CN103644973A - Method, device and system for monitoring pavement temperature information of steel structure bridge - Google Patents
Method, device and system for monitoring pavement temperature information of steel structure bridge Download PDFInfo
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- CN103644973A CN103644973A CN201310699920.2A CN201310699920A CN103644973A CN 103644973 A CN103644973 A CN 103644973A CN 201310699920 A CN201310699920 A CN 201310699920A CN 103644973 A CN103644973 A CN 103644973A
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Abstract
The invention discloses a method, a device and a system for monitoring the pavement temperature information of a steel structure bridge. The temperature information of the surface of the steel structure bridge is measured by a non-contact temperature measuring method and accordingly the real-time monitoring on the pavement temperature of the bridge and the temperature change trend within a set time period can be achieved, the accurate measurement is achieved, and the pavement temperature and the temperature change within the set time period can be obtained simultaneously. The temperature measuring speed is high, the temperature can be determined in a short time as long as the infrared radiation of a target is received, and the accuracy is high.
Description
Technical field
The present invention relates to steel structure bridge pavement temperature information monitoring field, relate in particular to method, the Apparatus and system of monitoring steel structure bridge pavement temperature information.
Background technology
Bridge health monitoring system is a kind of complete real time on-line monitoring system of the structural health situation between the whole operating period of bridge and performance being monitored by various types of sensors are installed at the inner key position of bridge.As the subsystem of health monitoring, pavement temperature monitoring is extremely important to the operation of steel structure bridge and maintenance, in order to guarantee the intact of the operation security of bridge and road surface, needs the pavement temperature of Real-Time Monitoring bridge.In different temperature, need to take different measures to carry out maintenance of surface.Normal conditions, especially, in high temperature or severe cold situation, the upper bridge of need to sending someone carries out pavement temperature test, and for maintenance of surface makes a policy, intact to guarantee operation security and road surface.Be exactly concretely to take cooling measure at pavement temperature during higher than predetermined temperature, to protect road surface to be without prejudice; When being below the freezing point, takes pavement temperature non-skid feature, in case driving accident appears in traffick.Steel structure bridge is different from common bridge, bridge floor adopts high-performance epoxy asphalt pavement material, the layer of mating formation is very thin, road surface cannot be buried temperature sensor underground, cause adopting traditional thermometric mode to measure the temperature of steel structure bridge, with regard to needing, adopt the method that does not contact road surface to carry out pavement temperature measurement.The Real-Time Monitoring of wherein realizing temperature Real-Time Monitoring and temperature changing trend is difficult to synchronously complete.
Because the defect that above-mentioned existing steel structure bridge pavement temperature monitoring exists, the inventor is based on being engaged in this type of product design manufacture abundant practical experience and professional knowledge for many years, and the utilization of cooperation scientific principle, positive research and innovation in addition, to founding a kind of method, Apparatus and system of novel monitoring steel structure bridge pavement temperature information, make it have more practicality.Through constantly research, design, and after repeatedly studying sample and improving, finally create the present invention who has practical value.
Summary of the invention
Fundamental purpose of the present invention is to propose a kind of method of monitoring steel structure bridge pavement temperature information, by method of the present invention, realizes Real-Time Monitoring steel structure bridge pavement temperature information.
Another object of the present invention is to propose a kind of system of monitoring the device of steel structure bridge pavement temperature information and applying this device.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of method of monitoring steel structure bridge pavement temperature information proposing according to the present invention, be applied to the hardware platform based on thermal infrared imager, the described hardware platform based on thermal infrared imager comprises optical lens group, photoelectric commutator and microprocessor, and the method comprises:
By thermal infrared imager, obtain the infrared light that send on road surface, and the infrared light described road surface being sent by described optical lens group carries out pre-service and obtains light signal;
According to described light signal, by described photoelectric commutator, obtain electric signal;
According to described electric signal, by microprocessor, obtain pavement temperature information, and described pavement temperature information is uploaded to control center, control center applies accordingly according to the pavement temperature information realization of uploading;
Described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
Concrete, the method for aforesaid monitoring steel structure bridge pavement temperature information, the infrared light described road surface being sent by described optical lens group carries out pre-service, specifically comprises:
The infrared light that road pavement is sent carries out filtering interfering and focuses on processing, and obtains light signal.
