CN108931562A - A kind of lossless detection method of the uneven mixture dielectric constant of pair of large scale - Google Patents

A kind of lossless detection method of the uneven mixture dielectric constant of pair of large scale Download PDF

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CN108931562A
CN108931562A CN201810617112.XA CN201810617112A CN108931562A CN 108931562 A CN108931562 A CN 108931562A CN 201810617112 A CN201810617112 A CN 201810617112A CN 108931562 A CN108931562 A CN 108931562A
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dielectric constant
grid
mixture
large scale
uneven
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CN108931562B (en
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罗蓉
孙通
于晓贺
杨洋
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Wuhan University of Technology WUT
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants

Abstract

The invention discloses the lossless detection methods of the uneven mixture dielectric constant of a kind of pair of large scale.Prepare the uneven cuboid mixture of large scale；Length is measured, and records data；Two faces maximum to its area are divided using the grid of 60mm × 60mm, and draw grid with marking pen；It is measured using dielectric constant instrument Percometer；The dielectric constant values of each grid are averaged；Track plate is simulated in MATLAB and establishes 30 × 30 × 5 three-dimensional grid models, and above and below is measured into gained dielectric constant values and is imported into model；With three layers among linear equation fitting three-dimensional grid model of dielectric constant values, 4500 dielectric constant values of each position of mixture are obtained, the overall dielectric constant value of mixture is finally obtained using the calculation method of average value statistics.

Description

A kind of lossless detection method of the uneven mixture dielectric constant of pair of large scale
Technical field
The invention belongs to field of road, are related to a kind of non-destructive testing side of uneven mixture dielectric constant of large scale Method.
Background technique
With the past of highway in China construction peak period, a large amount of road needs to carry out maintenance.Today, most is high Fast highway and ordinary highway generally use bituminous pavement as its main road surface form, generally take the quality testing of road Core boring sampling method not only expends a large amount of manpower and material resources, can also damage to road, and furthermore its detection efficiency is low, detects incomplete The problems such as face, also annoyings always road maintenance worker now.Therefore the Ground Penetrating Radar detection method of rising in recent years, because The pavement detection potentiality of its efficient, comprehensive, lossless advantage, Ground Penetrating Radar have obtained extensive approval.
It is well known that the testing principle of Ground Penetrating Radar is the dielectric property difference by ground surface material, from the table of back wave The essential informations such as road surface thickness can only be read on seeing, and to detect the indexs such as the compactness, water content, bitumen content of road also needs The dielectric property of road pavement is wanted further to be studied, therefore the dielectric constant for accurately measuring pavement of road is particularly important. There are many kinds of the methods of current measuring medium material dielectric constant, including the resonance method, transmission bounce technique, time domain measurement method and freedom Space law etc., wherein the resonance method and classical transmission bounce technique require to prepare special mold and sample, or to sample Drill core cutting is carried out to obtain required size, has belonged to loss measurement.And time domain measurement rule is because its measurement point is single, and main For measuring ultrathin material, test result is only capable of representing the dielectric constant of a certain very low range uniform dielectric, does not have measurement The function of large scale non-uniform mixing material dielectric constant.To sum up existing dielectric constant measurement method is mostly to belong to damage survey Amount, or measured for small size uniform dielectric, road engineering reality can not be met well, and it is non-homogeneous for large scale The nondestructive measurement of mixture dielectric constant helps to improve Ground Penetrating Radar detection accuracy, more fitting real road, but also due to its The large scale and heterogeneity of mixture, conventional method are difficult to carry out it measurement of dielectric constant.
Therefore currently there is an urgent need to one kind can satisfy in large scale, non-uniform dielectric, non-fully contact measurement condition The lower non-destructive measuring method for guaranteeing sample, can completely measure the overall dielectric characteristic of large-scale mixture, thus preferably anti- The dielectric property of this composite material of uniformity and asphalt pavement mixture that paves of Practical Project road is reflected, is promoted and visits land mine The detection accuracy and engineer application range reached.
Summary of the invention
The test method detected it is an object of the present invention to propose the uneven mixture dielectric constant of a kind of pair of large scale, The overall dielectric constant of large-scale mixture can be completely measured, to reflect pave uniformity and the pitch of Practical Project road The dielectric property of this composite material of paving mix detects the essence of road quality and every road engineering index for Ground Penetrating Radar Degree is provided fundamental basis.
In order to achieve the above objectives, as follows using technical solution：
The detection method of the uneven mixture dielectric constant of a kind of pair of large scale, includes the following steps：
1) the uneven cuboid mixture of large scale is prepared；Length is measured, and records data；
2) two faces maximum to its area are divided using the grid of 60mm × 60mm, and draw net with marking pen Lattice；
3) it is measured using dielectric constant instrument Percometer (abbreviation PM), selects suitable probe and probe mode； Air is measured and (is demarcated to PM), after calibration, then by PM preheat 1-2 minutes；
4) each grid carries out four measurements that rotation angle is 90 °, records dielectric constant values and measurement temperature, grid Dielectric constant values be averaged；
5) track plate being simulated in MATLAB and establishing 30 × 30 × 5 three-dimensional grid models, by above and below, (area is maximum Two faces) measurement gained dielectric constant values imported into model, two in the average dielectric constant value representative model of each grid 36 numerical value of 6 × 6 grid on 30 × 30 top layer and bottom (i.e. upper and lower layer respectively imports 900 data)；
6) it is calculated in MATLAB, three layers among three-dimensional grid model of dielectric constant values is fitted with linear equation, 4500 dielectric constant values of each position of mixture are obtained, mixture is finally obtained using the calculation method of average value statistics Overall dielectric constant value.
According to the above scheme, the length and width of step 1 mixture largest face is both needed to be greater than 60mm.
According to the above scheme, measurement area is completely covered in step 2 grid area；If can not be completely covered, then non-covering part Point dielectric constant be set to most nearby dielectric constant values of grid therewith.
According to the above scheme, before step 4 measures, probe is lifted and is placed on above test specimen at the position of 5-10cm, At this time the registration E of PM be 1.0, with this come determine PM work normally.
According to the above scheme, linear equation model is as follows in step 6：
An=A1+(A1-A5)*(n-1)/4
In formula, n is the model number of plies；AnFor the dielectric constant data of n-th layer；A1Dielectric for three-dimensional grid model top layer is normal Number data；A5For the dielectric constant data of three-dimensional grid model bottom.
The present invention carries out large-scale mixture by grid dividing method, using the zonule dielectric constant values that can be measured whole Body divides, and analyzes fitting data as a result, obtaining the dielectric constant values of mixture entirety by MATLAB software, allows to directly The measurement of large scale non-uniform mixing material dielectric constant is carried out, no matter from the reasonability of test method, test accuracy and reality Testing on the time has compared with much progress, specific as follows：
(1) measurement of large scale non-uniform mixing material dielectric constant under indoor conditions can be achieved
Test method uses PM instrument as the new method of mixture dielectric constant in measuring chamber using free-space Method, can To measure the overall dielectric constant of the uneven mixture of large scale, for more previous single-point small range measurement, the test method More effectively simulate the dielectric property of this composite material of Practical Project bituminous pavement.
(2) test class is carried out under free space and effectively accelerates test progress, shortens test period
Test method, which can carry out targeted test body without test consumable, to be tested, and entire process of testing is simple, entire to be situated between Measuring electrical constant test is time-consuming extremely short, is 300mm for length and width, with a thickness of the track plate of 50mm, counts measurement and data processing in Time, need 1 hour, and conventional use dielectric constant test macro then needs former test specimen drill core being cut to conform to measuring scale Very little small specimen, average time-consuming was at 1 day or more.
(3) stringency of test is high, highly reliable
Original method need to by big test specimen drill core, be cut into multiple small specimens and carry out dielectric constant measurements, due to small specimen size It is too small, it will cause test specimen abrasion in drill core cutting, test accuracy is lower, and new method is carried out using free-space Method using PM Indoor mixture dielectric constant measurement is fitted mixture construction without damaging to former test specimen, and using MATLAB three-dimensional Size improves the precision and reliability of test result to calculate the overall dielectric constant of mixture.
Detailed description of the invention
Attached drawing 1：The big surface grids of track piauzite mixture divide figure；
Attached drawing 2：MATLAB simulation drawing.
Specific embodiment
For clearly a kind of test method of large scale non-uniform mixing material dielectric constant, below with a typical test For, technical solution of the present invention is further illustrated, but not as limiting the scope of the invention.
Prepare Asphalt Mixture Experiment sample
Test forms track piauzite mixture using track forming instrument, used in pitch be that Hubei state creates high green wood Expect the SBS modified pitch that limited liability company provides, gathers materials for the basalt of Hubei Province Ezhou building stones factory production, molding vehicle Rut plate length and width is 300mm, with a thickness of 50mm.
Grid dividing is carried out to mixture
Since the size of this test track piauzite mixture largest face is 300mm × 300mm, length and width is 60mm Integral multiple, therefore be divided into 5 × 5 25 grids, each grid is 60mm × 60mm, and drawn with marking pen mark, Same work is also done to reverse side, referring to shown in attached drawing 1.
Debug PM
It selects diameter to connect for the probe SF169 of 60mm with PM host, opens PM, correctly surveyed according to the selection of probe model Amount mode shows that H169C is that setting is correct at this time on display screen upper left side；Then PM is demarcated, probe is placed in sky In gas, screen shows that E is 1.0 at this time, that is, demarcates successfully, preheating can start to measure after 1-2 minutes.
Start to measure
Probe vertical is placed in the lattice finished, keeps probe edge and lattice side length tangent, at this time PM screen It can show and be recorded after the value of E, pending data are stablized；It is rotated by 90 °, is measured four times altogether, according to same step three times again 24 grids of remainder are measured, the positive dielectric constant data summarization of track plate is obtained and is listed in the table below in 1.
Table 1
The dielectric constant data summarization of track back is in the following table 2.
Table 2
Threedimensional model is established in MATLAB
Track plate is simulated in MATLAB and establishes 30 × 30 × 5 three-dimensional grid models, simulates track plate structure size, it will The dielectric constant values of above and below are imported into model, are represented 6 in MATLAB with the dielectric constant values of grid each in actual division 36 numerical value of × 6 three-dimensional grid, i.e., upper and lower layer respectively import 900 data；
Data processing
It is calculated in MATLAB, is fitted intermediate three layers of dielectric constant values with following formula (1),
An=A1+(A1-A5)*(n-1)/4
In formula, n is the model number of plies；AnFor the dielectric constant data of n-th layer；A1For the dielectric constant data of model top layer；A5 For the dielectric constant data of model bottom.
Track plate simulation drawing as shown in Figure 2, wherein dark color represents that dielectric constant values are small, and it is big that light color represents dielectric constant values； Color data corresponds to stick, and it is 3.2 that black, which corresponds to dielectric constant values, white corresponding 5.7.The each position of mixture is obtained after being expanded 4500 dielectric constant values set, finally use the calculation method of average value statistics obtain the dielectric constant values of entire mixture for 4.6499。

