OBCMS

On-Board Condition Monitoring System


Background
Safety and efficiency can be improved if Rolling Stock is monitored real time. Capturing and analyzing data, when rolling stock is loaded and running with maximum speed, would help to know the health of rolling stock better than when stationary or not loaded. This way monitoring would also reduce expenses for maintenance and also improve operating ratio.


Introduction

OBCMS is being designed and developed to provide below information of rolling stock in real time:

  • Lateral and vertical accelerations at axle box level
  • Acoustics of bearings
  • Temperature of bearings
  • Condition of brake rigging
  • Quality of air inside the coach
  • Noise level inside the Coach
  • Water level in water tanks in coach toilets
  • Fire and smoke inside the coach

OBCMS can also monitor condition of track health through sensing of abnormal jerks, real time, at specific location.

FBG Concept

The FBG operates like an optical filter i.e. it reflects certain wavelength of light while it transmits others. Fiber Bragg Gratings convert mechanical strain variation into an optical wavelength shift.
Strain caused on the FBG sensor would make wavelength to get shifted to detect/sense parameters.



FBG fabrication

FBG is fabricated by exposing photosensitive fiber core to pulsed UV laser through optical phase mask.

FBG Sensors can be employed for sensing below parameters

  • Strain
  • Temperature
  • Force
  • Displacement
  • Vibration
  • Load
  • Flow
  • Rotation/Torque
  • Electric Fields
  • Magnetic Fields
  • Pressure
  • Displacement/Velocity
  • Acceleration
  • Chemical concentration
  • Gas Sensing like Hydrogen
  • Displacement/Velocity
  • Biomedical Applications
  • Specific biosensor

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