EP1453714B1 - Procede et systeme de detection d'objets le long d'un rail - Google Patents

Procede et systeme de detection d'objets le long d'un rail Download PDF

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Publication number
EP1453714B1
EP1453714B1 EP02774656A EP02774656A EP1453714B1 EP 1453714 B1 EP1453714 B1 EP 1453714B1 EP 02774656 A EP02774656 A EP 02774656A EP 02774656 A EP02774656 A EP 02774656A EP 1453714 B1 EP1453714 B1 EP 1453714B1
Authority
EP
European Patent Office
Prior art keywords
detectors
track
response signals
signals
response
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.)
Expired - Lifetime
Application number
EP02774656A
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German (de)
English (en)
Other versions
EP1453714A1 (fr
Inventor
Hanspeter Zehnder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Schweiz AG
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Siemens Schweiz AG
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Filing date
Publication date
Application filed by Siemens Schweiz AG filed Critical Siemens Schweiz AG
Priority to EP02774656A priority Critical patent/EP1453714B1/fr
Publication of EP1453714A1 publication Critical patent/EP1453714A1/fr
Application granted granted Critical
Publication of EP1453714B1 publication Critical patent/EP1453714B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/02—Electric devices associated with track, e.g. rail contacts
    • B61L1/08—Electric devices associated with track, e.g. rail contacts magnetically actuated; electrostatically actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L29/00—Safety means for rail/road crossing traffic

