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.
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机译：多通道光纤激光多普勒振动仪振动计具有在3个不同地点的同时非接触式测量的能力。首先使用两组测量，首先使用在重力下落下的小球轴承（1mm-5.5mm），其次使用从极高的速度轻质气枪（LGG）射出的小射弹（1 mm），速度在1公里的范围内/ s-8 km / s。影响损坏的测定对于航空航天，军事和铁路等行业来说是重要的，其中影响对结构的影响可能导致主要的结构损伤。据我们所知，在此报道的研究表明，多通道纤维激光多普勒振动计用于检测超胶质局部影响的第一件试验。
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