CN106940370A - Asphalt Pavement Compaction Degree Index detection method, apparatus and system - Google Patents
Asphalt Pavement Compaction Degree Index detection method, apparatus and system Download PDFInfo
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- CN106940370A CN106940370A CN201710078870.4A CN201710078870A CN106940370A CN 106940370 A CN106940370 A CN 106940370A CN 201710078870 A CN201710078870 A CN 201710078870A CN 106940370 A CN106940370 A CN 106940370A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The embodiment of the invention discloses a kind of Asphalt Pavement Compaction Degree Index detection method, apparatus and system.Method includes：The echo-signal of radar transmissions is obtained, the echo-signal is the back wave received when the radar is detected to the measurement point of bituminous paving；The echo-signal is analyzed, the corresponding dielectric constant of each measurement point is obtained；The corresponding compactness index of each measurement point is obtained according to the dielectric constant；The corresponding compactness of each measurement point is obtained according to the compactness index, and using the corresponding compactness of each measurement point as bituminous paving compacting degrees of data.The embodiment of the present invention is by introducing compactness index, simplifiedly to describe the quantitative relationship between dielectric constant and compactness, compared with prior art, staff can directly obtain compacting degrees of data, the shortcoming that conventional radar image identification relies primarily on experience accumulation is broken through, transformation of the pavement structure internal flaw from micro-judgment to quantitative identification is realized.
Description
Technical field
The present embodiments relate to the radar exploration technique field, and in particular to a kind of Asphalt Pavement Compaction Degree Index detection method,
Apparatus and system.
Background technology
Compactness is the live actual density and Asphalt Mixture Experiment room mark of bituminous paving after asphalt compacting
The ratio of quasi- density, is generally expressed as a percentage.Good compacting can reduce the volume of air in asphalt unit volume,
Increase the ratio of solid grain, improving long-term holding road surface under barrier performance, Vehicle Load has higher resistance, from
And extend the service life on road surface.The size of compactness directly affects the heat resistance of bituminous paving, crack resistance, skid resistance, durable
Property and permeability.At present, Department of Transportation's professional standard《Highway subgrade road surface on-the-spot test code》In (JTG E60-2008),
The asphalt surface course detection methods of compaction degree of recommendation has core boring sampling method, nuclear gauge method and Non-nuclear Density Gauge method.
But core boring sampling method, nuclear gauge method and Non-nuclear Density Gauge method have the disadvantage that：
(1) core boring sampling method is to take out asphalt core sample by being drilled in pavement structure, in measurement in lab core
Sample density, by calculating the ratio between core sample density and standard density, obtains the compactness at bituminous paving drill core.The detection method is surveyed
Try speed slow, measuring point is limited, it is representative poor, there is damageability to original pavement structure.
(2) the atomic weight summation for all elements that Nucleus Density Apparatus method is contained by detecting in material, calculates material wet close
Degree and moisture content, so as to obtain the dry density of material, compactness is calculated further according to known standard density.Nuclear gauge is used
When asphaltic road-mix surface course is detected, because asphaltic road-mix surface course surface is relatively rough, convex-concave degree differs, and causes detection to tie
Fruit is bigger than actual value, makes Detection results poor.This method must can be used with core boring sampling method demarcation rear.Although the close humidity of nucleon
Instrument method is faster than core boring sampling method speed, but is not still continuous detection, it is impossible to from the compacting situation for truly reflecting road surface, and
And transmitting radioactive ray may produce a certain degree of harm to human body.
(3) dielectric constant and can be converted into by Non-nuclear Density Gauge by electron capacitance induction field come Measuring Dielectric Constant
The density value of material is shown on screen.In use, being also required to the measurement result contrast with core boring sampling, instrument mark is carried out
It is fixed.Compared with Nucleus Density Apparatus, faster, but measurement section is still discontinuous for Non-nuclear Density Gauge measuring speed, therefore can not be compared with
Intactly reflect the actual compacting situation on road surface.
During the embodiment of the present invention is realized, inventor has found the detection method recommended except professional standard, in recent years
Carry out GPR (also known as geological radar) to be also widely used in pavement engineering detection, part radar is had outside Current Domestic
The theoretical research of compactness of pavement is detected, but applicable cases are not good, do not have ripe theoretical and successful application case.Study carefully it
Reason is that GPR is unable to Direct Recognition compactness performance indications, and the research for being normally based on dielectric constant is realized, i.e.,
Study the quantitative relationship between dielectric constant and compactness.But in actual applications, between this dielectric constant and compactness
Quantitative relationship need the very professional staff could to provide compacting degrees of data substantially based on experience, exist to work people
Member requirement it is higher, compacting degrees of data it is inaccurate the problem of.