Definitions

  • the present invention relates to a method for the detection of objects along a track according to the preamble of patent claim 1.
  • Vehicle Presence System discloses a system in which passive magnetic detectors are arranged along a railway track in the track bed in order to determine the track occupancy in the vicinity of a railroad crossing. The detection takes place via a comparison of signals which are stored in advance in the absence of objects and signals which are acquired at a time determined by the detection and with the stored signals. Although this "Vehicle Presence System” is very practical, but associated with a high circuit complexity and is greatly limited in terms of the number of usable induction coils.
  • the present invention is therefore based on the object of specifying a method for the detection of objects along a track, which can be realized with a low circuit complexity, is independent of direct and indirect weather influences and allows monitoring of a route including the immediate environment with scalable resolution.
  • FIG. 1a shows a section of the route in the overview.
  • metal detectors D 1 , D 2 , .. in freely selectable spaces, .., d 34 , d 45 , .. are arranged (not fully shown in Fig. 1a and ) enumerated.
  • These spaces result from the operational requirements of a railway administration; typical sizes for these spaces are 5 m .. 200 m, for the distance a to the track axis 3 to 6 m.
  • detectors D 1 , D 2 , .. are connected to a transmitting / receiving unit 5, wherein a detector D n is geometrically the last detector.
  • the index n stands for the maximum number of detectors, with typical values for n being in the order of 10... 100.
  • FIG. 2 shows the structure of a detector D 1 operating according to the method NMR (Nuclear Magnetic Resonance), which has a permanent magnet 10, a gradient coil 11 and a transmitting / receiving coil 14 contains.
  • the permanent magnet 10 is horseshoe-shaped, in the air gap, a water sample 12 is arranged, which is surrounded by both the gradient coil 11 and the transmitting / receiving coil 14. It is to be provided structurally that the B field generated in the transmitting / receiving coil 14 is orthogonal to the B field of the permanent magnet 10.
  • the water sample 12 consists of a glass body filled with distilled water, a typical internal volume (also called measuring volume) of the glass body is of the order of magnitude of 0.5 cm 3 .
  • the configuration of the measurement volume must be such that, on the one hand, the highest possible signal intensity is achieved - this as an advantage of a relatively large measurement volume - and, on the other hand, a large homogeneity of the permanent magnetic field must be ensured via the corresponding measurement volume.
  • the H nuclei of the water molecules H 2 O are particularly suitable for the NMR method.
  • the so-called Larmor frequency of the H-core is 42MHz / Tesla.
  • the signal intensity of the response signal S R is significantly determined by the homogeneity of the magnetic field in the air gap. Relatively large metallic objects in the immediate vicinity of the permanent magnet affect the homogeneity of the magnetic field in the air gap, which leads to a line broadening and thus almost or entirely to an extinction of the NMR signal.
  • the structure and mode of action of such a detector D 1 is referred to by the skilled person as a so-called NMR detector.
  • the individual detectors D 1 , D 2 , etc. are individually characterized by their own number of turns N 1 , N 2 , .. the gradient coil 11.
  • the gradient coils 11 of the individual detectors D 1 , D 2 , etc. are connected in parallel with each other and connected to a gradient amplifier (not shown in FIG. 1 a).
  • the gradient amplifier can be part of the transmitting / receiving unit 5.
  • the individual transmitting / receiving coils 14 are preferably connected in parallel to the transmitting / receiving unit 5; It is also a serial connection possible.
  • FIG. 3 below shows a pulse packet S P (also referred to as transmit pulse) which is emitted by the transmitting / receiving unit 5 to the detectors D 1 , D 2 , etc.
  • a rectangular signal S A is applied to the gradient coils 11 by the gradient amplifier.
  • the duration t A of this square wave signal S A is, depending on the acquisition time or observation time called t A , at about 2 s.
  • t A the acquisition time or observation time
  • a detector-specific frequency band for the response signal S R is also produced on an emitted pulse packet S P.
  • the pulse width t P must be chosen so that all hydrogen atoms in the different detectors D 1 , D 2 , etc. can be excited simultaneously. This means that the bandwidth of the pulse S P must be significantly greater than the frequency deviation between the lowest and highest measurement frequency.
  • the response signal S R of a detector D to an emitted pulse packet S P is also shown in FIG. 3 in the time domain.
  • the typical observation time (acquisition time) is 1 s, the amplitude in the range of mV.
  • the response signal S R is mapped into the frequency domain by means of a Fourier transformation.
  • the result of this mapping of the response signals S R can be seen with a simplified curve S Rf of FIG. 1b.
  • various response signals P 1 , P 2 , etc. are shown. It is assumed that in the vicinity of the detector D3 is a metallic.
  • Object 6 is located so that the magnetic field in the water sample so affected that on a transmitted pulse packet in the frequency space no or according to the scale no representable response signal P3 arises.
  • the information can be derived that the route along the track 1 is occupied and therefore no adjustment of a signal for a passage of a train may be made.
  • the inventive method provides that after installation of the aforementioned system along a TRACK IS 1 on emitted pulse packets S P into the frequency domain transformed the detectors D 1, D 2 attributable response signals P 1, P 2 in either the transmitting / receiving unit 5 or stored in an associated evaluation unit.
  • These stored response signals P 1 , P 2 , P 3 , etc. can be assigned a flat rate for all the same or individual tolerance bands.
  • the previously mentioned rectangular signal for acquisition and the pulse packet S P are emitted in a fixed time frame or as required.
  • the incoming response signals S R are transformed into the frequency domain and compared with the stored response signal P 1 , P 2 , P 3 , and so on.
  • An inequality or an inequality outside of an aforementioned tolerance band leads to the generation of a signal indicating an occupancy of the relevant track 1 or track section.
  • a signal indicating an occupancy of the relevant track 1 or track section By emitting in a fixed time frame of, for example, 5 s, it can be provided, in particular, to store a selection of the resulting response signals, for example every 10th or every 50th signal progression S RF .
  • This storage allows in particular to detect a slow change and either to generate a warning signal regarding the functionality of the system and / or by a statistical method to correct the stored response signals. It should be noted that outliers are not included in this so-called auto-calibration.
  • the above-described embodiment of the method according to the invention was primarily aimed at the detection of objects 6 outside the railway.
  • the proposed method can also be applied to the railway operation itself and the tracking of a train along a track section.
  • inventive system and method is not limited to the embodiment described above, possible further evaluation methods, in particular by means of a two-dimensional Fourier transform to eliminate runtime shifts can. This represents the more general case of the embodiment described above, in which the transit time influence is negligible.
  • the method explained above is not limited to the railway technology, but can also be used, for example, in a matrix arrangement of detectors at a distance of, for example, 0.5 m for the detection of metallic objects such as mines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Claims (8)

