Laser Surveying System

Abstract

A laser surveying system comprises a leveling unit (3) having a motor for leveling, a light source unit (14) for emitting a laser beam, a light projecting optical system installed on the leveling unit and for projecting the laser beam, a power supply unit for supplying electric power to each of component sites, a control unit (7) for driving and controlling each of the component sites, a storage unit (26), a tilt detecting means (11) installed on the leveling unit and used for detecting leveling conditions, a rotation number detecting means (13) for detecting number of rotations of the motor, a light source detecting means (16a and 16b) for detecting light emitting condition of the light source unit, a voltage detecting means (24) for detecting output voltage of the power source unit, and an abnormality detecting means for detecting operational abnormality, and in the laser surveying system, the control unit monitors whether there is abnormality or not by the abnormality detecting means, samples a detection signal from each of the detecting means at a predetermined time interval, and stores signal groups thus detected in the storage unit in time series as sampling data, and when the stored sampling data exceeds a predetermined amount, older data are deleted, and new sampling data are sequentially overwritten, and when at least one of the detection signals for monitoring indicates abnormality, using a point to indicate the abnormality as a base point, the sampling data in a range of a predetermined time period are exempted from the objects of deletion and are preserved as data for analysis of the cause of abnormality.

Dependencies are inferred from the claim text.