EP0774395A2 - Method and device for detecting a lubricating film on rails - Google Patents
Method and device for detecting a lubricating film on rails Download PDFInfo
- Publication number
- EP0774395A2 EP0774395A2 EP96113791A EP96113791A EP0774395A2 EP 0774395 A2 EP0774395 A2 EP 0774395A2 EP 96113791 A EP96113791 A EP 96113791A EP 96113791 A EP96113791 A EP 96113791A EP 0774395 A2 EP0774395 A2 EP 0774395A2
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- EP
- European Patent Office
- Prior art keywords
- laser
- rail
- lubricating film
- detectors
- laser beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000001050 lubricating effect Effects 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 7
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000001629 suppression Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000011234 economic evaluation Methods 0.000 description 2
- 238000001499 laser induced fluorescence spectroscopy Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 238000004162 soil erosion Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
Definitions
- the invention relates to a method for detecting lubricating film on rails.
- Lubricating film causes major problems in operational management and considerable damage to the track and vehicles on the railways.
- Lubrication film reduces the coefficient of friction between the wheel and rail to such an extent that trains "stop" on slight inclines and cause delays and malfunctions. The problem occurs particularly with freight trains, occasionally also with passenger trains. The timing of the start is highly critical.
- the lubricating film is a covering that consists of immissions from industry, households and road traffic and, depending on the location of the lubricating film location, also from natural substances such as soil erosion and leaves. Foliage is primarily classified as a catalyst. The triggering factors are temperature and humidity and the falling below the dew point due to unfavorable temperature differences between the rail and the air layers close to the ground.
- a targeted detection is not carried out.
- Lubrication film spots can possibly be registered by a friction wheel that runs on the vehicle, by reducing the liability between the wheel and the rail.
- a disadvantage of this method is that the lubricating film is only recognized in the acute state.
- permanent "almost sliding" contact of the friction wheel with the rail can damage the rail and the friction wheel system.
- Pattern recognition systems are also ruled out because the lubricant film substance appears completely different in shape and extent and economic evaluation and reproducibility are not possible here either.
- the invention has for its object to provide a method that detects the presence of the different substances forming the lubricating film on the rail regardless of the weather, so that a targeted cleaning of the running surface of the rails, ie. H. Removal of the lubricating film can be carried out before the described problems occur.
- All facilities such as the high pressure water system, the sensors and the control and evaluation electronics are installed on a special rail vehicle.
- This vehicle travels the critical route areas, constantly checking the rail surfaces and detecting the lubricating film points. In the final state of the system, when the lubricating film is detected, it is immediately removed by the cleaning equipment during the journey and the cleaning quality is determined by a further detection during the same journey.
- sensors using laser technology are able to detect rail areas with critical contamination.
- the concept of the sensor is based on the consideration that the reflection behavior of the rail surface strongly depends on the surface condition. The reflection of the laser beam is therefore influenced in a characteristic manner.
- a beam expansion to a diameter of approx. 10 mm suppresses the influence of local unevenness in the rail.
- An embodiment of the invention is shown in the form of a basic arrangement in the drawing.
- a measuring head 1 on the rail vehicle which is connected to the rail vehicle in a suitable manner so that the rail 2 z. B. can be scanned via a window 3 and rubber apron 4 by means of the parallel laser beam 5, which is supplied and expanded by a laser 6 starting from a fiber optic 7 and amorphous collimator optic 8 to an expansion optic 9.
- the expanded parallel laser beam 5 (e.g. a HeNe laser or diode laser) hits the rail 2 at a certain angle.
- the signals of the two detectors 12, 13 are via preamplifiers 14, 15 of an evaluation unit 16 z.
- the sensor is able to distinguish cases A, B and C (no lubricating film) from cases D and E (lubricating film available).
- the reflected radiation is registered with the aid of two detectors, the detectors being arranged such that one Detector receives the laser radiation in specular reflection and a second detector receives the laser radiation in diffuse reflection.
- the control cabinet with z. B. 19 '' slide-in frame 17 for the arrangement with power supply 18, microcontroller 19, amplification electronics 20, PC interface 21 and power supply 22 for the laser 6 is arranged at a suitable location in the rail vehicle.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Detektieren von Schmierfilm auf Schienen. Schmierfilm verursacht bei den Bahnen große Probleme in der Betriebsführung und erhebliche Schäden an Fahrweg und Fahrzeugen.The invention relates to a method for detecting lubricating film on rails. Lubricating film causes major problems in operational management and considerable damage to the track and vehicles on the railways.
