| 摘要 |
PURPOSE:To survey displacement without almost receiving restriction due to a small caliber pipe, by providing a target having an extremely small size to a leading pipe. CONSTITUTION:A target 2 is arranged to a leading pipe 3 so that two bright points 1, 1 are positioned within a vertical plane right-angled to the center line of the leading pipe 3 and the image thereof is picked up by the TV camera 5 mounted to the transit 6 anchored on a propelling planning line or the straight line parallel thereto. That is, the image of the target can be picked up if said target 2 has an extremely small size of about 2cm square and only a space capable of being viewed by the rearward TV camera 5 is secured. When the image signal of the TV camera 5 is inputted to a moving matter position measuring apparatus 7, the center-of-gravity position of moving matter (bright points 1, 1) is measured at every one TV frame and the data thereof is outputted to a personal computer (operational processor) 8. At the same time, the image signals of two bright points 1, 1 are visibly displayed on the X, Y coordinates picture of monitor TV12. |
