under many major application occasions, demonstrated very economic and real application prospect.
For some critical facilitys or zone, as military restricted zone, high-risk forbidden zone etc., traditional iron wire electrical network is very low to the efficient that circumference safeguard protection, prevention trespass.And the employing optical fiber safety early-warning system can not only improve the alarm efficient of circumference greatly, can also the alarm place accurately be located, and monitors.Thereby realize actual time safety early warning to whole important area.To critical facility and zone, constructing circumference thing or buried pipeline, to use wide-field full-optical fiber fixer network system be the inexorable trend of technical development, has wide application market.
Abroad, wide-field full-optical fiber fixer network system is by a large amount of optical fiber safety early-warning and positioning systems that is applied in.The continuous development and the popularization of optical fiber sensing technology thereupon, various optical-fiber security early-warning location technologies are also in continuous development.Present existing safety monitoring mainly contains two classes.A kind of is distributed temperature and stress monitoring technology, mainly utilize the nonlinear characteristic (Ramam effect and brillouin effect) of optical fiber to gather the position that extraneous incident is determined alarm to the temperature effect and the shock stress of optical fiber in real time, this technology is subjected to the distance limit of the structure of optical cable and optical cable and place of alarm and influences monitoring effect.Another kind is exactly the sonic detection technology that is commonly used in the pipeline damage warning aspect, this technology is to utilize sound wave along the pipeline transmission principle, an active sensor is installed at a certain distance, gathering pipeline voice signal along the line is analyzed, determine event property, and then find in advance destroying the pipeline incident, but each senser element must be equipped with a cover electric supply installation and a communicator, this has not only increased the investment and the maintenance cost of equipment, and these facilities itself are also destroyed easily, make system's cisco unity malfunction.
Summary of the invention
Technical matters: the purpose of this utility model provides a kind of distributed optical fiber vibration sensing system disturbing signal discrimination module, be used to measure and detect the work of wide-field full-optical fiber system, coordinate better and finish in the system disturbing signal location and pattern-recognition, managed the task of system.
Technical scheme: when light signal was propagated in optical fiber, disturbing signal produced the backscattering effect.Realize what distributed disturbance was measured by optical time domain reflection technology.Wide-field full-optical fiber fixer network system not only has the basic characteristics of general sensor, and the characteristics of optical fiber space continuous distribution have been made full use of, can solve the measuring task that the other types sensor is difficult to be competent under the application scenario, many wide territories at one stroke along the time and the space distribution information that obtain measured parameter on the path of fiber distribution simultaneously.
Broad domain all-optical fiber disturbance sensing and location composite signal by preceding class survey with amplify after, function such as show in the time of must finishing data acquisition, data processing, the identification of various perturbation mode, fructufy by background monitoring system.Also need possess the historical data management function simultaneously, preserve the useful data of gathering, for the user search inquiry.Therefore, background monitoring system is the control core of whole network system.
According to the different application demand, supervisory system optimization system task, the mode of operation and the course of work of employing preferred plan decision systems.Because destabilization sensing and location composite signal are diverse two kinds of signals, thus how to set they order of work and working method for finishing system monitoring and detecting particular importance, differentiate rule before and after this mode of operation is defined as.
Supervisory system detects the destabilization sensing light signal constantly under normal condition.When monitoring light signal when the abnormal disturbances waveform occurring, enter supervisory system abnormality processing module.At first write down current event, enter abnormal disturbances positioning system program then, detect the disturbance positioning signal, determine the position of abnormal disturbances point rapidly.Carry out continuous wave then and detect, the destabilization sensing signal that record is used for pattern-recognition, the attribute of definite signal carries out true and false examination after treatment, draws the reason that produces disturbance.This is to differentiate rule before preferential monitor mode is orientated as with event location.
When system works is differentiated rule in the back, system at first is operated in the continuous wave mode, detect the destabilization sensing light signal, and regularly unusual light signal is sent to pattern recognition module, differentiate the true and false of disturbing signal, when being identified when being useful disturbing signal, supervisory system starts positioning function, detect disturbance location light signal, determine to produce the position of disturbance.The position of display abnormality disturbance, thus determine alert levels, start warning device.
Wide-field full-optical fiber perturbation signal anterior-posterior method of discrimination is: background terminal is controlled the work of whole wide-field full-optical fiber perturbation detection system, differentiates rule and two kinds of mode of operations of back differentiation rule before can being divided into; When system is in running order, produce control command by control circuit, the selection of control circuit control detection pattern allows system works at continuous wave mode, perhaps is operated under the pulsating wave pattern; Under continuous operation mode, system detects the destabilization sensing signal whether occurs; And under the pulsed operation state, system sends and the detection and location signal, disturbance place, location; Under selected mode of operation, system finishes and the corresponding Photoelectric Detection of mode of operation, and photosignal is in light inspection circuit, after amplification and conditioning, deliver in the data acquisition module and gather, the signal of collection forms after treatment to the destabilization sensing signal processing results.
