Patent ID: 8310653

Claim:
A laser scanner measuring system, comprising a laser scanner and a calibration target, wherein said laser scanner comprises a light emitting element for emitting a pulsed laser beam, a rotary projecting unit for projecting said pulsed laser beam for scanning, a distance measuring unit, which has a distance measuring light receiving unit, for measuring a distance by receiving a reflection light from an object to be measured, and a control unit for driving and controlling said light emitting element and said distance measuring unit, wherein said calibration target has a reflection sector with a known shape and with high reflectance and a member with lower reflectance than said reflection sector in which said reflection sector is provided, and wherein said control unit judges a reflected pulsed laser beam from said reflection sector as received by said distance measuring light receiving unit and a reflected pulsed laser beam from other than said reflection sector by detecting a level of light quantity and calculates the shape of said reflection sector based on the result of the judgment and determines a center position of said reflection sector from the shape.