Multichannel fiber laser Doppler vibrometer studies of low momentum and hypervelocity impacts Articles uri icon

publication date

  • December 2017

start page

  • 39

end page

  • 45


  • 99

International Standard Serial Number (ISSN)

  • 0143-8166


  • A multichannel optical fiber laser Doppler vibrometer was demonstrated with the capability of making simultaneous non-contact measurements of impacts at 3 different locations. Two sets of measurements were performed, firstly using small ball bearings (1 mm-5.5 mm) falling under gravity and secondly using small projectiles (1 mm) fired from an extremely high velocity light gas gun (LGG) with speeds in the range 1 km/s-8 km/s. Determination of impact damage is important for industries such as aerospace, military and rail, where the effect of an impact on the structure can result in a major structural damage. To our knowledge the research reported here demonstrates the first trials of a multichannel fiber laser Doppler vibrometer being used to detect hypervelocity impacts.


  • impacts; vibration; laser doppler; heterodyne; light gas gun