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EP2368782A1 - Verfahren und Vorrichtung zur Echtzeit-Detektion des Belegungsstatus von Bahnstreckenabschnitten auf Grundlage von FBG-Sensoren - Google Patents

Verfahren und Vorrichtung zur Echtzeit-Detektion des Belegungsstatus von Bahnstreckenabschnitten auf Grundlage von FBG-Sensoren Download PDF

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Publication number
EP2368782A1
EP2368782A1 EP10425078A EP10425078A EP2368782A1 EP 2368782 A1 EP2368782 A1 EP 2368782A1 EP 10425078 A EP10425078 A EP 10425078A EP 10425078 A EP10425078 A EP 10425078A EP 2368782 A1 EP2368782 A1 EP 2368782A1
Authority
EP
European Patent Office
Prior art keywords
fbg
sensor
hole
elastic holder
web
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.)
Withdrawn
Application number
EP10425078A
Other languages
English (en)
French (fr)
Inventor
Pasquale Antuofermo
Giuseppe Saracino
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.)
MER MEC SpA
Original Assignee
MER MEC SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MER MEC SpA filed Critical MER MEC SpA
Priority to EP10425078A priority Critical patent/EP2368782A1/de
Priority to PCT/EP2011/054124 priority patent/WO2011113931A1/en
Publication of EP2368782A1 publication Critical patent/EP2368782A1/de
Withdrawn legal-status Critical Current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
    • B61L1/16—Devices for counting axles; Devices for counting vehicles
    • B61L1/163—Detection devices
    • B61L1/166—Optical

Definitions

  • the present invention refers to the technical field of the methods and devices for the control of railway lines status and in particular to the technical field of the methods and devices for the detection of the state of occupation of railroad sections.
  • the present invention relates generally to railway safety, and more particularly to a system detecting in real time the state of occupation of railroad sections.
  • the employed detector is based on Fiber Bragg Gratings (FBG) sensors, which are implemented into a fiber optics, and placed strictly in contact with the rail.
  • FBG sensors manage to reflect a particular optical wavelength related to the stress grade induced by the wheel weight on the rail.
  • It's an aim of the present invention to disclose a method and a device for the real time detection of the state of occupation of railroad sections based on FBG sensors wherein the correct placement of said FBG sensors is continuously monitored.
  • Method and device for the real time detection of the state of occupation of railroad sections based on FBG sensors, further adapted to continuously check and monitor its own correct placement on the rail track and its own state of functionality.
  • the present invention discloses a method and a device for the real time detection of the state of occupation of railroad sections based on FBG sensors wherein the correct placement of said FBG sensors is continuously monitored in order to make sure that said FBG sensors is strictly in contact with the railway track to be monitored.
  • the present invention is based on the technique of detecting the deformation of the rail, caused by the wheel transit, by detecting the deformation of a hole made on the web of the rail itself.
  • the device according to the present invention comprises an elastic holder 4, preferably shaped as a closed ring or as an open ring, and an FBG sensor 3 fixedly attached to said elastic holder 4.
  • the FBG sensor 3 is furthermore associated to an electronic measurement device 5 by means of a fiber optic link 6.
  • the measurement device 5 is adapted to interrogate the FBG sensors to evaluate their strain state.
  • the measurement device 5 is adapted to send light signals to the fiber optic 6, said light signals having a frequency spectrum tuned with the frequency spectrum of the FBG sensors to interrogate.
  • each FBG sensor interrogated reflects back, toward the measurement device 5, a certain optical wavelength. Measuring the reflected wavelength value, the measurement device 5 establishes the strain condition and correct placement of the FBG sensor and the presence of the vehicle wheel on the monitored rail track.
  • Said elastic holder 4 can be made of metal, fiberglass, composite or plastic material.
  • the optical wavelength reflected by the FBG sensor and acquired by said electronic measurement device 5 is directly related to its length variation, and thus it is related to the mechanical stress induced on the support.
  • the holder 4 When the holder 4 is not fixed to the rail, said holder is in its relaxed state and its radius is R2 as indicated in enclosed figure 2 .
  • the light reflected by the FBG sensor 3 In the relaxed state the light reflected by the FBG sensor 3 is characterized by a well defined optical wavelength L2.
  • L2 When the holder 4 is compressed in radial direction, the curvature of its surface changes. The change of the surface of the holder 4 forces the FGB sensor length to change and, consequently, the optical wavelength reflected by said FGB sensor changes as well.
  • the holder 4 In order to detect the deformation of the rail track during the transit of a wheel, the holder 4 is inserted in a hole 1 arranged in the rail web, in order to detect its deformation.
  • the hole is arranged having a radius R1 slightly smaller than the nominal, relaxed state radius R2 of said holder 4.
  • the device according to the present invention is characterized by two bi-stable states, L1 and L2, and a third measurement state L3.
  • both the hole 1 and the holder 4 are further deformed, resulting in a variation of the FBG sensor wavelength from L1 to L3.
  • the two bi-stable wavelength values are continuously checked by said electronic device 5 to assess if the holder 4 is properly inserted in the hole 1 and then able to detect the wheel transits.
  • an alarm signal is sent to the signaling network that ensure that no trains have access to the checked railway section.
  • the electronic device 5 can be easily and directly connected to a common railway signaling plant, replacing the present electromagnetic devices and thus allowing for easy retrofitting of the existing signaling systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP10425078A 2010-03-19 2010-03-19 Verfahren und Vorrichtung zur Echtzeit-Detektion des Belegungsstatus von Bahnstreckenabschnitten auf Grundlage von FBG-Sensoren Withdrawn EP2368782A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10425078A EP2368782A1 (de) 2010-03-19 2010-03-19 Verfahren und Vorrichtung zur Echtzeit-Detektion des Belegungsstatus von Bahnstreckenabschnitten auf Grundlage von FBG-Sensoren
PCT/EP2011/054124 WO2011113931A1 (en) 2010-03-19 2011-03-18 Method and device for the real time detection of the state of occupation of railroad sections based on fbg sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10425078A EP2368782A1 (de) 2010-03-19 2010-03-19 Verfahren und Vorrichtung zur Echtzeit-Detektion des Belegungsstatus von Bahnstreckenabschnitten auf Grundlage von FBG-Sensoren

