Patent ID: 7489410

Claim:
An optical displacement meter for measuring a displacement of an object to be measured, comprising: a projector for irradiating an object to be measured with strip-line-shaped light having expansion in a first direction or performing a scan in the first direction and emitting light; a two-dimensional light receiving device having a plurality of pixel construction parts for receiving reflection light image of the strip-line-shaped light from the object to be measured, the plurality of pixel construction parts are arranged in a plane in a second direction corresponding to the first direction and in a third direction in which the reflection light image is changed corresponding to displacement of the object, and for outputting a reception light signal corresponding to amount of the reflection light image; an amplifier for amplifying the reception light signal from the two-dimensional light receiving device; a profile computing unit for calculating a position of the light reflection light image along the third direction at each position in the second direction on the two-dimensional light receiving device based on the amplified reception light signal, and for computing displacements of the object at each position in the second direction as the a profile shape of the object to be measured on the basis of the position of the light reflection light image along the third direction on the two-dimensional light receiving device; a display unit capable of displaying the profile shape of the object to be measured computed by the profile computing means; registered-profile designating means for designating at least part of the profile shape displayed on the display unit as a registered profile; profile matching means for computing matching amount between the profile shape of the object to be measured computed by the profile computed means and the registered profile designated by the registered-profile designating means under a plurality of inspection conditions, and for computing an inspection condition where the matching amount is high; and outputting means for rotating or shifting the inspected profile shape based on the inspection condition where the matching amount is high computed by the profile matching means, and for outputting the rotated or shifted inspected profile shape.