CN202693117U - Bridge amplitude real-time monitoring device based on laser modulation - Google Patents
Bridge amplitude real-time monitoring device based on laser modulation Download PDFInfo
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- CN202693117U CN202693117U CN 201220228273 CN201220228273U CN202693117U CN 202693117 U CN202693117 U CN 202693117U CN 201220228273 CN201220228273 CN 201220228273 CN 201220228273 U CN201220228273 U CN 201220228273U CN 202693117 U CN202693117 U CN 202693117U
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Abstract
The utility model relates to the technique of bridge monitoring. The utility model discloses a bridge amplitude real-time monitoring device based on laser modulation. The technical scheme of the utility model is as follows: the bridge amplitude real-time monitoring device based on laser modulation comprises a laser emission system, a laser receiving system, a signal processing and control system and a target, wherein the target is rigidly fixed on a bridge; the laser emission system is electrically connected with the signal processing and control system; the laser is emitted to the target according to instructions of the signal processing and control system; the laser receiving system receives the laser reflected by the target; the laser receiving system converts the received laser into electric signals; the signal processing and control system is connected with the laser receiving system so as to receive the electric signals output by the laser receiving system; and the signal processing and control system processes the received electric signals and calculates bridge amplitude data. The laser modulation-based bridge amplitude real-time monitoring device is mainly used for real-time dynamic and static monitoring of the amplitudes of large bridges.
Description
Technical field
The utility model relates to the bridge monitoring technology, be particularly related to a kind of employing Laser Detection Technique, non-contacting measuring method and bridge amplitude (vertical and horizontal) carried out the system of in real time dynamic (vehicle operating or other load are arranged) and static (without vehicle operating or other load, bridge self-vibration) monitoring.
Background technology
At the society of rapid economic development, civil engineering structure miscellaneous, such as bridge, heavy construction etc., they are bringing into play extremely important effect in social life.Bridge is the important component part of transportation network, in national economy life in occupation of consequence.Whether bridge can be directly connected to country and the people's lives and property safety by safe operation, therefore must assess the safety case of bridge.In recent years, engineering research person has carried out the evaluation work of bridge security state, and has made great progress from the parameter monitoring of bridge.Such as the actual monitoring research of the U.S. to the I-40 bridge, Denmark is intended to check crucial design parameter and obtains the necessary required record of bridge inspection and maintenance Fare oblique pull Bridge Construction stage over strait and the first year monitoring etc. that is open to traffic.In recent years, the bridge collapse accident occurs again and again, and the economic loss that causes thus is difficult to estimate, if in advance bridge is taked the safety assessment measure then can greatly reduce casualties and economic loss.
In more than ten years in past, China builds a collection of Longspan Bridge, and only Shanghai just has Nanpu, Yangpu and Xu Pu bridge etc. to have world-class bridge.In addition, the Tsing Ma Bridge in Hong Kong and the Humen Bridge at the Humen are again the suspension bridges that China sets up first, in recent years China particularly the coastland transport development is rapid, in the urgent need to setting up large quantities of Longspan Bridges.Costly in order to ensure these, with the safety durable of the closely-related bridge of national economy, the safety assessment of these bridges being carried out real-time continuous is very necessary.
Just because of this, the safety assessment of bridge more and more comes into one's own, and many researchists are being devoted to the safety assessment research of bridge, and the safety assessment of bridge becomes a very active research direction in the civil engineering work subject just day by day.Amplitude is as one of key parameter of bridge security assessment, the safety of bridge had a great impact, and be requisite in the bridge parameter monitoring to the measurement of amplitude.Engineering circles has the method for many amplitude measurements, but all is difficult to satisfy on-the-spot requirement of measuring in real time.Recently the speckle imaging method that occurs both at home and abroad, strain measurement method etc. are improved the method for old amplitude measurement, but also exist slow such as picking rate, real-time is poor, inconvenience and the shortcoming such as computer interface, in practical engineering application, often be very restricted.