Durch Schmierfilm wird der Reibwert zwischen Rad und Schiene so weit reduziert, daß als Folge davon Züge in leichten Steigungen "liegenbleiben" und Verspätungen und Betriebsstörungen verursachen. Das Problem tritt besonders bei Güterzügen, vereinzelt auch bei Reisezüge auf. Kritisch ist hierbei in hohem Maße der Zeitpunkt des Anfahrens.Lubrication film reduces the coefficient of friction between the wheel and rail to such an extent that trains "stop" on slight inclines and cause delays and malfunctions. The problem occurs particularly with freight trains, occasionally also with passenger trains. The timing of the start is highly critical.
Weitere, noch schwerwiegendere Folgen können entstehen, wenn die Bremsen von Zügen blockieren. Dabei wird der Bremsweg länger und es können Betriebsgefahren entstehen.Further, even more serious consequences can arise if the brakes of trains block. The braking distance becomes longer and operational risks can arise.
Durch das Blockieren der Bremsen entstehen darüber hinaus an den Radsätzen von Triebfahrzeugen und Wagen Flachstellen, deren Behebung erheblichen Aufwand verursacht.By blocking the brakes, there are also flat spots on the wheelsets of traction vehicles and cars, the removal of which causes considerable effort.
Bei Schmierfilm handelt es sich um einen Belag, der aus Immissionen von Industrie, Haushalten und dem Straßenverkehr und je nach Lage der Schmierfilmstelle auch aus Substanzen aus der Natur, wie Bodenerosionen und Laub besteht. Dabei wird Laub in erster Linie als Katalysator eingestuft. Auslösende Faktoren sind Temperatur und Feuchtigkeit und die durch ungünstige Temperaturdifferenzen zwischen Schiene und bodennahen Luftschichten entstehende Taupunktunterschreitung.The lubricating film is a covering that consists of immissions from industry, households and road traffic and, depending on the location of the lubricating film location, also from natural substances such as soil erosion and leaves. Foliage is primarily classified as a catalyst. The triggering factors are temperature and humidity and the falling below the dew point due to unfavorable temperature differences between the rail and the air layers close to the ground.
Als Gegenmaßnahme ist es erforderlich, den Schmierfilm zu detektieren und mit Hochdruckwasser zu entfernen.As a countermeasure, it is necessary to detect the lubricating film and remove it with high pressure water.
Bislang wird das Auftreten von Schmierfilm lediglich vom Fachpersonal (z. B. Triebfahrzeugführer) gemeldet.So far, the occurrence of lubricating film has only been reported by specialist personnel (e.g. driver).
Eine gezielte Detektion wird nicht durchgeführt.A targeted detection is not carried out.
Schmierfilmstellen lassen sich möglicherweise durch ein Reibrad, das am Fahrzeug mitläuft, durch Nachlassen der Haftung zwischen Rad und Schiene registrieren. Nachteilhaft bei diesem Verfahren ist, daß der Schmierfilm nur im akuten Zustand erkannt wird. Darüber hinaus kann es durch die permanente "fast gleitende" Berührung des Reibrades mit der Schiene zu Schäden an der Schiene und am Reibradsystem kommen.Lubrication film spots can possibly be registered by a friction wheel that runs on the vehicle, by reducing the liability between the wheel and the rail. A disadvantage of this method is that the lubricating film is only recognized in the acute state. In addition, permanent "almost sliding" contact of the friction wheel with the rail can damage the rail and the friction wheel system.
Die Verwendung von Video- und Wärmebildkamera scheidet aus, da sich die hierbei anfallenden Datenmengen in einer Größenordnung bewegt, die eine wirtschaftliche Auswertung und vor allem eine unmittelbare Überprüfung des Schienenzustandes ausschließt.The use of video and thermal imaging cameras is ruled out because the amount of data generated is of a magnitude that precludes an economic evaluation and, above all, an immediate check of the rail status.
Mustererkennungssysteme scheiden ebenfalls aus, da die Schmierfilmsubstanz in Form und Ausdehnung vollkommen unterschiedlich auftritt und auch hier eine wirtschaftliche Auswertung und Reproduzierbarkeit nicht möglich ist.Pattern recognition systems are also ruled out because the lubricant film substance appears completely different in shape and extent and economic evaluation and reproducibility are not possible here either.
