Patent ID: 7751065

Claim:
An optical displacement meter for measuring a displacement of an object to be measured, comprising: a projector being configured to emit a strip-line-shaped light to an object to be measured; a two-dimensional light receiving device having a plurality of linear sensors arranged in parallel, being capable of receiving reflection light image of the strip-line-shaped light from the object to be measured, wherein each of the linear sensors has a plurality of pixel construction parts arranged in line and each of the pixel construction parts generates a reception light signal corresponding to the reflection light image; an amplifier for amplifying the reception light signals read from the two-dimensional light receiving device; a profile computing unit being configured to calculate a peak position of the amplified light reflection light signals at each of the linear sensors of the two-dimensional light receiving device, and being configured to compute a displacement (Z) of the object to be measured on the basis of each of the peak positions and to compute a profile shape of the object to be measured on the basis of a position (X) of each of the linear sensors in the two-dimensional light receiving device and the displacement (Z) at each of the linear sensors; and a reception light level controller being configured to extract a peak level which is an amount of the amplified light reflection light signal at each of the peak positions, and controlling at least one of the peak levels except for the highest side and the lowest side of amount of the amplified light reflection light signal to keep within a predetermined range by adjusting at least one parameter of an emitting amount of the projector, an emitting duration of the projector, an exposure duration of the two-dimensional light receiving device and an amplification ratio of the amplifier.