MEASUREMENT DEVICE AND MEASUREMENT METHOD

摘要

This measurement device is provided with an illuminating means (120) for illuminating a subject of measurement (200) with laser light, a light-receiving means (130) for receiving laser light scattered by said subject of measurement, a constraining means (150) for constraining the amplitude of an output signal from the light-receiving means to within prescribed bounds, and an outputting means (170) for outputting information regarding motion of the subject of measurement on the basis of a beat signal due to a laser-light Doppler shift in the output signal from the light-receiving means. Said measurement device minimizes the impact of mode hopping, allowing measurement to be performed in a suitable manner.