Patent ID: 8675209

Claim:
An optical displacement meter, which detects a peak position of reflected light from an object, to detect a displacement of the object by a triangulation system, the meter comprising: a light-projecting part which irradiates the object with light; a light-receiving part which receives first light containing a first linear polarization component and second light containing a second linear polarization component that is different from the first linear polarization component, in a mutually discriminable manner; a light-receiving amount distribution acquiring part which acquires a light-receiving amount distribution of the first light obtained by the light-receiving part as a first light-receiving amount distribution, and a light-receiving amount distribution of the second light obtained by the light-receiving part as a second light-receiving amount distribution; a peak position detecting part which calculates, based on the first and second light-receiving amount distributions acquired by the light-receiving amount distribution acquiring part, discrimination information for discriminating between a position of a false peak due to light reflected on a surface of the object more than once and a position of a true peak due to light reflected thereon once, to specify the true peak position based on the calculated discrimination information; and wherein the displacement of the object corresponds to the true peak position specified by the peak position detecting part.