| 摘要 |
PURPOSE:To enable the rapid measurement of distance corresponding to variations of parameters, by applying two laser beams alternately to an object point, and by measuring a distance on the basis of an angle of rotation determined from the coincidence of patterns of bit positions on a linear sensor. CONSTITUTION:A distance-measuring instrument is constructed of two laser beam projectors, a linear sensor B, a computer CT, etc. An object point C is irradiated by a first laser beam OP, and a distance Lh is determined thereby as a position signal value (r) of the linear sensor B, which is stored in a memory means. Next, switching is made over to a second laser beam rotating through a rotational angle (r) around a basic point O' with a zero position O'P0 set as a reference, and the object point C is irradiated thereby at a rotational vector O'P0-O'P'. An output of the linear sensor B thus obtained and a rotational angle output of a rotary encoder En are inputted to the computer CT to find a rotational angle epsilon, and the distance Lh is calculated therefrom. By this method, a distance can be measured rapidly corresponding to sharp variations of parameters. |