The content of the invention
One purpose of the embodiment of the present invention be research and develop rapidly and efficiently, continuous, unabroken Asphalt Pavement Compaction Degree Index detection
Method, solve conventional compaction degree detection method test the speed slowly, the defect such as discontinuous, the representativeness difference of measuring point, be asphalt pavement construction matter
Measure process control and technology guarantee is provided.
The embodiment of the present invention proposes a kind of Asphalt Pavement Compaction Degree Index detection method, including：
The echo-signal of radar transmissions is obtained, the echo-signal is examined for the radar to the measurement point of bituminous paving
The back wave received during survey；
The echo-signal is analyzed, the corresponding dielectric constant of each measurement point is obtained；
The corresponding compactness index of each measurement point is obtained according to the dielectric constant；
The corresponding compactness of each measurement point is obtained according to the compactness index, and by the corresponding compacting of each measurement point
Spend the compacting degrees of data as bituminous paving.
Optionally, before the echo-signal of radar transmissions is obtained, methods described also includes：
Obtain the gps data of the radar collection；
It is whole by detection of the actual terminal of the bituminous paving using the actual start of the bituminous paving as detection starting point
Stop, with reference to the gps data, sets up detection path corresponding with the bituminous paving；
Correspondingly, the corresponding compactness of each measurement point is included as the compactness data of bituminous paving：
According to the detection path and the corresponding relation of the bituminous paving, each measurement point on the detection path is reflected
It is mapped on the bituminous paving；
Using the compactness of each measurement point as the point with each measurement point on the bituminous paving with mapping relations compacting
Degree, obtains the compacting degrees of data of the bituminous paving.
Optionally, using the corresponding compactness of each measurement point as before the compacting degrees of data of bituminous paving, it is described
Method also includes：
Compactness corresponding to each measurement point detects that corresponding compactness has exception if each measurement point is known in detection
When, then check there is abnormal measurement point.
Optionally, after the corresponding compactness index of each measurement point is obtained according to the dielectric constant and to each measurement
Before the corresponding compactness of point is detected, methods described also includes：
The compactness index of each measurement point is contrasted with default standard compaction degree index；
If contrast knows there is the measurement point that compactness index is less than the standard compaction degree index in each measurement point, right
The measurement point that compactness index is less than the standard compaction degree index is checked.
Optionally, after the echo-signal of radar transmissions is obtained, methods described also includes：
The echo information is sent to display, so that the display shows the echo-signal；
Wherein, the speed of service of the display speed of the echo-signal and radar antenna keeps synchronous.
The embodiment of the present invention proposes a kind of Asphalt Pavement Compaction Degree Index detection means, including：
Acquisition module, the echo-signal for obtaining radar transmissions, the echo-signal is the radar to bituminous paving
The back wave that receives when being detected of measurement point；
Analysis module, for analyzing the echo-signal, obtains the corresponding dielectric constant of each measurement point；
First processing module, for obtaining the corresponding compactness index of each measurement point according to the dielectric constant；
Second processing module, for obtaining the corresponding compactness of each measurement point according to the compactness index, and will be described
The corresponding compactness of each measurement point as bituminous paving compacting degrees of data.
The embodiment of the present invention proposes a kind of Asphalt Pavement Compaction Degree Index detecting system, including：Asphalt road face pressure described above
Solidity detection means, conveying arrangement and radar installations；
The conveying arrangement, for loading the Asphalt Pavement Compaction Degree Index detection means and the radar installations, and with pre-
If speed is travelled along bituminous paving；
The radar installations, for launching electromagnetic wave to the bituminous paving, receives the echo-signal returned, and will be described
Echo-signal is transmitted to the Asphalt Pavement Compaction Degree Index detection means.
Optionally, the centre frequency of the transmitting antenna of the radar installations and reception antenna is 2Ghz, and band is wider than
100%；The distance of transmitting antenna and the real-time reception antenna is 30cm.
Optionally, longitudinal sampling interval of the radar installations is not more than 20cm, and the pre-set velocity of the conveying arrangement is not
Less than 40km/h.Optionally, the system also includes：GPS device；
The GPS device, the real-time latitude and longitude coordinates information for gathering conveying arrangement, and the longitude and latitude collected is sat
Mark information is sent to the radar installations, so that radar installations asphalt road according to the latitude and longitude coordinates Information locating
The measurement point in face.
As shown from the above technical solution, a kind of Asphalt Pavement Compaction Degree Index detection method of embodiment of the present invention proposition, device
And system is by introducing compactness index, simplifiedly to describe the quantitative relationship between dielectric constant and compactness, with existing skill
Art is compared, and staff can directly obtain compacting degrees of data, without higher professional knowledge, with staff is required it is low,
The high advantage of testing result accuracy.
Brief description of the drawings
The features and advantages of the present invention can be more clearly understood from by reference to accompanying drawing, accompanying drawing is schematical without that should manage
Solve to carry out any limitation to the present invention, in the accompanying drawings：
Fig. 1 shows the schematic flow sheet for the Asphalt Pavement Compaction Degree Index detection method that one embodiment of the invention is provided；
Fig. 2 shows the structural representation for the Asphalt Pavement Compaction Degree Index detection means that one embodiment of the invention is provided；
Fig. 3 shows the structural representation for the Asphalt Pavement Compaction Degree Index detecting system that one embodiment of the invention is provided；
Fig. 4 a show the section of echo-signal in the Asphalt Pavement Compaction Degree Index detection method that one embodiment of the invention is provided
Figure；
Fig. 4 b show that the Asphalt Pavement Compaction Degree Index detection method medium dielectric constant microwave medium that one embodiment of the invention is provided is calculated and shown
Illustration；
Fig. 4 c show the signal of echo-signal in the Asphalt Pavement Compaction Degree Index detection method that one embodiment of the invention is provided
Figure；
Fig. 5 shows the quantitative relationship model between the actual compactness and compactness index of one embodiment of the invention offer
Schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 shows the schematic flow sheet for the Asphalt Pavement Compaction Degree Index detection method that one embodiment of the invention is provided, referring to
Fig. 1, this method can be realized by processor, specifically include following steps：
110th, the echo-signal of radar transmissions is obtained, the echo-signal is that measurement of the radar to bituminous paving is clicked through
The back wave received during row detection；
It should be noted that when the bituminous paving to certain road is detected, radar is with default frequency to asphalt road
Surface launching electromagnetic wave, electromagnetic wave is after the filtering of bituminous paving, return echo signal, is received by radar and transmits echo letter
Number.
120th, the echo-signal is analyzed, obtains the corresponding dielectric constant of each measurement point；
130th, the corresponding compactness index of each measurement point is obtained according to the dielectric constant；
It should be noted that after the detection of whole bituminous paving is completed, processor can be according to all measurement points correspondence
Dielectric constant calculate obtain bituminous paving average dielectric constant, then, with reference to the dielectric constant and pitch of a certain measurement point
The average dielectric constant and formula on road surface calculate the compactness index for obtaining the measurement point.
140th, the corresponding compactness of each measurement point is obtained according to the compactness index, and each measurement point is corresponding
Compactness as bituminous paving compacting degrees of data.
It should be noted that first, processor needs to obtain the gps data of the radar collection；
Then, using the actual start of the bituminous paving as detection starting point, using the actual terminal of the bituminous paving as
Terminating point is detected, with reference to the gps data, detection path corresponding with the bituminous paving is set up；Wherein, actual start and reality
Terminal is the physical endpoint of physical presence in certain highway reality.
According to the detection path and the corresponding relation of the bituminous paving, each measurement point on the detection path is reflected
It is mapped on the bituminous paving；
Using the compactness of each measurement point as the point with each measurement point on the bituminous paving with mapping relations compacting
Degree, obtains the compacting degrees of data of the bituminous paving.
It can be seen that, the embodiment of the present invention is by introducing compactness index, simplifiedly to describe between dielectric constant and compactness
Quantitative relationship, compared with conventional compaction degree detection method, the detection method rapidly and efficiently, continuously, without breakage；Visit ground with existing
Radar detection technique is compared, and realizes transformation of the pavement structure internal injury defect from micro-judgment to quantitative identification.Work people
Member can directly obtain compacting degrees of data, without higher professional knowledge, with requiring staff low, testing result accuracy
High advantage.
In a possible embodiments, Fig. 1 correspondence embodiment on the basis of, the present embodiment in order to further ensure detection
As a result integrality after step 140, also includes：
Compactness corresponding to each measurement point detects that corresponding compactness has exception if each measurement point is known in detection
When, then check there is abnormal measurement point.
After step 130 and before being detected to the corresponding compactness of each measurement point, methods described also includes：
The compactness index of each measurement point is contrasted with default standard compaction degree index；
If contrast knows there is the measurement point that compactness index is less than the standard compaction degree index in each measurement point, right
The measurement point that compactness index is less than the standard compaction degree index is checked.