Die DE 43 12 876 A1 beschreibt ein Meßsystem zur Messung und Bestimmung der Veränderung an der Lauffläche eines Rades von Schienenfahrzeugen auf der Basis von geometrischen Abstandsmessungen. Sowohl Aufgabenstellung als auch Meßprinzip unterscheiden sich dabei grundsätzlich von der Erfindung, da es weder um die Bestimmung von Schmierfilm auf Schienenoberflächen geht, noch das Prinzip der Intensitätsmessung von direkt und diffus reflektiertem Laserlicht eingesetzt wird.DE 43 12 876 A1 describes a measuring system for measuring and determining the change in the tread of a wheel of a rail vehicle on the basis of geometric distance measurements. Both the task and the measuring principle differ fundamentally from the invention, since it is not about determining the lubricating film on rail surfaces, nor is the principle of intensity measurement of directly and diffusely reflected laser light used.
Die Literaturstelle Measuring engine oil films In: Automotive Engineering, Jan. 1992, Vol. 100, Nr. 1, S. 15 - 18, beschreibt ein Meßsystem zur Bestimmung der Dicke von Ölfilm auf Motorzylinderinnenflächen mittels laserinduzierter Fluoreszenz. Dabei wird die zu untersuchende Substanz selektiv mit einem Laser angeregt und das daraus resultierende Fluoreszenzlicht beobachtet. Es handelt sich auch in diesem Fall nicht um eine Intensitätsmessung von direkt und diffus reflektiertem Laserlicht.The literature reference Measuring engine oil films In: Automotive Engineering, Jan. 1992, Vol. 100, No. 1, pp. 15-18, describes a measuring system for determining the thickness of oil film on the inside of an engine cylinder by means of laser-induced fluorescence. The substance to be examined is selectively excited with a laser and the resulting fluorescent light is observed. In this case, too, it is not an intensity measurement of directly and diffusely reflected laser light.
Was die Aufgabenstellung betrifft, so ermöglicht laserinduzierte Fluoreszenz mit einer Apparatur nur die Untersuchung einer eng begrenzten Substanzklasse, wie hier z.B. Motorenöl. Beide Schriften basieren zwar auf Lasermeßtechnik, beinhalten aber zwei völlig andersgeartete Meßaufgaben.As far as the task is concerned, laser-induced fluorescence with one apparatus only enables the investigation of a narrowly limited class of substances, as here e.g. Motor oil. Both documents are based on laser measurement technology, but contain two completely different types of measurement tasks.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, das witterungsunabhängig das Vorhandensein der den Schmierfilm bildenden unterschiedlichen Substanzen auf der Schiene erkennt, so daß eine gezielte Reinigung der Fahrfläche der Schienen, d. h. Entfernen des Schmierfilms, vorgenommen werden kann, bevor es zu den beschriebenen Störungen kommt.The invention has for its object to provide a method that detects the presence of the different substances forming the lubricating film on the rail regardless of the weather, so that a targeted cleaning of the running surface of the rails, ie. H. Removal of the lubricating film can be carried out before the described problems occur.
Erfindungsgemäß wird diese Aufgabe durch die in Anspruch 1 aufgeführten Merkmale gelöst.According to the invention, this object is achieved by the features listed in claim 1.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen dargestellt.Further advantageous embodiments of the invention are presented in the subclaims.
Alle Einrichtungen, wie die Wasserhochdruckanlage, die Sensorik sowie die Steuer- und Auswerteelektronik werden auf einein speziellen Schienenfahrzeug installiert.All facilities, such as the high pressure water system, the sensors and the control and evaluation electronics are installed on a special rail vehicle.
Dieses Fahrzeug fährt die kritischen Streckenbereiche ab, kontrolliert dabei permanent die Schienenoberflächen und detektiert die Schmierfilmstellen. Im Endzustand des Systems wird bei Detektion von Schmierfilm dieser während der Fahrt sofort durch die Reinigungsausstattung entfernt und durch eine weitere Detektion bei derselben Fahrt die Reinigungsqualität festgestellt.This vehicle travels the critical route areas, constantly checking the rail surfaces and detecting the lubricating film points. In the final state of the system, when the lubricating film is detected, it is immediately removed by the cleaning equipment during the journey and the cleaning quality is determined by a further detection during the same journey.
