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

50 YEARS OF GAS LASERS


Durable survivors evolve new forms

Webcasts

Laser Measurements Critical to Successful Additive Manufacturing Processes

Maximizing the stability of the variables going into any manufacturing process is what ensures ts consistency and high quality. Specifically, when a laser is...

Ray Optics Simulations with COMSOL Multiphysics

The Ray Optics Module can be used to simulate electromagnetic wave propagation when the wavelength is much smaller than the smallest geometric entity in the ...

Multichannel Spectroscopy: Technology and Applications

This webcast, sponsored by Hamamatsu, highlights some of the photonic technology used in spectroscopy, and the resulting applications.

Handheld Spectrometers

Spectroscopy is a powerful and versatile tool that traditionally often required a large and bulky instrument. The combination of compact optics and modern pa...
White Papers

All About Aspheric Lenses

The most notable benefit of aspheric lenses is their ability to correct for spherical aberration....

Wavelength stabilized multi-kW diode laser systems

Wavelength stabilization of high-power diode laser systems is an important means to increase the ...

Narrow-line fiber-coupled modules for DPAL pumping

A new series of fiber coupled diode laser modules optimized for DPAL pumping is presented, featur...
Technical Digests

ADHESIVES, SEALANTS, AND COATINGS: Solutions for optical technologies

A vast array of optical systems of various types and degrees of complexity require the use of adh...

WAVELENGTH-SWEPT LASERS: Dispersion-tuned fiber laser sweeps over a 140 nm range for OCT

By eliminating the use of mechanical tunable filters and instead tuning by intensity-modulation i...

Keeping pace with developments in photonic materials research

For demanding or custom spectroscopy solutions, care must be taken in selecting and integrating a...

HIGH-POWER FIBER LASERS: Working in the kilowatt regime

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

Click here to have your products listed in the Laser Focus World Buyers Guide.
Social Activity
  •  
  •  
  •  
  •  
  •  
Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS