CN105136101A - Real-time bridge state parameter monitoring and alarm system - Google Patents
Real-time bridge state parameter monitoring and alarm system Download PDFInfo
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- CN105136101A CN105136101A CN201510219886.3A CN201510219886A CN105136101A CN 105136101 A CN105136101 A CN 105136101A CN 201510219886 A CN201510219886 A CN 201510219886A CN 105136101 A CN105136101 A CN 105136101A
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Abstract
The invention discloses a real-time bridge state parameter monitoring and alarm system. The real-time bridge state parameter monitoring and alarm system comprises a bridge detection sensor group, a snapshot camera, a field main controller, a far-end service processor and a client, wherein the bridge detection sensor group comprises an environment detection sensor unit, a flow detection sensor unit and a structure detection sensor unit, and the field main controller comprises a central control unit, and a data acquisition unit, a synchronization triggering control unit, a field wireless data transmission unit and a GPS time service unit which are connected with the central control unit. According to the real-time bridge state parameter monitoring and alarm system, time signals of a GPS are added to measurement results, time indication codes are added to output data of the sensor and the camera, and precise data synchronization is realized; analysis and determination on data of structure detection sensors are carried out to realize complete monitoring on dynamic deformation, data resources are saved, and wireless data transmission and data storage and copy pressure is reduced.
Description
Technical field
The invention belongs to mechanical meaurement technical field, relate to a kind of measuring multiple parameters technology that can be used for Bridge object, particularly a kind ofly to measure in real time and the system of reporting to the police for bridge deformation parameter.
Background technology
The distortion of bridge mainly comprises static deformation and dynamic deformation, static deformation refers to that ground sink, tilt and distortion that the change such as stress relaxation is very slow, dynamic deformation refers to the shortterm deflection because wind, temperature, earthquake and traffic load cause, and its parameter monitoring has important effect for the safety assessment analysis of target.A lot of country has all dropped into very large manpower and materials in the world, carries out the research of bridge deformation measuring technique.
The instrument that traditional bridge deformation detects has dial gauge, clock gauge, accelerometer, spirit-leveling instrument, transit etc.At present, these instruments still widely use in bridge acceptance, periodic detection, but need professional and technical personnel, time-consuming, effort, and personal error is large, can not realize online, real-time, automatic, intelligent measure far away.
In recent years, the flourish development greatly having driven bridge deformation measuring technique of infotech, emerged in large numbers many new technology and methods, but these methods also also exists following problem in the application:
(1) number of sensors kind is many, is difficult to the precise synchronization realizing all kinds of output data, brings difficulty to the fusion of follow-up data, process and analysis;
(2) monitoring of bridge deformation belongs to long-term, add that number of sensors is more, in order to save data resource, reduce the pressure of Wireless Data Transmission and data backup memory, need the long term monitoring of static deformation being carried out to low time sense, dynamic deformation is carried out to the short-term Centralizing inspection of high time resolution power, but existing monitoring system is difficult to realize above-mentioned control simultaneously, causes the waste of data resource or be difficult to the high time resolution power reached special event and measure;
(3) shortcoming transmits warning message for artificial treatment in time to client.These defects detect to the intelligent omnibearing of bridge and make troubles, and have influence on the safety of bridge, maintenance and managed operation.
Summary of the invention
The object of the present invention is to provide a kind of bridge state parameter Real-Time Monitoring and warning system, this system has installed environmental detection sensor, flow detection sensor, structure detection sensor and the candid photograph camera for the monitoring of integral bridge pattern on bridge, and time synchronized control treatment is carried out, for data add time mark to each sensor and camera; Simultaneously by judging the signal threshold value of structure detection sensor, controlling to capture camera work, identifying dynamic deformation event, achieve the complete documentation to time burst.