Concrete, the method for aforesaid monitoring steel structure bridge pavement temperature information, obtains electric signal by described photoelectric commutator, specifically comprises:
The light signal obtaining drops on described photoelectric commutator, and photoelectric commutator is converted to electric signal by corresponding light signal.
Concrete, the method for aforesaid monitoring steel structure bridge pavement temperature information, obtains pavement temperature information by microprocessor, specifically comprises:
The electric signal obtaining is compared by the corresponding temperature data that set in advance in data algorithm and described microprocessor, then after target transmit power is proofreaied and correct, obtain corresponding target temperature value, and data are sent to control center;
The electric signal obtaining is changed to corresponding data by the pavement temperature in the setting-up time section setting in advance in data algorithm and described microprocessor to be compared, again after target transmit power is proofreaied and correct, obtain the pavement temperature value in corresponding setting-up time section, and data are sent to control center.
Monitor a device for steel structure bridge pavement temperature information, comprise thermal infrared imager, optical lens group, photoelectric commutator and microprocessor; Wherein,
Described thermal infrared imager, the infrared light sending for gathering road surface;
Described optical lens group, the infrared light sending for road pavement carries out filtering interfering and focuses on processing, and obtains light signal;
Described photoelectric commutator, for being converted to electric signal by described light signal;
Described microprocessor, for described electric signal is converted to pavement temperature information, described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
A control center, comprising:
Processing unit, for applying accordingly according to described pavement temperature information realization, described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
A system of monitoring steel structure bridge pavement temperature information, comprising:
The device of monitoring steel structure bridge pavement temperature, for gathering the infrared light that send on road surface, the infrared light gathering carries out filtering interfering and focuses on to process obtaining light signal, described light signal obtains electric signal through photoelectric commutator, according to described electric signal, obtain pavement temperature information, and described pavement temperature information is uploaded to control center;
Control center, for according to described pavement temperature information realization respective application;
Described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
By technique scheme, method, Apparatus and system that the present invention monitors steel structure bridge pavement temperature information at least have following advantages:
The present invention adopts non-contact measurement, does not need to touch inside or the surface of dut temperature field, can not disturb the state of dut temperature field, and temperature measurer itself is not subject to the damage in temperature field yet; Measurement range is wide; Long transmission distance, is applicable to long-term on-line monitoring, and the data that monitor can long-distance transmissions be taken office the place of what is the need for and wanting; Thermometric speed is fast, as long as receive the infrared radiation of target, can within the extremely short time, determine temperature; Accuracy is high, and infrared measurement of temperature can equally with contact temperature-measuring not destroy object self-temperature and distribute, so measuring accuracy is high; Highly sensitive, as long as object temperature has subtle change, emittance just has larger change, is easy to measure; Can also realize the synchro measure of the pavement temperature change information in road surface real time temperature information and setting-up time section.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention, is described in detail as follows.
figure of description
Fig. 1 is that the present invention monitors steel structure bridge pavement temperature information system structure schematic diagram;
Fig. 2 is thermal infrared imager scheme of installation;
Fig. 3 embodiment Bridge 1 beam middle and upper reaches pavement temperature variation tendency;
Fig. 4 embodiment Bridge 1 beam middle and lower reaches pavement temperature variation tendency;
Fig. 5 embodiment Bridge 2 beam road surface (steel case beam upper surface) temperature changing trend;
Fig. 6 bridge pavement (steel case beam is inner) temperature changing trend;
Fig. 7 air (steel case beam is inner) temperature changing trend;
Fig. 8 STRESS VARIATION trend.
Embodiment
For further setting forth the present invention, reach technological means and the effect that predetermined goal of the invention is taked, method, its embodiment of Apparatus and system, feature and effect thereof to the monitoring steel structure bridge pavement temperature information proposing according to the present invention, be described in detail as follows.
The selection of thermal infrared imager:
Thermal infrared imager is to survey infrared energy (heat) by noncontact, and is converted into electric signal, so on equipment Heat of Formation image and temperature value, and a kind of checkout equipment that can calculate temperature value.
Infrared ray is the electromagnetic wave of wavelength 0.78～1000 μ m.Any object higher than absolute temperature zero degree is all infrared origin, when the temperature of object is during higher than absolute zero, due to the existence of its internal heat motion, will be constantly to surrounding radiated electromagnetic wave, thermal infrared imager daytime, night produce infrared origin, therefore all can work.Thermal infrared imager temperature resolution is up to 0.1～0.02 ℃, and the precision of Detect change temperature is high; Temperature-measuring range-50～2000 ℃, application is wide; Videotape speed 1～30 frame/s, can do detection quiet, dynamic object temperature variation.
