NL2031219B1 - Laser-based dynamic test device for lane line condition and method thereof - Google Patents

Laser-based dynamic test device for lane line condition and method thereof Download PDF

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Publication number
NL2031219B1
NL2031219B1 NL2031219A NL2031219A NL2031219B1 NL 2031219 B1 NL2031219 B1 NL 2031219B1 NL 2031219 A NL2031219 A NL 2031219A NL 2031219 A NL2031219 A NL 2031219A NL 2031219 B1 NL2031219 B1 NL 2031219B1
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reflector
laser
self
degree
degree reflector
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NL2031219A
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Dutch (nl)
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NL2031219A (en
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Su Wenying
He Huayang
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Res Inst Highway Mini Transp
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

A laser—based dynamic test device for lane line condition and a method thereof belong to the technical field of highway Heasurement. The device mainly consists of a Heasuring host, a laser, a receiver, a reflector, a half mirror, a screw—type light outlet regulating port, etc. After being emitted by the laser, the laser passes through a laser beam expanding and shaping module, is transmitted to a stray light filter by an internal optical lens group, is emitted by the screw—type light outlet regulating port through the stray light filter, and is irradiated on the measured object. After the retroreflection occurs on the measured object, the laser enters a device cavity through the stray light filter from the screw—type light outlet regulating port, and is transmitted to a bright vision filter through the internal optical lens group, and is finally received by the receiver.

