Fiber-Bragg-grating sensor system developed at PolyU now under test on China's high-speed rail

Hong Kong--Fiber-bragg-grating (FBG) sensor systems developed at Hong Kong Polytechnic University (PolyU) have been installed along several lengths of China's high-speed rail system to monitor structural health of the rails. PolyU is collaborating with Southwest Jiaotong University (Chengdu, China) and Dalian Jiaotung University (Dalian, China) to characterize the performance of the FBG systems.

The PolyU FBG sensors are periodic structures created inside the 10 µm core diameter of standard 125 µm optical fibers. The hundreds of installed optical sensors provide information on vibration, acceleration, and temperature change for engineering staff, helping them to monitor the condition of tracks and railcars as well as the structural health of the rail foundation. They also keep track of train speed, axle balance, and vibration data for record and further analysis. PolyU’s optical sensors have also been installed on the new generation of high-speed trains for monitoring wind pressure.

PolyU hosted the First International Workshop on High-Speed and Intercity Railways from 20 to 22 July in Shenzhen and Hong Kong. The workshop was co-organized with Southwest Jiaotung University, Beijing Jiaotung University, Dalian Jiaotung University, China Engineering Consultants, Inc. (Taiwan), Zhejiang University and Tsinghua University.

A research team in PolyU's department of mechanical engineering has developed an ultrasonic diagnosis system that detects cracks arising from metallic fatigue and corrosion of key parts in the track and rail. The technology can be combined with the use of laser actuating/sensing technology for monitoring the structural health of bridges, tunnels, tracks, train bodies, bogie frames, and wheel axles.


Posted by John Wallace

Follow us on Twitter

Subscribe now to Laser Focus World magazine; it’s free!

Follow OptoIQ on your iPhone. Download the free App here 


Most Popular Articles


Handheld Spectrometers

Spectroscopy can be a powerful measurement tool, and handheld spectrometers offer the ultimate in portability, so the instrument can be applied wherever meas...

Fracking, climate change, and lasers:  new tools to reduce fugitive methane emissions

This webcast, sponsored by Hamamatsu Corporation, covers recent developments and field deployments of compact quantum-cascade-laser (QCL)-based methane senso...

Opportunities in the Mid-IR

The technology for exploiting the mid-IR is developing rapidly:  it includes quantum-cascade lasers and other sources, spectroscopic instruments of many...

Fiber Optic Sensors – Fundamentals, Principles and Applications

In this webcast, sponsored by Nufern, we focus on optical fiber sensing technology.  Fundamental concepts will be presented first, followed by the under...
Technical Digests

HIGH-POWER FIBER LASERS: Working in the kilowatt regime

High-power materials-processing fiber lasers are available in an increasing variety of forms, as ...
Sponsored by

Click here to have your products listed in the Laser Focus World Buyers Guide.



Fiber optics Partial discharge sensors and system


OEM high power fiber laser module up to 1.5 kW

X-LASE 24-6

Picosecond pulsed fiber laser, Average power: 24W


QPS Photronics Inc

Provides Fabry-Perot FBG interference cavity and related components, Laser cavity FBG P...

Ancal Inc

Supplies miniature fiber optic spectrometers, spectroradiometers, fiber optic light sou...

Barcor Inc

Manufactures stock and custom fiber optic illumination systems including fiber optic li...
Social Activity
Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS