McGinn & Gibb, PLLC
Vibration measurement method and apparatus
 The present invention discloses a vibration measurement method and apparatus using a self-mixing type laser Doppler vibration meter. The vibration measurement method according to the present invention comprises: an inclination value calculation step S3 for calculating an ascending inclination and a descending inclination for each beat wave; and a turning point identification step S4 for identifying the turning point of a vibrating object according to the inclination change along the time axis. 
Suzuki Motor Corporation
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Tetsuro Akiyoshi
Maruyama Ohno