For achieving the above object, the invention provides following technical scheme:
A kind of bridge state parameter Real-Time Monitoring and warning system, comprise bridge machinery sensor group, capture camera, on-the-spot primary controller, remote service processor and client;
Described bridge machinery sensor group comprises environmental detection sensor unit, flow detection sensor unit and structure detection sensor unit;
Described on-the-spot primary controller comprises central control unit and the data acquisition unit be connected with central control unit, synchronous trigger control unit, on-site wireless data transmission unit and GPS time service unit; Central control unit control data collecting unit obtains the data of bridge machinery sensor group according to synchronous trigger control unit instruction acquisition, after data fusion being entered the time-tagging code of GPS time service unit, then transfer to remote service processor through on-site wireless data transmission unit;
Described remote service processor comprises far-end wireless data transmission unit and Data Management Analysis unit, after far-end wireless data transmission unit receives the data of on-site wireless data transmission unit transmitting, analyzing and processing and examination is carried out by Data Management Analysis unit, the result exceeding activation threshold value is sent to client, steering order is sent to the central control unit of on-the-spot primary controller through on-site wireless data transmission unit simultaneously, bridge signal is gathered according to respective frequency of operation for controlling one or more groups sensor captured in camera work and bridge machinery sensor group.
As the further scheme of the present invention: the workflow of described candid photograph camera is: carry out in processing procedure at Data Management Analysis unit to the sensing data of structure detection sensor unit, when the sudden change amplitude that sensing data occurs exceeds the threshold value preset, be judged as that bridge creates dynamic deformation, remote service processor sends alarm command to client on the one hand, on the other hand instruction is sent to the central control unit of on-the-spot primary controller, drive and capture camera work, record is carried out to the general image of bridge; In addition, the time of origin of dynamic deformation relies on the sensing data of structure detection sensor unit to judge; When the sudden change amplitude that the sensing data of structure detection sensor unit occurs does not exceed the threshold value preset, when also namely parameter is tending towards normal, then captures camera and stop video capture.
As the further scheme of the present invention: when the Data Management Analysis element analysis of remote service processor exceeds threshold value to any one sensing data of bridge machinery sensor group, remote service processor sends alarm command to client on the one hand, send instruction to the central control unit of on-the-spot primary controller on the other hand, drives structure detection sensor unit accelerates the frequency of signals collecting.
As the further scheme of the present invention: the time-base signal that described synchronous trigger control unit provides according to GPS time service unit, and by the frequency set, the sensing data of synchronous trigger data acquisition unit to bridge machinery sensor group gathers.
As the further scheme of the present invention: described Data Management Analysis unit is used for analyzing sensing data, processing, and capture the judgement of camera activation threshold value, and according to the time-base signal that GPS time service unit provides, the view data of sensing data and candid photograph camera is processed, and time-tagging code is added to the data after process.
As the further scheme of the present invention: described time mark code, as the frame head of sensing data, is made up of 6 bytes.
As the further scheme of the present invention: described environmental detection sensor unit comprises the one or more combination in temperature sensor, air velocity transducer, rain sensor; Flow detection sensor unit comprises the one or more combination in ground propagated sensation sensor, infrared sensor, LOAD CELLS; Structure detection sensor unit comprises the one or more combination in displacement transducer, strain transducer, vibration transducer.
As the further scheme of the present invention: institute's displacement sensors adopts the remote displacement sensor be arranged on bridge, strain transducer adopts fiber Bragg grating strain sensor, and vibration transducer adopts the sensor of electromagnetic principle.
As the further scheme of the present invention: described candid photograph camera is ccd sensor or cmos sensor; Described client is computer or the mobile intelligent terminal for data receiver.
As the further scheme of the present invention: described far-end wireless data transmission unit and on-site wireless data transmission unit are GPRS wireless transmitting system or 3G wireless transmitting system or 4G wireless transmitting system or RF wireless transmitting system.
Compared with prior art, the invention has the beneficial effects as follows:
(1) time signal of GPS is introduced measurement result, and add time-tagging code for the output data of sensor and camera, achieve the precise synchronization of data, for follow-up data process and analysis provide synchronous base.
(2) by the analysis of structure detection sensor and other sensing datas and threshold decision, determine that detected bridge belongs to static deformation or dynamic deformation, and carry out high-frequency detection according to the sensor that signal threshold value triggering candid photograph camera work and control are correlated with, achieve the complete monitoring to bridge dynamic deformation, ensure that the monitoring to bridge comprehensive and reasonable, and there is saving data resource, reduce the effect of the pressure of Wireless Data Transmission and data backup memory.
(3) the present invention is based on wireless transmit transmission system, sensor signal is sent to the service processor of far-end, after data processing and threshold decision, can dynamic deformation result be waited automatically to be sent to client, for artificial interference process overload; Carry out again the measurement instruction of on-the-spot high-frequency, high time resolution simultaneously to control sensor, obtain detailed data, be convenient to the grasp to dynamic time and analysis.