Thermal infrared imager basic functional principle: at given temperature and wavelength, the radiation energy of object transmitting has a maximal value, and this material is called black matrix, by Planck law:
W(λ，T)＝C
1/λ
5[exp(C
2/λT
-1]
-1(W/cm
2*μm)
In formula: C
1it is the 1st radiation constant; C
2it is the 2nd radiation constant.
Wavelength is certain, measure infrared energy W and just can calculate temperature value T, by with the comparison of black matrix benchmark parameter, instrument processor can calculate the temperature value of each measuring point reality in detail, and with the temperature scale of different colours, demonstrates the variation of monitoring surface Temperature Distribution.
The performance index of thermal infrared imager are as follows:
Determine temperature-measuring range: temperature-measuring range is the most important performance index of thermal infrared imager.According to blackbody radiation law, the variation of the emittance being caused by temperature at the short-wave band of spectrum is by the variation surpassing by the caused emittance of emissivity error.Pavement temperature is to change with atmospheric temperature and the temperature shining upon substantially, generally can be lower than-40 ℃ in northern China pavement temperature minimum temperature, generally can be higher than 90 ℃ in southern pavement temperature maximum temperature, in order to guarantee the precision of temperature measurer, the scope of monitor temperature is fixed on to-40 ℃～100 ℃;
Determine target size: thermal infrared imager can be divided into monochromatic temperature measurer and Two-color Measure Thermometer (radiation color comparison temperature measurement instrument) according to principle.For monochromatic temperature measurer, when carrying out thermometric, measured target area should be full of temperature measurer visual field.Suggestion measured target size surpass visual field size 50% for well.For Two-color Measure Thermometer, its temperature be by two independently in wavelength band the ratio of emittance determine.Therefore when measured target is very little, be not full of visual field, on Measure Channel, have smog, dust, stop, when emittance is had to decay, measurement result is not produced to significant impact.For targets tiny and among motion or vibrations, Two-color Measure Thermometer is optimal selection.This is because light diameter is little, has flexibility, can crooked, stop and folding passage on transmission light emittance.Thus, select Two-color Measure Thermometer;
Determine distance coefficient (optical resolution): distance coefficient is definite by the ratio of D:S, and infrared thermal imagery instrument probe is to the distance D between target and measured target diameter ratio.If thermal infrared imager must be arranged on wide part because environmental baseline limits, and measures again little target, just should select the thermal infrared imager of high optical resolution.Optical resolution is higher, increases D:S ratio, and the cost of thermal infrared imager is also higher.If thermal infrared imager wide, and target would be little, just should select the thermal infrared imager of high distance coefficient.For the thermal infrared imager of fixed focal length, in optical system focus, place is hot spot minimum position, is bordering on and is distal to focal position hot spot and all can increase.There are two distance coefficients.In order to guarantee that the precision of measuring can make again manufacturing cost reduce, the setting height(from bottom) of thermal infrared imager (with the height distance on road surface) fixes on 3-5 rice;
Determine wavelength coverage: warm area can be selected 1.6 μ m, the wavelength coverage of 2.2 μ m and 3.9 μ m.
The demarcation of thermal infrared imager: thermal infrared imager must be through demarcating the temperature that could correctly demonstrate measured target.
The present invention monitors the system of steel structure bridge pavement temperature information, as shown in Figure 1 and Figure 2, comprise thermal infrared imager, optical lens group 1, photoelectric commutator 2, signal processing and amplifying circuit 3, microprocessor 4, RS4855 and control center 6, thermal infrared imager is fixed on street lamp lamp bolt 12 by support 11, and support 11 fixes by bolt 13 with street lamp lamp bolt 12.