Longspan Bridge is subjected to wind load, vehicular load, temperature and earthquake effect larger, and in the coastland generally without earthquake, mainly be subjected to the impact of typhoon, vehicle and temperature, for guaranteeing bridge safe operation under these conditions, must study bridge actual amplitude curve under these conditions, and at present only be confined to theory and model experiment for the research of wind load and bridge amplitude, also insufficient for the research of actual bridge under the wind effect; The research of vehicular load and bridge amplitude is also just carried out under special time and space.Main cause is the testing tool unreasonable structure, can not continuous real-time monitoring for large bridge.The technological means that is used at present the amplitude monitoring both at home and abroad mainly contains: fiber-optic grating sensor, total powerstation, displacement transducer, acceleration transducer and laser testing method.
Fiber-optic grating sensor is a kind of contact type sensor, the leading products of releasing in recent years both at home and abroad, need to be embedded in the bridge plate in the bridge construction process, its maximum defective is that fiber grating fractures after heavy vehicle rolls easily, and helpless to built bridge.
What Shanghai Yangpu Bridge just adopted is total powerstation point by point scanning method, and each measuring point is carried out the 7s continuous sweep in one week, and its shortcoming is that the asynchronous and deflection of each measuring point can not be surveyed when large.
Displacement transducer also is a kind of contact type sensor, must contact with measuring point, its shortcoming be for be difficult to that the points of proximity can't be measured and to lateral amplitude of vibration measurement have any problem.
Acceleration transducer is a kind of contact type sensor equally, and is poor for the static amplitude identification result of low frequency, and for obtaining must to carry out twice integration when amplitude data calculates, precision is not high, can't monitor in fact yet.And the vibration frequency of large bridge is generally all lower, and the acceleration transducer monitoring effect is had a greatly reduced quality.
For bridge is carried out safety assessment, must seek better method of testing.The technology that the most emerging GPS of utilization tests has been carried out field test at bridge and skyscraper.Shenzhen emperor's mansion, the Tsing Ma Bridge to Hong Kong in 1998 carried out experimental study in 1996.Particularly carried out real bridge at the Humen bridge in 1999 and tested, worked at present.External dodson, A.H, 1997; Brown, G.J, 1999 also utilize GPS that structure is monitored, and have obtained success.Representative GPS RTK differential system is comprised of base station, monitoring station and communication system.Base station is delivered to the monitoring station with the satellite difference information that receives in real time through optical fiber.Monitoring station receiving satellite signal and GPS base station information carry out can recording behind the real time differential real-time three-dimensional volume coordinate of website.This result delivers to Surveillance center, and Surveillance center carries out bridge amplitude, corner calculating according to the real-time three-dimensional volume coordinate information of website, provides bridge administrative authority to carry out safety analysis.But the precision of GPS monitoring bridge amplitude is not high, and general precision is about 20mm.
(publication number: CN101315274A discloses day to Chinese patent: the technology that 2008.12.03) discloses the displacement of a kind of laser monitoring bridge vibration.This patent adopts traditional the method for photoelectric imaging, by a plurality of laser pick-off website synchronous acquisition laser imaging hot spots of arranging along bridge, calculates bridge vertical and horizontal displacements (amplitude) according to the displacement of imaging facula.The major defect of this patented technology is, optical system structure is complicated, and measuring accuracy is low, and the amplitude range of measurement is very limited, can not effectively monitor the large amplitude of large bridge.
The utility model content
Technical problem to be solved in the utility model just provides a kind of bridge amplitude real-time monitoring device based on Laser Modulation, improves large bridge amplitude monitoring accuracy and monitoring range, for the safe operation of bridge provides data.