Accompanying drawing explanation
Fig. 1 is the basic composition figure of bridge state parameter Real-Time Monitoring of the present invention and warning system;
Fig. 2 is the fundamental diagram of bridge state parameter Real-Time Monitoring of the present invention and warning system primary controller;
Fig. 3 is the workflow diagram capturing camera in the present invention.
Reference numeral is: 1-GPS time service unit; 2-environmental detection sensor unit; 3-flow detection sensor unit; 4-structure detection sensor unit; 5-wireless data transmission unit; 6-capture camera; 7-on-the-spot primary controller; 11-bridge machinery sensor group; 12-remote service processor; 13-client.
Embodiment
Be described in more detail below in conjunction with the technical scheme of embodiment to this patent.
Refer to Fig. 1 and Fig. 2, the invention provides a kind of bridge state parameter Real-Time Monitoring and warning system, comprise bridge machinery sensor group 11, capture camera 6, on-the-spot primary controller 7, remote service processor 12 and client 13.
In the present invention, described bridge machinery sensor group 11 comprises environmental detection sensor unit 2, flow detection sensor unit 3 and structure detection sensor unit 4; Wherein, environmental detection sensor unit 2 comprises the one or more combination in temperature sensor, air velocity transducer, rain sensor; Flow detection sensor unit 3 comprises the one or more combination in ground propagated sensation sensor, infrared sensor, LOAD CELLS; Structure detection sensor unit 4 comprises the one or more combination in displacement transducer, strain transducer, vibration transducer.
In the present invention, described on-the-spot primary controller 7 comprises central control unit and the data acquisition unit be connected with central control unit, synchronous trigger control unit, on-site wireless data transmission unit 5 and GPS time service unit 1; Central control unit control data collecting unit obtains the data of bridge machinery sensor group 11 according to synchronous trigger control unit instruction acquisition, after data fusion being entered the time-tagging code of GPS time service unit 1, then transfer to remote service processor 12 through on-site wireless data transmission unit 5.
In the present invention, described data acquisition unit acquires obtains the sensing data of environmental detection sensor unit 2, flow detection sensor unit 3 and structure detection sensor unit 4.
In the present invention, the time-base signal that described synchronous trigger control unit provides according to GPS time service unit 1, and by the frequency set, the sensing data of synchronous trigger data acquisition unit to bridge machinery sensor group 11 gathers; Wherein the acquisition of precise time is realized by the output data of parsing GPS, also i.e. usually said time synchronized or time service.
In the present invention, described remote service processor 12 comprises far-end wireless data transmission unit and Data Management Analysis unit, after far-end wireless data transmission unit receives the data of on-site wireless data transmission unit 5 transmitting, analyzing and processing and examination is carried out by Data Management Analysis unit, the result exceeding activation threshold value is sent to client 13, steering order is sent to the central control unit of on-the-spot primary controller 7 through on-site wireless data transmission unit 5 simultaneously, to work and one or more groups sensor in bridge machinery sensor group 11 gathers bridge signal according to respective frequency of operation for controlling to capture camera 6.
In the present invention, described far-end wireless data transmission unit and on-site wireless data transmission unit are GPRS wireless transmitting system or 3G wireless transmitting system or 4G wireless transmitting system or RF wireless transmitting system.
In the present invention, described Data Management Analysis unit is used for analyzing sensing data, processing, and capture the judgement of camera 6 activation threshold value, and according to the time-base signal that GPS time service unit 1 provides, the view data of sensing data and candid photograph camera 6 is processed, and time-tagging code is added to the data after process, briefly add a timestamp to the file of image record exactly.
In the present invention, described client 13 is computer or the mobile intelligent terminal for data receiver.
Refer to Fig. 3, described candid photograph camera 6 is ccd sensor or cmos sensor, its workflow is: because the data volume of capturing camera 6 generation is large, in order to save wireless transmission flow and memory data output, under the bridge static deformation of normal conditions, image recording system does not work, and can save data resource like this; Carry out in processing procedure at Data Management Analysis unit to the sensing data of structure detection sensor unit 4, when the sudden change amplitude that sensing data occurs exceeds the threshold value preset, be judged as that bridge creates dynamic deformation, remote service processor 12 1 aspect sends alarm command to client 13, on the other hand instruction is sent to the central control unit of on-the-spot primary controller 7, drive candid photograph camera 6 to work, record is carried out to the general image of bridge; In addition, the time of origin of dynamic deformation relies on the sensing data of structure detection sensor unit 4 to judge; When the sudden change amplitude that the sensing data of structure detection sensor unit 4 occurs does not exceed the threshold value preset, when also namely parameter is tending towards normal, then captures camera 6 and stop video capture.