Thermal infrared imager is arranged on the two ends of steel structure bridge uplink and downlink direction, and laser locator is used to indicate the center position of thermal infrared imager receiving target temperature, and thermal infrared imager is for gathering the infrared light that send on road surface; The infrared light collecting is transferred to optical lens group 1, and wherein optical lens group 1 is by disturbing factors such as filtering visible rays, and the infrared light that only allows road surface send enters in receiver lens and focused on, so that the concentrated focus light signal of forming energy; Through the infrared energy focus light signal focusing on, drop on photoelectric commutator 2, photoelectric commutator 2 is converted to corresponding electric signal by light signal; Signal is processed with amplifying circuit 3 electric signal of acceptance is carried out to accurate amplification, leaches undesired signal simultaneously, exports the standard electric signal of certain spoke value; (data acquisition and processing are carried out in the instruction of sending by control center 6 from mouth (Slave Port) with synchronous serial interface and master-slave communication to use Intel80C196KR microprocessor 4, the electric signal obtaining is compared by the corresponding temperature data that set in advance in data algorithm and microprocessor 4, again after target transmit power is proofreaied and correct, obtain corresponding target temperature value, and the target temperature value that these are collected is stored in this locality by asking, send these data to control center 6 simultaneously.Also comprise environment temperature sensor, for realizing temperature compensation, wherein microprocessor 4 by RS485 universal serial bus 5 with control center 6 to communicating by letter.The correction of disturbing factor, is mainly the error that the interference (temperature, pollution etc.) of considering measurement environment brings, and by microprocessor 4, proofreaies and correct, and eliminates and disturbs, to improve the degree of accuracy of measurement.
By monitoring steel structure bridge pavement temperature information system application of the present invention in Anqing bridge.
Technical parameter is as follows:
Measure temperature range :-40 ℃ to 100 ℃; Measuring accuracy: 0.05 ℃; Working temperature :-40 ℃ to 60 ℃; Working relative humidity: 0...100%RH measuring distance: the longest 9.14 meters; Setting angle: 30 ° to 85 ° (from horizontal line); Test zone diameter: during apart from 10.6 meters, diameter is 0.79 meter; Side direction scanning angle: ± 53 °; Power supply: 12VDC (10mA); Power consumption: 33mW; Communication interface: RS485; The Refresh Data time: temperature data of every transmission;
The bridge road surface middle and upper reaches temperature changing trend obtaining as shown in Figure 3, bridge road surface middle and lower reaches temperature changing trend as shown in Figure 4,
On August 15th, 2013,14:00-14:59 was in this hour, bridge road surface middle and upper reaches temperature changing trend, control center 6 controls Anqing bridge and at bridge floor, has carried out the measure of watering cooling, by Fig. 3, can see, when 14:13, the temperature value that bridge road surface middle and upper reaches collect is more than 58 ℃, from 14:14, temperature declines rapidly, when 14:15, temperature reaches 54 ℃ of minimums, illustrate during this period of time, span centre bridge floor is spilt water, afterwards due to heat, temperature progressively rises again, when 14:22, return to again more than 58 ℃, equally, bridge road surface middle and lower reaches pavement temperature starts rapid decline at 14:30, and reach 50 ℃ of minimums at 14:32, after this start again progressively to rise.Observe Fig. 3 and Fig. 4, upstream and downstream bridge deck temperature starts at 14:24, due to reasons such as sunshines, has occurred temperature nature downward trend.
Take Jiangyin Bridge as example, according to the data of record since the operation of Jiangyin Bridge monitoring steel structure bridge pavement temperature system, can analyze situation of change and the impact on case beam temperature and stress of bridge pavement temperature.
Fig. 5～7 are one day trend maps on April 25th, 2013, and in figure, horizontal ordinate is time shaft (unit/hour), and ordinate is temperature (unit/degree Celsius), and Fig. 4 is bridge pavement (steel case beam upper surface) temperature changing trend; Fig. 5 is bridge pavement (steel case beam is inner) temperature variation and change trend; Fig. 6 is air temperature variations trend.
Fig. 5 displays temperature is one day minimum point when 4:00 AM, and temperature rises subsequently, peaks decline gradually subsequently to afternoon 12 left and right.Obviously, during 4:00 AM, along with the dribbling of one day heat, it is minimum that temperature reaches, and at the some periods of the day from 11 a.m. to 1 p.m 12, due to sun direct projection, the heat that now road surface is accepted is maximum, therefore temperature reaches mxm..
Fig. 6 displays temperature touches the bottom at 5:00 AM, reach maximum temperature at afternoon 13 o'clock, appearance is than the thermal infrared imager hysteresis time of about one hour, be mainly due to road surface material sluggishness the heat transmission of the sun and atmosphere, material itself also has the function of certain thermmal storage simultaneously, and these are all the reasons that makes steel case beam internal temperature hysteresis thermal infrared imager.
