Patent ID: 7880894
Filing Date: 2011-02-01
Classification: G01B,G01H

Abstract:
1. A vibration detection device comprising: a light source emitting a laser beam; an interferometer including a first vibrating body and a second vibrating body both capable of reflecting the laser beam and being displaced by a sonic wave, the interferometer splitting the laser beam into beams traveling along first to third optical paths, and the interferometer causing interference between a first reflected beam reflected by the first vibrating body in the first optical path and a reference beam passing through the third optical path to form a first interference pattern, and causing interference between a second reflected beam reflected by the second vibrating body in the second optical path and the reference beam to form a second interference pattern; and a detection means quantizing the vibrations of the first and second vibrating bodies on the basis of the formed first and second interference patterns to detect the vibrations.