Under the preceding differentiation rule mode of operation, supervisory system is under normal condition, operate in normal mode of operation, moment sensed light signal, this moment, system works was at continuous wave mode, light signal after gathering carries out threshold process, differentiate fast, when the destabilization sensing signal amplitude that monitors surpasses threshold value, enter supervisory system abnormality processing module, logout module records current event, enter unusual locating module then, system switches to the pulsating wave pattern, sends the position pulse signal, after the position of determining unusual fluctuations point is the disturbance location, the result is presented on the corresponding map location by the abnormal show module; Afterwards, supervisory system enters pattern recognition program, starts continuous wave mode, send the continuous wave light signal, detect and record destabilization sensing signal, in pattern recognition module, distinguish out the classification of abnormal disturbances transducing signal, determine alert levels through the deciding grade and level module of reporting to the police again, thereby start warning device.
The back is differentiated under the rule mode of operation, and system operates in normal mode of operation, constantly detects the destabilization sensing light signal, and the destabilization sensing light signal after the collection carries out the threshold value pre-service, differentiates fast; When monitoring the destabilization sensing signal amplitude above threshold value, enter supervisory system abnormality processing module, logout module records current event enters pattern recognition module then, identification disturbing signal kind; If determine is harmless disturbance, and then system turns back to normal mode of operation, if system identification then enters unusual locating module for harmful disturbance, the starting impulse wave mode sends the location light pulse; Locate light pulse signal exactly from the light signal that the disturbing source scattering is returned, after tested, determine unusual fluctuations point position rapidly by unusual locating module, the abnormal show module is presented at the result on the corresponding map location; After determining the position, system according to the character of disturbance, determines alert levels through the deciding grade and level module of reporting to the police, thereby starts warning device again.
Unusual locating module adopts a kind of based on high-speed data acquisition and hypervelocity method of counting, high-speed data acquisition card is gathered the scatter echo signal, determine the position of scatter echo signal by recognizer, thereby the thick step determines to take place the approximate location of vibration source, in order to shield various undesired signals, coarse position information is converted into the time gate, guarantees that other invalid signals does not enter count pulse.
The discriminating gear that is used for the front/rear method of discrimination of the described wide-field full-optical fiber perturbation signal of claim 1, first output terminal of background terminal, LD laser instrument, fiber amplifier, optical fiber splitter are connected in series in proper order, the output terminal of optical fiber splitter divides two-way, wherein one the tunnel connect sensor fibre, another road and optical filter, photo-detector, amplifier, data acquisition module are connected in series in proper order; Data acquisition module also is connected with background terminal.
Beneficial effect: distributed optical fiber vibration sensing system disturbing signal discrimination module can be realized high-speed real-time collection, processing and the pattern-recognition of optical fiber disturbance signal, improved the bearing accuracy of whole wide-field full-optical fiber fixer network system, can reach 60KM position length and ± bearing accuracy of 50M.And wide-field full-optical fiber perturbation signal anterior-posterior discriminating gear and correlation method can also show in real time, record disturbance point information, help the supvr and make correct safety practice rapidly, thereby improved by the security of defence circumference.
Description of drawings
Fig. 1 broad domain all-optical fiber disturbance sensing and fixer network systematic schematic diagram,
Differentiate the rule block diagram before Fig. 2 wide-field full-optical fiber perturbation monitoring system,
Differentiate the rule block diagram after Fig. 3 wide-field full-optical fiber perturbation monitoring system.
101-LD laser instrument 102-fiber amplifier wherein
103-optical fiber splitter 104-sensor fibre
105-optical filter 106-photo-detector
107-amplifier 109-background terminal
201-data acquisition module 202-light inspection circuit
The 203-control circuit
211-abnormality processing module 212-logout module
The unusual locating module 214-of 213-abnormal show module
215-pattern recognition module 216-warning deciding grade and level module
Embodiment
Broad domain all-optical fiber disturbance sensing that one cover is complete and fixer network system are as shown in Figure 1.
A. by background terminal 109 logic controls, produce pulsed drive, produce the pump light pulse by LD laser instrument 101 again, after carrying out power ascension, fiber amplifier (EDFA) 102 closes into sensor fibre 104 by optical fiber splitter (3dB photo coupler) 103 lotus roots, in sensor fibre 104, will produce rear orientation light, the rear orientation light of returning carries out filtering and separates to optical filter 105 through optical fiber splitter coupling 103 again, thereby obtain the back to Rayleigh scattering light, just finished the collecting work of signal since then.
