| 摘要 |
PROBLEM TO BE SOLVED: To conveniently and accurately measure specified position in a tunnel even so bending hard to see through at a low cost, without managing a person to enter it. SOLUTION: A top end system 2 is composed of a reflection mirror. An intermediate system 4 comprises a laser measuring unit 12 for measuring the distance from the top end system 2 by irradiating a laser beam on the reflection mirror 2, television camera 11 for taking the image of a light reflected from the mirror 2, reflection mirror 13 for reflecting the laser beam from a shaft system 5, laser distance meter 12, two-axis gimbal 14 for supporting the television camera, etc., actuators 15, 16 for rotating the gimbal 14 to face the intermediate system 4 just at the top end system 2 based on the reflected light image from the reflective mirror 13, and angle detectors 17, 18 for detecting the angle of the laser distance meter when just facing. The shaft system 5 is constituted in the same constitution of the intermediate system 4 from which only the reflection mirror is removed, and a position measuring controller 6 measures the three-dimensional position of the top end of a tunnel 1, based on a distance signal from the laser distance meter and angle signal from the angle detector. |
