| 摘要 |
PURPOSE:To calculate the center position of a light spot regardless of the oscillation of light, by picking up the light spot, which appeared on each target by the incidence of light, by an image sensor and simultaneously taking out image signals in synchronous relationship to apply amplification and A-D conversion thereto. CONSTITUTION:When the laser beam (b) emitted toward a scheduled excavating line direction is incident to targets 2, 3 during a time when an excavation machine 1 excavates a tunnel, light spots 9, 10 each having a certain expanse are generated on light receiving surfaces. There light sports 9, 10 are picked up by image sensors 23, 24 and charge is accumulated on a light receiving element with a certain expanse. These light sports 9, 10 are taken out a image signals (g) in a state taking synchronism by a synchronizer 25 and the taken-out image signals are amplified by amplifiers 26, 27 while synchronism is applied in the same timing and the amplified signals are converted by A/D converters 28, 29 to operate the central position of an image and the forecasting route of the excavation machine is accurately grasped regardless of the shaking of laser. |
