| 摘要 |
PURPOSE:To miniaturize the device and to obtain a measured value of high accuracy by forming measuring points of 3-5 stages as one group and performing successively a simultaneous measurement of one group of measuring points so that a partial point of two points or more among them becomes a measuring point of the same part. CONSTITUTION:Length of a sensor frame 3 is about 125cm, and in its vertical axis direction, for instance, in three stages and in the same horizontal plane, four pieces of ultrasonic sensors 4a-4c are provided on four sides, respectively. First of all, three positions in the axial direction and four positions in the axial direction of a channel box A are measured simultaneously as one group, and by moving relatively the box A and the frame 3, the measurement is executed in the next position, and by repeating it several times, the measurement is executed extending over the overall length of the box A. In this case, among the three measuring points of the first time side, two points of the upper side and two points of the lower side in the second time measurement are measured by overlapping the same position. Unless measured data of the overlap points coincide, a coordinate conversion is executed with regard to the overlap measuring point of the second time, and it is allowed to coincide with the measuring position of the previous time. In such a way, exactitude being the same as a multipoint simultaneous measurement can be obtained. |
