METHOD FOR CORRECTING ERRORS OF MEASURED POLARIZED LIGHT DISTANCE OF LASER SCANNER USING LESLIE PRISM AND APPARATUS THEREFOR

摘要

To correct errors due to differences in the optical path length due to the difference of the light path length in a laser scanner capable of deflecting a measured light using a Leslie prism.SOLUTION: In order to solve the above problem, the correction method of measured values includes a laser scanner 1 including a light emitting section 11, a light receiving section 12, a distance measuring section 13, an optical axis deflection section 14 having at least one pair of prisms (RA, RB) that deflects the measured light distance and deflects the reflected light distance to deflect onto the light receiving optical axis, and an injection direction detecting section 15. The method includes (a) a step of measuring the measurement point by the distance measuring unit with the laser scanner 1 provided with the injection direction detecting section 15 (an exit direction detecting section) for detecting a deviation angle of the measured light distance and an injection direction from the rotation angle of the optical axis deflection section, (b) a step of detecting a rotation angle of the prism in the injection direction detecting part, and (c) a step of obtaining a true range finding value obtained by subtracting the optical path length difference during light emission and light reception occurring in response to the rotation angle of the prism based on the rotation angle of the prism from the range finding value of the distance measuring section and correcting the length with respect to the optical path length difference.SELECTED DRAWING: Figure 9