| 摘要 |
PURPOSE:To measure a level with small errors, by measuring the height of light receiving at a specified position by a light receiving device, and measuring the distance between the position of a light source or a light receiving device and the measuring position. CONSTITUTION:Light from a laser light source 1, which is made to scan in a horizontal plane by a motor 5, is received by a light receiving device 2, which is separated from the light source 1 by a specified distance, and a plurality of light receiving elements of a light receiving device 3, which is provided in a working vehicle. The outputs of the elements 6 are inputted into an encoder 9 through detectors 7 and FFs 8. The height of the light receiving of the laser light is outputted to an operating part 10. Meanwhile, received light signals from the detectors 7 are inputted to a distance measuring part 12 through an OR gate 11. The distance to the light source 1 is measured from the time difference to the light receiving time and outputted to the operating part 10. The operating part 10 corrects the height of the light receiving based on the height of the light receiving from the encoder 9, the light receiving distance from the distance measuring part 12, and the slant angle of the laser light from the horizontal plane, and controls the working vehicle so that the result becomes equal to the height of the light source. Thus the level measurement having small errors can be performed. |