For method embodiment, in order to be briefly described, therefore it is all expressed as to a series of combination of actions, but ability
Field technique personnel should know that embodiment of the present invention is not limited by described sequence of movement, because according to the present invention
Embodiment, some steps can be carried out sequentially or simultaneously using other.Secondly, those skilled in the art should also know,
Embodiment described in this description belongs to preferred embodiment, involved action embodiment party not necessarily of the present invention
Necessary to formula.
Fig. 2 shows the structural representation for the Asphalt Pavement Compaction Degree Index detection means that one embodiment of the invention is provided, referring to
Fig. 2, the device includes：Acquisition module 210, analysis module 220, first processing module 230 and Second processing module 240, its
In：
Acquisition module 210, the echo-signal for obtaining radar transmissions, the echo-signal is the radar to asphalt road
The back wave received when the measurement point in face is detected；
Analysis module 220, for analyzing the echo-signal, obtains the corresponding dielectric constant of each measurement point；
First processing module 230, for obtaining the corresponding compactness index of each measurement point according to the dielectric constant；
Second processing module 240, for obtaining the corresponding compactness of each measurement point according to the compactness index, and by institute
State compacting degrees of data of the corresponding compactness of each measurement point as bituminous paving.
It should be noted that acquisition module 210 is after the echo-signal of radar transmissions is received, echo-signal will be sent
To analysis module 220, echo-signal is analyzed by analysis module 220, referring to Fig. 4 c, based on the amplitude shown in waveform with
And surface layer, basic unit, the time delay of the corresponding echo-signal of roadbed, the corresponding dielectric constant of measurement point is obtained, and will calculate what is obtained
Dielectric constant is sent to first processing module 230, by first processing module 230 according to dielectric constant, with reference to pre-established formula
Calculate and obtain compactness index, and the compactness index for calculating acquisition is sent to Second processing module 240, by second processing mould
Block 240 obtains the corresponding compactness of each measurement point according to the compactness index, and by the corresponding compactness of each measurement point
It is used as the compacting degrees of data of bituminous paving.
It can be seen that, the embodiment of the present invention is by introducing compactness index, simplifiedly to describe between dielectric constant and compactness
Quantitative relationship, compared with prior art, staff can directly obtain compacting degrees of data, without higher professional knowledge, tool
Have the advantages that to require staff low, testing result accuracy is high.
For device embodiments, because it is substantially similar to method embodiment, so description is fairly simple,
Related part illustrates referring to the part of method embodiment.
It should be noted that in all parts of the device of the present invention, according to the function that it to be realized to therein
Part has carried out logical partitioning, still, and the present invention is not only restricted to this, all parts can be repartitioned as needed or
Person combines.
Fig. 3 shows the structural representation for the Asphalt Pavement Compaction Degree Index detecting system that one embodiment of the invention is provided, referring to
Fig. 3, the system includes：Asphalt Pavement Compaction Degree Index detection means 210, the and of conveying arrangement 230 such as the corresponding embodiment propositions of Fig. 2
Radar installations 220；
The conveying arrangement 230, for loading the Asphalt Pavement Compaction Degree Index detection means 210 and the radar installations
220, and travelled with pre-set velocity along bituminous paving；
The radar installations 220, for launching electromagnetic wave to the bituminous paving, receives the echo-signal returned, and will
The echo-signal is transmitted to the Asphalt Pavement Compaction Degree Index detection means 210.
Wherein, the centre frequency of the transmitting antenna of radar installations 220 and reception antenna is 2Ghz, and band is wider than 100%；Institute
The distance for stating transmitting antenna and real-time reception antenna is 30cm.
Longitudinal sampling interval of radar installations 220 is not more than 20cm, and the pre-set velocity of the conveying arrangement is not less than 40km/
h。
It should be noted that in the Detection task on system perform detection road, starting point of the conveying arrangement 230 from the road
Travelled at a predetermined rate along the bituminous paving on the road to the terminal on the road, synchronously, radar installations 220 is launched to bituminous paving
Electromagnetic wave, receives the echo-signal returned, and the echo-signal received is sent to Asphalt Pavement Compaction Degree Index detection means
210, the compacting degrees of data for obtaining bituminous paving is handled by Asphalt Pavement Compaction Degree Index detection means 210.
It can be seen that, the embodiment of the present invention is by introducing compactness index, simplifiedly to describe between dielectric constant and compactness
Quantitative relationship, compared with prior art, staff can directly obtain compacting degrees of data, without higher professional knowledge, tool
Have the advantages that to require staff low, testing result accuracy is high.
