McGinn & Gibb, PLLC
Vibration measurement method and apparatus
 The present invention provides a vibration measurement method and apparatus utilizing a self-mixing type laser Doppler vibrator meter. The vibration measurement method includes steps of: oscillating a laser beam of a predetermined wavelength and applying the laser beam to an object to be measured; mixing the reflected laser beam from the object and the oscillated laser beam for outputting a beat wave; calculating ratio of a beat wave amplitude for the turning point of the vibrating object, with respect to a predetermined reference amplitude; and calculating a displacement amount for the turning point of the vibrating object, according to the calculated ratio. This enables to detect the vibration of the object to be measured, with a high accuracy. 
Suzuki Motor Corporation
H H H H H G H H G H H H H H G H H
H01L H01L H01L H01L H01L G01H H01L H01L G01P H01L H01L H01L H01L H01L G01P H01L H01L
additional additional additional additional additional inventional additional additional inventional additional additional additional additional additional inventional inventional additional
Akiyoshi Tetsuro
Ohno Maruyama