Description

P1252 /NLpd
LASER-BASED DYNAMIC TEST DEVICE FOR LANE LINE CONDITION AND METHOD
THEREOF
TECHNICAL FIELD
A laser-based dynamic test device for lane line condition and a method thereof belong to the field of multifunctional rapid de- tection vehicles.
BACKGROUND ART
Road surface condition: the road surface condition mentioned in the present disclosure refers to the retroreflection optical performance condition of road markings. Retroreflection: retrore- flection of road markings is different from specular reflection and diffuse reflection, which refers to a special optical phenome- non that light is incident on road markings at an incident angle of 88.76 degrees and is then reflected at an included angle of 1.05 degrees with the incident light.
At present, manual means are used in the on-site detection of road traffic markings, that is, the inspectors use portable mark- ing retroreflection tester for on-site manual measurement, which not only has high labor intensity, low work efficiency and high detection cost, but also has limited data collection, weak repre- sentativeness, and limited reproducibility of detection data. At the same time, at the road site where traffic has been opened, such operation is extremely dangerous, and potential safety haz- ards are always present. In the investigation of the project, it is found that due to the above problems, some detection organiza- tions evaluate the actual engineering marking in the manner of de- tecting samples, resulting in the fact that the detection results cannot reflect the quality of the actual road traffic marking quality and the quality of road safety infrastructure could not be effectively guaranteed.
At present, the traditional technology and devices used to measure the road surface condition use a portable retroreflection marking measuring instrument based on a closed optical path using standard A light source as the main body.
The existing technology has the following disadvantages. 1) The measuring speed is slow. Since the device manufactured in the prior art needs to be self-calibrated manually prior to measurement, the measurement of a single marking takes about 5 minutes. 2) The existing technology relies heavily on environmental conditions. The measurement result is easily influenced by the ex- ternal light, so that the existing technology requires that the device and the measured object be in a closed environment. If there are other light sources between the device and the measured object, the device cannot measure and obtain accurate results, and the indication error will be greater than 100%. 3) Road traffic needs to be closed. Because it is a hand-held device, and the measuring speed is slow, it is necessary to close the traffic during road measurement to ensure the safety of sur- veyors. 4) The measurement indication error is large. The relative indication error of the prior art is +5%, which cannot meet the actual engineering requirements.
SUMMARY
The laser-based dynamic test device for lane line condition in the present disclosure mainly consists of a measuring host, a laser, a receiver, a reflector, a half mirror, a screw-type light outlet regulating port, etc. The hardware connection diagram is shown in FIG. 1.
The laser-based dynamic test device for lane line condition in the present disclosure is totally closed and is filled with in- ert gas therein. The overall protection level is better than IP67.
A wireless data transmission module, a data wired transmis- sion module, a host, a receiver motion module, a receiver, a bright vision filter, a reflector, a 45-degree reflector b, a 45- degree reflector c, a 45-degree bidirectional reflector, a reflec- tor inclination adjusting module, 45-degree reflector d, a half mirror, a 45-degree reflector e, a 45-degree reflector f, a 45- degree reflector g, a 45-degree reflector h, a laser beam expand-
ing and shaping module, a laser, a laser motion module, a self- calibration motion module, a self-calibration 45-degree reflector, a self-calibration standard sample and a stray light filter are all in the device cavity.
The cavity sampling port is located at the lower part of the device cavity, and a self-calibration standard sample is placed behind the cavity sampling port. When the cavity sampling port is opened, the self-calibration standard sample can be taken out, or the self-calibration standard sample can be fixed in the device cavity.
The screw-type light outlet regulating port is located on the right side of the device cavity. The screw-type light outlet regu- lating port takes its geometric central axis as the central axis, and can expand the aperture of the screw-type light outlet regu- lating port as needed.
The host, the data wired transmission module and the data wireless transmission module are installed on the left side of the device cavity. The data output by the host can be transmitted through the data wired transmission module or the data wireless transmission module. The receiver is installed on the receiver mo- tion module. A bright vision filter is installed in the front sec- tion of the receiver to adjust the spectral response of the re- ceiver so that the response error with the CIE standard bright vi- sion observer is not more than 3%.
The laser is installed on the laser motion module. A laser beam expanding and shaping module is installed in the front sec- tion of the laser to expand the diameter of the laser spot output by the laser to 10mm-200mm, so that the laser beam output by the laser is parallel light.
The 45-degree reflector a, the 45-degree reflector b, the 45- degree reflector c, the 45-degree reflector d, the 45-degree re- flector e, the 4b-degree reflector f, the 45-degree reflector 9, the 45-degree reflector h, the half mirror, and the 45-degree bi- directional reflector together form an optical lens group. The 45- degree reflector e, the 45-degree reflector f, the 45-degree re- flector g, the 45-degree reflector h, the half mirror, and the 45- degree bidirectional reflector together form an incident lens group. The 45-degree reflector a, the 45-degree reflector b, the 45-degree reflector c, the 45-degree reflector d, the half mirror, and the 45-degree bidirectional reflector together form the retroreflector optical lens group.
The 45-degree reflector a, the 45-degree reflector b, the 45- degree reflector c¢, the 45-degree reflector d, the 45-degree re- flector e, the 45-degree reflector f, the 45-degree reflector g, and the 45-degree reflector h have the same reflectivity F. The transmittance and the reflectivity of the half mirror are the same in numerical value. The reflectivity at both sides of the 45 bidi- rectional reflector is the same.
The same straight line horizontally passes through the cen- tral points of the 45-degree reflector h, the 45-degree reflector f, the 45-degree reflector e, the laser and the laser beam expand- ing and shaping module.