Same principle, under usual state, what the static measurement of bridge adopted is low time-resolved measurement, and that is the sampling rate of sensor is lower, can reduce that data store like this, the pressure of process and wireless transmission; In order to high time resolution when realizing bridge dynamic deformation is measured, when the Data Management Analysis element analysis of remote service processor 12 exceeds threshold value to any one sensing data of bridge machinery sensor group 11, remote service processor 12 1 aspect sends alarm command to client 13, on the other hand instruction is sent to the central control unit of on-the-spot primary controller 7, drives structure detection sensor unit 4 accelerates the frequency of signals collecting, to obtain detailed signal data.When the sudden change amplitude that the sensing data of structure detection sensor unit 4 occurs does not exceed the threshold value preset, when also namely parameter is tending towards normal, then captures camera 6 and stop video capture.
Carrying out in comprehensive recording process to the parameter of bridge, owing to have employed multiple sensors and capturing camera, can synchronous fusion in order to ensure follow-up many kinds of parameters data, carry out united analysis process.Data Management Analysis unit in processes, all add the time-tagging code obtained according to GPS time service unit 1, and export through GPRS wireless output terminal or 3G/4G wireless transmitting system, time reference has just been had like this, for data syn-chronization fusion, extraction and analysis provide conveniently in subsequent treatment with when analyzing.
Time mark code is as the frame head of sensing data, and be made up of 6 bytes, structure is as shown in the table:
Wherein, BYTE0 ~ BYTE3 is the number of seconds from 0: 0: 0 on the 1st January of 1900 Greenwich Mean Time (0 time zone), and BYTE4 ~ BYTE5 is millisecond number.
Because image recorded data amount is larger, the packet of several band bag sequence numbers is split into according to the size of often wrapping 128 bytes, wherein time tag information is positioned in the first bag data, be sent to remote service processor 12 successively, by remote service processor 12, the data packet group that receives is synthesized picture file of taking pictures, and by the time tag information write into Databasce of pictorial information and picture of taking pictures.
The present invention adopts advanced displacement transducer, obtain the amount of deflection parameter under high-precision bridge load, again in conjunction with sensing data and image and the synchronous fusion technology of capturing camera 6 of other structure detection sensor units 3, effectively ensure the safety of bridge, there is great promotional value.
In the present invention, the displacement transducer in described structure detection sensor unit 4 can adopt the remote displacement sensor be arranged on bridge, and strain transducer can adopt fiber Bragg grating strain sensor, and vibration transducer can adopt the sensor of electromagnetic principle.Need in actual applications to carry out on-site proving in advance, and set appropriate parameter threshold, judgement for parameter threshold can be considered according to the comprehensive magnitude of the data of a certain particular sensor or several sensing data, and through verification experimental verification (this is the common practise of those skilled in the art).
The present invention is by set environment detection sensor unit 2, flow detection sensor unit 3 and structure detection sensor unit 4 on bridge and the candid photograph camera 6 for the monitoring of integral bridge pattern, achieve the comprehensive record to bridge parameter, time synchronized control treatment is carried out to each sensor and camera simultaneously, for data add time mark, ensure that the reliability of data; In addition by judging the signal threshold value of structure detection sensor unit 4, identifying dynamic deformation event, controlling to capture camera 6, achieving the warning to client 13 simultaneously, achieve the complete documentation to time burst and human intervention control.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art possesses, can also makes a variety of changes under the prerequisite not departing from this patent aim.