B. afterwards enter photodetector (PD) 106 more respectively to Rayleigh scattering light and carry out opto-electronic conversion from what optical filter 105 was separated, amplify through prime again, thereby finish the photodetection work of signal.
C. this moment, signal became the level form by the luminous power formal transformation, entering 107 pairs of level signals of amplifier more respectively amplifies, then carry out analog to digital conversion by data acquisition module 201 respectively, thereby obtain digital signal, carry out signal Processing, analytical calculation by 109 pairs of digital signals of background terminal again, just finally obtain warning message.
Realize principle
The anterior-posterior discriminating gear structure of broad domain all-optical fiber disturbance sensing and positioning signal detection system as shown in Figure 2.In background monitoring system, use background terminal 109, it controls the work of whole wide-field full-optical fiber perturbation detection system.When system is in running order, can produce control command by control circuit 203.Control circuit 203 can the control detection pattern selection, allow system works at continuous wave mode, perhaps be operated under the pulsating wave pattern.Under continuous operation mode, system detects the destabilization sensing signal; And under the pulsed operation state, system sends and the detection and location signal.Under selected mode of operation, system finishes and the corresponding Photoelectric Detection of mode of operation.Photosignal after amplification and conditioning, is delivered in the data acquisition module 201 and is gathered in light inspection circuit 202.The signal of gathering forms after treatment to the destabilization sensing signal processing results.
According to the needs of actual conditions, before can being operated in, system differentiates under rule and two kinds of mode of operations of back differentiation rule.Corresponding front and back rule mode of operation can be selected by artificial the setting by system.Elaborate with regard to these two mode of operations below.
Preceding differentiation rule system chart is referring to accompanying drawing 2, and its principle of work is as follows:
Supervisory system operates in normal mode of operation under normal condition, constantly sensed light signal.From the difficulty or ease angle of input, system can be operated in continuous wave mode.Light signal after gathering is handled, and uses threshold method here, differentiates fast.The setting of threshold value can have following three kinds of methods:
1, artificial setting method: use manual keyboard or mouse input signal threshold value.
2, the disturbance Equivalent method: use the benchmark disturbing source, send disturbance at far-end, the system acquisition disturbing signal calculates the disturbance level, determines that this level is an alarm level.
3, self study level method: by autolearn feature, system can determine the upward normal back of the body of each resolution point
The scape noise.System can be arranged to default value, also can learn, and determines parameter.
When the destabilization sensing signal amplitude that monitors surpasses threshold value, enter supervisory system abnormality processing module 211.At first logout module 212 writes down current events, and recorded content comprises event time and intensity etc.Enter unusual locating module 213 then, system switches to the pulsating wave pattern, sends the position pulse signal.Be converted into electric impulse signal from the location light pulse signal that disturbing source returns through photoelectric conversion device, the anchor point signal is through testing circuit detection and location pulse positioning time.
In order to improve bearing accuracy, a kind of localization method based on high-speed data acquisition and hypervelocity counting technology has been proposed.High-speed data acquisition card is gathered the scatter echo signal, determines the position of scatter echo signal by recognizer, thereby slightly goes on foot the approximate location of determining to take place vibration source.In order to shield various undesired signals, coarse position information is converted into the time gate, guarantee that other invalid signals does not enter count pulse.
In order to finish high-speed counting, designed the counting mode of unique double counters.High frequency oscillator produces high-frequency signal, behind phase inverter, can obtain positive and anti-phase two groups of high-frequency oscillation signals.Use two counters respectively, a rolling counters forward positive oscillator signal, another rolling counters forward inverse oscillation signal.Owing to use positive and anti-phase counting, make count frequency double, corresponding bearing accuracy doubles.Reach with the high purpose of bearing accuracy under the equifrequent.
After determining the position of unusual fluctuations point rapidly, the result is presented on the corresponding map location by abnormal show module 214.Afterwards, supervisory system enters pattern recognition program, starts continuous wave mode, sends the continuous wave light signal, detects and record destabilization sensing signal.In pattern recognition module 215, distinguish out the classification of abnormal disturbances transducing signal, determine alert levels through the deciding grade and level module 216 of reporting to the police again, thereby start warning device.
The rule system chart is differentiated referring to accompanying drawing 3 in the back, and its principle of work is as follows:
When system works was differentiated the monitor state of rule in the back, system operated in normal mode of operation, detects the destabilization sensing light signal constantly.Destabilization sensing light signal after the collection carries out pre-service, uses threshold method, differentiates fast.