In another possible embodiments, the system also includes：GPS device；
The GPS device, the real-time latitude and longitude coordinates information for gathering conveying arrangement, and the longitude and latitude collected is sat
Mark information is sent to the radar installations, so that radar installations asphalt road according to the latitude and longitude coordinates Information locating
The measurement point in face.
In addition, GPS device can be also integrated into radar or processor.
The operation principle of the system provided below Fig. 3 correspondence embodiments is described in detail：
Asphalt Pavement Compaction Degree Index detection identification technology based on Radar Technology, the main technical requirements including radar system,
Method is constituted with step, three parts of data analysis.
1st, radar system technical requirements and parameter
(1) antenna：Tubaeform horn antenna, centre frequency is 2GHz, and bandwidth is more than 100%.Transmitting antenna and connect
The distance for receiving antenna is 30cm.
(2) range resolution：Resolution ratio≤5cm.
(3) longitudinal sampling interval：≤20cm；Distance triggering measurement continuously measures optional；
(4) effective speed of detection：≥40km/h；
(5)GPS：For gathering the real-time latitude and longitude coordinates information of vehicular platform, the accurate fixed of radar return data is realized
Position, and show the driving trace of vehicle；
(6) fore-and-aft distance/velocity sensor (DMI)：Apart from accuracy of detection ＜ 0.5%.
2nd, method and step
2.1 equipment operating temperatures：0-40℃
2.2 install and parameter setting：The installation method that radar antenna is provided according to manufacturer is firmly installed.And by antenna
Connected with the line of main frame.Check connecting line install it is errorless after start preheating, preheating time must not less than vendors dictate when
Between.Metallic plate is placed on immediately below antenna, starts the calibrating procedure of control software, relevant parameter is obtained.Open control software
Parameter setting interface, according to different testing goals, the parameters such as sampling interval, time window, gain are set.
2.3 on-the-spot test：Carrying vehicle is parked in starting point, safety warning light is opened, starts software test program, makes driver
Slow accelerating vehicle is to normal detection speed.In detection process, operating personnel should record bridge, the culvert that test route is run into
The terminus of the works such as hole, tunnel.After antenna reaches end of line, operating personnel stop capture program, check data text
Part, file should be complete, and content should be normal, otherwise should retest.After system-wide section is completed, shutdown test system power supply, knot
Beam is tested.
3rd, data analysis
The radar graphic of detection is recorded with the wave form of pulse-echo, and radar vertical section is shown with waveform or gray scale
Figure, referring to Fig. 4 a.Due to the wave filter that underground medium is complicated equivalent to one, different degrees of absorption and Jie of the medium to ripple
The uneven property of matter so that when pulse reaches reception antenna, wave amplitude reduces, and waveform becomes have larger with original transmitted waveform
Difference.Dielectric constant according to obtained by being detected radar system, referring to Fig. 4 b, the actual pressure of bituminous paving is calculated by compactness index
Solidity.
Compactness index I is calculated by formula (1)c。
For pitch exemplar：
εr--- monolithic pitch exemplar dielectric constant is represented,
--- represent that identical materials match somebody with somebody the dielectric constant of lower standard compactness exemplar with level；
For actual bituminous paving：
εr--- represent bituminous paving measurement point dielectric constant
--- represent entire road average dielectric constant.
Obviously, with asphalt compaction degree there is dependency relation in compactness index, the bituminous paving matched somebody with somebody for identical materials and level
For, compactness is lower, and compactness index is lower.
Asphalt Pavement Compaction Degree Index is calculated by formula (2).
Wherein, constant, which is, to be tested or be obtained based on expertise as the case may be；, can by above-mentioned formula
To be used for quickly detecting to bituminous paving, corresponding compactness exponential quantity is first calculated according to compactness demand in actual test.When
After the completion of radar system is tested entire road survey line, the measuring point for finding out compactness characteristic underflow is checked.
Test general principle as follows：
In the course of work, the electromagnetic wave of fixed frequency is produced by Radar Signal Generator, by radar master controller to letter
A series of technical parameters such as number pulse width, phase, the dough softening, exponential gain are tuned frequency modulation, and carry out signal number of samples
Word, signal superposition processing, then by main controller by signal high-fidelity cable and screened shielded antanna by signal with 60 degree of direction
Launch in angular road surface, electromagnetic wave reflects after running into the aspect for having electrical property difference, received again by antenna, and former road is returned
Return in the signal receiving processor of radar, the radar signal after simple process point two-way transmission：Thunder is transmitted directly to all the way
Up to display, radar signal is directly displayed on a video display with color version, its display speed by " four chromogens reason "
It is synchronous with the holding of the antenna speed of service；Another road is entered in entry data memory, and internal memory is by all technical parameters together with radar signal
Data is preserved, to be played back and deeper into the processing of a step.The professional treatment of all radars, inversion interpretation software are equal
It can be arranged on all-purpose computer to complete, radar main controller, internal memory directly can carry out data communication with all-purpose computer, by thunder
The processing and explanation that carry out higher level is passed in computer machine up to data.Referring to Fig. 4 c.
