CN111458091A - Bridge span monitoring system and method based on illumination intensity - Google Patents
Bridge span monitoring system and method based on illumination intensity Download PDFInfo
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- CN111458091A CN111458091A CN202010449823.8A CN202010449823A CN111458091A CN 111458091 A CN111458091 A CN 111458091A CN 202010449823 A CN202010449823 A CN 202010449823A CN 111458091 A CN111458091 A CN 111458091A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
Abstract
The invention discloses a bridge span monitoring system and method based on illumination intensity, relating to the technical field of bridge monitoring, wherein the monitoring system comprises: the device comprises a light source, a reflector, an illumination image acquisition assembly and a control center; the light source is used for emitting light to the reflector; the reflector is used for reflecting the illumination to the illumination image acquisition assembly; the illumination image acquisition assembly is used for acquiring illumination reflected by the reflector to form an illumination image and transmitting the illumination image to the control center; the control center is used for respectively intercepting a longitudinal section illumination map of the illumination image under the condition that the bridge span is under no load and under the condition that the vehicle load is under the same vertical coordinate, obtaining two illumination intensity trend curves according to the two longitudinal section illumination maps, calculating a correlation coefficient between the two illumination intensity trend curves, and judging that the vehicle load exceeds the bridge span rated load if the correlation coefficient is greater than a preset correlation coefficient. The invention has lower manufacturing cost, maintenance cost and use cost and is easy to popularize.
Description
Technical Field
The invention relates to the technical field of bridge monitoring, in particular to a bridge span monitoring system and method based on illumination intensity.
Background
With the high-speed development of traffic construction in China, the number of bridges in a road traffic network is continuously increased. For the safe operation of a highway traffic network, the safety of a bridge structure is particularly important. In recent years, the transportation of vehicles in overload and overrun brings great harm to the safety of highway bridges, becomes a main hidden danger of the safety of the highway bridges, and causes a plurality of bridge toppling and side turning accidents due to illegal overload of large freight vehicles. The bridge monitoring technology not only can be used for completing and accepting a newly-built bridge, but also can be used for evaluating the operation bearing capacity of the built bridge, and becomes an important technical means for testing the health condition of the bridge.
In the related art, the main techniques for monitoring bridges at present include a bridge span deflection measuring method and a bridge deck dynamic weighing measuring method. The laser range finder is used for monitoring the bridge span deflection in real time by matching with a reflection target, and can be used for monitoring the static load of a newly-built bridge and the dynamic load during the operation of the bridge at ordinary times. The latter is developed in large scale in recent years, based on a dynamic weighing sensing system, a sensor is arranged on a road section at the end of an upper bridge to monitor information such as total weight, axle weight and the like of vehicles in real time, and the weight of vehicles passing through the bridge floor can be monitored in time by combining information such as vehicle models, license plates and the like recorded by a bridge floor camera system.
However, the first method can generally effectively monitor the down-warping data of some important bridges, but if the first method is used for a multi-span bridge, a large number of laser range finders are needed, so that the overall cost is high, and the first method is difficult to popularize. The sensor of the second method needs to be arranged on the driving road surface of the bridge, and the failure rate is extremely high in the freight transportation dense area, so that the maintenance and use cost is overhigh.
Disclosure of Invention
The embodiment of the invention provides a bridge span monitoring system and a bridge span monitoring method based on illumination intensity, and aims to solve the technical problems that a bridge monitoring system in the related technology is high in manufacturing cost or overhigh in maintenance and use cost.
In a first aspect, a bridge span monitoring system based on illumination intensity is provided, including: the device comprises a light source, a reflector, an illumination image acquisition assembly and a control center;
the light source is fixed on a bridge pier on one side of the bridge span and used for emitting light to the reflector;
the reflector is fixed at the middle bottom of the bridge span and used for reflecting the illumination to the illumination image acquisition assembly;
the illumination image acquisition assembly is fixed on a pier on the other side of the bridge span and is used for acquiring illumination reflected by the reflector to form an illumination image and transmitting the illumination image to the control center;
the control center is used for respectively intercepting a longitudinal section illumination map of the illumination image under the condition that the bridge span is under no load and under the condition that the vehicle load is under the same longitudinal coordinate, obtaining two illumination intensity trend curves according to the two longitudinal section illumination maps, calculating a correlation coefficient between the two illumination intensity trend curves, and judging that the vehicle load exceeds the bridge span rated load if the correlation coefficient is greater than a preset correlation coefficient.