When monitoring the destabilization sensing signal amplitude, enter supervisory system abnormality processing module 211 above threshold value.At first logout module 212 writes down current events, and recorded content comprises event time and intensity etc.Enter pattern recognition module 215 then, identification disturbing signal kind.If determining is harmless disturbance, then system turns back to normal mode of operation 210.If system identification then enters unusual locating module 213 for harmful disturbance, the starting impulse wave mode sends the location light pulse.Locate light pulse signal exactly from the light signal that the disturbing source scattering is returned.After tested, determine unusual fluctuations point position rapidly by unusual locating module 213, abnormal show module 214 is presented at the result on the corresponding map location.After determining the position, system determines alert levels through the deciding grade and level module 216 of reporting to the police again, thereby starts warning device according to the character of disturbance.
Also the present invention is described further with this example embodiment of the present utility model to be described.This example is an experimental prototype.System host is joined 4CPU 8M buffer memory 32G internal memory for the perfectly sound R630G5 of association.The high-speed data acquisition card that data collecting card adopts specialized company to provide.On the capture card integrated 2 high speed 50Msps 12-bitA/D converters and 2 independently high speed and precision operational amplifier and accurate attenuation filter network form the programme-controlled gain passage, realizations ± 100mV arrives ± the big dynamic signal acquisition of 20V.Capture card has designed independently time reference and clock controller.By software setting system triggers line and clock line are cascaded up, acquisition system is at unified clock and trigger the full synchronous acquisition of realization under the control.The highest sample frequency of A/D conversion is 40MHz, realizes 18 grades of sampling rate settings by 1,2,5 frequency divisions; Two passages can be independently with the software control gain, is divided into 8 grades from ± 100mV to ± 20V by 1,2,5.The maximum sampling depth of every passage can reach the 16M sampled point.Can gather required continuous signal and pulse signal by capture card by the sample command that controller sends.
Background monitoring system adopts the Windows operating platform, has stronger versatility and friendly man-machine interface.The database of selecting for use is MySQL, is a Universal Database, obtains most of users' support.Supervisory system uses programming language to be VC++.
By the rule that proposes in the utility model, system can the real-time geographic position display, covers display alarm and incident on background image, thereby invador's vision localization clearly is provided.Information is presented on map, planimetric map or the photo.Can finish the incident location automatically or be locked in special visual angle.
Supervisory system can show histogram in real time.Histogram is presented at the Oscillation Amplitude that detects on each distinguishable point on the whole optical fiber.Can use the Zoom function to amplify any zone on the optical cable, so that carry out labor.In addition, can show original waveform and data.
Supervisory system is output audio in real time.Operating personnel can monitor the audio signal on selected any two random points on the optical cable.System can write down the acoustic signals on the multiple spot simultaneously, and the sound wave of record can be play, preserves or export.
According to the pattern-recognition result, system produces warning automatically.When system detects the parameter value that signal surpass to set, produce automatically and report to the police.
When the background monitoring PC is formed network system, designed network structure, can realize following expanded function:
The user who uses native system is classified, and different classes of user will have different rights and responsibility, to realize Information hiding better and to share; Authority is set.A is elementary: read-only; B middle rank: revise systematic parameter; C keeper: control total system operation.
System adopts B/S (browser/server) structure, and the browser that client only needs to carry by MS Windows can the travel all over system.This structure is relatively low to the computer hardware performance requirement of client, can make full use of existing resource.
Claims (1)
1. distributed optical fiber vibration sensing system disturbing signal discrimination module, it is characterized in that: in this device, first output terminal (109-1) of background terminal (109), LD laser instrument (101), fiber amplifier (102), optical fiber splitter (103) order are connected in series, the output terminal of optical fiber splitter (103) divides two-way, wherein one the tunnel connect sensor fibre (104), another road and optical filter (105), photo-detector (106), amplifier (107), data acquisition module (201) order are connected in series; Data acquisition module (201) also is connected with background terminal (109).