In summary, the invention has the advantages that：
1st, radar antenna uses tubaeform horn antenna of the centre frequency for 2GHz, bandwidth more than 100%.
The designed investigation depth of the characteristic determination of medium and selection under all necessary base area of any GPR
Its working frequency.The centre frequency of ground exploring radar antenna is higher, and the relative dielectric constant and magnetic conductivity of underground medium are bigger, visits ground
The depth capacity that radar can be detected is more shallow.Minimum vertical resolution ratio and the centre frequency of radar antenna are inversely proportional, radar center
Frequency is lower, and its resolution ratio is higher.
When selecting the centre frequency of carrierfree ground exploring radar antenna, its max survey depth and minimum resolution are taken into account.
Bituminous pavement top thickness is generally 10-20cm, minimum pitch thickness about 4cm, and is divided into upper, middle and lower according to function division
Surface layer, each bitumen layer is due to using same or analogous material, and dielectric constant difference very little is difficult to know using existing radar equipment
Other interface, it is also quite faint even if there is signal reflex.Use centre frequency for 2GHz electromagnetic horn, surface layer could be obtained
High-resolution information.
The electromagnetic horn requirement of 2GHz centre frequencies and emitter have it is good match, including the impedance band more than 100%
Width, less time domain ring.Antenna time domain and frequency domain characteristic are surveyed using Agilent vector network analyzer N5242A
Examination.4 be that return loss, transfer function and the simulation result that antenna is surveyed are contrasted.Test result shows, in 0.5GHz~14GHz
Between, the return loss of antenna is less than -10dB.2GHz electromagnetic horns surface is carried out after absorbing material loading, antenna actual measurement knot
Fruit is consistent with simulation result trend.During compared to being loaded without absorbing material, loading aft antenna low frequency characteristic shows more preferably.
2nd, the distance of transmitting radar antenna and reception antenna is 30cm.
Because the dielectric constant of asphalt surface course is greater than air, therefore, reception antenna receives the echo letter of asphalt surface course
Number time delay, it is big compared to the echo-signal time delay obstructed without asphalt surface course, the dielectric constant of asphalt surface course can be calculated accordingly.Detection
During find, the measurement of the distance between reception antenna and transmitting antenna to the time difference has a certain impact.Emulated by CST
Free-space Method measurement model is built in software and finds (being shown in Table 1)：Within the specific limits, with the increase of distance, calculating is obtained
Dielectric constant gradually increase, error also relative increase；Error is minimum at 200mm；But apart from too near, the mutual shadow of antenna
Ring；Away from too far away, easily occur scattering, diffraction, consider and think that the distance between reception antenna and transmitting antenna are 30cm
Most preferably.
Influence of the distance of table 1 to simulation result
| Distance | Calculated value | Theoretical value | Error |
| 20cm | 6.0258 | 6 | 0.43% |
| 30cm | 6.1037 | 6 | 1.37% |
| 40cm | 6.2448 | 6 | 4.08% |
| 50cm | 6.3757 | 6 | 6.26% |
3rd, compactness index I is proposedcComputing formula
Laboratory pitch exemplar is obvious with existing in the middle of actual bituminous paving, and between different asphalt road surfaces
Difference in dielectric constant, this is that difference is caused and unavoidably by several factors, including materials during pavement construction match somebody with somebody difference with level,
The abrasion on road surface and water content difference etc. after being open to traffic, therefore the road surface dielectric constant density model directly set up do not possess generally
Applicability.It proposed in the influence that this species diversity is detected to compactness, this patent a kind of compactness index to come to pitch to overcome
Compactness of pavement situation is detected that it characterizes deviation of the road surface somewhere dielectric constant relative to entire road average dielectric constant
Degree.
4th, the computing formula of actual measurement compactness is proposed
Asphalt Pavement Compaction Degree Index index is fitted into analysis with actual compactness to find:Actual compactness refers to compactness
Good quantitative relationship model (see Fig. 5) can be obtained between number, the model can be represented by (formula 2).In Fig. 5, asterisk is to survey
The corresponding compacting degrees of data of amount point.