The same straight line horizontally passes through the cen- tral points of the 45-degree reflector a, the 45-degree reflector b, the 45-degree reflector d, the half mirror and the screw-type light outlet regulating port.
The same straight line horizontally passes through the cen- tral points of the 45-degree reflector c¢, the 45-degree reflector g, and the bidirectional reflector. The same straight line verti- cally passes through the central points of the receiver, the bright vision filter and the 45-degree reflector a.
The same straight line vertically passes through the central points of the 45-degree reflector b and the 45-degree reflector c.
The same straight line vertically passes through the central points of the 45-degree reflector d, the 45-degree reflector h and the 45-degree bidirectional reflector.
The same straight line vertically passes through the central points of the 45-degree reflector f and the 45-degree reflector g.
The same straight line vertically passes through the central points of the half mirror, the 45-degree reflector e and the laser beam cutter.
After being emitted by the laser, the laser passes through a laser beam expanding and shaping module, is transmitted to a stray light filter by an internal optical lens group, is emitted by the screw-type light outlet regulating port through the stray light filter, and is irradiated on the measured object. After the retroreflection occurs on the measured object, the laser enters a device cavity through the stray light filter from the screw-type 5 light outlet regulating port, and is transmitted to a bright vi- sion filter through the internal optical lens group, and is final- ly received by the receiver. The optical path of the laser from the laser to the screw-type light outlet regulating port is the same as that from the screw-type light outlet regulating port to the receiver.
The flow chart of the technical scheme of the laser-based dy- namic test device for lane line condition and a method thereof in the present disclosure is shown in FIG. 2, FIG. 3 and FIG. 4.
The present disclosure realizes the road surface condition measurement under the condition of an open optical path, which is strong in anti-interference ability and is not affected by exter- nal environment such as sunlight. The present disclosure has high measurement speed. The measurement time of a single marking is not more than 0.03s. The present disclosure does not need to close traffic. The present disclosure can be loaded on cars or unmanned aerial vehicles, and can be measured at a speed of 100 km/h. The present disclosure has high measurement accuracy, and the measure- ment indication error of the present disclosure can reach 2%.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of hardware connection of a displacement and movement time synchronization calibration device.
In FIG. 1, 1-1-a device cavity, 1-2-a cavity sampling port, 1-3-a screw-type light outlet regulating port, 2-1-a data wireless transmission module, 2-2-a data wired transmission module, 2-3-a host, 3-1-a receiver motion module, 3-2-a receiver, 3-3-a bright vision filter, 4-a 45-degree reflector a, 5-a 45-degree reflector b, 6-a 45-degree reflector c, 7-1-a 45-degree bidirectional re- flector, 7-2-a reflector inclination adjusting module, 8-a 45- degree reflector d, 9-a half mirror, 10-a 45-degree reflector e, ll-a 45-degree reflector f, 12-a 45-degree reflector g, 13-a 45- degree reflector h, 14-1-a laser beam expanding and shaping mod-
ule, 14-2-a laser, 14-3-a laser motion module, 15-1-a self- calibration motion module, 15-2-a self-calibration 45-degree re- flector, 16-a self-calibration standard sample, 17-a stray light filter, 18-a laser beam cutter
FIG. 2 is a flow chart of the technical scheme of a laser- based dynamic test device for lane line condition and a method thereof.
FIG. 3 is a propagation process of a laser beam in an inci- dent lens group.
FIG. 4 is a propagation process of a laser beam in a retrore- flector lens group.
FIG. 5 is a flow chart of a technical scheme of a specific example 1.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Example 1: hardware connection diagram and flow chart
The present disclosure can be used to measure the retrore- flective coefficient of road surface markings, and its flow chart is as follows.
Example 1: implementation process of the technical scheme
Referring to the flow chart of Example 1 shown in FIG. 5, the implementation process of the technical scheme of Example 1 is as follows. (1) After being powered on, the device becomes initialized, and all indicated values are reset. (2) The laser starts to work, and the laser beam is emitted from the inside of the device. (3) If the device is in the self-calibration mode at this time, self-calibration is carried out, the data collected by the receiver is recorded as InitData by the host, and the device exits from the self-calibration mode after the self-calibration is com- pleted, and the laser beam is emitted from the screw-type light outlet regulating port. (4) If the device is not in the self-calibration mode at this time, the laser beam is emitted from the screw-type light-emitting regulating port. (5) If the laser beam is emitted for the first time at this time, the first measurement needs to aim the screw-type light out- let regulating port at the air, and the laser beam is retrore- flected in the air and then injected through the screw-type light outlet regulating port. The receiver transmits the collected meas- urement data TestDataB to the host. After recording the data, the host calculates the retroreflection coefficient W, W = (InitData-
TestDataB) /KF2, where K is the reflectivity of the self- calibration standard sample, F is the reflectivity of the 45- degree reflector a, the 45-degree reflector b, the 45-degree re- flector c, the 45-degree reflector d, the 45-degree reflector e, the 45-degree reflector f, the 45-degree reflector g, and the 45- degree reflector h, and W is the inverse reflectivity coefficient. (6) If the laser beam is not emitted for the first time at this time, the screw-type light outlet regulating port aims at the road surface marking to be measured during measurement, so that the included angle between the emitted laser beam and the road surface marking is 88.76 degrees, and the laser beam is reversely reflected by the road surface marking and then injected through the screw-type light outlet regulating port. The receiver trans- mits the collected measurement data TestDataC to the host. After recording the data, the host calculates the retroreflection coef- ficient N, N = TestDataCKF 2/W, where K is the reflectivity of the self-calibration standard sample, F is the reflectivity of the 45- degree reflector a, the 45-degree reflector b, the 45-degree re- flector c¢, the 45-degree reflector d, the 45-degree reflector e, the 45-degree reflector f, the 45-degree reflector g, and the 45- degree reflector h, and W is the inverse reflectivity coefficient. (7) Repeat the above steps (2)-(6) if the measurement is con- tinued, and stop working if the measurement is not continued.

