mechanooptical vibrometer

mechanooptical vibrometer

[¦mek·ə·nō′äp·tə·kəl vī′bräm·əd·ər]
(engineering)
A vibrometer in which the motion given to a probe by a surface whose vibration amplitude is to be measured is used to rock a mirror; a light beam reflected from the mirror and focused onto a scale provides an indication of the vibration amplitude.