METHOD FOR FAST DETECTING PAVEMENT ASPHALT AND EARLY WARNING BASED ON INFRARED SPECTRUM BIG DATA

• US 20200132660A1
• Filed: 10/30/2018
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Gansu Provincial Transportation Planning Survey & Design Institute Co., Ltd.
• Original Assignee: Gansu Province Transportation Planning Survey & Design Institute Company Limited
• Inventors: Li, Xiaomin, Zhao, Jingzhuo, Wei, Dingbang, Zhang, Guohong, Zhang, Fukui, Wei, Qiang, Wang, Hui, Cao, Qingxia, Ding, Min
• Granted Patent: US 10,768,164 B2
• Time in Patent Office: Days
• CPC Class Codes: E01C 23/01 Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports form rails E01C19/50; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs E01C23/07 takes precedence; measuring roughness or irregularity in general G01B
• CPC Class Codes: G01N 21/35 using infrared light G01N21/39 takes precedence
• CPC Class Codes: G01N 21/3563 for analysing solids; Preparation of samples therefor
• CPC Class Codes: G01N 21/552 Attenuated total reflection
• CPC Class Codes: G01N 33/42 Road-making materials G01N33/38 takes precedence

Abstract

A method for fast detecting pavement asphalt and early warning based on infrared spectrum data. Infrared spectrum data of standard sample asphalt is collected by adopting an infrared spectrometer, to establish an infrared spectrum database of standard sample asphalt. The infrared spectrum database of the standard sample asphalt and basic asphalt information is introduced into a cloud server through a spectrum input module. A database-matching calculation method and a threshold value is set through a spectrum-matching analysis module. The infrared spectrum data and engineering information of the tested asphalt is collected and uploaded to a cloud platform for storage. A matching calculation between the uploaded data and the spectrograms in the infrared spectrum database of the standard sample asphalt through the cloud server is conducted. An asphalt matching result is outputted to a display terminal. An early-warning message is pushed by the cloud server if a test result is not-match.

Claims

1. A method for fast detecting pavement asphalt and early warning based on infrared spectrum data, comprising:

collecting infrared spectrum data of standard sample asphalt by adopting a Fourier infrared spectrometer, to establish an infrared spectrum database of standard sample asphalt;

introducing the infrared spectrum database of the standard sample asphalt and basic asphalt information into a cloud server through a spectrum input module, and setting a database-matching calculation method and a threshold value through a spectrum-matching analysis module;

collecting and uploading the infrared spectrum data and engineering information of the tested asphalt to a cloud platform for storage;

conducting matching calculation between the uploaded data and the spectrograms in the infrared spectrum database of the standard sample asphalt through the cloud server, and outputting an asphalt matching result to a display terminal; and

pushing an early-warning message by the cloud server if a test result is a not-match.

2. The method according to claim 1, wherein the Fourier infrared spectrometer uses attenuated total reflection accessories to collect an infrared spectrogram of asphalt, with spectral conditions set as follows:

a scanning range of 650 cm<sup>−

1</sup> to 4000 cm<sup>−

1</sup>, the number of scanning of 32, and a resolution of 4 cm<sup>−

1</sup>.

3. The method according to claim 2, wherein the specific method for collecting the infrared spectrogram of asphalt by the attenuated total reflection accessory is:

firstly scanning the background according to spectrum conditions as set, heating a scraper blade and using the scraper blade to obtain an asphalt sample, uniformly coating the asphalt sample onto the surface of the attenuated total reflection accessory, and collecting and storing the infrared spectrogram of asphalt.

4. The method according to claim 1, wherein the infrared spectrum database of the standard sample asphalt is established according to the refineries, the standard sample asphalt should be asphalt from a refinery in different years and different production batches, each kind of standard sample asphalt from the refinery is not less than 500, and the year is not less than 3.

5. The method according to claim 1, wherein the basic asphalt information comprises a manufacturer, a production date, a production batch, a sample source, a sampling date, a sample testing date and device information of the asphalt.

6. The method according to claim 1, wherein there are three calculation methods for database matching of asphalt, which respectively are:

the first calculation method;

the cloud server sets the standard peak sensitivity threshold of the infrared spectrum absorption peak of the database as 90, and automatically identifies the locations and number of characteristic absorption peaks of standard sample asphalt, wherein as a matching condition, if one peak location is different, the asphalt does not match;

the second calculation method;

a full spectrum peak area calculation method, wherein the spectrum matching analysis module of the cloud server performs calculus split calculation on each spectral line in the standard sample asphalt database according to the characteristic absorption peak area selected in the first calculation method, splits the spectral lines in the defined interval into trapezoids for several times, calculates the area of each split trapezoid according to the trapezoid area S, adds up all areas of the trapezoids in this interval to obtain data of each peak area, and calculates the ratio of the peak areas to obtain the data of peak area ratio, as follows

S=(a+c)×

h÷

2

wherein S represents an area of a trapezoid, a represents an upper bottom length of the trapezoid, c represents a lower bottom length of the trapezoid, and h represents a height of the trapezoid;

wherein aggregation function calculation is performed on data of the peak areas and peak area ratios of characteristic absorption peaks of all spectral curves in the database, to obtain the maximum and minimum values of the peak area and peak area ratio in each interval, and the maximum and minimum values serve as determination threshold of the database, such that when the data of the peak area and peak area ratio for the infrared spectrogram of asphalt is in this range, there is a match, and otherwise, there is no match; and

the third calculation method;

a full spectrum matching calculation method, wherein based on implementation of matching in the calculation method 1, the difference between the absorbance values of two spectral lines at the characteristic absorption peak is calculated, and the sum of all the difference values is calculated;

the smaller the sum of the difference values between the two spectral lines, the more similar the two spectral lines are; and

the formula for calculating the minimum distance between the i-th spectrum in the spectrum database and the tested spectrum x_k is as follows;

d_i(x_k)=[Σ

_j=1ⁿ(x_j−

M_j)²]^1/2

wherein n represents the number of total characteristic absorption peaks of the spectrum;

x_j represents the absorbance value of the j-th absorption peak of the testing spectrum x_k; and

M_j represents the absorbance value of the j-th absorption peak of the i-th spectrum in the spectrum database; and

the distance between the tested spectrum and each spectrum in the spectrum database is calculated one by one, and the spectrum with the smallest distance is selected as the matching result of the tested spectrum.

7. The method according to claim 1, wherein the engineering information of asphalt comprises at least one of the following:

a project name, a section name, a transport vehicle, a sampling date, a sampling time, an upload time, and device information.

8. The method according to claim 6, wherein the first method and the third method are used to firstly select a standard sample asphalt database of a refinery, and then determine whether the tested asphalt is the asphalt coming from the refinery.

9. The method according to claim 6, wherein the first method and the second method are used to conduct spectrogram comparison between the tested asphalt and all asphalt of the database, to select the spectrum in the database with the smallest absorbance difference sum as the matching result of the tested spectrum.

10. The method according to claim 1, wherein the equipment models of the Fourier infrared spectrometers used for collecting the infrared spectrum of the standard sample asphalt and the tested asphalt are completely the same.