The utility model solve the technical problem, the technical scheme that adopts is, bridge amplitude real-time monitoring device based on Laser Modulation, comprise laser transmitting system, laser receiver system, signal is processed and control system, it is characterized in that, also comprise target, described target is rigidly fixed on the bridge, described laser transmitting system processes with signal and control system is electrically connected, according to signal process and the instruction of control system to described target Emission Lasers, described laser receiver system receives the laser of described target reflection, described laser receiver system is converted to electric signal with the laser that receives, described signal processing and control system are connected the electric signal that receives its output with laser receiver system, described signal is processed and control system is processed the electric signal that receives, and calculates the bridge amplitude data.
Concrete, described target is the part of bridge rigid structure.
Further, described laser transmitting system is to the continuous or quasi-continuous lasing of described target emission.
Concrete, described laser receiver system comprises optical receiver, planar array detector and modulator-demodular unit, described optical receiver receives the laser of target reflection, described planar array detector is connected with optical receiver, the laser signal of optical receiver output is converted to the electric signal incoming modem, described modulator-demodular unit to signal process and control system output demodulation after the electric signal that contains amplitude information.
Further, it is characterized in that, also comprise threshold value decision device and warning system, described threshold value decision device processes with signal and control system is connected, described warning system is connected with the threshold value decision device, described threshold value decision device judges that according to the comparative result of amplitude data and setting threshold the trigger alarm system sends alerting signal when amplitude bridge amplitude surpasses setting.
Further, also comprise the video monitoring system for monitoring bridge floor load, described video monitoring system receives the instruction of signal processing and control system, gathers the bridge floor information on load and be transferred to signal to process and control system.
Concrete, the bridge floor information on load that described signal processing and control system real-time analysis bridge amplitude data and video monitoring system gather, the dynamic and static trend curve of generation bridge amplitude variations is for the bridge security assessment provides foundation.
The beneficial effects of the utility model are to adopt Laser Detection Technique, non-contacting measuring method that bridge vertical and horizontal amplitude is carried out in real time dynamically (vehicle operating or other load are arranged) and static (without vehicle operating or other load, bridge self-vibration) monitoring.Have round-the-clock, high precision, high resolving power (can reach the mm magnitude) and online real-time and be not subjected to the characteristics such as mounting condition restriction.The utility model can also be captured real-time bridge amplitude and combine with the video monitoring system location, by technology such as car plate record, image recognitions, consist of powerful detect take real-time bridge amplitude attitude monitoring as core, vehicle overload and the license plate number automatic identification function is monitored and amplitude superthreshold warning system for the online bridge amplitude of laser auxiliary, that be used for the bridge security assessment.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the structural representation of embodiment.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
The utility model is based on the bridge amplitude real-time monitoring device of Laser Modulation, with continuous or quasi-continuous laser projection to target, because target and bridge are rigidly connected, perhaps target itself is exactly the part of bridge rigid structure, any vibration of bridge (comprising transverse vibration and extensional vibration) all can produce modulating action to the laser that projects on the target, thereby the laser Portable belt of target reflection the information of bridge vibration, just can collect important physical parameter---the amplitude of bridge vibration by the laser of receiving demodulation target reflection.The continuous laser of duration 〉=0.25s or the quasi-continuous lasing of laser pulse repetition frequency＞1kHz are adopted in practical application usually, just can demodulate the bridge amplitude data from modulated laser.
As shown in Figure 1, the utility model comprises laser transmitting system, laser receiver system, signal processing and control system and target based on the bridge amplitude real-time monitoring device of Laser Modulation.Target can be the part of bridge rigid structure, such as the part of bridge crossbeam steel construction, improves after treatment the target that laser reflectivity just can be used as reflector laser.Perhaps adopt special laser reflection device, be generally sheet metal (or optical reflector) through special processing etc., by rigid connector target is rigidly fixed on the bridge.Among Fig. 1, laser transmitting system processes with signal and control system is electrically connected, instruction according to signal processing and control system is launched continuously or quasi-continuous lasing to target, this laser is reflected away by target after being modulated by bridge vibration, laser receiver system receives the laser of target reflection, for electric signal and carry out obtaining comprising after modulation /demodulation is processed the data-signal of bridge amplitude information, this data-signal is admitted to signal and processes and control system with it.Process after signal processing and control system receive described data-signal, calculate the bridge amplitude data.This amplitude data can provide foundation for the bridge security early warning, and the bridge floor load data (mainly being carload) that also can gather in conjunction with video monitoring system provides early warning or provides foundation to the divisions of responsibility can of bridge security accident the bridge security accident.