Publications (1)

Publication Number Publication Date
EP2368782A1 true EP2368782A1 (de) 2011-09-28

Family

ID=42541535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10425078A Withdrawn EP2368782A1 (de) 2010-03-19 2010-03-19 Verfahren und Vorrichtung zur Echtzeit-Detektion des Belegungsstatus von Bahnstreckenabschnitten auf Grundlage von FBG-Sensoren

Country Status (2)

Country Link
EP (1) EP2368782A1 (de)
WO (1) WO2011113931A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013114129A1 (en) * 2012-02-01 2013-08-08 Optasense Holdings Limited Detecting train separation
CN109131436A (zh) * 2017-06-15 2019-01-04 比亚迪股份有限公司 轨道占用状态的检测方法、装置和轨道交通系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109398420A (zh) * 2018-09-27 2019-03-01 中铁二院工程集团有限责任公司 悬挂式单轨列车位置识别方法和识别传感器安装结构
CN113460118B (zh) * 2021-06-30 2022-09-13 北京全路通信信号研究设计院集团有限公司 一种轨道交通计轴系统及其解调方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1582430A1 (de) * 2004-03-29 2005-10-05 The Hong Kong Polytechnic University System und Verfahren zur Überwachung von Eisenbahnstrecken
WO2006112959A2 (en) * 2005-03-07 2006-10-26 Fibera, Inc. Hazard mitigation for railway track intrusions at train station platforms
EP1902923A2 (de) * 2006-09-20 2008-03-26 Ansaldo Segnalamento Ferroviario S.p.A. System zur Echtzeitüberwachung der Belegung von Eisenbahnstrecken
EP2112047A2 (de) * 2008-04-21 2009-10-28 ACE snc Verfahren und Anlage zur Messung und erweiterten Überwachung des Spannungszustands einer Langschiene

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1582430A1 (de) * 2004-03-29 2005-10-05 The Hong Kong Polytechnic University System und Verfahren zur Überwachung von Eisenbahnstrecken
WO2006112959A2 (en) * 2005-03-07 2006-10-26 Fibera, Inc. Hazard mitigation for railway track intrusions at train station platforms
EP1902923A2 (de) * 2006-09-20 2008-03-26 Ansaldo Segnalamento Ferroviario S.p.A. System zur Echtzeitüberwachung der Belegung von Eisenbahnstrecken
EP2112047A2 (de) * 2008-04-21 2009-10-28 ACE snc Verfahren und Anlage zur Messung und erweiterten Überwachung des Spannungszustands einer Langschiene

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013114129A1 (en) * 2012-02-01 2013-08-08 Optasense Holdings Limited Detecting train separation
CN104203713A (zh) * 2012-02-01 2014-12-10 光学感应器控股有限公司 检测列车分离
CN104203713B (zh) * 2012-02-01 2016-12-28 光学感应器控股有限公司 检测列车分离
CN109131436A (zh) * 2017-06-15 2019-01-04 比亚迪股份有限公司 轨道占用状态的检测方法、装置和轨道交通系统

Also Published As

Publication number Publication date
WO2011113931A1 (en) 2011-09-22

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