Long-distance Laser Doppler Vibrometer LV-S01-LD is an equipment which is able to measure object vibration in very long distance. The core part of its optical head is a high-sensitivity infrared laser interferometer. Long-distance Laser Doppler Vibrometer is also equipped with a telescope used for laser positioning, and it has very excellent optical sensitivity. It is able to measure object vibration 100m away and applicable in dam deformation monitoring、subway monitoring、landslide monitoring、bridge monitoring、high-rise building etc. It is an ideal system to monitor building deformation and micro vibration automatically. It is not only able to measure small deformation of object, but also to measure the vibration conditions of object. It can provides object frequency under forced vibration, object intrinsic frequency and amplitude. Parameters such as Impact factor, power frequency spectrum are also provided with frequency spectrum analyzer.