Claims (10)
1. bridge state parameter Real-Time Monitoring and a warning system, is characterized in that, comprises bridge machinery sensor group (11), captures camera (6), on-the-spot primary controller (7), remote service processor (12) and client (13);
Described bridge machinery sensor group (11) comprises environmental detection sensor unit (2), flow detection sensor unit (3) and structure detection sensor unit (4);
Described on-the-spot primary controller (7) comprises central control unit and the data acquisition unit be connected with central control unit, synchronous trigger control unit, on-site wireless data transmission unit (5) and GPS time service unit (1); Central control unit control data collecting unit obtains the data of bridge machinery sensor group (11) according to synchronous trigger control unit instruction acquisition, after data fusion being entered the time-tagging code of GPS time service unit (1), then transfer to remote service processor (12) through on-site wireless data transmission unit (5);
Described remote service processor (12) comprises far-end wireless data transmission unit and Data Management Analysis unit, after far-end wireless data transmission unit receives the data that on-site wireless data transmission unit (5) launches, analyzing and processing and examination is carried out by Data Management Analysis unit, the result exceeding activation threshold value is sent to client (13), steering order is sent to the central control unit of on-the-spot primary controller (7) through on-site wireless data transmission unit (5) simultaneously, bridge signal is gathered according to respective frequency of operation for controlling one or more groups sensor captured in camera (6) work and bridge machinery sensor group (11).
2. bridge state parameter Real-Time Monitoring according to claim 1 and warning system, it is characterized in that, the workflow of described candid photograph camera (6) is: carry out in processing procedure at the sensing data of Data Management Analysis unit to structure detection sensor unit (4), when the sudden change amplitude that sensing data occurs exceeds the threshold value preset, be judged as that bridge creates dynamic deformation, remote service processor (12) sends alarm command on the one hand client (13), on the other hand instruction is sent to the central control unit of on-the-spot primary controller (7), drive and capture camera (6) work, record is carried out to the general image of bridge, in addition, the time of origin of dynamic deformation relies on the sensing data of structure detection sensor unit (4) to judge, when the sudden change amplitude that the sensing data of structure detection sensor unit (4) occurs does not exceed the threshold value preset, when also namely parameter is tending towards normal, then captures camera (6) and stop video capture.
3. bridge state parameter Real-Time Monitoring according to claim 1 and 2 and warning system, it is characterized in that, when the Data Management Analysis element analysis of remote service processor (12) exceeds threshold value to any one sensing data of bridge machinery sensor group (11), remote service processor (12) sends alarm command on the one hand client (13), send instruction to the central control unit of on-the-spot primary controller (7) on the other hand, drives structure detection sensor unit (4) accelerates the frequency of signals collecting.
4. bridge state parameter Real-Time Monitoring according to claim 3 and warning system, it is characterized in that, the time-base signal that described synchronous trigger control unit provides according to GPS time service unit (1), and by the frequency set, the sensing data of synchronous trigger data acquisition unit to bridge machinery sensor group (11) gathers.
5. the bridge state parameter Real-Time Monitoring according to claim 1 or 2 or 4 and warning system, it is characterized in that, described Data Management Analysis unit is used for analyzing sensing data, processing, and capture the judgement of camera (6) activation threshold value, and according to the time-base signal that GPS time service unit (1) provides, the view data of sensing data and candid photograph camera (6) is processed, and time-tagging code is added to the data after process.
6. bridge state parameter Real-Time Monitoring according to claim 5 and warning system, is characterized in that, described time mark code, as the frame head of sensing data, is made up of 6 bytes.
7. the bridge state parameter Real-Time Monitoring according to claim 1 or 2 or 6 and warning system, is characterized in that, described environmental detection sensor unit (2) comprises the one or more combination in temperature sensor, air velocity transducer, rain sensor; Flow detection sensor unit (3) comprises the one or more combination in ground propagated sensation sensor, infrared sensor, LOAD CELLS; Structure detection sensor unit (4) comprises the one or more combination in displacement transducer, strain transducer, vibration transducer.
8. bridge state parameter Real-Time Monitoring according to claim 7 and warning system, it is characterized in that, institute's displacement sensors adopts the remote displacement sensor be arranged on bridge, and strain transducer adopts fiber Bragg grating strain sensor, and vibration transducer adopts the sensor of electromagnetic principle.
9. the bridge state parameter Real-Time Monitoring according to claim 1 or 2 or 6 or 8 and warning system, is characterized in that, described candid photograph camera (6) is ccd sensor or cmos sensor; Described client (13) is computer or the mobile intelligent terminal for data receiver.