In some embodiments, the control center comprises:
the image processing module is used for respectively intercepting a longitudinal section illumination map of the illumination image under the same longitudinal coordinate when the bridge span is under no load and under vehicle load, and obtaining two illumination intensity trend curves according to the two longitudinal section illumination maps;
a calculation module for calculating a correlation coefficient between the two illumination intensity trend curves;
and the judging module is used for comparing the correlation coefficient with a preset correlation coefficient, and if the correlation coefficient is smaller than the preset correlation coefficient, judging that the vehicle load exceeds the bridge span rated load.
In some embodiments, the predetermined correlation coefficient is not less than 0.95.
In some embodiments, the monitoring system further comprises:
the bridge deck image acquisition assembly is used for acquiring images of vehicles running into the bridge deck and transmitting the images to a control center, the control center obtains the length, width and height of the vehicles according to the images of the vehicles, and the light source and the illumination image acquisition assembly are configured to: when any size of the vehicle is larger than the corresponding preset size, the control center sends out an instruction to start the light source and the illumination image acquisition assembly.
The light source of the monitoring system is L ED light source.
In a second aspect, a method for monitoring a bridge span based on illumination intensity is provided, which includes the following steps:
fixing a light source on a bridge pier on one side of a bridge span, fixing a reflector on the bottom of the middle of the bridge span, and fixing an illumination image acquisition assembly on the bridge pier on the other side of the bridge span;
under the no-load condition and the vehicle load condition of the bridge span, respectively using the light source to emit light to the reflector, reflecting the light to the light image acquisition assembly by the reflector, and forming a light image by the light reflected by the reflector and transmitting the light image to the control center by the light image acquisition assembly;
the control center respectively intercepts a longitudinal section illumination map of the illumination image of the bridge span under no load and the illumination image of the vehicle load under the same longitudinal coordinate, two illumination intensity trend curves are obtained according to the two longitudinal section illumination maps, the correlation coefficient between the two illumination intensity trend curves is calculated, and if the correlation coefficient is larger than the preset correlation coefficient, the vehicle load is judged to exceed the bridge span load.
In some embodiments, an image processing module of the control center respectively intercepts a longitudinal section illumination map of the illumination image under the condition that the bridge span is under no load and under the condition that the bridge span is under a vehicle load under the same longitudinal coordinate, and two illumination intensity trend curves are obtained according to the two longitudinal section illumination maps;
a calculation module of the control center calculates a correlation coefficient between the two illumination intensity trend curves;
and a judging module of the control center compares the correlation coefficient with a preset correlation coefficient, and if the correlation coefficient is smaller than the preset correlation coefficient, the vehicle load is judged to exceed the bridge span rated load.
In some embodiments, the predetermined correlation coefficient is not less than 0.95.
In some embodiments, the bridge deck image acquisition assembly acquires an image of a vehicle running into the bridge deck and transmits the image to the control center, the control center obtains the length, width and height of the vehicle according to the image of the vehicle, and if any dimension of the vehicle is larger than a corresponding preset dimension, the control center sends an instruction to start the light source and the illumination image acquisition assembly.
In some embodiments, an L ED light source is used as the light source to emit light to the reflector.
The embodiment of the invention provides a bridge span monitoring system and a bridge span monitoring method based on illumination intensity, wherein the monitoring system comprises a light source, a reflector, an illumination image acquisition assembly and a control center, the light source provides a reflection light source for the reflector, images reflected by the reflector are collected by the illumination image acquisition assembly, the control center compares the reflected illumination images of the bridge span in a no-load state and a vehicle load state, and analyzes and compares the illumination intensity trend curves of longitudinal section illumination images of the two illumination images under the same longitudinal coordinate, so as to judge the real-time deformation of the bridge span and further evaluate the influence of the load of a bridge vehicle on the bridge span. The light source, the reflector and the illumination image acquisition assembly are mature devices with low price, the manufacturing cost is low, and a plurality of bridges can be arranged and installed in a span mode. And moreover, the main installation positions of the bridge span and the bridge pier are positioned at the bottom of the bridge span or on the bridge pier, the space position of the bridge span and the road surface is not occupied, the bridge span and the bridge pier are not easily damaged by traffic flow, and the bridge is easy to install, maintain and use and popularize for old bridges and newly-built bridges.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a bridge span monitoring system based on illumination intensity provided by an embodiment of the present invention;
FIG. 2 is a transverse cross-sectional view of the reflector of FIG. 1;
fig. 3 is a light intensity value trend curve corresponding to the light reflection plate image and a longitudinal section illumination map acquired by the bridge span under no-load condition by the illumination image acquisition assembly provided by the embodiment of the invention;
fig. 4 is a light intensity value trend curve corresponding to the light reflection plate image acquired by the light image acquisition assembly when the bridge spans on a vehicle load on one side and a longitudinal section light map provided by the embodiment of the invention;
fig. 5 is a light intensity value trend curve corresponding to a light reflection plate image and a longitudinal section illumination map acquired by the illumination image acquisition assembly when the bridge spans the bridge and under the vehicle load;
FIG. 6 is a flowchart of a bridge span monitoring method based on illumination intensity according to an embodiment of the present invention;
in the figure: 1. a light source; 2. a reflector; 3. an illumination image acquisition component; 4. a control center; 5. bridge floor image acquisition subassembly.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a bridge span monitoring system based on illumination intensity, which can solve the technical problems of higher manufacturing cost or overhigh maintenance and use cost of the monitoring system in the related technology.