Embodiment
This example is based on the bridge amplitude real-time monitoring device structure of Laser Modulation, as shown in Figure 2.Comprise laser transmitting system, laser receiver system, signal processing and control system, target, threshold value decision device, warning system, and the video monitoring system that is used for monitoring bridge floor load.This routine laser receiver system is made of optical receiver, planar array detector and modulator-demodular unit.This routine laser transmitting system can adopt the Solid State Laser emission coefficient of technology maturation.Laser transmitting system and laser receiver system can be configured in the same rack, and are electrically connected with signal processing and control system by cable.Laser transmitting system and laser receiver system should be installed in away from the bridge place, as on the firm platform in bank or in the machine room, are not subjected to the impact of bridge vibration.After should making the laser process target reflection of laser transmitting system emission during installation, effectively received by laser receiver system.In the mounting structure as shown in Figure 2, the emitting head of laser transmitting system and optical receiver all with target over against installation, incident laser is all vertical with the target reflecting surface with reflector laser, this configuration mode just can receive reflected light effectively.Also can be for different bridge structures and target position, according to reflection of light law configuration emitting head and optical receiver, this configuration mode laser transmitting system and laser receiver system adopt the mode of configured separate usually.
As shown in Figure 2, this routine target is the special laser reflection device that is rigidly fixed on the bridge, is the metal reflective plate through special processing, adopts rigid connector to be fixed on the bridge.Among Fig. 2, laser transmitting system processes with signal and control system is electrically connected, and launches continuous laser according to the instruction of signal processing and control system to target, and this laser projection is reflected away by target after the bridge vibration modulation to target.Optical receiver receives the laser of target reflection through optical processing input face array detector, and planar array detector is converted into the electric signal incoming modem after receiving laser signal.Modulator-demodular unit receives the electric signal of planar array detector output, carries out obtaining comprising after the demodulation process data-signal of bridge amplitude information, and this data-signal is admitted to signal and processes and control system.Process behind signal processing and the control system reception of data signal, calculate the bridge amplitude data.This amplitude data one tunnel input threshold value decision device compares judgement with the amplitude threshold of setting, and when the amplitude data that calculates surpassed setting threshold, threshold value decision device output trigger pip was to warning system, and warning system is sent sound and light alarm.This example is based on the bridge amplitude real-time monitoring device of Laser Modulation, signal is processed and control system also is connected with video monitoring system by cable, the bridge floor load data that can gather in conjunction with video monitoring system provides early warning or provides foundation to the divisions of responsibility can of bridge security accident the bridge security accident.Such as large when the bridge amplitude or when equaling setting value, signal is processed and control system output control signal, start video monitoring system Real-time Collection bridge floor vehicular traffic this moment image information, and number plate of vehicle recorded and identify, just can be to the vehicle that causes the bridge amplitude the to exceed standard punishment of being correlated with, perhaps order its Reduced Speed Now to reduce impact to bridge.Signal is processed and control system can also real-time analysis bridge amplitude data and the bridge floor information on load that gathers of video monitoring system, generates dynamic (load is arranged) and static state (no-load) trend curve of bridge amplitude variations, and assessing for bridge security provides foundation.
Claims (6)
1. based on the bridge amplitude real-time monitoring device of Laser Modulation, comprise laser transmitting system, laser receiver system, signal is processed and control system, it is characterized in that, also comprise target, described target is rigidly fixed on the bridge, described laser transmitting system processes with signal and control system is electrically connected, according to signal process and the instruction of control system to described target Emission Lasers, described laser receiver system receives the laser of described target reflection, described laser receiver system is converted to electric signal with the laser that receives, described signal processing and control system are connected the electric signal that receives its output with laser receiver system, described signal is processed and control system is processed the electric signal that receives, and calculates the bridge amplitude data.