The temperature that Fig. 7 shows morning 7 left and right minimum, in afternoon 14:30 left and right, arrive peak.Why like this, except the reason of road surface material, also have air in steel case beam further to hinder the transmission of heat and scattered and disappeared, so compare with thermal infrared imager, the temperature hysteresis in steel case beam is more obvious.
The most important significance of pavement temperature monitoring is to understand in time the actual temperature on road surface, for taking in time corresponding maintenance measure that foundation is provided.Thereby illustrated that it is the most effectively to select that monitoring steel structure bridge pavement temperature infosystem of the present invention adopts thermal infrared imager.
In monitoring structural health conditions, the variation of stress is an important monitoring index, and the variation of case beam temperature is bound to cause the variation of case stress beam, will reject temperature impact while considering case stress beam.Fig. 5, Fig. 6 and Fig. 7 are respectively the change trend curve of temperature, air themperature in pavement temperature, case beam, from curve relatively, comparison diagram 8, STRESS VARIATION more approaches the change curve of air themperature.Due to air temperature sensor not being set in many structural healthy monitoring systems, need to consider by the numerical value that in pavement temperature sensor or case beam, temperature sensor obtains the compensation of counter stress data, counter stress changes infers.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (7)
1. a method of monitoring steel structure bridge pavement temperature information, is characterized in that, is applied to the hardware platform based on thermal infrared imager, and the described hardware platform based on thermal infrared imager comprises optical lens group, photoelectric commutator and microprocessor, and the method comprises:
By thermal infrared imager, obtain the infrared light that send on road surface, and the infrared light described road surface being sent by described optical lens group carries out pre-service and obtains light signal;
According to described light signal, by described photoelectric commutator, obtain electric signal;
According to described electric signal, by microprocessor, obtain pavement temperature information, and described pavement temperature information is uploaded to control center, control center applies accordingly according to the pavement temperature information realization of uploading;
Described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
2. the method for monitoring steel structure bridge pavement temperature information according to claim 1, is characterized in that, the infrared light described road surface being sent by described optical lens group carries out pre-service, specifically comprises:
The infrared light that road pavement is sent carries out filtering interfering and focuses on processing, and obtains light signal.
3. the method for monitoring steel structure bridge pavement temperature information according to claim 1, is characterized in that, by described photoelectric commutator, obtains electric signal, specifically comprises:
The light signal obtaining drops on described photoelectric commutator, and photoelectric commutator is converted to electric signal by corresponding light signal.
4. the method for monitoring steel structure bridge pavement temperature information according to claim 1, is characterized in that, by microprocessor, obtains pavement temperature information, specifically comprises:
The electric signal obtaining is compared by the corresponding temperature data that set in advance in data algorithm and described microprocessor, then after target transmit power is proofreaied and correct, obtain corresponding target temperature value, and data are sent to control center;
The electric signal obtaining is changed to corresponding data by the pavement temperature in the setting-up time section setting in advance in data algorithm and described microprocessor to be compared, again after target transmit power is proofreaied and correct, obtain the pavement temperature value in corresponding setting-up time section, and data are sent to control center.
5. a device of monitoring steel structure bridge pavement temperature information, is characterized in that, comprises thermal infrared imager, optical lens group, photoelectric commutator and microprocessor; Wherein,
Described thermal infrared imager, the infrared light sending for gathering road surface;
Described optical lens group, the infrared light sending for road pavement carries out filtering interfering and focuses on processing, and obtains light signal;
Described photoelectric commutator, for being converted to electric signal by described light signal;
Described microprocessor, for described electric signal is converted to pavement temperature information, described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
6.Yi Zhong control center, is characterized in that, comprising:
Processing unit, for applying accordingly according to described pavement temperature information realization, described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
7. a system of monitoring steel structure bridge pavement temperature information, is characterized in that, comprising:
The device of monitoring steel structure bridge pavement temperature, for gathering the infrared light that send on road surface, the infrared light gathering carries out filtering interfering and focuses on to process obtaining light signal, described light signal obtains electric signal through photoelectric commutator, according to described electric signal, obtain pavement temperature information, and described pavement temperature information is uploaded to control center;
Control center, for according to described pavement temperature information realization respective application;
Described pavement temperature information comprises the pavement temperature change information in road surface real time temperature information and setting-up time section.
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