Patent ID: 8959783
Filing Date: 2015-02-24
Classification: G01C,G01D,Y10S

Abstract:
1. A laser surveying system, comprising a leveling unit having a motor for leveling, a light source unit for emitting a laser beam, a light projecting optical system installed on the leveling unit and for projecting said laser beam, a power supply unit for supplying electric power to each of component sites, a control unit for driving and controlling each of said component sites, a storage unit, a tilt detecting means installed on said leveling unit and used for detecting leveling conditions, a rotation number detecting means for detecting number of rotations of said motor, a light source detecting means for detecting light emitting condition of said light source unit, a voltage detecting means for detecting output voltage of said power source unit, and an abnormality detecting means for detecting operational abnormality, wherein said control unit monitors whether there is abnormality or not by said abnormality detecting means, samples a detection signal from each of said detecting means at a predetermined time interval, and stores signal groups thus detected in said 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.