2. the bridge amplitude real-time monitoring device based on Laser Modulation according to claim 1 is characterized in that described target is the part of bridge rigid structure.
3. the bridge amplitude real-time monitoring device based on Laser Modulation according to claim 1 is characterized in that, described laser transmitting system is to the continuous or quasi-continuous lasing of described target emission.
4. the bridge amplitude real-time monitoring device based on Laser Modulation according to claim 1, it is characterized in that, described laser receiver system comprises optical receiver, planar array detector and modulator-demodular unit, described optical receiver receives the laser of target reflection, described planar array detector is connected with optical receiver, the laser signal of optical receiver output is converted to the electric signal incoming modem, described modulator-demodular unit to signal process and control system output demodulation after the electric signal that contains amplitude information.
5. the bridge amplitude real-time monitoring device based on Laser Modulation according to claim 1, it is characterized in that, also comprise threshold value decision device and warning system, described threshold value decision device processes with signal and control system is connected, described warning system is connected with the threshold value decision device, described threshold value decision device judges that according to the comparative result of amplitude data and setting threshold the trigger alarm system sends alerting signal when amplitude bridge amplitude surpasses setting.
6. the bridge amplitude real-time monitoring device based on Laser Modulation according to claim 1, it is characterized in that, also comprise the video monitoring system for monitoring bridge floor load, described video monitoring system receives the instruction of signal processing and control system, gathers the bridge floor information on load and also is transferred to signal processing and control system.
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| CN 201220228273 CN202693117U (en) | 2012-05-21 | 2012-05-21 | Bridge amplitude real-time monitoring device based on laser modulation |
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| CN 201220228273 CN202693117U (en) | 2012-05-21 | 2012-05-21 | Bridge amplitude real-time monitoring device based on laser modulation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424175A (en) * | 2012-05-21 | 2013-12-04 | 成都星聚能科技有限公司 | Bridge amplitude real-time monitoring device based on laser modulation |
| CN104457851A (en) * | 2014-12-08 | 2015-03-25 | 黑龙江八一农垦大学 | Civil engineering structure healthy state remote monitoring system |
| CN104614064A (en) * | 2015-02-13 | 2015-05-13 | 福州大学 | High speed multi-dimensional vibration measuring device and method based on stripe target |
| CN107860537A (en) * | 2017-10-18 | 2018-03-30 | 成都上甲光电科技有限公司 | A kind of orientation, the adjustable laser amplitude instrument mounting seat of pitching |
| CN110823104A (en) * | 2019-12-13 | 2020-02-21 | 大连理工大学 | Tool component key area displacement field prediction method based on strain monitoring |
-
2012
- 2012-05-21 CN CN 201220228273 patent/CN202693117U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424175A (en) * | 2012-05-21 | 2013-12-04 | 成都星聚能科技有限公司 | Bridge amplitude real-time monitoring device based on laser modulation |
| CN104457851A (en) * | 2014-12-08 | 2015-03-25 | 黑龙江八一农垦大学 | Civil engineering structure healthy state remote monitoring system |
| CN104614064A (en) * | 2015-02-13 | 2015-05-13 | 福州大学 | High speed multi-dimensional vibration measuring device and method based on stripe target |
| CN104614064B (en) * | 2015-02-13 | 2018-01-12 | 福州大学 | A kind of high-speed multi-dimension degree vibration measurement device and method based on striped target |
| CN107860537A (en) * | 2017-10-18 | 2018-03-30 | 成都上甲光电科技有限公司 | A kind of orientation, the adjustable laser amplitude instrument mounting seat of pitching |
| CN110823104A (en) * | 2019-12-13 | 2020-02-21 | 大连理工大学 | Tool component key area displacement field prediction method based on strain monitoring |
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Granted publication date: 20130123 Termination date: 20190521 |