Durch die Erfindung wird somit erreicht, daß Sensoren unter Einsatz der Lasertechnik in der Lage sind, Schienenbereiche mit kritischer Verschmutzung zu erkennen.It is thus achieved by the invention that sensors using laser technology are able to detect rail areas with critical contamination.
Dem Konzept des Sensors (Laser-Assisted-Rail-Sensor-LARS) liegt die Überlegung zugrunde, daß das Reflexionsverhalten der Schienenoberfläche stark von der Oberflächenbeschaffenheit abhängt. Die Reflexion des Laserstrahls wird daher auf charakteristische Weise beeinflußt.The concept of the sensor (Laser-Assisted-Rail-Sensor-LARS) is based on the consideration that the reflection behavior of the rail surface strongly depends on the surface condition. The reflection of the laser beam is therefore influenced in a characteristic manner.
Eine Strahlaufweitung auf einen Durchmesser von ca. 10 mm unterdrückt dabei den Einfluß lokaler Unebenheiten der Schiene.
Ein Ausführungsbeispiel der Erfindung ist in Form einer prinzipiellen Anordnung in der Zeichnung dargestellt.A beam expansion to a diameter of approx. 10 mm suppresses the influence of local unevenness in the rail.
An embodiment of the invention is shown in the form of a basic arrangement in the drawing.
Diese Anordnung ist in einem Meßkopf 1 am Schienenfahrzeug zusammengefaßt, der mit dem Schienenfahrzeug in geeigneter Weise so verbunden ist, daß die Schiene 2 z. B. über ein Fenster 3 und Gummischürze 4 mittels des parallelen Laserstrahls 5 abgetastet werden kann, der von einem Laser 6 ausgehend über eine Faseroptik 7 und amorphotische Kollimatoroptik 8 einer Aufweitungsoptik 9 zugeleitet und aufgeweitet wird.This arrangement is summarized in a measuring head 1 on the rail vehicle, which is connected to the rail vehicle in a suitable manner so that the rail 2 z. B. can be scanned via a
Der aufgeweitete parallele Laserstrahl 5 (z. B. eines HeNe-Lasers oder Diodenlasers) trifft unter einem bestimmten Winkel auf die Schiene 2. Das reflektierte Laserlicht wird über zwei Linsen 10, 11 auf zwei Detektoren 12, 13 abgebildet (spiegelnd reflektierter Strahl = spiegende Reflexion, diffus reflektierter Strahl = diffuse Reflexion).The expanded parallel laser beam 5 (e.g. a HeNe laser or diode laser) hits the
Die Signale der beiden Detektoren 12, 13 werden über Vorverstärker 14, 15 einer Auswerteeinheit 16 z. B. einem Auswerterechner im Leitstand des Schienenfahrzeuges zugeführt.The signals of the two
Folgende Fälle können bei der Auswertung der Signale der beiden Detektoren 12, 13 auftreten:
- Fall A: trockene, saubere Schiene
- Fall B: trockene, leicht verschmutzte Schiene
- Fall C: nasse, weitgehend saubere Schiene
- Fall D: trockene Schiene mit Schmierfilmsubstanzen
- Fall E: feuchte bis nasse Schiene mit Schmierfilmsubstanzen
- Case A: dry, clean splint
- Case B: dry, slightly dirty splint
- Case C: wet, largely clean rail
- Case D: dry rail with lubricating film substances
- Case E: moist to wet rail with lubricating film substances
Der Sensor ist in der Lage, die Fälle A, B und C (kein Schmierfilm) von den Fällen D und E (Schmierfilm vorhanden) zu unterscheiden.The sensor is able to distinguish cases A, B and C (no lubricating film) from cases D and E (lubricating film available).
Dies erfolgt dadurch, daß die reflektierte Strahlung mit Hilfe von zwei Detektoren registriert wird, wobei die Detektoren so angeordnet sind, daß ein Detektor die Laserstrahlung in spiegelnder Reflexion und ein zweiter Detektor die Laserstrahlung in diffuser Reflexion empfängt.This is done in that the reflected radiation is registered with the aid of two detectors, the detectors being arranged such that one Detector receives the laser radiation in specular reflection and a second detector receives the laser radiation in diffuse reflection.
Folgende Signale lassen sich auswerten:
- Signal des ersten Detektors (S1), spiegelnde Reflexion
- Signal des zweiten Detektor (S2), diffuse Reflexion
- Summensignal (S1 + S2)
- Signalverhältnis (S1/S2 bzw. S2/S1).
