| 摘要 |
PURPOSE:To make it possible to measure relative positions of a moving object without the need for a leveling-up operation even if a reference point has moved. CONSTITUTION:In front of a base body 5 a rotating element 13 rotatable about a vertical axis and a rotating element 15 rotatable about a horizontal axis are provided. Grooves 17, 19 are provided on the rotating elements 13, 15 respectively and a sleeve 21 is provided at the intersection of the grooves so as to be slidably movable along the grooves. A hole 23 is provided in the sleeve and a wire 25 of a wire displacement gauge 11 is connected to a moving point 3 through the hole. An angle sensor 27 measures an apparent horizontal angle thetah and an angle sensor 29 measures an apparent angle of elevation thetav. A combined value of the angles thetah and thetag is corrected by means of a rolling angle thetar to compute a true horizontal angle thetaH. A combined value of the angle thetav and a pitching angle thetap is corrected by means of the angle thetar to compute a true angle of elevation thetaV. A distance L is measured by the gauge 11. By using the distance L, the horizontal angle thetaH, and the angle thetaV, a relative position of the moving point 3 with respect to a reference point 1 can be obtained. |