Referring to fig. 1 and 2, a bridge span monitoring system based on illumination intensity includes: light source 1, reflector panel 2, illumination image acquisition component 3 and control center 4.
The light source 1 is fixed on a bridge pier on one side of the bridge span, the light source 1 is used for emitting light to the reflector 2, preferably, the light source 1 is an L ED light source, the reflector 2 is fixed on the middle bottom of the bridge span, the reflector 2 is used for reflecting the light to the light image acquisition assembly 3, the light image acquisition assembly 3 is fixed on the bridge pier on the other side of the bridge span, and the light image acquisition assembly 3 is used for acquiring the light reflected by the reflector 2 to form a light image and transmitting the light image to the control center 4.
The control center 4 is configured to respectively intercept a longitudinal section illumination map of the illumination image of the bridge span under no load and under the vehicle load under the same vertical coordinate, obtain two illumination intensity trend curves according to the two longitudinal section illumination maps, calculate a correlation coefficient between the two illumination intensity trend curves, and determine that the vehicle load exceeds a bridge span rated load if the correlation coefficient is greater than a preset correlation coefficient.
Referring to fig. 1 and 2, when the bridge span is empty, the light source 1 emits light to the reflector 2, the reflector 2 reflects the light to the light image collecting assembly 3, the light image collecting assembly 3 collects the light reflected by the reflector 2 to form a light image and transmits the light image to the control center 4, the control center 4 intercepts a longitudinal section light map of the light image of the bridge span under the empty load under a certain longitudinal coordinate, and obtains a light intensity trend curve according to the longitudinal section light map. Referring to fig. 3, (a) in fig. 3 shows the form of the reflector when the bridge span is empty, (b) shows that the illumination image acquisition assembly 3 acquires the illumination reflected by the reflector 2 to form an illumination image when the bridge span is empty, and (c) shows that the control center 4 intercepts a longitudinal section illumination map of the illumination image when the bridge span is empty under a certain ordinate, and obtains an illumination intensity trend curve according to the longitudinal section illumination map. In the embodiment of the invention, (c) a longitudinal section illumination map is intercepted by a longitudinal coordinate where the black short line in (b) is located to obtain an illumination intensity trend curve, wherein the horizontal coordinate in (c) is the coordinate in the length direction of the reflector 2, and the longitudinal coordinate is an illumination intensity numerical value. Similarly, referring to fig. 4 and 5, the light intensity trend curves of the bridge span under two vehicle loads can be obtained respectively. Calculating a correlation coefficient between the illumination intensity trend curve in fig. 4 or 5 and the illumination intensity trend curve in fig. 3, and if the correlation coefficient is greater than a preset correlation coefficient, determining that the vehicle load corresponding to fig. 4 or 5 exceeds the bridge span rated load.
Compared with the prior art, the bridge span monitoring system based on the illumination intensity comprises a light source 1, a reflector 2, an illumination image acquisition assembly 3 and a control center 4, wherein the light source 1 provides a reflection light source for the reflector 2, images reflected by the reflector 2 are collected by the illumination image acquisition assembly 3, the control center 4 compares the reflected illumination images of the bridge span in an unloaded state and a vehicle load state, analyzes and compares the illumination intensity trend curves of longitudinal section illumination images of the two illumination images in the same longitudinal coordinate, judges the real-time deformation of the bridge span and further evaluates the influence of the vehicle load of the bridge span. The light source 1, the reflector 2 and the illumination image acquisition assembly 3 in the embodiment of the invention are mature devices with low price, have low manufacturing cost and can be installed in a plurality of bridge spans. And moreover, the main installation positions of the bridge span and the bridge pier are positioned at the bottom of the bridge span or on the bridge pier, the space position of the bridge span and the road surface is not occupied, the bridge span and the bridge pier are not easily damaged by traffic flow, and the bridge is easy to install, maintain and use and popularize for old bridges and newly-built bridges.