- Signal from the first detector (S1), specular reflection
- Signal of the second detector (S2), diffuse reflection
- Sum signal (S1 + S2)
- Signal ratio (S1 / S2 or S2 / S1).
Versuche haben gezeigt, daß Schmierfilm immer dann vorliegt, wenn die spiegelnde Reflexion im Verhältnis zur diffusen Reflexion stark abnimmt. Dies erklärt sich aus der Zunahme von Streuzentren auf der Schiene, welche das Streulicht begünstigen.Experiments have shown that lubricating film is always present when the specular reflection decreases sharply in relation to the diffuse reflection. This is explained by the increase in scattering centers on the rails, which favor the scattered light.
Folgender systematischer Zusammenhang ergibt sich:
Wie die Tabelle zeigt, sind ausreichend Kriterien vorhanden, um die relevanten Schienenzustände zu unterscheiden.As the table shows, there are sufficient criteria to distinguish the relevant rail conditions.
Zur Unterdrückung von Falschlicht an den Detektoren 12, 13 ist es von Vorteil, mit geeigneten Filtern oder einem amplitudenmodulierten Laserstrahl zu arbeiten.To suppress false light at the
Der Schaltschrank mit z. B. 19'' - Einschubrahmen 17 für die Anordnung mit Netzteil 18, Mikrokontroller 19, Verstärkungselektronik 20, PC-Interface 21 und Stromversorgung 22 für den Laser 6 ist an geeigneter Stelle im Schienenfahrzeug angeordnet.The control cabinet with z. B. 19 '' slide-in
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19542872 | 1995-11-17 | ||
| DE1995142872 DE19542872C1 (en) | 1995-11-17 | 1995-11-17 | Process for the detection of lubricating film on rails |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0774395A2 true EP0774395A2 (en) | 1997-05-21 |
| EP0774395A3 EP0774395A3 (en) | 1998-08-05 |
Family
ID=7777705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96113791A Withdrawn EP0774395A3 (en) | 1995-11-17 | 1996-08-29 | Method and device for detecting a lubricating film on rails |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0774395A3 (en) |
| DE (1) | DE19542872C1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106274980A (en) * | 2016-09-28 | 2017-01-04 | 成都奥克特科技有限公司 | Track condition on-line monitoring method based on laser monitoring |
| CN114460051A (en) * | 2022-01-11 | 2022-05-10 | 西南交通大学 | Fluorescence detection device and method for detecting the coating effect of rail top friction modifier |
| GB2593825B (en) * | 2020-04-02 | 2024-03-06 | Plasmatrack Ltd | Surface condition monitoring of railway tracks |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2389352B (en) * | 1999-11-01 | 2004-01-21 | Laserthor Ltd | Rail cleaning method and apparatus |
| DE102011113069B4 (en) | 2011-09-09 | 2022-07-07 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Control device for a rail vehicle and method for determining an adhesion value for a rail vehicle |
| DE102018209920B3 (en) | 2018-06-19 | 2019-07-11 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | A method of predicting an adhesion value in a contact point between a wheel of a rail vehicle and the rail, a method of improving the adhesion value in a contact point between a wheel of a rail vehicle and the rail and apparatus for performing the method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2229269A (en) * | 1989-02-16 | 1990-09-19 | Atomic Energy Authority Uk | Surface moisture detection |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4312876B4 (en) * | 1993-04-20 | 2004-04-08 | IBEG Maschinen- und Gerätebau GmbH | Device for measuring and determining the change on the tread of a wheel of rail vehicles |
-
1995
- 1995-11-17 DE DE1995142872 patent/DE19542872C1/en not_active Expired - Fee Related
-
1996
- 1996-08-29 EP EP96113791A patent/EP0774395A3/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2229269A (en) * | 1989-02-16 | 1990-09-19 | Atomic Energy Authority Uk | Surface moisture detection |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106274980A (en) * | 2016-09-28 | 2017-01-04 | 成都奥克特科技有限公司 | Track condition on-line monitoring method based on laser monitoring |
| GB2593825B (en) * | 2020-04-02 | 2024-03-06 | Plasmatrack Ltd | Surface condition monitoring of railway tracks |
| CN114460051A (en) * | 2022-01-11 | 2022-05-10 | 西南交通大学 | Fluorescence detection device and method for detecting the coating effect of rail top friction modifier |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19542872C1 (en) | 1997-01-30 |
| EP0774395A3 (en) | 1998-08-05 |
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