The present invention all parts embodiment can be realized with hardware, or with one or more processor transport
Capable software module is realized, or is realized with combinations thereof.In the present apparatus, PC is by realizing internet to equipment or device
Remote control, the step of accurately control device or device are each operated.The present invention is also implemented as being used to perform here
The some or all equipment or program of device of described method are (for example, computer program and computer program production
Product).Being achieved in that the program of the present invention can store on a computer-readable medium, and the file or document tool that program is produced
Having can be statistical, produces data report and cpk reports etc., and batch testing can be carried out to power amplifier and is counted.It should be noted that on
Stating embodiment, the present invention will be described rather than limits the invention, and those skilled in the art are not departing from
Replacement embodiment can be designed in the case of the scope of attached claim.In the claims, it will should not be located between bracket
Any reference symbol be configured to limitations on claims.Word "comprising" does not exclude the presence of member not listed in the claims
Part or step.Word "a" or "an" before element does not exclude the presence of multiple such elements.The present invention can be borrowed
Help include the hardware of some different elements and realized by means of properly programmed computer.If listing equipment for drying
Unit claim in, several in these devices can be embodied by same hardware branch.Word first,
Second and third use do not indicate that any order.These words can be construed to title.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or to which part technical characteristic progress equivalent；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of Asphalt Pavement Compaction Degree Index detection method, it is characterised in that including：
The echo-signal of radar transmissions is obtained, when the echo-signal detects for the radar to the measurement point of bituminous paving
The back wave received；
The echo-signal is analyzed, the corresponding dielectric constant of each measurement point is obtained；
The corresponding compactness index of each measurement point is obtained according to the dielectric constant；
The corresponding compactness of each measurement point is obtained according to the compactness index, and will the corresponding compactness work of each measurement point
For the compacting degrees of data of bituminous paving.
2. according to the method described in claim 1, it is characterised in that before the echo-signal of radar transmissions is obtained, the side
Method also includes：
Obtain the gps data of the radar collection；
Using the actual start of the bituminous paving as detection starting point, terminated by detection of the actual terminal of the bituminous paving
Point, with reference to the gps data, sets up detection path corresponding with the bituminous paving；
Correspondingly, the corresponding compactness of each measurement point is included as the compactness data of bituminous paving：
According to the detection path and the corresponding relation of the bituminous paving, each measurement point on the detection path is mapped to
On the bituminous paving；
Using the compactness of each measurement point as the compactness of the point with each measurement point on the bituminous paving with mapping relations, obtain
Take the compacting degrees of data of the bituminous paving.
3. method according to claim 2, it is characterised in that regarding the corresponding compactness of each measurement point as pitch
Before the compacting degrees of data on road surface, methods described also includes：
Compactness corresponding to each measurement point is detected, if detection knows that the corresponding compactness of each measurement point has abnormal,
Then check there is abnormal measurement point.
4. method according to claim 3, it is characterised in that corresponding obtaining each measurement point according to the dielectric constant
With before being detected to the corresponding compactness of each measurement point after compactness index, methods described also includes：
The compactness index of each measurement point is contrasted with default standard compaction degree index；
If contrast knows there is the measurement point that compactness index is less than the standard compaction degree index in each measurement point, to compacting
The measurement point that degree index is less than the standard compaction degree index is checked.
5. according to the method described in claim 1, it is characterised in that after the echo-signal of radar transmissions is obtained, the side
Method also includes：
The echo information is sent to display, so that the display shows the echo-signal；
Wherein, the speed of service of the display speed of the echo-signal and radar antenna keeps synchronous.
6. a kind of Asphalt Pavement Compaction Degree Index detection means, it is characterised in that including：
Acquisition module, the echo-signal for obtaining radar transmissions, the echo-signal is survey of the radar to bituminous paving
The back wave that amount point is received when being detected；
Analysis module, for analyzing the echo-signal, obtains the corresponding dielectric constant of each measurement point；
First processing module, for obtaining the corresponding compactness index of each measurement point according to the dielectric constant；
Second processing module, for obtaining the corresponding compactness of each measurement point according to the compactness index, and will each survey
Measure compacting degrees of data of the corresponding compactness of point as bituminous paving.
7. a kind of Asphalt Pavement Compaction Degree Index detecting system, it is characterised in that including：Asphalt road face pressure as claimed in claim 6
Solidity detection means, conveying arrangement and radar installations；
The conveying arrangement, for loading the Asphalt Pavement Compaction Degree Index detection means and the radar installations, and with default speed
Degree is travelled along bituminous paving；
The radar installations, for launching electromagnetic wave to the bituminous paving, receives the echo-signal returned, and by the echo
Signal transmission is to the Asphalt Pavement Compaction Degree Index detection means.
