| 摘要 |
PURPOSE:To accurately and easily measure a supporting angle and an invasion angle by detecting a measured signal level outputted from a range finder while rotating and a rotation angle detection signal outputted from a rotation angle detector. CONSTITUTION:The moment a rotational mechanism is driven, ultrasonic waves (H) are generated from the ultrasonic range finder 14 and the reflected waves (R) at a chain 10 are received and a measured signal (Q) in accordance with a reception level is outputted. Next, the output signal (Q) is sent to a minimum distance detection part 18 and respective minimum values of the measured signal (Q) in the direction of the measuring visual field (a) of the range finder 14 and in its opposite direction are calculated. On the other hand, the rotation angle detector 16 detects a rotation angle of a rotating arm 13 and outputs a detected signal (K) of the rotation angle in accordance with the rotation angle and the signal is taken in a rotation angle taking-in part 21. Then, rotation angle information when the minimum distance is detected from the minimum distance detection part 18 is sent out to a depression angle arithmetic part 19 and a supporting angle arithmetic part 20. Next, the arithmetic part 19 calculates a depression angle alpha from distance information and the rotation angle information. On the other hand, the arithmetic part 20 receives the depression angle alpha from the arithmetic part 19 and calculates the supporting angle theta from the rotation angle.
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