Claims (5)

1. the detection method of the uneven mixture dielectric constant of a kind of pair of large scale, it is characterised in that include the following steps：
1) the uneven cuboid mixture of large scale is prepared；Length is measured, and records data；
2) two faces maximum to its area are divided using the grid of 60mm × 60mm, and draw grid with marking pen；
3) it is measured using dielectric constant instrument Percometer, selects suitable probe and probe mode；Air is surveyed Amount, after calibration, then by PM preheat 1-2 minutes；
4) each grid carries out four measurements that rotation angle is 90 °, records dielectric constant values and measurement temperature, Jie of grid Permittivity values are averaged；
5) track plate being simulated in MATLAB and establishing 30 × 30 × 5 three-dimensional grid models, above and below is measured into gained dielectric constant Value is imported into model, in the average dielectric constant value representative model of each grid 6 × 6 on two 30 × 30 top layers and bottom Grid 36 numerical value；
6) it is calculated in MATLAB, with three layers among linear equation fitting three-dimensional grid model of dielectric constant values, is obtained 4500 dielectric constant values of each position of mixture finally obtain the entirety of mixture using the calculation method of average value statistics Dielectric constant values.
2. as described in claim 1 to the detection method of the uneven mixture dielectric constant of large scale, it is characterised in that step 1 is mixed The length and width for closing material largest face is both needed to be greater than 60mm.
3. as described in claim 1 to the detection method of the uneven mixture dielectric constant of large scale, it is characterised in that step 2 net Measurement area is completely covered in lattice area；If can not be completely covered, then the dielectric constant of unmasked portion is set to therewith most nearby The dielectric constant values of grid.
4. as described in claim 1 to the detection method of the uneven mixture dielectric constant of large scale, it is characterised in that step 4 into Before row measurement, probe is lifted and is placed on above test specimen at the position of 5-10cm, the registration E of PM is 1.0 at this time, is come with this true Determine PM normal work.
5. as described in claim 1 to the detection method of the uneven mixture dielectric constant of large scale, it is characterised in that in step 6 Linear equation fitting is as follows：
An=A1+(A1-A5)*(n-1)/4
In formula, n is the model number of plies；AnFor the dielectric constant data of n-th layer；A1For the dielectric constant number of three-dimensional grid model top layer According to；A5For the dielectric constant data of three-dimensional grid model bottom.
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CN111487296A (en) * 2020-04-21 2020-08-04 郑州星驰智能科技有限公司 Method for detecting mixing uniformity of powdery material
CN111487296B (en) * 2020-04-21 2022-11-01 郑州星驰智能科技有限公司 Method for detecting mixing uniformity of powdery material

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