10. bridge state parameter Real-Time Monitoring according to claim 9 and warning system, it is characterized in that, described far-end wireless data transmission unit and on-site wireless data transmission unit are GPRS wireless transmitting system or 3G wireless transmitting system or 4G wireless transmitting system or RF wireless transmitting system.
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| CN106225681A (en) * | 2016-07-25 | 2016-12-14 | 肖锐 | A kind of Longspan Bridge health status monitoring device |
| CN106908807A (en) * | 2017-02-28 | 2017-06-30 | 清华大学 | Pseudo-code modulates navigator fix and deformation monitoring, monitoring terminal, monitoring center, navigation neceiver and code control data corporation |
| CN107328537A (en) * | 2017-08-28 | 2017-11-07 | 周雷 | The detection method of modularization steel bridge structure of main bridge |
| CN107843284A (en) * | 2017-10-20 | 2018-03-27 | 成都上甲光电科技有限公司 | It is a kind of can real-time display bridge security state monitoring system |
| CN107990821A (en) * | 2017-11-17 | 2018-05-04 | 深圳大学 | A kind of bridge deformation monitoring method, storage medium and bridge deformation monitoring receiver |
| CN108898292A (en) * | 2018-06-14 | 2018-11-27 | 合肥市城市生命线工程安全运行监测中心 | A kind of safety evaluation method of bridge health state |
| CN109443517A (en) * | 2018-09-13 | 2019-03-08 | 东南大学 | For measuring the wireless 4G noise transducer and method for sensing of bridge floor speed |
| CN110455207A (en) * | 2019-07-18 | 2019-11-15 | 嘉兴同禾传感技术有限公司 | Bridge beam slab cuts with scissors gap-like state online recognition device and its application method |
| CN112445192A (en) * | 2020-11-20 | 2021-03-05 | 河南交通职业技术学院 | Automatic road and bridge control method and system |
| CN112458890A (en) * | 2020-11-20 | 2021-03-09 | 四川新路桥特种技术工程有限公司 | Bridge expansion device and support remote real-time monitoring system and method |
| CN113008154A (en) * | 2021-02-26 | 2021-06-22 | 中煤科工集团重庆研究院有限公司 | Optical fiber sensing system for bridge safety monitoring |
| CN113532290A (en) * | 2021-09-07 | 2021-10-22 | 江苏中云筑智慧运维研究院有限公司 | Bridge displacement monitoring system based on fusion of area distribution sensing and DIC (digital image computer) technology |
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| CN106225681A (en) * | 2016-07-25 | 2016-12-14 | 肖锐 | A kind of Longspan Bridge health status monitoring device |
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| CN107990821A (en) * | 2017-11-17 | 2018-05-04 | 深圳大学 | A kind of bridge deformation monitoring method, storage medium and bridge deformation monitoring receiver |
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| CN109443517A (en) * | 2018-09-13 | 2019-03-08 | 东南大学 | For measuring the wireless 4G noise transducer and method for sensing of bridge floor speed |
| CN110455207A (en) * | 2019-07-18 | 2019-11-15 | 嘉兴同禾传感技术有限公司 | Bridge beam slab cuts with scissors gap-like state online recognition device and its application method |
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| CN112458890A (en) * | 2020-11-20 | 2021-03-09 | 四川新路桥特种技术工程有限公司 | Bridge expansion device and support remote real-time monitoring system and method |
| CN113008154A (en) * | 2021-02-26 | 2021-06-22 | 中煤科工集团重庆研究院有限公司 | Optical fiber sensing system for bridge safety monitoring |
| CN113008154B (en) * | 2021-02-26 | 2022-10-14 | 中煤科工集团重庆研究院有限公司 | Optical fiber sensing system for bridge safety monitoring |
| CN113532290A (en) * | 2021-09-07 | 2021-10-22 | 江苏中云筑智慧运维研究院有限公司 | Bridge displacement monitoring system based on fusion of area distribution sensing and DIC (digital image computer) technology |
| CN113532290B (en) * | 2021-09-07 | 2021-12-03 | 江苏中云筑智慧运维研究院有限公司 | Bridge displacement monitoring system based on fusion of area distribution sensing and DIC (digital image computer) technology |
| CN115628766A (en) * | 2022-09-07 | 2023-01-20 | 北京云庐科技有限公司 | Time calibration method and device for bridge monitoring data and electronic equipment |
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Application publication date: 20151209 |