  1. Procédé de détection d'objets (6) le long d'une voie ferrée (1) par des détecteurs (D1, D2, ...) mis en position le long de la voie ferrée (1), des signaux des détecteurs (D1, D2, ...) étant mémorisés au préalable en absence d'objets et des signaux étant détectés par les détecteurs (D1, D2, ...) à un instant déterminé par la détection et étant comparés aux signaux mémorisés,
    caractérisé en ce que
    les détecteurs fonctionnent par le procédé de la résonance magnétique nucléaire (RMN) et par les stades de procédé
    A des signaux (SR) de réponse sont détectés sur un paquet (SP) d'impulsions émis sur des détecteurs (D1, D2, ...) ;
    B les signaux (SR) de réponse qui sont détectés sont transformés en un signal (SRF, P1, P2, ...) dans l'espace fréquentiel ;
    C les signaux (SRF, P1, P2, ...) transformés dans l'espace fréquentiel sont comparés à des signaux de réponse mémorisés au préalable, qui ont été mémorisés alors que l'on est sûr de l'absence d'un objet (6) par les stades A et B de procédé, une inégalité constatée étant évaluée comme la présence d'un objet (6).
  2. Procédé suivant la revendication 1,
    caractérisé en ce que
    les détecteurs (D1, D2, ...) sont mis en position le long de la voie ferrée (1) suivant une séquence (d34, d45, ...) pouvant être choisie librement.
  3. Procédé suivant la revendication 1 ou 2,
    caractérisé en ce que
    les détecteurs (D1, D2, ...) sont mis en position à côté de la voie ferrée (1).
  4. Procédé suivant l'une des revendications 1 à 3,
    caractérisé en ce que
    chaque détecteur (D1, D2, ...) a une bobine (11) de gradient entourant un aimant (10) permanent, une bobine (14) d'émission/réception ainsi qu'un échantillon (12) d'eau.
  5. Procédé suivant la revendication 4,
    caractérisé en ce que
    chaque détecteur (D1, D2, ...) est caractérisé par un nombre (N1, N2, ...) individuel de spires de la bobine (11) de gradient.
  6. Procédé suivant l'une des revendications 1 à 5,
    caractérisé en ce que
    au stade C du procédé les signaux (SRF, P1, P2, ...) de réponse transformés dans l'espace fréquentiel peuvent être associés aux détecteurs (D1, D2, ...).
  7. Procédé suivant l'une des revendications 1 à 6,
    caractérisé en ce que
    dans le stade A du procédé, des paquets (SP) d'impulsions sont émis dans une trame de temps fixe pour reconnaître une modification se produisant lentement.
  8. Procédé suivant la revendication 7,
    caractérisé en ce que
    au stade C du procédé un choix de signaux (SRF, P1, P2, ...) de réponse transformés dans l'espace fréquentiel est mémorisé sur les paquets (SP) d'impulsions émis dans la trame temporelle fixe.
EP02774656A 2001-12-14 2002-09-27 Procede et systeme de detection d'objets le long d'un rail Expired - Lifetime EP1453714B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02774656A EP1453714B1 (fr) 2001-12-14 2002-09-27 Procede et systeme de detection d'objets le long d'un rail

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01129777 2001-12-14
EP01129777A EP1319570A1 (fr) 2001-12-14 2001-12-14 Procédé et dispositif pour la détection d'objects le long d'un rail
PCT/EP2002/010838 WO2003051700A1 (fr) 2001-12-14 2002-09-27 Procede et systeme de detection d'objets le long d'un rail
EP02774656A EP1453714B1 (fr) 2001-12-14 2002-09-27 Procede et systeme de detection d'objets le long d'un rail

Publications (2)

Publication Number Publication Date
EP1453714A1 EP1453714A1 (fr) 2004-09-08
EP1453714B1 true EP1453714B1 (fr) 2006-11-22

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP01129777A Withdrawn EP1319570A1 (fr) 2001-12-14 2001-12-14 Procédé et dispositif pour la détection d'objects le long d'un rail
EP02774656A Expired - Lifetime EP1453714B1 (fr) 2001-12-14 2002-09-27 Procede et systeme de detection d'objets le long d'un rail

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP01129777A Withdrawn EP1319570A1 (fr) 2001-12-14 2001-12-14 Procédé et dispositif pour la détection d'objects le long d'un rail

Country Status (5)

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EP (2) EP1319570A1 (fr)
AT (1) ATE345964T1 (fr)
DE (1) DE50208808D1 (fr)
ES (1) ES2277621T3 (fr)
WO (1) WO2003051700A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102673610B (zh) * 2012-05-29 2015-06-24 北京佳讯飞鸿电气股份有限公司 铁路防灾异物侵限监控系统
CN104627205A (zh) * 2014-12-17 2015-05-20 西南交通大学 基于光纤光栅传感器闭环回路的铁路异物侵限监测系统
CN111079734B (zh) * 2019-12-12 2020-07-31 哈尔滨市科佳通用机电股份有限公司 铁路货车三角孔异物检测方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4968979A (en) * 1985-04-19 1990-11-06 Omron Tateisi Electronics Co. Vehicle detecting system
GB2286248B (en) * 1991-06-07 1995-11-22 British Tech Group Detection method and apparatus
US5868360A (en) * 1997-06-25 1999-02-09 Primetech Electronics Inc. Vehicle presence detection system

Also Published As

Publication number Publication date
DE50208808D1 (de) 2007-01-04
ES2277621T3 (es) 2007-07-16
EP1453714A1 (fr) 2004-09-08
ATE345964T1 (de) 2006-12-15
WO2003051700A1 (fr) 2003-06-26
EP1319570A1 (fr) 2003-06-18

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