As an optional implementation manner, the control center 4 in the embodiment of the present invention includes: the device comprises an image processing module, a calculating module and a judging module. The image processing module is used for respectively intercepting a longitudinal section illumination map of the illumination image of the bridge span under no load and under vehicle load under the same longitudinal coordinate, and obtaining two illumination intensity trend curves according to the two longitudinal section illumination maps. The calculation module is used for calculating a correlation coefficient between the two illumination intensity trend curves. The judging module is used for comparing the correlation coefficient with a preset correlation coefficient, and if the correlation coefficient is smaller than the preset correlation coefficient, judging that the vehicle load exceeds the bridge span rated load. Preferably, the preset correlation coefficient is not less than 0.95.
As an optional implementation manner, referring to fig. 2, the monitoring system for bridge-crossing vehicle load in the embodiment of the present invention further includes a bridge deck image collecting assembly 5, where the bridge deck image collecting assembly 5 is configured to collect an image of a vehicle driving into the bridge deck and transmit the image to the control center 4, the control center 4 obtains the length, width, and height dimensions of the vehicle according to the image of the vehicle, and the light source 1 and the illumination image collecting assembly 3 are configured to: when any size of the vehicle is larger than the corresponding preset size, the control center 4 sends an instruction to start the light source 1 and the illumination image acquisition assembly 3. Bridge floor image acquisition subassembly 5 can be according to the vehicle condition of bridge floor, and control light source 1 and illumination image acquisition subassembly 3 start, avoid light source 1 and illumination image acquisition subassembly 3 long-term work, practice thrift use cost, extension light source 1 and illumination image acquisition subassembly 3 life.
Referring to fig. 6, an embodiment of the present invention further provides a bridge span monitoring method based on illumination intensity, including the following steps:
the light source 1 is fixed on a bridge pier on one side of the bridge span, the reflector 2 is fixed on the bottom of the middle of the bridge span, and the illumination image acquisition assembly 3 is fixed on the bridge pier on the other side of the bridge span.
Under no load and vehicle load, the bridge span respectively uses the light source 1 to emit light to the reflector 2, the reflector 2 reflects the light to the light image acquisition component 3, the light image acquisition component 3 forms a light image by acquiring the light reflected by the reflector 2 and transmits the light image to the control center 4, and preferably, an L ED light source is adopted to emit light to the reflector 2.
The control center 4 respectively intercepts a longitudinal section illumination map of the illumination image of the bridge span under no load and the illumination image of the vehicle load under the same longitudinal coordinate, obtains two illumination intensity trend curves according to the two longitudinal section illumination maps, calculates a correlation coefficient between the two illumination intensity trend curves, and judges that the vehicle load exceeds the bridge span load if the correlation coefficient is greater than a preset correlation coefficient.
As an optional implementation manner, in the embodiment of the present invention, the image processing module of the control center 4 respectively intercepts a longitudinal section illumination map of the illumination image of the bridge span under no load and under vehicle load under the same longitudinal coordinate, and obtains two illumination intensity trend curves according to the two longitudinal section illumination maps. The calculation module of the control center 4 calculates a correlation coefficient between the two illumination intensity trend curves. And the judgment module of the control center 4 compares the correlation coefficient with a preset correlation coefficient, and judges that the vehicle load exceeds the bridge span rated load if the correlation coefficient is smaller than the preset correlation coefficient. Preferably, the preset correlation coefficient is not less than 0.95.
As an optional implementation manner, referring to fig. 2, in the bridge span monitoring method based on illumination intensity in the embodiment of the present invention, the bridge deck image capturing component 5 captures an image of a vehicle driving into the bridge deck of the bridge span and transmits the image to the control center 4, the control center 4 obtains the length, width, and height dimensions of the vehicle according to the image of the vehicle, and if any dimension of the vehicle is greater than a corresponding preset dimension, the control center 4 sends an instruction to start the light source 1 and the illumination image capturing component 3. Bridge floor image acquisition subassembly 5 can be according to the vehicle condition of bridge floor, and control light source 1 and illumination image acquisition subassembly 3 start, avoid light source 1 and illumination image acquisition subassembly 3 long-term work, practice thrift use cost, extension light source 1 and illumination image acquisition subassembly 3 life.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A bridge span monitoring system based on illumination intensity, comprising: the device comprises a light source (1), a reflector (2), an illumination image acquisition assembly (3) and a control center (4);
the light source (1) is fixed on a bridge pier on one side of the bridge span, and the light source (1) is used for emitting light to the reflector (2);
the reflector (2) is fixed at the middle bottom of the bridge span, and the reflector (2) is used for reflecting the illumination to the illumination image acquisition assembly (3);
the illumination image acquisition assembly (3) is fixed on a pier on the other side of the bridge span, and the illumination image acquisition assembly (3) is used for acquiring illumination reflected by the reflector (2) to form an illumination image and transmitting the illumination image to the control center (4);
the control center (4) is used for respectively intercepting a longitudinal section illumination map of the illumination image under the condition that the bridge span is under no load and under the condition that the vehicle load is under the same longitudinal coordinate, obtaining two illumination intensity trend curves according to the two longitudinal section illumination maps, calculating a correlation coefficient between the two illumination intensity trend curves, and judging that the vehicle load exceeds the rated load of the bridge span if the correlation coefficient is greater than a preset correlation coefficient.
