| 摘要 |
PURPOSE:To accurately extract a pulse based upon projection light even when the pulse is smaller than a pulse signal due to disturbance by arranging another reflected image photodetection system additionally in a range finder device. CONSTITUTION:The camera B consisting of a lens 14' and a linear photosensor 15' is arranged nearby a camera A consisting of a lens 14 and a linear photosensor 15, and a light source is so arranged that beam light 12 which makes a rotary scan in an xy plane about the optical center of the lens 14' is projected on an object body 13. Consequently, a pulse group pattern almost in the same order with the camera B is generated from the picture plane of the camera A as shown in, for example, figures (a) and (b). For the purpose, what order the pulse based upon the projection light of the camera B is in is counted (3rd in the figure b) and the pulse of the camera A corresponding to the number is selected. Therefore, even if the pulse is a fine pulse signal, it is decided that the pulse is the pulse based upon the projection light and accurate triangulation is realized. |