8. system according to claim 7, it is characterised in that in the transmitting antenna and reception antenna of the radar installations
Frequency of heart is 2Ghz, and band is wider than 100%；The distance of transmitting antenna and the real-time reception antenna is 30cm.
9. system according to claim 7, it is characterised in that longitudinal sampling interval of the radar installations is not more than
20cm, the pre-set velocity of the conveying arrangement is not less than 40km/h.
10. system according to claim 7, it is characterised in that the system also includes：GPS device；
The GPS device, the real-time latitude and longitude coordinates information for gathering conveying arrangement, and the latitude and longitude coordinates collected are believed
Breath is sent to the radar installations, so that radar installations bituminous paving according to the latitude and longitude coordinates Information locating
Measurement point.
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| CN107764642A (en) * | 2017-09-28 | 2018-03-06 | 中国十七冶集团有限公司 | A kind of red sandstone roadbed detection methods of compaction degree |
| CN109187668A (en) * | 2018-08-24 | 2019-01-11 | 武汉理工大学 | Compactness lossless detection method based on asphalt dielectric property |
| CN109683023A (en) * | 2018-12-26 | 2019-04-26 | 重庆交通大学 | It is compacted the thickness of bituminous surface at scene and the measurement method of dielectric constant |
| CN111190177A (en) * | 2019-12-31 | 2020-05-22 | 江苏中路工程技术研究院有限公司 | Method for recognizing radar amplitude characteristic interlayer condition of asphalt pavement |
| US20200256976A1 (en) * | 2019-02-08 | 2020-08-13 | Roger Roberts | Method for Assessing the Amount of Rolling Required to Achieve Optimal Compaction of Pre-Rolled Asphalt Pavement |
| CN111624596A (en) * | 2020-04-21 | 2020-09-04 | 中建路桥集团有限公司 | Road and bridge road acceptance detection system |
| CN111971435A (en) * | 2018-03-21 | 2020-11-20 | 沃尔沃建筑设备公司 | Asphalt density estimation system and related method for reducing signal noise |
| CN114075825A (en) * | 2021-11-09 | 2022-02-22 | 华中科技大学 | Geological radar-based roadbed compaction quality rapid automatic detection method and equipment |
| CN114737448A (en) * | 2022-03-22 | 2022-07-12 | 东南大学 | Ground penetrating radar-based intelligent asphalt pavement compaction system and method |
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| CN107764642A (en) * | 2017-09-28 | 2018-03-06 | 中国十七冶集团有限公司 | A kind of red sandstone roadbed detection methods of compaction degree |
| CN111971435A (en) * | 2018-03-21 | 2020-11-20 | 沃尔沃建筑设备公司 | Asphalt density estimation system and related method for reducing signal noise |
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| CN109187668A (en) * | 2018-08-24 | 2019-01-11 | 武汉理工大学 | Compactness lossless detection method based on asphalt dielectric property |
| CN109683023A (en) * | 2018-12-26 | 2019-04-26 | 重庆交通大学 | It is compacted the thickness of bituminous surface at scene and the measurement method of dielectric constant |
| US20200256976A1 (en) * | 2019-02-08 | 2020-08-13 | Roger Roberts | Method for Assessing the Amount of Rolling Required to Achieve Optimal Compaction of Pre-Rolled Asphalt Pavement |
| US11536827B2 (en) * | 2019-02-08 | 2022-12-27 | Geophysical Survey Systems, Inc. | Method for assessing the amount of rolling required to achieve optimal compaction of pre-rolled asphalt pavement |
| CN111190177A (en) * | 2019-12-31 | 2020-05-22 | 江苏中路工程技术研究院有限公司 | Method for recognizing radar amplitude characteristic interlayer condition of asphalt pavement |
| CN111624596A (en) * | 2020-04-21 | 2020-09-04 | 中建路桥集团有限公司 | Road and bridge road acceptance detection system |
| CN114075825A (en) * | 2021-11-09 | 2022-02-22 | 华中科技大学 | Geological radar-based roadbed compaction quality rapid automatic detection method and equipment |
| CN114075825B (en) * | 2021-11-09 | 2022-08-02 | 华中科技大学 | Geological radar-based roadbed compaction quality rapid automatic detection method and equipment |
| CN114737448A (en) * | 2022-03-22 | 2022-07-12 | 东南大学 | Ground penetrating radar-based intelligent asphalt pavement compaction system and method |
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