2. The system for monitoring a bridge span based on illumination intensity according to claim 1, wherein the control center (4) comprises:
the image processing module is used for respectively intercepting a longitudinal section illumination map of the illumination image under the same longitudinal coordinate when the bridge span is under no load and under vehicle load, and obtaining two illumination intensity trend curves according to the two longitudinal section illumination maps;
a calculation module for calculating a correlation coefficient between the two illumination intensity trend curves;
and the judging module is used for comparing the correlation coefficient with a preset correlation coefficient, and if the correlation coefficient is smaller than the preset correlation coefficient, judging that the vehicle load exceeds the bridge span rated load.
3. The illumination intensity based bridge span monitoring system according to claim 2, wherein:
the preset correlation coefficient is not less than 0.95.
4. The illumination intensity-based bridge span monitoring system according to claim 1, further comprising:
a bridge deck image acquisition assembly (5) for acquiring an image of a vehicle driving into the bridge deck and transmitting the image to a control center (4), the control center (4) obtaining the length, width and height dimensions of the vehicle according to the image of the vehicle, the light source (1) and the illumination image acquisition assembly (3) being configured to: when any size of the vehicle is larger than the corresponding preset size, the control center (4) sends an instruction to enable the light source (1) and the illumination image acquisition assembly (3) to be started.
5. The bridge span monitoring system based on illumination intensity as claimed in claim 1, wherein the light source (1) is L ED light source.
6. A bridge span monitoring method based on illumination intensity is characterized by comprising the following steps:
the method comprises the following steps that a light source (1) is fixed on a bridge pier on one side of a bridge span, a light reflecting plate (2) is fixed at the bottom of the middle of the bridge span, and a lighting image acquisition assembly (3) is fixed on the bridge pier on the other side of the bridge span;
under the no-load and vehicle load of the bridge span, the light source (1) is used for emitting illumination to the reflector (2), the reflector (2) reflects the illumination to the illumination image acquisition assembly (3), and the illumination image acquisition assembly (3) collects the illumination reflected by the reflector (2) to form an illumination image and transmits the illumination image to the control center (4);
the control center (4) respectively intercepts a longitudinal section illumination map of the illumination image of the bridge span under no load and under the vehicle load under the same longitudinal coordinate, two illumination intensity trend curves are obtained according to the two longitudinal section illumination maps, the correlation coefficient between the two illumination intensity trend curves is calculated, and if the correlation coefficient is larger than the preset correlation coefficient, the vehicle load is judged to exceed the bridge span load.
7. The monitoring method of claim 6, wherein:
an image processing module of the control center (4) respectively intercepts a longitudinal section illumination map of the illumination image of the bridge span under no load and under vehicle load under the same longitudinal coordinate, and two illumination intensity trend curves are obtained according to the two longitudinal section illumination maps;
a calculation module of the control center (4) calculates a correlation coefficient between the two illumination intensity trend curves;
and a judging module of the control center (4) compares the correlation coefficient with a preset correlation coefficient, and if the correlation coefficient is smaller than the preset correlation coefficient, the vehicle load is judged to exceed the bridge span rated load.
8. The monitoring method of claim 7, wherein:
the preset correlation coefficient is not less than 0.95.
9. The monitoring method of claim 6, wherein:
the bridge deck image acquisition assembly (5) acquires images of vehicles running into the bridge deck and transmits the images to the control center (4), the control center (4) obtains the length, width and height of the vehicles according to the images of the vehicles, and if any size of the vehicles is larger than the corresponding preset size, the control center (4) sends an instruction to enable the light source (1) and the illumination image acquisition assembly (3) to be started.
10. A method as claimed in claim 6, characterized in that an L ED light source is used as the light source (1) for emitting light to the reflector (2).
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Application publication date: 20200728 |