Claims (2)

CONCLUSIESCONCLUSIONS 1. Een op laser gebaseerd dynamisch testapparaat voor rijstrook- conditie, waarbij: het op laser gebaseerde dynamische testapparaat voor rijstrookcon- ditie volledig gesloten is en daarin is gevuld met inert gas; een draadloze datatransmissiemodule, een bedrade datatransmissiemodu- le, een host, een ontvangerbewegingsmodule, een ontvanger, een helderzichtfilter, een reflector, een 45 graden reflector b, een 45 gradenreflector c, een 45 graden bidirectionele reflector, een module voor het instellen van de helling van een reflector, een 45 graden reflector d, een halve spiegel, een 45 graden reflector e, een 45 graden reflector f, een 45 graden reflector g, een 45 gra- den reflector h, een module voor verbreding en vormgeving van een laserstraal, een laser, een laserbewegingsmodule, een zelfkalibre- rende bewegingsmodule, een zelfkalibrerende 45 graden reflector, een zelfkalibrerend standaardmonster en een strooilichtfilter zich allemaal in de holte van het apparaat bevinden.1. A laser-based dynamic lane condition tester, wherein: the laser-based dynamic lane condition tester is fully enclosed and filled with inert gas; a wireless data transmission module, a wired data transmission module, a host, a receiver motion module, a receiver, a clear vision filter, a reflector, a 45 degree reflector b, a 45 degree reflector c, a 45 degree bidirectional reflector, a tilt adjustment module of a reflector, a 45 degree reflector d, a half mirror, a 45 degree reflector e, a 45 degree reflector f, a 45 degree reflector g, a 45 degree reflector h, a module for broadening and shaping a laser beam, a laser, a laser motion module, a self-calibrating motion module, a self-calibrating 45 degree reflector, a self-calibrating standard sample, and a stray light filter are all contained within the cavity of the device. 2. Een op laser gebaseerde dynamische testmethode voor rijstrook- condities, waarbij: in de zelfkalibratiemodus de bewegingsmodule voor zelfkalibratie wordt bestuurd om de zelfkalibrerende 45 gra- denreflector naar dezelfde rechte lijn te verplaatsen als de 45 gradenreflector a, de 45-graden reflector b, de 45-graden reflec- tor d, de halve spiegel en de regelpoort voor de lichtuitlaat van het schroeftype om horizontaal door het middelpunt te gaan, en aan het einde van de zelfkalibratie of niet-zelf- kalibratiemodus, wordt de zelfkalibrerende bewegingsmodule bestuurd om de zelfkali- brerende 45 graden reflector naar de beginpositie te verplaatsen, de positie zorgt ervoor dat de zelfkalibrerende bewegingsmodule en de zelfkalibrerende 45 graden reflector de laserstraal niet ont- vangen; de invallende lichtintensiteit wordt berekend in de zelf- kalibratiemodus; de door de ontvanger uitgevoerde gegevens worden in de niet-zelfkalibratiemodus uitgelezen, en de retroreflectieco- efficiënt van de te meten wegdekmarkering wordt berekend; de re- gelpoort voor de lichtuitlaat van het schroeftype wordt bestuurd om zijn eigen opening aan te passen; de module voor het aanpassen van de hellingshoek van de reflector wordt geregeld om de hoek van de 45 graden bidirectionele reflector te regelen en de hoek van het invallende licht dat wordt uitgestraald door de regelpoort voor de lichtuitlaat van het schroeftype te veranderen; de bewe- gingsmodule van de ontvanger en de laserbewegingsmodule worden be- stuurd om de hoek van de ontvanger en de hoek van de laser te ver- anderen, om de emissie van de laserstraal bij de ingestelde in- valshoek te realiseren en de ontvanger in staat te stellen het ge- retroreflecteerde licht volledig te ontvangen.2. A laser-based dynamic test method for lane conditions, in which: in self-calibration mode, the self-calibration motion module is controlled to move the self-calibrating 45-degree reflector to the same straight line as the 45-degree reflector a, the 45-degree reflector b, the 45 degree reflector d, the half mirror and the screw type light outlet control port to pass through the center horizontally, and at the end of the self-calibration or non-self-calibration mode, the self-calibrating motion module is controlled to move the self-calibrating 45 degree reflector to the home position, the position will prevent the self-calibrating motion module and the self-calibrating 45 degree reflector from receiving the laser beam; the incident light intensity is calculated in self-calibration mode; the data output from the receiver is read out in the non-self-calibration mode, and the retro-reflection coefficient of the road marking to be measured is calculated; the screw type light outlet control port is controlled to adjust its own opening; the reflector inclination angle adjustment module is controlled to control the angle of the 45 degree bidirectional reflector and change the angle of the incident light emitted from the screw type light outlet control port; the receiver motion module and the laser motion module are controlled to change the angle of the receiver and the angle of the laser, so as to realize the emission of the laser beam at the set angle of incidence, and enable the receiver to to fully receive the retro-reflected light.
NL2031219A 2022-03-09 2022-03-09 Laser-based dynamic test device for lane line condition and method thereof NL2031219B1 (en)

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NL2031219B1 true NL2031219B1 (en) 2023-03-31

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