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| CN102242870A (en) * | 2011-06-22 | 2011-11-16 | 东北大学 | Duffing-based detection device and method for distributed optical fiber pipeline leakage |
| RU2449210C1 (en) * | 2010-10-25 | 2012-04-27 | Открытое акционерное общество "Авангард" | Control method of main pipeline state |
| CN102997053A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | System for measuring propagation speed of natural gas pipe leakage vibration wave |
| CN102997061A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Optical fiber sensor-based natural gas pipeline leakage monitoring system |
| CN103208161A (en) * | 2013-03-19 | 2013-07-17 | 石家庄供电公司 | Active detecting type fiber grating cable tunnel security and protection monitoring system |
| CN105096490A (en) * | 2015-09-02 | 2015-11-25 | 同方威视技术股份有限公司 | Distributed optical fiber perimeter security-monitoring system, sound reduction system and method |
| CN105225381A (en) * | 2015-10-14 | 2016-01-06 | 国家电网公司 | A kind of intruding detection system based on optical fiber fence |
| CN106323443A (en) * | 2016-08-31 | 2017-01-11 | 威海北洋光电信息技术股份公司 | Long-distance distributed optical fiber vibration monitoring device and realization method thereof |
| CN106570999A (en) * | 2016-11-04 | 2017-04-19 | 山东省科学院激光研究所 | Optical fiber isolation net array and optical fiber isolation net system |
| CN107067609A (en) * | 2017-06-22 | 2017-08-18 | 云南电网有限责任公司昭通供电局 | Transformer station's optical fiber perimeter security protection monitoring system |
| CN107464400A (en) * | 2017-07-14 | 2017-12-12 | 深圳市盛路物联通讯技术有限公司 | The method of controlling security and Related product of restricted clearance based on Internet of Things |
| CN108194839A (en) * | 2017-12-25 | 2018-06-22 | 北京市热力工程设计有限责任公司 | A kind of leakage monitoring cable network based on heat distribution pipeline |
| CN108709633A (en) * | 2018-08-29 | 2018-10-26 | 中国科学院上海光学精密机械研究所 | Distributed optical fiber vibration sensing intelligent and safe monitoring method based on deep learning |
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| CN116094593A (en) * | 2023-04-12 | 2023-05-09 | 山东新科凯邦通信器材有限公司 | Signal detection method based on optical fiber communication |
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| CN102242870B (en) * | 2011-06-22 | 2012-11-21 | 东北大学 | Duffing-based detection device and method for distributed optical fiber pipeline leakage |
| CN102242870A (en) * | 2011-06-22 | 2011-11-16 | 东北大学 | Duffing-based detection device and method for distributed optical fiber pipeline leakage |
| CN102997053B (en) * | 2011-09-14 | 2015-08-19 | 中国石油天然气集团公司 | A kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage |
| CN102997053A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | System for measuring propagation speed of natural gas pipe leakage vibration wave |
| CN102997061A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Optical fiber sensor-based natural gas pipeline leakage monitoring system |
| CN102997061B (en) * | 2011-09-14 | 2015-05-13 | 中国石油天然气集团公司 | Optical fiber sensor-based natural gas pipeline leakage monitoring system |
| CN103208161B (en) * | 2013-03-19 | 2016-02-03 | 石家庄供电公司 | Active detection type fiber grating cable tunnel safety defense monitoring system |
| CN103208161A (en) * | 2013-03-19 | 2013-07-17 | 石家庄供电公司 | Active detecting type fiber grating cable tunnel security and protection monitoring system |
| CN105096490A (en) * | 2015-09-02 | 2015-11-25 | 同方威视技术股份有限公司 | Distributed optical fiber perimeter security-monitoring system, sound reduction system and method |
| CN105225381B (en) * | 2015-10-14 | 2018-02-13 | 国家电网公司 | A kind of intruding detection system based on optical fiber fence |
| CN105225381A (en) * | 2015-10-14 | 2016-01-06 | 国家电网公司 | A kind of intruding detection system based on optical fiber fence |
| CN106323443A (en) * | 2016-08-31 | 2017-01-11 | 威海北洋光电信息技术股份公司 | Long-distance distributed optical fiber vibration monitoring device and realization method thereof |
| CN106570999A (en) * | 2016-11-04 | 2017-04-19 | 山东省科学院激光研究所 | Optical fiber isolation net array and optical fiber isolation net system |
| CN107067609A (en) * | 2017-06-22 | 2017-08-18 | 云南电网有限责任公司昭通供电局 | Transformer station's optical fiber perimeter security protection monitoring system |
| CN107464400A (en) * | 2017-07-14 | 2017-12-12 | 深圳市盛路物联通讯技术有限公司 | The method of controlling security and Related product of restricted clearance based on Internet of Things |
| CN108194839A (en) * | 2017-12-25 | 2018-06-22 | 北京市热力工程设计有限责任公司 | A kind of leakage monitoring cable network based on heat distribution pipeline |
| CN108709633A (en) * | 2018-08-29 | 2018-10-26 | 中国科学院上海光学精密机械研究所 | Distributed optical fiber vibration sensing intelligent and safe monitoring method based on deep learning |
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